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CN117811171B - Charging and discharging power distribution method, device, equipment and storage medium of energy storage equipment - Google Patents

Charging and discharging power distribution method, device, equipment and storage medium of energy storage equipment Download PDF

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Publication number
CN117811171B
CN117811171B CN202410224312.4A CN202410224312A CN117811171B CN 117811171 B CN117811171 B CN 117811171B CN 202410224312 A CN202410224312 A CN 202410224312A CN 117811171 B CN117811171 B CN 117811171B
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charge
battery cluster
discharge
discharge power
target
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CN117811171A (en
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崔浩
曾骥
刘刚
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application relates to a charge and discharge power distribution method, a device, equipment and a storage medium of energy storage equipment, wherein the method comprises the following steps: the total charge and discharge power distributed for each battery cluster in the energy storage device is obtained, and the total charge and discharge power is distributed by taking the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the cycle times of each battery cluster as distribution targets, so that sub charge and discharge power distributed by each battery cluster is obtained. Further, each battery cluster is controlled to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster. Therefore, in the embodiment of the application, when each battery cluster is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster is optimal and the circulation times of each battery cluster are balanced, so that the energy storage system can be operated optimally in the overall efficiency and the operation life of the energy storage system can be prolonged.

Description

Charging and discharging power distribution method, device, equipment and storage medium of energy storage equipment
Technical Field
The present application relates to the field of energy storage technologies, and in particular, to a method, an apparatus, a device, and a storage medium for distributing charge and discharge power of an energy storage device.
Background
With the development of new energy technology, energy storage devices for new energy power generation are increasingly widely used. The energy storage device comprises a plurality of battery clusters, and charge-discharge balance of the battery clusters greatly influences normal operation of the energy storage device. Therefore, how to manage charge-discharge balance of a plurality of battery clusters is an important research direction.
In the related art, SOC equalization management of the battery clusters is achieved by depending on the states of charge (State ofcharge, SOC) of the respective battery clusters. The related art has a problem in that the operation life of different battery clusters is not uniform.
Disclosure of Invention
In view of the above problems, the present application provides a method, an apparatus, a device and a storage medium for distributing charge and discharge power of an energy storage device, which can solve the problem of unbalanced service lives of different battery clusters in the related art.
In a first aspect, the present application provides a method for distributing charge and discharge power of an energy storage device, where the method includes: acquiring total charge and discharge power distributed for each battery cluster in energy storage equipment; taking optimal charge and discharge efficiency of each battery cluster of the energy storage device and balance of cycle times of each battery cluster as distribution targets, and distributing the total charge and discharge power to obtain sub charge and discharge power distributed by each battery cluster; and controlling each battery cluster to charge and discharge according to the sub-charge and discharge power distributed by each battery cluster.
In the technical scheme of the embodiment of the application, the total charge and discharge power is distributed by taking the optimal charge and discharge efficiency of each battery cluster and the balance of the circulation times of each battery cluster of the energy storage device as distribution targets, so that the sub charge and discharge power distributed by each battery cluster is obtained, the charge and discharge efficiency of each battery cluster and the balance of the circulation times of each battery cluster can be conveniently ensured when each battery cluster is charged and discharged according to the distributed sub charge and discharge power, and the energy storage system can be conveniently operated with optimal overall efficiency and improved operation life.
In some embodiments, with optimal charge and discharge efficiency of each battery cluster and balanced cycle number of each battery cluster of the energy storage device as allocation targets, allocating the total charge and discharge power to obtain sub-charge and discharge power allocated by each battery cluster, including: dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein, the charge and discharge priorities of different battery cluster groups are different; determining at least one target battery cluster group to be charged and discharged and target charging and discharging power corresponding to each target battery cluster group from at least one battery cluster group according to the total charging and discharging power and the charging and discharging power limit value corresponding to each battery cluster group; and for each target battery cluster group, taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as distribution targets, and distributing the target charge and discharge power corresponding to the target battery cluster group to obtain the sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
According to the technical scheme, at least one target battery cluster group to be charged and discharged and target charge and discharge power corresponding to each target battery cluster group are determined according to the SOC (state of charge) of each battery cluster, the total charge and discharge power and the charge and discharge power limit value corresponding to each battery cluster group, and the charge and discharge efficiency of each battery cluster in each target battery cluster group and the cycle number of each battery cluster are balanced as distribution targets, so that the target charge and discharge power corresponding to each target battery cluster group is distributed, sub charge and discharge power distributed by each battery cluster in each target battery cluster group is obtained, and when each battery cluster in each target battery cluster group to be charged and discharged is charged and discharged according to the distributed sub charge and discharge power, the charge and discharge efficiency of each battery cluster of the energy storage device can be optimized and the cycle number of each battery cluster is balanced, and the power distribution efficiency is improved.
In some embodiments, taking optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and balance of cycle times of each battery cluster as distribution targets, distributing target charge and discharge power corresponding to the target battery cluster group to obtain sub charge and discharge power distributed by each battery cluster in the target battery cluster group, including: acquiring an objective function, wherein the objective function comprises an imbalance part and a charge-discharge power loss part of the historical charge-discharge capacity of each battery cluster in the target battery cluster group; and solving the objective function by taking the minimum value of the objective function as the objective on the basis of a preset limiting condition to obtain sub charge and discharge power distributed by each battery cluster in the objective battery cluster group.
According to the technical scheme provided by the embodiment of the application, the objective function is solved by taking the minimum value of the objective function comprising the unbalance part and the charge and discharge power loss part as the objective function based on the preset limiting condition, so that the sub charge and discharge power distributed by each battery cluster in the objective battery cluster group is obtained, the charge and discharge efficiency of each battery cluster is further optimized, the cycle times of each battery cluster are balanced, and the realization of the optimal operation of the overall efficiency of the energy storage system is further facilitated, and the operation life of the energy storage system can be prolonged.
In some embodiments, obtaining an imbalance portion of historical charge-discharge capacities of each cell cluster in a target group of cell clusters includes: acquiring the imbalance degree of the historical charge and discharge capacities of all the battery clusters in the target battery cluster group according to the historical total charge and discharge capacities of all the battery clusters in the target battery cluster group and the corresponding sub charge and discharge powers; and acquiring an imbalance part according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance degree of the historical charge and discharge capacities of each battery cluster in the target battery cluster group.
In the technical scheme of the embodiment of the application, the imbalance part is related to the imbalance of the historical total charge and discharge capacity of each battery cluster, namely, the imbalance part can be used for representing the balancing condition of the cycle times of each battery cluster, so that the balancing purpose of the cycle times of each battery cluster can be realized by solving the objective function containing the imbalance part.
In some embodiments, acquiring the charge-discharge power loss portion of each cell cluster in the target group of cell clusters includes: according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each battery cluster in the target battery cluster group, the charge-discharge power loss part is obtained, so that the aim of optimizing the charge-discharge efficiency of each battery cluster can be fulfilled by solving the objective function containing the charge-discharge power loss part.
In some embodiments, the preset limit conditions include: a first power limitation condition and a second power limitation condition; the first power limiting condition is that the sum of sub charge and discharge powers corresponding to all battery clusters in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group; the second power limiting condition is that the sub charge and discharge power corresponding to each battery cluster in the target battery cluster group is within a preset sub charge and discharge power limiting range.
In some embodiments, determining at least one target group of battery clusters to be charged and discharged from the at least one group of battery clusters and the target charge and discharge power corresponding to each target group of battery clusters according to the total charge and discharge power and the charge and discharge power limit value corresponding to each group of battery clusters includes: determining a first candidate battery cluster with highest charge-discharge priority from at least one battery cluster group according to the total charge-discharge power; and if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is larger than the absolute value of the total charge-discharge power, grouping the first candidate battery cluster as a target battery cluster, and taking the total charge-discharge power as the target charge-discharge power corresponding to the target battery cluster group.
In some embodiments, determining at least one target group of battery clusters to be charged and discharged and the target charge and discharge power corresponding to each target group of battery clusters from at least one group of battery clusters according to the total charge and discharge power and the charge and discharge power limit value corresponding to each group of battery clusters, further includes: if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge-discharge power, the first candidate battery cluster is used as a first target battery cluster group, and the charge-discharge power limit value corresponding to the first candidate battery cluster is used as the target charge-discharge power corresponding to the first target battery cluster group; determining a second candidate battery cluster with high charge-discharge priority from at least one battery cluster group; if the absolute value of the charge-discharge power limit value corresponding to the second candidate battery cluster is larger than the preset absolute value, grouping the second candidate battery cluster as a second target battery cluster, and taking the difference value of the total charge-discharge power and the charge-discharge power limit value corresponding to the first candidate battery cluster as the target charge-discharge power corresponding to the second target battery cluster group; the preset absolute value is the absolute value of the difference value between the total charge and discharge power and the charge and discharge power limit value corresponding to the first candidate battery cluster.
In some embodiments, dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster includes: and dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.
In some embodiments, dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge-discharge thresholds, comprises: determining a plurality of target charge-discharge thresholds from a plurality of preset charge-discharge thresholds according to the total charge-discharge power; each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of target charge-discharge thresholds.
In some embodiments, obtaining the total charge and discharge power allocated for each battery cluster in the energy storage device comprises: acquiring a power scheduling request value; and determining the total charge-discharge power according to the power scheduling request value and the total power generation power of the power generation equipment.
In some embodiments, controlling each battery cluster to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster includes: and for each battery cluster, sub charge and discharge power corresponding to the battery cluster is sent to the DC/DC corresponding to the battery cluster so as to control the DC/DC and the power grid to charge and discharge.
In a second aspect, the present application provides a charge and discharge power distribution device of an energy storage device, where the device includes: the acquisition module is used for acquiring the total charge and discharge power distributed for each battery cluster in the energy storage equipment; the distribution module is used for distributing the total charge and discharge power by taking optimal charge and discharge efficiency of each battery cluster of the energy storage device and balance of cycle times of each battery cluster as distribution targets so as to obtain sub charge and discharge power distributed by each battery cluster; and the control module is used for controlling each battery cluster to charge and discharge according to the sub-charge and discharge power distributed by each battery cluster.
In a third aspect, the present application provides a charge and discharge power distribution device of an energy storage device, including a memory and a processor, where the memory stores a computer program, and the processor implements steps in an embodiment of a charge and discharge power distribution method of the energy storage device when executing the computer program.
In a fourth aspect, the present application provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of an embodiment of a method for distributing charge and discharge power of an energy storage device as described above.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
fig. 1 is a schematic structural diagram of a charge-discharge power distribution system according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a charge-discharge power distribution system according to a second embodiment of the present application;
Fig. 3 is a flow chart illustrating a method for distributing charge and discharge power of an energy storage device according to some embodiments of the present application;
fig. 4 is a flow chart illustrating a method for distributing charge and discharge power of an energy storage device according to another embodiment of the present application;
fig. 5 is a flow chart illustrating a method for distributing charge and discharge power of an energy storage device according to another embodiment of the present application;
fig. 6 is a flow chart illustrating a method for distributing charge and discharge power of an energy storage device according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a charge-discharge power distribution device according to some embodiments of the present application;
fig. 8 is a schematic structural diagram of a charge-discharge power distribution apparatus according to some embodiments of the present application.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the term "comprising" and any variations thereof in the description of the application and the claims and the description of the figures above is intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more (including two) unless otherwise specifically defined.
The charge and discharge power distribution method, the device, the equipment and the storage medium of the energy storage equipment can be applied to charge and discharge power distribution application scenes of the energy storage equipment under the condition of new energy power generation or conventional energy power generation, for example, charge and discharge power distribution application scenes of industrial energy storage equipment, charge and discharge power distribution application scenes of household energy storage equipment, charge and discharge power distribution application scenes of charging station energy storage equipment and the like.
For convenience of description, the following embodiments take a scenario of charge and discharge power distribution of the energy storage device in the case of new energy power generation as an example. It should be understood that when the charge and discharge power distribution method, apparatus, device and storage medium of the energy storage device according to the embodiments of the present application are applied to other scenarios, the implementation principle and technical effects are similar.
By way of example, the new energy generation in embodiments of the present application may include, but is not limited to, photovoltaic generation and/or wind generation. For convenience of explanation, the following embodiments of the present application will be described by taking new energy power generation including photovoltaic power generation as an example.
Typically, the energy storage device includes a plurality of battery clusters, and charge-discharge balance of the plurality of battery clusters has a great influence on normal operation of the energy storage device. Therefore, how to manage charge-discharge balance of a plurality of battery clusters is an important research direction.
In the related art, SOC equalization management of the battery clusters is achieved by depending on the SOC of each battery cluster. However, the related art has the problem of unbalanced service lives of different battery clusters, and may have the condition that the service lives of part of the battery clusters are exhausted earlier, so that the energy storage system cannot operate normally.
In order to solve the problem of unbalanced service lives of different battery clusters in the related art, the embodiment of the application proposes a mode of distributing the total charge and discharge power by taking optimal charge and discharge efficiency of each battery cluster and balanced cycle times of each battery cluster of the energy storage device as distribution targets so as to obtain sub charge and discharge power distributed by each battery cluster, so that the charge and discharge efficiency of each battery cluster can be optimal and the cycle times of each battery cluster are balanced when each battery cluster is charged and discharged according to the distributed sub charge and discharge power, and the application is beneficial to realizing the optimal operation of the whole efficiency of the energy storage system and improving the service life of the energy storage system.
Fig. 1 is a schematic structural diagram of a charge-discharge power distribution system according to an embodiment of the present application, as shown in fig. 1, the charge-discharge power distribution system according to an embodiment of the present application may include, but is not limited to: a plurality of power generation devices 10, a charge-discharge power distribution device 11, an energy storage device 12, and a power grid 13. The energy storage device 12 may include, but is not limited to, a plurality of battery clusters (or referred to as stacks) 120, and each battery cluster 120 may include a plurality of connected battery packs (or referred to as stacks).
The charge and discharge power distribution device 11 in the embodiment of the present application may control the charge and discharge of the energy storage device 12 by using the charge and discharge power distribution method of the energy storage device provided in the embodiment of the present application. It should be appreciated that with the energy storage device 12 in a charged state, the energy storage device 12 may be used to store electrical energy generated by the power generation device 10. With the energy storage device 12 in a discharged state, the energy storage device 12 may be used to discharge the electrical energy stored by the energy storage device 12 to the electrical grid 13.
Fig. 2 is a schematic diagram of a second structure of a charge-discharge power distribution system according to an embodiment of the present application, as shown in fig. 2, the charge-discharge power distribution system according to an embodiment of the present application may include, but is not limited to: a plurality of photovoltaic power generation devices 20, an energy storage converter (Power Conversion System, PCS) 21, an energy storage device 22, a transformer (Transfer) 23, and a Grid (Grid) 24. It should be understood that the charge-discharge power distribution system in the embodiment of the present application may also be referred to as an optical storage dc-coupled system.
The PCS 21 may control the charging and discharging processes of the energy storage device 22 to perform ac-dc conversion. Illustratively, PCS 21 may include, but is not limited to: a Local energy management system (Local-ENERGY MANAGEMENT SYSTEM, L-EMS) 210, maximum power point tracking (Maximum Power Point Tracking, MPPT) 211, and a DC-to-AC converter (DC/AC) 212. The MPPT 211 may adjust the operating point of the photovoltaic power generation device, and always make the photovoltaic power generation device output the maximum power. It should be understood that MPPT 211 in the embodiment of the present application may also be disposed between photovoltaic power generation apparatus 20 and PCS 21 independently of PCS 21.
It should be noted that the charge and discharge power distribution device in the embodiment of the present application may include, but is not limited to, the local energy management system 210 in the energy storage converter 21. The local energy management system 210 in the embodiment of the present application may control the energy storage device 22 to charge and discharge by adopting the charge and discharge power distribution method of the energy storage device provided in the embodiment of the present application.
The transformer 23 may be used to convert and transmit the electrical energy of the energy storage device 22 and/or the photovoltaic power generation device 20 to the grid 24.
The energy storage device 22 may include, but is not limited to, a plurality of battery clusters (or referred to as Rack) 220, where each battery cluster 220 may be connected to the energy storage converter 21 through a corresponding DC-to-DC converter (DC/DC) 221. It should be appreciated that each battery cluster 220 and corresponding DC/DC 221 may be separately disposed in a corresponding electrical cabinet, or that a plurality of battery clusters 220 and corresponding DC/DC 221 may be co-disposed in the same electrical cabinet.
In some embodiments, fig. 3 is a flow chart of a charge-discharge power distribution method of an energy storage device according to some embodiments of the present application, and in the embodiments of the present application, an example of application of the method to the charge-discharge power distribution device is described. As shown in fig. 3, the method according to the embodiment of the present application may include the following steps:
Step S301, obtaining the total charge and discharge power allocated to each battery cluster in the energy storage device.
In this step, the charge-discharge power distribution device may obtain the total charge-discharge power distributed for each battery cluster in the energy storage device. It should be understood that the total charge-discharge power in the embodiments of the present application may be positive, negative, or zero. Under the condition that the total charge and discharge power is positive, the energy storage equipment needs to be discharged; under the condition that the total charge and discharge power is negative, the energy storage equipment needs to be charged; and under the condition that the total charge and discharge power is zero, the energy storage equipment does not need to be charged and discharged.
In one possible implementation, a power scheduling request value is obtained, and a total charge-discharge power is determined based on the power scheduling request value and a total generated power of the power generation device.
The power schedule request value in the embodiment of the application can be used for indicating the active power value of the requested schedule.
In this implementation manner, the charge-discharge power distribution device may acquire a power scheduling request value from the scheduling device (or referred to as a station-side EMS), and use a difference between the power scheduling request value and a total generated power of the power generation devices (for example, each photovoltaic power generation device in fig. 2) in the charge-discharge power distribution system as the total charge-discharge power.
It should be understood that, in the charge-discharge power distribution method of the energy storage device provided by the embodiment of the present application, the charge-discharge power distribution method is applied to the application scenario of charge-discharge power distribution of the energy storage device in the electric equipment, that is, in the case that the charge-discharge power distribution system does not include the power generation device, the charge-discharge power distribution device may use the power scheduling request value as the total charge-discharge power.
In another possible implementation, the charge-discharge power distribution device may obtain the total charge-discharge power from the scheduling device.
Of course, the charge-discharge power distribution apparatus may acquire the total charge-discharge power in other manners.
And step S302, the total charge and discharge power is distributed by taking optimal charge and discharge efficiency of each battery cluster of the energy storage device and balance of cycle times of each battery cluster as distribution targets, so as to obtain sub charge and discharge power distributed by each battery cluster.
The cycle number of the battery cluster according to the embodiment of the present application may refer to the number of life cycles (or simply referred to as cycle number) that the battery cluster has been used.
In this step, the charge-discharge power distribution device may optimize the charge-discharge efficiency of each battery cluster of the energy storage device and equalize the cycle number of each battery cluster as a distribution target, and distribute the total charge-discharge power to obtain sub charge-discharge power distributed by each battery cluster, so that each battery cluster may optimize the charge-discharge efficiency of each battery cluster and equalize the cycle number of each battery cluster (or referred to as historical charge-discharge capacity) when charging and discharging according to the distributed sub charge-discharge power, which is beneficial to realizing the overall efficiency optimal operation of the energy storage system and improving the operation life of the energy storage system, thereby maximizing the economic benefit of the energy storage system.
It should be understood that the sub-charge-discharge power allocated by any of the battery clusters in the embodiments of the present application may include, but is not limited to, a positive number, a negative number, or zero. Wherein, the sub charge and discharge power distributed in any battery cluster is positive, then the battery cluster needs to be discharged; if the sub charge and discharge power allocated to any battery cluster is negative, the battery cluster needs to be charged; if the sub charge and discharge power allocated to any battery cluster is zero, the battery cluster does not need to be charged and discharged.
In one possible implementation manner, the charge-discharge power distribution device may divide each battery cluster of the energy storage device into a plurality of battery cluster groups, and determine at least one target battery cluster group that needs to be charged and discharged from the plurality of battery cluster groups. Further, the charge-discharge power distribution device may distribute the total charge-discharge power by using the optimal charge-discharge efficiency of each battery cluster in each target battery cluster group and the balance of the cycle times of each battery cluster as distribution targets, so as to obtain sub charge-discharge power distributed by each battery cluster in each target battery cluster group.
Therefore, in the implementation manner, the charge-discharge power distribution device is capable of improving the charge-discharge power distribution efficiency and improving the service life of each battery cluster in the energy storage system by only distributing each battery cluster in the screened target battery cluster group.
In another possible implementation manner, the charge-discharge power distribution device may consider each battery cluster of the energy storage device as a battery cluster group, directly take the optimal charge-discharge efficiency of each battery cluster and the balance of the cycle times of each battery cluster as the distribution target, and distribute the total charge-discharge power to obtain the sub charge-discharge power distributed by each battery cluster.
Of course, with optimal charge and discharge efficiency of each battery cluster of the energy storage device and balanced cycle times of each battery cluster as distribution targets, the charge and discharge power distribution device may also distribute the total charge and discharge power in other manners.
Step S303, controlling each battery cluster to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster.
In this step, the charge/discharge power distribution device may control each of the battery clusters to perform charge/discharge according to the allocated sub-charge/discharge power according to the sub-charge/discharge power allocated to each of the battery clusters. It should be understood that if the sub charge-discharge power allocated to any battery cluster is a positive number, the charge-discharge power allocation apparatus may control the battery cluster to discharge according to the sub charge-discharge power; if the sub charge and discharge power allocated to any battery cluster is negative, the charge and discharge power allocation device can control the battery cluster to charge according to the sub charge and discharge power; if the sub charge and discharge power allocated to any battery cluster is zero, the charge and discharge power allocation device can control the battery cluster to be free from charge and discharge.
In one possible implementation manner, for each battery cluster, sub charge-discharge power corresponding to the battery cluster is sent to DC/DC corresponding to the battery cluster, so as to control the DC/DC to charge and discharge with the power grid.
In this implementation manner, when each battery cluster is connected to the charge/discharge power distribution device through the corresponding DC/DC, the charge/discharge power distribution device may send, for each battery cluster, sub charge/discharge power corresponding to the battery cluster to the DC/DC corresponding to the battery cluster, so as to control the DC/DC to charge/discharge with the power grid according to the sub charge/discharge power.
Therefore, in the implementation manner, the charge-discharge power distribution device respectively sends the sub charge-discharge power corresponding to each battery cluster to the corresponding DC/DC of each battery cluster so as to control the charge-discharge mode of each DC/DC and the power grid, so that the independent charge-discharge control of each battery cluster can be realized, the charge-discharge control efficiency is improved, and the running stability of each battery cluster is improved.
In another possible implementation manner, for each battery cluster, the sub charge and discharge power corresponding to the battery cluster is sent to a Battery Management System (BMS) corresponding to the battery cluster, so as to control the BMS to charge and discharge with the power grid.
In this implementation manner, for each battery cluster, the charging and discharging power distribution device may send the sub-charging and discharging power corresponding to the battery cluster to the BMS corresponding to the battery cluster, so as to control the BMS to charge and discharge according to the sub-charging and discharging power and the power grid.
Therefore, the charge and discharge power distribution equipment can realize independent charge and discharge control of each battery cluster by respectively sending sub charge and discharge power corresponding to each battery cluster to the BMS corresponding to each battery cluster so as to control the charge and discharge mode of each BMS and the power grid, thereby being beneficial to improving the charge and discharge control efficiency.
Of course, the charge-discharge power distribution device may also control each battery cluster to charge and discharge according to the sub-charge-discharge power distributed by each battery cluster in other manners.
In summary, in the embodiment of the application, the total charge and discharge power is distributed by acquiring the total charge and discharge power distributed for each battery cluster in the energy storage device and taking the optimal charge and discharge efficiency of each battery cluster and the balance of the cycle times of each battery cluster of the energy storage device as distribution targets, so as to obtain the sub charge and discharge power distributed by each battery cluster. Further, each battery cluster is controlled to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster. Therefore, compared with the mode of realizing the SOC balance management of the battery clusters according to the SOC of each battery cluster in the related art, in the embodiment of the application, the total charge and discharge power is distributed by taking the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the cycle times of each battery cluster as distribution targets, so that the sub charge and discharge power distributed by each battery cluster is obtained, and the charge and discharge efficiency of each battery cluster and the balance of the cycle times of each battery cluster can be optimized when each battery cluster is charged and discharged according to the distributed sub charge and discharge power, thereby being beneficial to realizing the optimal operation of the overall efficiency of the energy storage system and improving the service life of the energy storage system.
In some embodiments, fig. 4 is a schematic flow chart of a charge-discharge power distribution method of an energy storage device according to another embodiment of the present application, and on the basis of the foregoing embodiments, the embodiments of the present application describe exemplary descriptions of the related contents of "taking the charge-discharge efficiency of each battery cluster of the energy storage device and the cycle number balance of each battery cluster as the distribution target, and distributing the total charge-discharge power to obtain sub-charge-discharge power distributed by each battery cluster" in the foregoing step S302. As shown in fig. 4, the step S302 may include the following steps:
step S3021, dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein, the charge and discharge priorities of different battery cluster groups are different.
In the step, the charge-discharge power distribution device may divide each battery cluster of the energy storage device into at least one battery cluster group by comparing the SOC of each battery cluster with a plurality of preset charge-discharge thresholds or a plurality of preset charge-discharge ranges; wherein, the charge and discharge priorities of different battery cluster groups are different.
In one possible implementation, each battery cluster is divided into at least one group of battery clusters according to the SOC of each battery cluster and a plurality of preset charge-discharge thresholds.
Illustratively, the plurality of preset charge-discharge thresholds in the embodiments of the present application may include, but are not limited to, at least one of the following thresholds: the non-dischargeable threshold soc_not_allowances_ disch, the priority discharge threshold soc_pre_ disch, the priority charge threshold soc_pre_chrg, and the non-chargeable threshold soc_not_allowances_chrg, which become larger in order. For example, the non-dischargeable threshold soc_not_alloy_ disch may be 5%, the priority discharge threshold soc_pre_ disch may be 20%, the priority charge threshold soc_pre_chrg may be 80%, and the non-chargeable threshold soc_not_alloy_chrg may be 100%.
In this implementation manner, the charge-discharge power distribution device may divide each battery cluster into at least one group of battery clusters by comparing the SOC of each battery cluster with a plurality of preset charge-discharge thresholds.
For easy understanding, the following embodiments of the present application include: the non-dischargeable threshold value soc_not_alloy_ disch, the priority discharge threshold value soc_pre_ disch, the priority charge threshold value soc_pre_chrg, and the non-chargeable threshold value soc_not_alloy_chrg are exemplified, and the description is given of the exemplary description of the division of each battery cluster into at least one battery cluster group.
As an example, the charge-discharge power distribution device may divide each battery cluster in the energy storage device having an SOC equal to or less than the non-dischargeable threshold value soc_not_alloy_ disch into a priority-charge and non-discharge battery cluster group, divide each battery cluster in the energy storage device having an SOC greater than the non-dischargeable threshold value soc_not_alloy_ disch and equal to or less than the priority-discharge threshold value soc_pre_ disch into a priority-charge and sub-priority-discharge battery cluster group, divide each battery cluster in the energy storage device having an SOC greater than the priority-discharge threshold value soc_pre_ disch and equal to or less than the priority-charge threshold value soc_pre_chrg into a priority-charge and non-charge battery cluster group, divide each battery cluster in the energy storage device having an SOC greater than the priority-charge threshold value soc_pre_chrg and equal to or less than the non-charge threshold value soc_non-alloy_chrg into a priority-discharge and sub-priority-charge battery cluster group, and divide each battery cluster in the energy storage device having an SOC greater than the non-charge threshold value soc_non-charge_alloy_chrg.
Therefore, in the implementation manner, each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds, so that each battery cluster with the SOC meeting different charge and discharge threshold ranges can be divided into the same battery cluster group, and the charge and discharge priorities of different battery cluster groups are different, so that power distribution can be conveniently carried out according to the battery cluster groups in the follow-up process, the accuracy of power distribution can be improved, and the overall efficiency and the operation life of the energy storage system can be further improved.
Further, considering the difference of the charge condition and the discharge condition, determining a plurality of target charge-discharge thresholds from a plurality of preset charge-discharge thresholds according to the total charge-discharge power, and dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and the plurality of target charge-discharge thresholds.
Illustratively, the plurality of target charge-discharge thresholds in embodiments of the present application may include, but are not limited to: non-dischargeable threshold soc_not_alloy_ disch and priority discharge threshold soc_pre_ disch; or a priority charge threshold value soc_pre_chrg and a non-chargeable threshold value soc_not_alloy_chrg.
In the embodiment of the application, the charge-discharge power distribution equipment can determine a plurality of target charge-discharge thresholds from a plurality of preset charge-discharge thresholds according to the positive and negative of the total charge-discharge power. For example, if the total charge-discharge power is a positive number, the charge-discharge power distribution apparatus may determine a plurality of target charge-discharge thresholds related to discharge, such as the non-dischargeable threshold soc_not_alloy_ disch and the priority discharge threshold soc_pre_ disch, from among a plurality of preset charge-discharge thresholds. As yet another example, if the total charge-discharge power is negative, the charge-discharge power distribution apparatus may determine a plurality of target charge-discharge thresholds related to the charge, such as a priority charge threshold value soc_pre_chrg and a non-chargeable threshold value soc_non_alloy_chrg, among a plurality of preset charge-discharge thresholds.
Further, the charge-discharge power distribution apparatus may divide each of the battery clusters into at least one group of battery clusters by comparing the SOC of each of the battery clusters with a plurality of target charge-discharge thresholds.
For ease of understanding, in the following embodiments of the present application, the description will be given by way of example of the discharging scenario, and the plurality of target charging/discharging thresholds include the non-dischargeable threshold soc_not_alloy_ disch and the priority discharging threshold soc_pre_ disch, which are related to dividing each battery cluster into at least one battery cluster group.
For example, the charge-discharge power distribution device may divide each battery cluster having an SOC of equal to or less than the non-dischargeable threshold soc_not_alloy_ disch in the energy storage device into non-discharge battery cluster groups, divide each battery cluster having an SOC of greater than the non-dischargeable threshold soc_not_alloy_ disch and equal to or less than the priority discharge threshold soc_pre_ disch in the energy storage device into sub-priority discharge battery cluster groups, and divide each battery cluster having an SOC of greater than the priority discharge threshold soc_pre_ disch in the energy storage device into priority discharge battery cluster groups.
Therefore, in the implementation manner, the battery clusters are divided into at least one battery cluster group by determining the target charge-discharge threshold values from the preset charge-discharge threshold values and the SOC of each battery cluster according to the total charge-discharge power, so that each battery cluster can be divided into the required battery cluster groups, power distribution can be carried out according to the battery cluster groups, and the power distribution efficiency can be improved.
In another possible implementation manner, each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge-discharge ranges.
Illustratively, the plurality of preset charge-discharge ranges in the embodiments of the present application may include, but are not limited to, at least one of the following ranges: preferential charge and no discharge range, preferential charge and less preferential discharge range, preferential charge and discharge range, preferential discharge and less preferential charge range, preferential discharge and no charge range. It should be understood that each preset charge-discharge range includes a corresponding SOC upper and lower limit threshold, respectively.
In this implementation manner, the charge-discharge power distribution device may divide each battery cluster having an SOC that belongs to the same preset charge-discharge range into one group of battery clusters by comparing the SOC of each battery cluster with a plurality of preset charge-discharge ranges.
Of course, the charge-discharge power distribution apparatus may divide each battery cluster into at least one group of battery clusters by other means.
Step S3022, determining at least one target group of battery clusters to be charged and discharged and the target charging and discharging power corresponding to each target group of battery clusters from the at least one group of battery clusters according to the total charging and discharging power and the charging and discharging power limit value corresponding to each group of battery clusters.
Illustratively, the charge-discharge power limit value corresponding to any battery cluster group in the embodiment of the present application may be used to indicate the sum of the sub-charge-discharge power limit values corresponding to each battery cluster in the battery cluster group. It should be appreciated that in a discharge scenario, the charge-discharge power limit value corresponding to any group of battery clusters may be used to indicate the sum of the sub-discharge power limit values corresponding to each of the battery clusters in the group of battery clusters; in a charging scenario, the charge-discharge power limit corresponding to any group of battery clusters may be used to indicate the sum of the sub-charge power limits corresponding to each of the battery clusters in the group of battery clusters.
It should be noted that, in a discharging scenario, a sub-discharging power limit or a charging-discharging power limit in the embodiment of the present application may be a positive number; in a charging scenario, the sub-charging power limit or the charging/discharging power limit referred to in the embodiments of the present application may be a negative number.
In this step, the charge-discharge power distribution device may determine, from at least one group of battery clusters, at least one target group of battery clusters that needs to be charged and discharged, and target charge-discharge powers corresponding to each target group of battery clusters, according to the positive and negative of the total charge-discharge power and the charge-discharge power limit value corresponding to each group of battery clusters.
For example, if the total charge and discharge power is a positive number, the charge and discharge power distribution device may determine at least one target group of battery clusters that needs to be discharged and a target discharge power corresponding to each target group of battery clusters from at least one group of battery clusters according to the total charge and discharge power and a charge and discharge power limit corresponding to each group of battery clusters (which is used to indicate a sum of sub-discharge power limits corresponding to each battery cluster in the group of battery clusters).
Still further exemplary, if the total charge and discharge power is a negative number, the charge and discharge power distribution apparatus may determine at least one target group of battery clusters to be charged from at least one group of battery clusters, and a target charge power corresponding to each target group of battery clusters, from the total charge and discharge power and a charge and discharge power limit corresponding to each group of battery clusters (for indicating a sum of sub-charge power limits corresponding to each battery cluster in the group of battery clusters).
In a possible implementation manner, the charge-discharge power distribution device may determine, according to the positive and negative of the total charge-discharge power and the charge-discharge power limit value corresponding to each battery cluster group, at least one target battery cluster group that needs to be charged and discharged from at least one battery cluster group according to the order of the charge-discharge priority from high to low, and the target charge-discharge power corresponding to each target battery cluster group.
In this implementation manner, the charge-discharge power distribution device may determine, from at least one group of battery clusters, a first candidate battery cluster with a highest charge-discharge priority according to the total charge-discharge power.
For example, if the total charge and discharge power is a positive number, the charge and discharge power distribution device may determine a first candidate battery cluster having the highest discharge priority from among at least one battery cluster group. Still further, for example, if the total charge-discharge power is negative, the charge-discharge power distribution apparatus may determine a first candidate battery cluster having the highest charge priority from among the at least one battery cluster group.
Further, if the absolute value of the charge-discharge power limit corresponding to the first candidate battery cluster is greater than the absolute value of the total charge-discharge power (i.e., the total discharge power can be satisfied by charging and discharging the first candidate battery cluster), the first candidate battery cluster is used as the target battery cluster group, and the total charge-discharge power is used as the target charge-discharge power corresponding to the target battery cluster group.
For example, if the total charge and discharge power is a positive number, the charge and discharge power limit value corresponding to the first candidate battery cluster (which is used to indicate the sum of the sub-discharge power limit values corresponding to the battery clusters in the battery cluster group) is greater than the total charge and discharge power, the charge and discharge power distribution device may group the first candidate battery cluster as the target battery cluster to be discharged, and use the total charge and discharge power as the target discharge power corresponding to the target battery cluster group.
Still further exemplary, if the total charge-discharge power is a negative number, the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster (which is used to indicate the sum of the sub-charge power limit values corresponding to the respective battery clusters in the battery cluster group) is greater than the absolute value of the total charge-discharge power, the charge-discharge power distribution apparatus may group the first candidate battery cluster as the target battery cluster to be charged and the total charge-discharge power as the target charge power corresponding to the target battery cluster group.
Further, if the absolute value of the charge-discharge power limit corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge-discharge power (i.e., the total discharge power cannot be satisfied by charging and discharging the first candidate battery cluster), the first candidate battery cluster is taken as the first target battery cluster group, and the charge-discharge power limit corresponding to the first candidate battery cluster is taken as the target charge-discharge power corresponding to the first target battery cluster group.
Further, determining a second candidate battery cluster with a high charge-discharge priority from at least one battery cluster group; if the absolute value of the charge-discharge power limit value corresponding to the second candidate battery cluster is larger than the first preset absolute value, grouping the second candidate battery cluster as a second target battery cluster, and taking the difference value of the total charge-discharge power and the charge-discharge power limit value corresponding to the first candidate battery cluster as the target charge-discharge power corresponding to the second target battery cluster group; the first preset absolute value is an absolute value of a difference value between the total charge and discharge power and a charge and discharge power limit value corresponding to the first candidate battery cluster (i.e., the total discharge power can be satisfied by charging and discharging the first candidate battery cluster and the second candidate battery cluster).
For example, if the total charge-discharge power is a positive number, the charge-discharge power distribution device may determine a second candidate battery cluster having a higher discharge priority from among the at least one battery cluster group. As yet another example, if the total charge-discharge power is negative, the charge-discharge power distribution device may determine the second candidate battery cluster having the next highest charge priority from among the at least one battery cluster group.
It should be noted that, if the absolute value of the charge-discharge power limit value corresponding to the second candidate battery cluster is still not greater than the first preset absolute value (i.e., the total discharge power cannot be satisfied by charging and discharging the first candidate battery cluster and the second candidate battery cluster), then the third candidate battery cluster with the highest charge-discharge priority needs to be determined from at least one battery cluster group. If the absolute value of the charge-discharge power limit value corresponding to the third candidate battery cluster is greater than a second preset absolute value (the second preset absolute value is the absolute value of the difference between the total charge-discharge power and the charge-discharge power limit values corresponding to the first candidate battery cluster and the first candidate battery cluster respectively, that is, the total discharge power can be satisfied by charging and discharging the first candidate battery cluster, the second candidate battery cluster and the third candidate battery cluster), the third candidate battery cluster is used as a third target battery cluster group, and the difference between the total charge-discharge power and the charge-discharge power limit values corresponding to the first candidate battery cluster and the first candidate battery cluster respectively is used as the target charge-discharge power corresponding to the third target battery cluster group. The charge-discharge priority of the first candidate battery cluster is higher than that of the second candidate battery cluster, and the charge-discharge priority of the second candidate battery cluster is higher than that of the third candidate battery cluster.
Therefore, in the implementation manner, the charge-discharge power distribution device screens each target battery cluster group to be charged and discharged and the target charge-discharge power corresponding to each target battery cluster group from at least one battery cluster group according to the total charge-discharge power and the charge-discharge power limit value corresponding to each battery cluster group and the order of the charge-discharge priority from high to low, so that the charge-discharge of each target battery cluster to be charged and discharged can be preferentially realized, and the balance of the cycle times of each battery cluster of the energy storage device is further improved.
In another possible implementation manner, the charge-discharge power distribution device may determine, according to the total charge-discharge power and the charge-discharge power limit value corresponding to each battery cluster group, at least one target battery cluster group that needs to be charged and discharged from at least one battery cluster group according to the order of the SOCs of each battery cluster group from large to small or from small to large, and the target charge-discharge power corresponding to each target battery cluster group.
Of course, the charge-discharge power distribution device may also determine, according to the total charge-discharge power and the charge-discharge power limit value corresponding to each group of battery clusters, at least one target group of battery clusters that needs to be charged and discharged and the target charge-discharge power corresponding to each target group of battery clusters from at least one group of battery clusters in other manners.
Step S3023, for each target battery cluster group, taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as the allocation targets, and allocating the target charge and discharge power corresponding to the target battery cluster group to obtain the sub charge and discharge power allocated to each battery cluster in the target battery cluster group.
In this step, for each target battery cluster group, the charge-discharge power distribution device may establish a charge-discharge power distribution model for the distribution target by optimizing charge-discharge efficiency of each battery cluster in the target battery cluster group and balancing cycle times of each battery cluster, and may implement distribution of target charge-discharge power corresponding to the target battery cluster group by solving the charge-discharge power distribution model, so as to obtain sub charge-discharge power allocated to each battery cluster in the target battery cluster group, so that each battery cluster in the target battery cluster group may optimize charge-discharge efficiency of each battery cluster of the energy storage device and balancing cycle times of each battery cluster when charging and discharging according to the allocated sub charge-discharge power.
In a possible implementation manner, the charge-discharge power distribution model in the embodiment of the present application may be a machine learning model, where an input of the charge-discharge power distribution model may include, but is not limited to, total charge-discharge power, and an output of the charge-discharge power distribution model may include, but is not limited to, sub-charge-discharge power allocated by each battery cluster.
In another possible implementation manner, the charge-discharge power distribution model in the embodiment of the present application may be a mathematical model of an optimization problem, where the charge-discharge power distribution model may include, but is not limited to, an objective function and a preset constraint (or referred to as a preset constraint).
The charge-discharge power distribution device may implement distribution of the target charge-discharge power corresponding to the target battery cluster group by solving the charge-discharge power distribution model by using an optimization algorithm, so as to obtain sub-charge-discharge powers distributed by each battery cluster in the target battery cluster group. Wherein the optimization algorithm may include, but is not limited to, any of the following: genetic algorithm, annealing algorithm, particle swarm algorithm.
In summary, in the embodiment of the present application, at least one target battery cluster group to be charged and discharged and a target charge and discharge power corresponding to each target battery cluster group are determined according to the SOC, the total charge and discharge power of each battery cluster, and the charge and discharge efficiency of each battery cluster in each target battery cluster group and the cycle number of each battery cluster are balanced as distribution targets, and the target charge and discharge powers corresponding to each target battery cluster group are respectively distributed, so as to obtain sub charge and discharge powers distributed by each battery cluster in each target battery cluster group, so that when each battery cluster in each target battery cluster group to be charged and discharged is charged and discharged according to the distributed sub charge and discharge power, not only can charge and discharge efficiency of each battery cluster of an energy storage device be optimal and cycle number of each battery cluster be balanced, but also power distribution efficiency can be improved.
In some embodiments, fig. 5 is a schematic flow chart of a charge-discharge power distribution method of an energy storage device according to another embodiment of the present application, and on the basis of the foregoing embodiments, in the embodiment of the present application, the relevant content of "charge-discharge efficiency optimization of each battery cluster and cycle number balancing of each battery cluster in the target battery cluster group and each battery cluster are used as distribution targets, and the target charge-discharge power corresponding to the target battery cluster group is distributed, so as to obtain sub charge-discharge power distributed by each battery cluster in the target battery cluster group" in the step S3023 is described as an example. As shown in fig. 5, the step S3023 may include the steps of:
step S501, an objective function is obtained, where the objective function includes an imbalance portion of historical charge and discharge capacities and a charge and discharge power loss portion of each battery cluster in the target battery cluster group.
Illustratively, the imbalance degree part of the historical charge and discharge capacities of each battery cluster in the target battery cluster group in the embodiment of the application can be used for indicating the imbalance total cost corresponding to the imbalance degree of the historical charge and discharge capacities of each battery cluster in the target battery cluster group. The imbalance of the historical charge and discharge capacities of the battery clusters means that the capacities of the battery clusters are different due to different service lives of the battery clusters, and the imbalance can be used for quantifying parameters of different capacities among the battery clusters.
The historical charge-discharge capacity of any battery cluster is positively correlated with the cycle number of the battery cluster, namely, the greater the historical charge-discharge capacity of the battery cluster is, the greater the cycle number of the battery cluster is.
Illustratively, the charge-discharge power loss portion of each battery cluster in the target battery cluster group in the embodiment of the present application may be used to indicate a total loss cost corresponding to the charge-discharge power loss of each battery cluster in the target battery cluster group. The charge and discharge power loss of each battery cluster refers to electric quantity loss existing in the energy conversion process of each battery cluster under the charge and discharge condition.
In this step, the charge-discharge power distribution apparatus may acquire the imbalance portion and the charge-discharge power loss portion of the historic charge-discharge capacities of the respective battery clusters in the target battery cluster group. Further, the charge-discharge power distribution device may obtain an objective function according to the imbalance portion and the charge-discharge power loss portion, where the objective function includes both the imbalance portion and the charge-discharge power loss portion, that is, the objective function may be used to indicate an equalization condition and a charge-discharge efficiency condition of the cycle number of each battery cluster, so that by solving the objective function, the purposes of balancing the cycle number of each battery cluster and optimizing the charge-discharge efficiency may be achieved.
In the following embodiments of the present application, an exemplary description will be given of the manner in which the imbalance portion of the historical charge-discharge capacity is obtained.
Optionally, according to the historical total charge-discharge capacity and the corresponding sub charge-discharge power of each battery cluster in the target battery cluster group, obtaining the imbalance degree of the historical charge-discharge capacity of each battery cluster in the target battery cluster group; and acquiring an imbalance part according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance degree of the historical charge and discharge capacities of each battery cluster in the target battery cluster group.
Illustratively, the historical total charge-discharge capacity of the battery cluster in the embodiments of the present application may include, but is not limited to, the historical total charge-discharge capacity of the battery cluster and the historical total discharge capacity of the battery cluster.
In the embodiment of the application, for each battery cluster in the target battery cluster group, the charge-discharge power distribution device can determine the initial total charge-discharge capacity of the battery cluster according to the historical total charge-discharge capacity of the battery cluster by the following formula (1).
Formula (1)
Wherein,Representing the initial total charge-discharge capacity of the battery cluster i in the target battery cluster group; cap dischi represents the historical total discharge capacity of the cell cluster i in the target cell cluster group; cap chrgi represents the historical total charge capacity of the battery cluster i in the target battery cluster group.
Of course, the charge-discharge power distribution device may also determine the initial total charge-discharge capacity of the battery cluster according to the historical total charge-discharge capacity of the battery cluster by other variations of the above formula (1) or an equivalent formula.
Further, the charge-discharge power distribution device obtains the imbalance degree of the historical charge-discharge capacity of each battery cluster in the target battery cluster group according to the initial total charge-discharge capacity of each battery cluster in the target battery cluster group and the corresponding sub charge-discharge power.
Illustratively, for each battery cluster in the target battery cluster group, the charge-discharge power distribution apparatus may obtain the imbalance of the historical charge-discharge capacities of the battery cluster by the following formula (2) according to the initial total charge-discharge capacity and the corresponding sub charge-discharge power of the battery cluster.
Formula (2)
Wherein,Representing the imbalance of the historical charge and discharge capacities of the battery clusters i in the target battery cluster group; n represents the total number of battery clusters in the target cluster group; cap j represents the historical total charge-discharge capacity variation of the battery cluster j in the target battery cluster group; cap i represents the historical total charge-discharge capacity variation of the battery cluster i in the target battery cluster group; Representing the initial total charge-discharge capacity of the battery cluster j in the target battery cluster group; p j represents the sub-charge-discharge power corresponding to the battery cluster j in the target battery cluster group; p i represents the sub-charge-discharge power corresponding to the battery cluster i in the target battery cluster group; Representing an efficiency function corresponding to the operating power; t represents the power allocation calculation period.
Note that, the sub charge/discharge power corresponding to each battery cluster in the above formula (2) is an unknown number, and it is necessary to obtain an optimal sub charge/discharge power by solving an objective function. In the case where each battery cluster is connected to the charge-discharge power distribution device through the corresponding DC/DC, the above formula (2)The efficiency function corresponding to each power of the DC/DC in operation can be obtained through fitting efficiency test data of the DC/DC in factory.
Of course, the charge-discharge power distribution device may also obtain the imbalance of the historical charge-discharge capacity of the battery cluster according to the initial total charge-discharge capacity of the battery cluster and the corresponding sub charge-discharge power through other variations of the above formula (2) or an equivalent formula.
Further, the charge-discharge power distribution apparatus may obtain the imbalance of the historical charge-discharge capacities of each of the battery clusters in the target battery cluster group according to the energy storage system cost corresponding to the unit charge-discharge capacity and the imbalance of the historical charge-discharge capacities of each of the battery clusters in the target battery cluster group by the following formula (3).
Formula (3)
Wherein Cap dise represents an imbalance portion of the historical charge-discharge capacities of each battery cluster in the target battery cluster group; cess represents the cost of the energy storage system corresponding to the unit charge and discharge capacity.
Of course, the charge-discharge power distribution device may also obtain the imbalance of the historical charge-discharge capacities of each battery cluster in the target battery cluster group according to the cost of the energy storage system corresponding to the unit charge-discharge capacity and the imbalance of the historical charge-discharge capacities of each battery cluster in the target battery cluster group by other variations of the above formula (3) or an equivalent formula.
It should be noted that, the cost of the energy storage system corresponding to the unit charge and discharge capacity in the embodiment of the present application may be determined by the charge and discharge power distribution device according to the preset cost of the energy storage system, the preset capacity of the single cell cluster, and the preset cycle number of the single cell cluster.
Illustratively, the charge-discharge power distribution apparatus may determine the energy storage system cost corresponding to the unit charge-discharge capacity through the following formula (4) according to a preset energy storage system cost, a preset cell cluster capacity, and a preset cell cluster cycle number.
Formula (4)
Wherein, call ess represents a preset energy storage system cost; cap pack represents a preset cell cluster capacity; num cycle represents the preset number of cell cluster cycles; n all represents the total number of individual battery clusters in the energy storage device.
Of course, the charge-discharge power distribution device may also determine the cost of the energy storage system corresponding to the unit charge-discharge capacity according to the preset cost of the energy storage system, the preset capacity of the single cell cluster and the preset cycle number of the single cell cluster by using other variations of the above formula (4) or an equivalent formula.
In the embodiment of the application, the imbalance degree of the historical charge and discharge capacities of all the battery clusters in the target battery cluster group is obtained according to the historical total charge and discharge capacities of all the battery clusters in the target battery cluster group and the corresponding sub charge and discharge powers. Further, an imbalance part is obtained according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance degree of the historical charge and discharge capacities of each battery cluster in the target battery cluster group. Therefore, the imbalance part in the embodiment of the application is related to the imbalance of the historical total charge and discharge capacity of each battery cluster, namely the imbalance part can be used for representing the imbalance condition of the cycle times of each battery cluster, so that the purpose of balancing the cycle times of each battery cluster can be realized by solving the objective function containing the imbalance part.
The following embodiments of the present application exemplarily describe the manner of obtaining the charge-discharge power loss section.
Optionally, the charge-discharge power loss part is obtained according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each battery cluster in the target battery cluster group.
Illustratively, the charge-discharge power distribution apparatus may acquire the charge-discharge power loss portion by the following equation (5) according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each of the battery clusters in the target battery cluster group.
Formula (5)
Wherein P loss represents a charge-discharge power loss portion of each cell cluster in the target cell cluster group; cele represents the electricity price corresponding to the unit power.
Of course, the charge-discharge power distribution device may also obtain the charge-discharge power loss portion through other variations of the above formula (5) or an equivalent formula according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each battery cluster in the target battery cluster group.
Therefore, in the embodiment of the application, the charge-discharge power loss part is obtained according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each battery cluster in the target battery cluster group, so that the aim of optimizing the charge-discharge efficiency of each battery cluster can be realized by solving the objective function containing the charge-discharge power loss part.
Illustratively, the charge-discharge power distribution apparatus may obtain the objective function by the following equation (6) according to the unbalance part and the charge-discharge power loss part.
Formula (6)
Where Obj fun represents the objective function.
Of course, the charge-discharge power distribution apparatus may also obtain the objective function by other variations of the above formula (6) or equivalent formulas according to the unbalance portion and the charge-discharge power loss portion.
Therefore, the objective function in the embodiment of the application comprises the imbalance part and the charge and discharge power loss part, and the purposes of balancing the cycle times of each battery cluster and optimizing the charge and discharge efficiency can be realized by solving the objective function.
Step S502, based on preset limiting conditions, the objective function is solved by taking the minimum value of the objective function as the objective, so as to obtain the sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
In this step, considering the rationality of the sub-charge-discharge power allocated to each battery cluster, the charge-discharge power allocation apparatus may solve the objective function with the minimum value of the objective function as the objective based on the preset constraint condition, so as to obtain the sub-charge-discharge power allocated to each battery cluster in the objective battery cluster group.
Illustratively, the preset constraints in the embodiments of the present application may include, but are not limited to: a first power limitation condition and a second power limitation condition.
The first power limitation condition may be that a sum of sub charge and discharge powers corresponding to each battery cluster in the target battery cluster group is equal to a target charge and discharge power corresponding to the target battery cluster group.
Illustratively, the first power limitation condition in the embodiment of the present application may be represented by the following formula (7):
formula (7)
Wherein, P obj represents the target charge-discharge power corresponding to the target battery cluster group.
Of course, the first power limitation condition in the embodiment of the present application may also be shown with reference to other variations of the above formula (7) or an equivalent formula.
The second power limitation condition may be that sub charge and discharge power corresponding to each battery cluster in the target battery cluster group is within a preset sub charge and discharge power limitation range.
Illustratively, the second power limitation condition in the embodiment of the present application may be represented by the following formula (8):
Formula (8)
Wherein,A sub-charge power limit representing a battery cluster i in the target battery cluster group; representing the sub-discharge power limit of the cell cluster i in the target cell cluster group. It should be understood that the lower limit value of the preset sub charge-discharge power limit range may be a sub charge power limit value, and the upper limit value of the preset sub charge-discharge power limit range may be a sub discharge power limit value.
Of course, the second power limitation condition in the embodiment of the present application may also be shown with reference to other variations of the above formula (8) or an equivalent formula.
Therefore, in the embodiment of the application, the objective function is solved by taking the minimum value of the objective function as the objective based on the preset limiting condition, so as to obtain the sub charge and discharge power distributed by each battery cluster in the objective battery cluster group, and further, the charge and discharge efficiency of each battery cluster is optimal and the cycle times of each battery cluster are balanced.
In summary, in the embodiment of the present application, by acquiring the objective function, the objective function includes an imbalance portion of the historical charge and discharge capacities of each battery cluster in the target battery cluster group and a charge and discharge power loss portion. Further, based on a preset limiting condition, the objective function is solved by taking the minimum value of the objective function as the objective, so as to obtain the sub charge and discharge power distributed by each battery cluster in the target battery cluster group. Therefore, in the embodiment of the application, the objective function is solved by taking the minimum value of the objective function comprising the unbalance degree part and the charge and discharge power loss part as the objective function based on the preset limiting condition, so that the sub charge and discharge power distributed by each battery cluster in the objective battery cluster group is obtained, the charge and discharge efficiency of each battery cluster is further optimized, the cycle times of each battery cluster are balanced, and the realization of the optimal operation of the overall efficiency of the energy storage system is further facilitated, and the operation life of the energy storage system is also improved.
In one embodiment, fig. 6 is a schematic flow chart of a charge-discharge power distribution method of an energy storage device according to another embodiment of the present application, and on the basis of the foregoing embodiment, in the following embodiment of the present application, the charge-discharge power distribution system shown in fig. 2 is taken as an example, and an overall flow chart of the charge-discharge power distribution method of the energy storage device according to the embodiment of the present application is described in an exemplary manner. As shown in fig. 6, the method according to the embodiment of the present application may include the following steps:
1) Information acquisition process
In the embodiment of the present application, the charge and discharge power distribution device may collect the battery cluster information of each battery cluster from the BMS corresponding to each battery cluster of the energy storage device, where the battery cluster information may include, but is not limited to, at least one of the following: SOC, historical total discharge capacity Cap disch, historical total charge capacity Cap chrg, sub-charge power limit P chrglim, sub-discharge power limit P dischlim.
In the embodiment of the application, the charge-discharge power distribution device can collect the total power P MPPT of each photovoltaic power generation device from the MPPT.
2) Power allocation procedure
In the embodiment of the present application, the charge-discharge power distribution device may determine the total charge-discharge power P BAT according to the power scheduling request value P need and the total power generation power P MPPT when receiving the power scheduling request value P need sent by the scheduling device. For example, the charge-discharge power distribution apparatus may set the difference between the power scheduling request value P need and the total generated power P MPPT as the total charge-discharge power P BAT.
Further, the charge-discharge power distribution device may divide each battery cluster into at least one battery cluster group according to the SOC of each battery cluster of the energy storage device and a plurality of preset charge-discharge thresholds. Wherein, the charge and discharge priorities of different battery cluster groups are different.
Further, the charge-discharge power distribution device may determine at least one target group of battery clusters to be charged and discharged from the at least one group of battery clusters, and the target charge-discharge power P obj corresponding to each target group of battery clusters, according to the total charge-discharge power P BAT and the charge-discharge power limit value corresponding to each group of battery clusters.
Further, for each target battery cluster group, the charge-discharge power distribution device may use the optimal charge-discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as the distribution targets, and distribute the target charge-discharge power P obj corresponding to the target battery cluster group, so as to obtain the sub charge-discharge power distributed by each battery cluster in the target battery cluster group.
For example, the charge/discharge power distribution device may obtain the objective function shown in the above formula (6), and solve the objective function with the minimum value of the objective function as the objective based on the preset constraint conditions shown in the above formula (7) and formula (8), so as to obtain the sub-charge/discharge power P i distributed by each battery cluster in the target battery cluster group.
Further, for each battery cluster in each target battery cluster group, the charge-discharge power distribution device may send the sub charge-discharge power distributed by the battery cluster to the DC/DC corresponding to the battery cluster, so as to control the DC/DC to charge and discharge with the power grid according to the sub charge-discharge power.
It should be noted that, the realizable manner of each step in the embodiment of the present application may refer to the related content in the foregoing embodiment, which is not described herein again.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a charge and discharge power distribution device for realizing the charge and discharge power distribution method of the energy storage device. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the charge-discharge power distribution device or devices provided below may be referred to the limitation of the charge-discharge power distribution method hereinabove, and will not be repeated herein.
In some embodiments, fig. 7 is a schematic structural diagram of a charge-discharge power distribution device according to some embodiments of the present application, where the charge-discharge power distribution device according to the embodiments of the present application may be applied to a charge-discharge power distribution apparatus. As shown in fig. 7, the charge and discharge power distribution apparatus according to the embodiment of the present application may include: an acquisition module 701, an allocation module 702 and a control module 703.
The acquiring module 701 is configured to acquire total charge and discharge power allocated to each battery cluster in the energy storage device;
the allocation module 702 is configured to allocate the total charge and discharge power with optimal charge and discharge efficiency of each battery cluster and balanced cycle number of each battery cluster of the energy storage device as allocation targets, so as to obtain sub charge and discharge power allocated to each battery cluster;
the control module 703 is configured to control each battery cluster to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster.
In some embodiments, the allocation module 702 includes:
a dividing unit for dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein, the charge and discharge priorities of different battery cluster groups are different;
The determining unit is used for determining at least one target battery cluster group which needs to be charged and discharged and target charging and discharging power corresponding to each target battery cluster group from at least one battery cluster group according to the total charging and discharging power and the charging and discharging power limit value corresponding to each battery cluster group;
The distribution unit is used for distributing the target charge and discharge power corresponding to the target battery cluster group by taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as distribution targets so as to obtain sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
In some embodiments, the allocation unit comprises:
An acquisition subunit, configured to acquire an objective function, where the objective function includes an imbalance portion of a historical charge and discharge capacity and a charge and discharge power loss portion of each battery cluster in the target battery cluster group;
and the solving subunit is used for solving the objective function by taking the minimum value of the objective function as the objective based on the preset limiting condition so as to obtain the sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
In some embodiments, the acquisition subunit is specifically configured to:
acquiring the imbalance degree of the historical charge and discharge capacities of all the battery clusters in the target battery cluster group according to the historical total charge and discharge capacities of all the battery clusters in the target battery cluster group and the corresponding sub charge and discharge powers;
And acquiring an imbalance part according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance degree of the historical charge and discharge capacities of each battery cluster in the target battery cluster group.
In some embodiments, the acquisition subunit is specifically configured to:
and acquiring a charge-discharge power loss part according to the electricity price corresponding to the unit power and the sub charge-discharge power corresponding to each battery cluster in the target battery cluster group.
In some embodiments, the preset limit conditions include: a first power limitation condition and a second power limitation condition; the first power limiting condition is that the sum of sub charge and discharge powers corresponding to all battery clusters in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group; the second power limiting condition is that the sub charge and discharge power corresponding to each battery cluster in the target battery cluster group is within a preset sub charge and discharge power limiting range.
In some embodiments, the determining unit is specifically configured to:
Determining a first candidate battery cluster with highest charge-discharge priority from at least one battery cluster group according to the total charge-discharge power;
And if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is larger than the absolute value of the total charge-discharge power, grouping the first candidate battery cluster as a target battery cluster, and taking the total charge-discharge power as the target charge-discharge power corresponding to the target battery cluster group.
In some embodiments, the determining unit is further configured to:
if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge-discharge power, the first candidate battery cluster is used as a first target battery cluster group, and the charge-discharge power limit value corresponding to the first candidate battery cluster is used as the target charge-discharge power corresponding to the first target battery cluster group;
Determining a second candidate battery cluster with high charge-discharge priority from at least one battery cluster group;
If the absolute value of the charge-discharge power limit value corresponding to the second candidate battery cluster is larger than the preset absolute value, grouping the second candidate battery cluster as a second target battery cluster, and taking the difference value of the total charge-discharge power and the charge-discharge power limit value corresponding to the first candidate battery cluster as the target charge-discharge power corresponding to the second target battery cluster group; the preset absolute value is the absolute value of the difference value between the total charge and discharge power and the charge and discharge power limit value corresponding to the first candidate battery cluster.
In some embodiments, the partitioning unit is specifically configured to:
And dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.
In some embodiments, the partitioning unit is specifically configured to:
Determining a plurality of target charge-discharge thresholds from a plurality of preset charge-discharge thresholds according to the total charge-discharge power;
Each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of target charge-discharge thresholds.
In some embodiments, the obtaining module 701 is specifically configured to:
Acquiring a power scheduling request value;
And determining the total charge-discharge power according to the power scheduling request value and the total power generation power of the power generation equipment.
In some embodiments, the control module 703 is specifically configured to:
And for each battery cluster, sub charge and discharge power corresponding to the battery cluster is sent to the DC/DC corresponding to the battery cluster so as to control the DC/DC and the power grid to charge and discharge.
The charge and discharge power distribution device of the energy storage device provided by the embodiment of the application can be used for executing the technical scheme in the charge and discharge power distribution method embodiment of the energy storage device, and the implementation principle and the technical effect are similar, and are not repeated here.
The respective modules in the above-described image processing apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules can be embedded in the processor in the charge and discharge power distribution equipment in a hardware form or can be stored in the memory in the charge and discharge power distribution equipment in a software form so that the processor can call and execute the operations corresponding to the above modules.
In some embodiments, fig. 8 is a schematic structural diagram of a charge-discharge power distribution apparatus according to some embodiments of the present application, and as shown in fig. 8, the charge-discharge power distribution apparatus according to the embodiment of the present application may include a processor, a memory, and a communication interface connected through a system bus. Wherein the processor of the charge and discharge power distribution device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the charge-discharge power distribution device is used for carrying out wired or wireless communication with external devices, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by the processor to implement the technical scheme in the embodiment of the charge and discharge power distribution method of the energy storage device according to the present application, and the implementation principle and the technical effect are similar, and are not repeated here.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation of the charge and discharge power distribution apparatus to which the present application is applied, and that a specific charge and discharge power distribution apparatus may include more or less components than those shown in the drawings, or may combine some components, or have a different arrangement of components.
In some embodiments, a charge and discharge power distribution device of an energy storage device is further provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the technical scheme in the charge and discharge power distribution method embodiment of the energy storage device according to the present application when executing the computer program, and its implementation principle and technical effect are similar, and are not repeated herein.
In some embodiments, a computer readable storage medium is provided, on which a computer program is stored, where the computer program implements the technical solution in the embodiments of the charge and discharge power distribution method of the energy storage device according to the present application when executed by a processor, and the implementation principle and technical effects are similar, and are not repeated herein.
In some embodiments, a computer program product is also provided, where the computer program product implements the technical solution in the embodiments of the charge and discharge power distribution method of the energy storage device according to the present application when the computer program is executed by a processor, and the implementation principle and technical effects are similar, and are not repeated herein.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (14)

1. A method for distributing charge and discharge power of an energy storage device, the method comprising:
Acquiring total charge and discharge power distributed for each battery cluster in the energy storage equipment;
Taking optimal charge and discharge efficiency of each battery cluster of the energy storage device and balanced cycle times of each battery cluster as distribution targets, and distributing the total charge and discharge power to obtain sub charge and discharge power distributed by each battery cluster;
controlling each battery cluster to charge and discharge according to the sub-charge and discharge power distributed by each battery cluster;
The allocating the total charge and discharge power to obtain sub charge and discharge power allocated to each battery cluster by using optimal charge and discharge efficiency of each battery cluster of the energy storage device and balanced cycle times of each battery cluster as allocation targets includes:
dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein, the charge and discharge priorities of different battery cluster groups are different;
determining at least one target battery cluster group to be charged and discharged and target charging and discharging power corresponding to each target battery cluster group from the at least one battery cluster group according to the total charging and discharging power and the charging and discharging power limit value corresponding to each battery cluster group;
And for each target battery cluster group, taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as distribution targets, and distributing the target charge and discharge power corresponding to the target battery cluster group to obtain sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
2. The method according to claim 1, wherein the allocating the target charge-discharge power corresponding to the target group of battery clusters with optimal charge-discharge efficiency and balanced cycle number of each battery cluster in the target group of battery clusters as allocation targets to obtain sub-charge-discharge power allocated to each battery cluster in the target group of battery clusters includes:
acquiring an objective function, wherein the objective function comprises an imbalance part and a charge-discharge power loss part of the historical charge-discharge capacity of each battery cluster in the target battery cluster group;
And based on a preset limiting condition, solving the objective function by taking the minimum value of the objective function as the objective to obtain sub charge and discharge power distributed by each battery cluster in the objective battery cluster group.
3. The method of claim 2, wherein obtaining an imbalance portion of historical charge-discharge capacities of each cell cluster in the target cluster group comprises:
Acquiring the imbalance degree of the historical charge and discharge capacities of all the battery clusters in the target battery cluster group according to the historical total charge and discharge capacities of all the battery clusters in the target battery cluster group and the corresponding sub charge and discharge powers;
And acquiring the unbalance part according to the energy storage system cost corresponding to the unit charge and discharge capacity and the unbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.
4. The method of claim 2, wherein obtaining the charge-discharge power loss portion of each cell cluster in the target group of cell clusters comprises:
and acquiring the charge and discharge power loss part according to the electricity price corresponding to the unit power and the sub charge and discharge power corresponding to each battery cluster in the target battery cluster group.
5. The method according to any one of claims 2-4, wherein the preset constraints comprise: a first power limitation condition and a second power limitation condition; the first power limiting condition is that the sum of sub charge and discharge powers corresponding to all battery clusters in the target battery cluster group is equal to target charge and discharge power corresponding to the target battery cluster group; the second power limiting condition is that the sub charge-discharge power is within a preset sub charge-discharge power limiting range.
6. The method according to any one of claims 2-4, wherein determining at least one target group of battery clusters that needs to be charged and discharged from the at least one group of battery clusters and the target charge and discharge power corresponding to each of the target group of battery clusters according to the total charge and discharge power and the charge and discharge power limit corresponding to each group of battery clusters comprises:
determining a first candidate battery cluster with highest charge-discharge priority from the at least one battery cluster group according to the total charge-discharge power;
And if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is larger than the absolute value of the total charge-discharge power, grouping the first candidate battery cluster as the target battery cluster, and taking the total charge-discharge power as the target charge-discharge power corresponding to the target battery cluster group.
7. The method of claim 6, wherein determining at least one target group of battery clusters to be charged and discharged from the at least one group of battery clusters and the target charge and discharge power corresponding to each of the target group of battery clusters according to the total charge and discharge power and the charge and discharge power limit corresponding to each group of battery clusters, further comprises:
if the absolute value of the charge-discharge power limit value corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge-discharge power, grouping the first candidate battery cluster as a first target battery cluster, and taking the charge-discharge power limit value corresponding to the first candidate battery cluster as the target charge-discharge power corresponding to the first target battery cluster group;
determining a second candidate battery cluster with a high charge-discharge priority from the at least one battery cluster group;
If the absolute value of the charge-discharge power limit value corresponding to the second candidate battery cluster is larger than a preset absolute value, the second candidate battery cluster is used as a second target battery cluster group, and the difference value of the total charge-discharge power and the charge-discharge power limit value corresponding to the first candidate battery cluster is used as the target charge-discharge power corresponding to the second target battery cluster group; the preset absolute value is an absolute value of a difference value between the total charge and discharge power and a charge and discharge power limit value corresponding to the first candidate battery cluster.
8. The method of any of claims 1-4, wherein the dividing each battery cluster into at least one group of battery clusters according to the SOC of each battery cluster comprises:
And dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.
9. The method of claim 8, wherein the dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge-discharge thresholds comprises:
determining a plurality of target charge-discharge thresholds from the plurality of preset charge-discharge thresholds according to the total charge-discharge power;
And dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and the target charge-discharge thresholds.
10. The method of any one of claims 1-4, wherein the obtaining the total charge-discharge power allocated for each battery cluster in the energy storage device comprises:
Acquiring a power scheduling request value;
And determining the total charge and discharge power according to the power scheduling request value and the total power generation power of the power generation equipment.
11. The method according to any one of claims 1 to 4, wherein controlling the charging and discharging of each battery cluster according to the sub-charging and discharging power allocated to the each battery cluster comprises:
And for each battery cluster, transmitting sub charge and discharge power corresponding to the battery cluster to the DC/DC corresponding to the battery cluster so as to control the DC/DC to charge and discharge with a power grid.
12. A charge and discharge power distribution apparatus for an energy storage device, the apparatus comprising:
The acquisition module is used for acquiring the total charge and discharge power distributed for each battery cluster in the energy storage equipment;
The distribution module is used for distributing the total charge and discharge power by taking the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the cycle times of each battery cluster as distribution targets so as to obtain sub charge and discharge power distributed by each battery cluster;
The control module is used for controlling each battery cluster to charge and discharge according to the sub-charge and discharge power distributed by each battery cluster;
The distribution module is specifically configured to:
dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein, the charge and discharge priorities of different battery cluster groups are different;
determining at least one target battery cluster group to be charged and discharged and target charging and discharging power corresponding to each target battery cluster group from the at least one battery cluster group according to the total charging and discharging power and the charging and discharging power limit value corresponding to each battery cluster group;
And for each target battery cluster group, taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balance of the cycle times of each battery cluster as distribution targets, and distributing the target charge and discharge power corresponding to the target battery cluster group to obtain sub charge and discharge power distributed by each battery cluster in the target battery cluster group.
13. A charge and discharge power distribution device of an energy storage device, comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1-11 when the computer program is executed.
14. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1-11.
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