CN113517706A - Primary frequency modulation coordination control method, system, equipment and storage medium for wind storage system - Google Patents
Primary frequency modulation coordination control method, system, equipment and storage medium for wind storage system Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention belongs to the field of electrical engineering, and discloses a primary frequency modulation coordination control method, a primary frequency modulation coordination control system, primary frequency modulation coordination control equipment and a primary frequency modulation coordination control storage medium for a wind storage system, wherein the primary frequency modulation coordination control method, the primary frequency modulation coordination control system, the primary frequency modulation coordination control equipment and the primary frequency modulation coordination control storage medium are used for acquiring the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system; obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system; acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system; obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit; and controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit, so that the consistency and controllability of each energy storage unit are ensured, and the capability of the whole energy storage system for responding to the primary frequency modulation is improved.
Description
Technical Field
The invention belongs to the field of electrical engineering, and relates to a primary frequency modulation coordination control method, a primary frequency modulation coordination control system, primary frequency modulation coordination control equipment and a primary frequency modulation coordination control storage medium for a wind power storage system.
Background
Wind power has been an important component of power supply because of its characteristics of abundant storage, reproducibility, wide distribution, no pollution, etc., which are receiving wide attention worldwide. In a high-proportion new energy power system, the frequency characteristics of the system are degraded due to the large amount of new energy, and frequency adjustment is often needed. The wind turbine generator is generally controlled according to maximum wind energy capture, and a reserved capacity mode is adopted in the primary frequency modulation active supporting process, so that the economy is poor.
In order to solve the problems, a wind power system is generally combined with an energy storage system to form a wind energy storage system to realize frequency adjustment. For example, patent application CN108011381A discloses a frequency modulation control method for a wind storage integrated system, in which an energy storage device is connected in parallel to a dc bus of a converter of a wind turbine generator, the wind turbine generator and the energy storage device are used as a whole to supply power to the system, and the power of the energy storage system is reasonably controlled, that is, the power of the energy storage device is controlled to realize the maximum power tracking of the wind turbine generator, and at the same time, the wind storage integrated system has an inertia response characteristic similar to that of a traditional synchronous generator, and actively participates in primary frequency modulation of a power grid. The patent application CN112600225A discloses a control method and a system for primary frequency modulation of a wind storage system, wherein the method comprises DFIG vector control of a bottom-layer double-fed asynchronous wind driven generator, ESS double-closed-loop control of an energy storage system, upper-layer power consistency control and SOC consistency control. The bottom layer control ensures the normal operation of the fan and the energy storage system, and the upper layer control adjusts the power distribution of the fan and the energy storage system: the energy storage equipment is ensured to be capable of adjusting the energy storage frequency modulation power output in real time according to different capacities of the energy storage equipment based on power consistency control; and adjusting the reference power of the DFIG network side converter based on an SOC consistency protocol, and ensuring that all energy storage equipment adjusts the output of the DFIG network side converter according to the SOC on the premise of charging and discharging simultaneously.
However, when the wind energy storage system performs frequency adjustment, the energy storage system is used as a whole to perform frequency modulation power response and is only used for realizing the frequency modulation function, and along with the development trend of a large-capacity multi-machine parallel centralized energy storage system, the energy storage system often includes a plurality of energy storage units inside, and the frequency modulation power of each energy storage unit is difficult to be reasonably distributed, so that circulation current may be generated among the energy storage units in the energy storage system, unnecessary energy insertion loss is caused, and the frequency modulation performance of the whole wind energy storage system is poor.
Disclosure of Invention
The invention aims to overcome the defect of poor frequency modulation performance of a wind storage system in the prior art, and provides a primary frequency modulation coordination control method, a primary frequency modulation coordination control system, primary frequency modulation coordination control equipment and a primary frequency modulation coordination control storage medium of the wind storage system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
in a first aspect of the present invention, a primary frequency modulation coordination control method for a wind storage system includes the following steps:
acquiring the frequency modulation power requirement of a wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system;
obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system;
acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system;
obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit;
and controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
The primary frequency modulation coordination control method of the wind storage system is further improved as follows:
the specific method for acquiring the frequency modulation power requirement of the wind storage system comprises the following steps: acquiring the grid frequency and the grid rated frequency of a grid-connected point of a wind storage system; when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0; otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
When the grid frequency is in the preset frequency dead zone range, the method further comprises the following steps: acquiring the charge state and rated power of an energy storage system; obtaining the return power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset return state of charge range, a power grid frequency and a frequency dead zone range; acquiring the charge state of each energy storage unit, and acquiring the return power of each energy storage unit according to the return power of the energy storage system and the charge state of each energy storage unit; and controlling each energy storage unit to perform energy storage regression according to the regression power of each energy storage unit.
After the regression power of the energy storage system is obtained, the method further comprises the following steps: and acquiring a boundary value of the power change borne by the power grid, and updating the regression power of the energy storage system into a smaller value of the regression power of the energy storage system and the boundary value of the power change borne by the power grid.
The preset frequency modulation self-adaptive coefficient comprises a plurality of coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is; the specific method for obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the preset frequency modulation adaptive coefficient comprises the following steps: and selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which the frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value.
The specific method for obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system comprises the following steps: and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the energy storage system.
The specific method for acquiring the current maximum frequency modulation power of each energy storage unit in the energy storage system comprises the following steps: acquiring the current power and rated power of each energy storage unit in the energy storage system; and obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
The operating state comprises a start-stop state, a discharge permission state and a charge permission state.
The specific method for obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit comprises the following steps: and distributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle to obtain the frequency modulation power requirement of each energy storage unit.
After the frequency modulation power requirements of each energy storage unit are obtained, the method further comprises the following steps: acquiring the current power and rated power of each energy storage unit; obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistributing result.
The specific method for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit comprises the following steps: and acquiring the current power of each energy storage unit, superposing the current power of each energy storage unit with the frequency modulation power requirement of each energy storage unit to obtain the frequency modulation power of each energy storage unit, and controlling each energy storage unit to operate with the frequency modulation power of each energy storage unit.
Further comprising: obtaining the frequency modulation power requirement of a wind power system in the wind storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system; and controlling the wind power system to perform primary frequency modulation according to the frequency modulation power requirement of the wind power system.
The specific method for obtaining the frequency modulation power requirement of the wind power system in the wind storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system comprises the following steps: and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the wind power system in the wind storage system.
The specific method for controlling the wind power system to perform primary frequency modulation according to the frequency modulation power requirement of the wind power system comprises the following steps: the method comprises the steps of obtaining the current power of the wind power system, superposing the current power of the wind power system with the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system, and controlling the wind power system to operate with the frequency modulation power of the wind power system.
In a second aspect of the present invention, a primary frequency modulation coordination control device for a wind storage system includes:
the first data acquisition module is used for acquiring the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system;
the first demand distribution module is used for obtaining the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system;
the second data acquisition module is used for acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system;
the second demand distribution module is used for obtaining the frequency modulation power demand of each energy storage unit according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit;
and the first control module is used for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
The primary frequency modulation coordination control equipment of the wind storage system is further improved in that:
the first data acquisition module comprises a wind storage demand acquisition module, and the wind storage demand acquisition module is used for acquiring the grid frequency and the grid rated frequency of a grid-connected point of a wind storage system; when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0; otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
The wind storage system demand acquisition module is further used for acquiring the charge state and the rated power of the energy storage system when the power grid frequency is in a preset frequency dead zone range; obtaining the return power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset return state of charge range, a power grid frequency and a frequency dead zone range; acquiring the charge state of each energy storage unit, and acquiring the return power of each energy storage unit according to the return power of the energy storage system and the charge state of each energy storage unit; and controlling each energy storage unit to perform energy storage regression according to the regression power of each energy storage unit.
The wind power storage system requirement obtaining module is further used for obtaining a boundary value of power change borne by the power grid, and updating the regression power of the energy storage system into a smaller value of the regression power of the energy storage system and the boundary value of power change borne by the power grid.
The preset frequency modulation self-adaptive coefficient comprises a plurality of coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is; the wind storage system demand acquisition module comprises a wind storage system demand calculation module, and the wind storage system demand calculation module is used for selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which a frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power demand of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value.
The first demand distribution module comprises an energy storage demand distribution module, the energy storage demand distribution module is used for distributing the frequency modulation power demand of the wind storage system according to the maximum frequency modulation power of the energy storage system and the minimum wind power abandoned power of the wind power system in the wind storage system as a distribution principle, and the frequency modulation power demand of the wind storage system is distributed to the wind power system only when the frequency modulation power demand of the wind storage system is reduced power, so that the frequency modulation power demand of the energy storage system is obtained.
The second data acquisition module comprises a power acquisition module and a maximum frequency modulation power acquisition module, and the power acquisition module is used for acquiring the current power and the rated power of each energy storage unit in the energy storage system; the maximum frequency modulation power acquisition module is used for acquiring the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
The second demand distribution module comprises an energy storage unit demand module, and the energy storage unit demand module is used for distributing the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, so as to obtain the frequency modulation power demand of each energy storage unit.
The second demand distribution module further comprises an energy storage unit checking module, and the energy storage unit checking module is used for acquiring the current power and the rated power of each energy storage unit; obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistributing result.
The first control module comprises an energy storage unit control module, the energy storage unit control module is used for obtaining the current power of each energy storage unit, the current power of each energy storage unit is superposed with the frequency modulation power requirement of each energy storage unit to obtain the frequency modulation power of each energy storage unit, and each energy storage unit is controlled to operate according to the frequency modulation power of each energy storage unit.
The system also comprises a third demand distribution module and a second control module; the third demand distribution module is used for obtaining the frequency modulation power demand of a wind power system in the wind storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system; the second control module is used for controlling the wind power system to carry out primary frequency modulation according to the frequency modulation power requirement of the wind power system.
In a third aspect of the present invention, a primary frequency modulation coordination control system of a wind storage system includes a data acquisition device, a communication device, and the primary frequency modulation coordination control device of the wind storage system;
the data acquisition device and the communication device are both connected with the primary frequency modulation coordination control equipment of the wind storage system; when the wind energy storage system is in a use state, the data acquisition device is connected with a grid-connected point of the wind energy storage system, a wind power system control unit in the wind energy storage system and an energy storage system control unit in the wind energy storage system, and the communication device is connected with the wind power system control unit and a PCS of each energy storage unit in the energy storage system;
the data acquisition device is used for acquiring the grid frequency of a grid-connected point of the wind storage system and the operation data of the wind power system and the energy storage system and sending the operation data to the primary frequency modulation coordination control equipment of the wind storage system;
the communication device is used for data interaction between the primary frequency modulation coordination control equipment of the wind power storage system, the wind power system control unit and the PCS of each energy storage unit.
In a fourth aspect of the present invention, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the primary frequency modulation coordination control method for a wind storage system when executing the computer program.
In a fifth aspect of the present invention, a computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the primary frequency modulation coordination control method for a wind storage system.
Compared with the prior art, the invention has the following beneficial effects:
according to the primary frequency modulation coordination control method of the wind storage system, the frequency modulation power requirement of the energy storage system is determined according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system, meanwhile, the frequency modulation power requirement of each energy storage unit is obtained according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the operation state of each energy storage unit, the reasonable distribution of the frequency modulation power requirement of each energy storage unit in the energy storage system is realized by comprehensively considering the current maximum frequency modulation power, the charge state and the operation state, the consistency and the controllability of each energy storage unit are ensured, and the capability of the whole energy storage system for responding to the primary frequency modulation is further improved.
Drawings
Fig. 1 is a flow chart of a primary frequency modulation coordination control method of a wind power storage system according to an embodiment of the present invention;
FIG. 2 is a power-frequency response curve diagram of a wind power system participating in primary frequency modulation according to an embodiment of the present invention;
FIG. 3 is a wind storage coordination control frequency modulation adaptive coefficient graph according to an embodiment of the present invention;
fig. 4 is a flow chart of a wind storage primary frequency modulation control coordination control method according to another embodiment of the present invention;
fig. 5 is a structural block diagram of a primary frequency modulation coordination control device of a wind storage system according to an embodiment of the present invention;
fig. 6 is a structural block diagram of a primary frequency modulation coordination control system of a wind power storage system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, in order to solve the problems of poor wind storage coordination and power distribution of a multi-machine parallel energy storage power station in a primary frequency modulation process of an existing wind storage system, a primary frequency modulation coordination control method of the wind storage system is provided, and an energy storage technology is utilized to cooperate with wind power output, respond to a primary frequency modulation requirement of a power grid, and improve wind storage combined operation capability. Specifically, the primary frequency modulation coordination control method of the wind storage system comprises the following steps.
S1: and acquiring the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system.
The specific method for acquiring the frequency modulation power requirement of the wind storage system comprises the following steps: acquiring the grid frequency and the grid rated frequency of a grid-connected point of a wind storage system; when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0; otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
Specifically, the frequency of a grid-connected point of the wind storage system is directly collected through a voltage transformer and a current transformer, and the change of the power grid frequency can be rapidly judged. Setting the monitoring period of the power grid frequency as T, and acquiring the power grid frequency every T. Meanwhile, referring to fig. 2, the frequency dead zone range of the power grid frequency regulation is set tof min，f max]According to the relevant standard, the frequency fluctuation dead zone is generally +/-0.05; for a wind storage system, upper and lower limit values of primary frequency modulation should be set, when the grid frequency exceeds the set limit value range, the energy storage system does not respond to the primary frequency modulation, and meanwhile, for the wind storage system to respond to the primary frequency modulation, a frequency modulation power demand delta should be definedP f To rated powerP N Is the active power clipping coefficientβNamely:
(ii) a The limiting coefficient is set according to actual conditions and definedβ∈[β min，β max]According to the regulations in the industry standard DLT 1870-2018 power system network source coordination technical specification,βthe maximum value is not less than 10%, for example, set to 1% -20%, that is, the adjusted active power variation deltaP f The ratio of the absolute value of the frequency modulation power to the rated power is within 1% -20%, and then the frequency modulation power is output.
Therefore, in order to prevent unnecessary frequency modulation response, when the grid frequency is in the preset frequency dead zone range, it is considered that frequency modulation is not currently required, i.e. the frequency modulation power demand of the wind storage system is 0. When the power grid frequency is out of the preset frequency dead zone range, obtaining the frequency deviation between the power grid frequency and the power grid rated frequency according to the obtained power grid frequency and the power grid rated frequency, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation and a preset frequency modulation adaptive coefficient, and specifically obtaining the frequency modulation power requirement of the wind storage system according to the following formula:
wherein,mthe frequency modulation adaptive coefficient is preset;f d represents the frequency dead band range boundary value, namely:f maxandf minrespectively representing the upper and lower boundaries of the frequency modulation dead zone;frepresenting the grid frequency.
Preferably, referring to fig. 3, the preset frequency modulation adaptive coefficient includes a plurality of coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is; the specific method for obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the preset frequency modulation adaptive coefficient comprises the following steps: and selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which the frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value. In this embodiment, two coefficient values are set tof 1Andf 2for distinguishing points, when the frequency of the power grid is close to the frequency dead zone range, the coefficient value of the frequency modulation adaptive coefficient is increased to play a role in accelerating frequency regulation, the frequency modulation adaptive coefficient can be adjusted according to the actual situation,f m 、f n the upper limit value and the lower limit value of the frequency modulation are respectively represented, and when the frequency of the power grid exceeds the limit value, the wind storage system does not increase the frequency modulation power any more.
Preferably, in order to ensure that each energy storage unit in the energy storage system has better power grid frequency modulation response, when the energy storage system does not need to perform frequency modulation, the SOC of each energy storage unit is recovered to the reference valueSOC b Referred to as energy storage SOC autoregression. Therefore, when the grid frequency is in the preset frequency dead zone rangeWhen enclosing, still include: acquiring the charge state and rated power of an energy storage system; obtaining the regression power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset regression state of charge range, a power grid frequency and a frequency dead zone range, wherein the power grid frequency comprises the actual frequency and the rated frequency of the power grid; and acquiring the charge state of each energy storage unit, acquiring the regression power of each energy storage unit according to the regression power of the energy storage system and the charge state of each energy storage unit, and controlling each energy storage unit to perform SOC autoregression according to the regression power of each energy storage unit. In this embodiment, the return power of the energy storage system is used as the frequency modulation power demand of the wind storage system, and therefore, the frequency modulation power demand of the wind storage system is updated through the following formula:
wherein, ΔP adj Is the return power of the energy storage system.
In particular, ΔP adj According to the determination of the SOC of the energy storage system, the SOC of the energy storage system is divided into the sequentially increased SOCSOC min，SOC l ，SOC b ，SOC h AndSOC maxwhen the SOC of the energy storage system is lower thanSOC l Or higher thanSOC h When necessary, theSOC b And performing SOC self-recovery regulation on the basis, wherein the return power of the energy storage system is as follows:
wherein,αthe self-recovery coefficient can be set according to the actual situation;P ESS,N is the rated power of the energy storage system.
Preferably, when the SOC of the energy storage system is adjusted in a regression manner, in order to ensure that the charging and discharging behavior does not have a great influence on the grid frequency of the grid-connected point in the SOC autoregressive process of the energy storage system, that is, the grid frequency cannot be influenced beyond the frequency dead zone range, a power change boundary value at which the grid can bear frequency fluctuation, including a power change boundary value at which the frequency rises and a power change boundary value at which the frequency falls, needs to be considered.
Specifically, the power change boundary value of the grid subjected to frequency reduction is determined according to the grid frequency
：
Wherein,
the difference rate is the primary frequency modulation;f N rated frequency for the power grid;fthe actual frequency of the power grid.
According to the frequency of the power grid, the power change boundary value of the power grid subjected to the frequency rise is determined by the following formula
：
Meanwhile, the regression power needs to be adjusted to a smaller value between the power change boundary value of the power grid subjected to the frequency fluctuation and the current regression power, namely:
the above equation shows that if the current regression power is smaller than the power change boundary value of the power grid subject to the frequency fluctuation, the adjusted regression power is the current regression power. If the current regression power is larger than the power change boundary value of the power grid subjected to the frequency fluctuation, the adjusted regression power is the power change boundary value of the power grid subjected to the frequency fluctuation, and then the specific method for calculating the regression power of each energy storage unit according to the autoregressive power of the energy storage system comprises the following steps:
wherein, Δp adj,i Is shown asiThe autoregressive power of each energy storage unit,SOC i is shown asiThe state of charge of each energy storage unit.
S2: and obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system.
The specific method for obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system comprises the following steps: and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the energy storage system.
In this embodiment, the distribution result of the frequency modulation power demand of the wind storage system is calculated with the goal of reducing the wind curtailment. Because wind turbine generators are mostly controlled according to maximum wind energy capture, and the wind turbine generators usually adopt a Maximum Power Point Tracking (MPPT) control mode, the condition that the response frequency of the wind turbine generators is reduced is not considered, and only when the SOC of each energy storage unit reaches the maximum value or the response frequency modulation power of an energy storage system reaches the maximum value and still does not meet the frequency modulation power requirement of the system, the wind abandoning of the fan is considered. Energy storage system response primary frequency modulation power deltaP ESS，f The requirements are satisfied:
wherein, ΔP w f,And the wind curtailment power of the wind power system responding to the primary frequency modulation is shown.
Whether the primary frequency modulation is required to be responded by the wind curtailment of the fan or not needs to be judged, and delta is explained belowP w f,The calculating method of (2):
(1) when the grid frequency exceeds the boundary of the frequency dead band range, i.e.f>f maxWhen the wind storage system is required to reduce power. If the energy storage system cannot be charged or the current available charging power DeltaP ESS Cannot fully meet the frequency modulated power requirements of wind storage systems, i.e.SOC ESS =SOC maxOr
Then the wind power system is required to abandon the wind, and delta at the momentP w f ,=△P f -△P ESS WhereinSOC ESS indicating the state of charge of the energy storage system.
(2) When the energy storage system can fully meet the primary frequency modulation power requirement, i.e.
And isSOC ESS <SOC maxIn time, without the wind power system participating in frequency modulation, deltaP w f ,=0。
(3) When the grid frequency is lower thanf minThe wind power system is required to increase the power, and a fan of the wind power system does not have the capability of responding to primary frequency modulation because the fan is in a maximum power tracking mode, and deltaP w f ,=0。
S3: and acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system.
The specific method for acquiring the current maximum frequency modulation power of each energy storage unit in the energy storage system comprises the following steps: acquiring the current power and rated power of each energy storage unit in the energy storage system; and obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
Specifically, the current power and the rated power of each energy storage unit in the energy storage system are obtained through a control system of the energy storage system.
The operation state comprises a start-stop state, a discharge permission state and a charge permission state. In this embodiment, a PCS (Power Conversion System) of each energy storage unit is used to describe an operation state, and 0 to 1 of the start-stop state of the PCS of each energy storage unit is established, where when the start is allowed, the PCS is started, and when a fault state occurs, the PCS should be turned off, and a start-stop state flag bit of the PCS indicates that the PCS is turned off
。
In order to protect each energy storage unit from being overcharged and overdischarged, a discharge permission flag bit of PCS of each energy storage unit is setu i2,And a charge enable flag bitu i3,：
Wherein,SOC max、SOC minrespectively the upper and lower limits of the state of charge of each energy storage unit,SOC i is as followsiThe state of charge of each energy storage unit.
S4: and obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit.
The specific method for obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit comprises the following steps: and distributing the frequency modulation power requirements of the energy storage system according to the frequency modulation power requirements of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a distribution principle to obtain the frequency modulation power requirements of each energy storage unit.
Specifically, the frequency modulation power demand of the energy storage system participating in primary frequency modulation needs to be distributed to each energy storage unit, the running state and SOC (state of charge) of the PCS (Power System) of each energy storage unit are monitored, the same charge state of each energy storage unit is taken as a distribution principle, and the frequency modulation power demand delta of each energy storage unit responding to the frequency modulation is determined through the following formulap ESS,i ：
Preferably, after the frequency modulation power requirement of each energy storage unit is obtained, the method further includes: acquiring the current power and rated power of each energy storage unit; obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistribution result.
Specifically, due to the fact that the running states of the energy storage units are different in the actual running process, the maximum power of the energy storage units is changed due to the fact that the energy storage unit battery cluster fails, and therefore power verification is conducted on the frequency modulation power requirements of the energy storage units.
Firstly, setting the following power constraints according to the initial power of each energy storage unit before participating in frequency modulation:
wherein,p imax,is shown asiStorage unitThe energy unit responds to the maximum power of the frequency modulation,p N representing the power rating of the energy storage unit.
Obtaining a power check value bySOP i ：
That is, when the frequency modulation power requirement of the energy storage unit reaches the maximum power of the energy unit responding to the frequency modulation,SOP i =1, otherwiseSOP i =0。
If it is notp ESS,i And =0, the energy storage unit may have a fault, and the start-stop flag position of the energy storage unit should be set to zero. Calculating the power deficit
If, if
Updating the zone bit and distributing the frequency modulation power demand of the energy storage system again in the above way until the power constraint of each energy storage unit is met, namely the power constraint of each energy storage unit is met
And
any one of the conditions.
Referring to fig. 4, a simplified process of S1-S4 is shown, in which parameter initialization is performed first, that is, parameters defining a monitoring period of a grid frequency, a frequency dead zone range, upper and lower limits of a primary frequency modulation, and an active power limiting coefficient are defined. Then, the frequency modulation power requirement is obtained, whether a fan is needed to participate is judged, namely whether the wind power system needs to abandon wind or not, when the fan is needed to participate, the maximum power of the energy storage system is firstly used as the response of the frequency modulation power requirement, then the residual part is the frequency modulation power requirement of the wind power system, and therefore the frequency modulation power requirement of each energy storage unit is the maximum power of the energy storage unit responding to frequency modulation. When the fans do not need to participate, the frequency modulation power requirements are all responded by the energy storage system, the energy storage system obtains the frequency modulation power requirements of the energy storage units according to the distribution principle that the charge states of the energy storage units are consistent, the power check values of the energy storage units are solved, and when the power check values are smaller than 1, namely the power check values are equal to 0, the frequency modulation power requirements of the energy storage units are verified to obtain the frequency modulation power requirements of the energy storage units. When the power check value is not less than 1, the fact that the frequency modulation power requirements of the energy storage units are not verified is indicated, the frequency modulation power requirements of the energy storage units need to be redistributed, then whether the shortage power is 0 or not is solved, if the shortage power is 0, the process is finished, otherwise, the power check value of each energy storage unit is solved again, and the operation is repeated until the power check values are all less than 1 or the shortage power is 0.
S5: and controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
The specific method for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit comprises the following steps: and acquiring the current power of each energy storage unit, superposing the current power of each energy storage unit with the frequency modulation power requirement of each energy storage unit to obtain the frequency modulation power of each energy storage unit, and controlling each energy storage unit to operate with the frequency modulation power of each energy storage unit.
Specifically, the frequency modulation power of each energy storage unit is obtained by superposing the current power of each energy storage unit with the frequency modulation power demand of each energy storage unit, and the arrangement ensures that the energy storage system keeps the existing running power when responding to primary frequency modulation without influencing the current action of the energy storage unit, for example, the energy storage system responds to peak clipping and valley filling, so under the arrangement, the energy storage system can respond to peak clipping and valley filling on one side and respond to primary frequency modulation on the other side.
Preferably, the primary frequency modulation coordination control method of the wind storage system further includes: obtaining the frequency modulation power requirement of a wind power system in the wind storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system; and controlling the wind power system to perform primary frequency modulation according to the frequency modulation power requirement of the wind power system.
Referring to the distribution process of the frequency modulation power demand of the wind storage system in S2, the specific method for obtaining the frequency modulation power demand of the wind power system in the wind storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system includes: and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the wind power system in the wind storage system.
Specifically, the specific method for controlling the wind power system to perform primary frequency modulation according to the frequency modulation power requirement of the wind power system comprises the following steps: the method comprises the steps of obtaining the current power of the wind power system, superposing the current power of the wind power system with the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system, and controlling the wind power system to operate with the frequency modulation power of the wind power system.
In summary, according to the primary frequency modulation coordination control method of the wind storage system, according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power demand of the energy storage system, the frequency modulation power demand of the wind power system and the frequency modulation power demand of the energy storage system are distributed, the wind power system is guaranteed to be capable of providing clean energy power to the maximum, meanwhile, according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state and the operation state of each energy storage unit, the frequency modulation power demand of each energy storage unit is obtained, the current maximum frequency modulation power, the charge state and the operation state are comprehensively considered, the reasonable distribution of the frequency modulation power demand of each energy storage unit in the energy storage system is achieved, the consistency and the controllability of each energy storage unit are guaranteed, and the capability of the whole energy storage system for responding to primary frequency modulation is further improved.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details of non-careless mistakes in the embodiment of the apparatus, please refer to the embodiment of the method of the present invention.
Referring to fig. 5, in a further embodiment of the present invention, a primary frequency modulation coordination control device of a wind storage system is provided, which can be used for implementing the primary frequency modulation coordination control method of the wind storage system.
The first data acquisition module is used for acquiring the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system; the first demand distribution module is used for obtaining the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system; the second data acquisition module is used for acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system; the second demand distribution module is used for obtaining the frequency modulation power demand of each energy storage unit according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit; the first control module is used for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
Preferably, the first data acquisition module comprises a wind storage demand acquisition module, and the wind storage demand acquisition module is used for acquiring the grid frequency and the grid rated frequency of a grid-connected point of a wind storage system; when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0; otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
Preferably, the wind storage system demand acquisition module is further configured to acquire a state of charge and a rated power of the energy storage system when the grid frequency is within a preset frequency dead zone range; obtaining the return power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset return state of charge range, a power grid frequency and a frequency dead zone range; acquiring the charge state of each energy storage unit, and acquiring the return power of each energy storage unit according to the return power of the energy storage system and the charge state of each energy storage unit; and controlling each energy storage unit to perform energy storage regression according to the regression power of each energy storage unit.
Preferably, the wind storage system demand acquisition module is further configured to acquire a boundary value of power change borne by the power grid, and update the regression power of the energy storage system to a smaller value of the regression power of the energy storage system and the boundary value of power change borne by the power grid.
Preferably, the preset frequency modulation adaptive coefficient comprises a plurality of coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is; the wind storage system demand acquisition module comprises a wind storage system demand calculation module, and the wind storage system demand calculation module is used for selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which a frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power demand of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value.
Preferably, the first demand distribution module comprises an energy storage demand distribution module, the energy storage demand distribution module is used for distributing the frequency modulation power demand of the wind storage system according to the maximum frequency modulation power of the energy storage system by using the minimum wind power curtailment power of a wind power system in the wind storage system as a distribution principle, and distributing the frequency modulation power demand of the wind storage system to the wind power system only when the frequency modulation power demand of the wind storage system is power reduction, so as to obtain the frequency modulation power demand of the energy storage system.
Preferably, the second data acquisition module comprises a power acquisition module and a maximum frequency modulation power acquisition module, and the power acquisition module is used for acquiring the current power and the rated power of each energy storage unit in the energy storage system; the maximum frequency modulation power acquisition module is used for acquiring the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
Preferably, the second demand distribution module includes an energy storage unit demand module, and the energy storage unit demand module is configured to distribute the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state, and the operating state of each energy storage unit, using the charge state consistency of each energy storage unit as a power distribution principle, and obtain the frequency modulation power demand of each energy storage unit.
Preferably, the second demand distribution module further comprises an energy storage unit checking module, and the energy storage unit checking module is used for acquiring the current power and the rated power of each energy storage unit; obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistributing result.
Preferably, the first control module includes an energy storage unit control module, the energy storage unit control module is configured to obtain current power of each energy storage unit, the current power of each energy storage unit is superimposed with a frequency modulation power requirement of each energy storage unit to obtain frequency modulation power of each energy storage unit, and each energy storage unit is controlled to operate with the frequency modulation power of each energy storage unit.
Preferably, the primary frequency modulation coordination control equipment of the wind storage system further comprises a third demand distribution module and a second control module; the third demand distribution module is used for obtaining the frequency modulation power demand of a wind power system in the wind storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system; the second control module is used for controlling the wind power system to carry out primary frequency modulation according to the frequency modulation power requirement of the wind power system.
Preferably, the third demand distribution module comprises a wind power demand distribution module, the wind power demand distribution module is used for distributing the frequency modulation power demand of the wind storage system according to the maximum frequency modulation power of the energy storage system by using the minimum wind power curtailment power of the wind power system in the wind storage system as a distribution principle, and distributing the frequency modulation power demand of the wind power system to the wind power system only when the frequency modulation power demand of the wind storage system is power reduction, so as to obtain the frequency modulation power demand of the wind power system in the wind storage system.
Preferably, the second control module comprises a wind power system control module, the wind power system control module is used for acquiring the current power of the wind power system, the current power of the wind power system is superposed with the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system, and the wind power system is controlled to operate with the frequency modulation power of the wind power system.
Referring to fig. 6, in another embodiment of the present invention, a primary frequency modulation coordination control system of a wind storage system is provided, which includes a data acquisition device, a communication device, and the primary frequency modulation coordination control device of the wind storage system; the data acquisition device and the communication device are both connected with the primary frequency modulation coordination control equipment of the wind storage system; when the wind energy storage system is in a use state, the data acquisition device is connected with a grid-connected point of the wind energy storage system, a wind power system control unit in the wind energy storage system and an energy storage system control unit in the wind energy storage system, and the communication device is connected with the wind power system control unit and a PCS of each energy storage unit in the energy storage system; the data acquisition device is used for acquiring the grid frequency of a grid-connected point of the wind storage system and the operation data of the wind power system and the energy storage system and sending the operation data to the primary frequency modulation coordination control equipment of the wind storage system; the communication device is used for data interaction between the primary frequency modulation coordination control equipment of the wind power storage system, the wind power system control unit and the PCS of each energy storage unit.
Specifically, the primary frequency modulation coordination control equipment of the wind storage system is arranged between the wind storage system and a power grid, and the grid-connected point voltage of the wind storage system is directly collected through a data collection device such as PT or CT to calculate the system frequency and voltage. And the next time, through a communication device, is accessed into a fast control network interconnected with the PCS of each energy storage unit in the energy storage system, and a charge and discharge power instruction currently executed by each PCS is obtained, wherein the instruction comes from a power grid dispatching or local device, and millisecond communication is realized. The interaction of the real-time running information of the wind storage system is realized through the communication with the PCS of the energy storage unit and the fan EMP/VMP, and the received real-time data is written into a real-time database of the system through a local area network point-to-point communication mode. And the communication device is utilized to transmit the frequency modulation power requirement of the energy storage unit to the PCS of each energy storage unit through the fast channel, so that the regulation and control function of the energy storage system is realized.
In yet another embodiment of the present invention, a computer device is provided that includes a processor and a memory for storing a computer program comprising program instructions, the processor for executing the program instructions stored by the computer storage medium. The Processor may be a Central Processing Unit (CPU), or may be other general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which is a computing core and a control core of the terminal, and is specifically adapted to load and execute one or more instructions in a computer storage medium to implement a corresponding method flow or a corresponding function; the processor provided by the embodiment of the invention can be used for the operation of the primary frequency modulation coordination control method of the wind storage system.
In yet another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a Memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in the computer-readable storage medium may be loaded and executed by the processor to implement the corresponding steps of the primary frequency modulation coordination control method of the wind storage system in the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (27)
1. A primary frequency modulation coordination control method of a wind storage system is characterized by comprising the following steps:
acquiring the frequency modulation power requirement of a wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system;
obtaining the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system;
acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system;
obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit;
and controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
2. The primary frequency modulation coordination control method of the wind storage system according to claim 1, wherein the specific method for acquiring the frequency modulation power requirement of the wind storage system is as follows:
acquiring the grid frequency and the grid rated frequency of a grid-connected point of a wind storage system;
when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0;
otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
3. The primary frequency modulation coordinated control method of the wind storage system according to claim 2, wherein when the grid frequency is in a preset frequency dead zone range, the method further comprises:
acquiring the charge state and rated power of an energy storage system;
obtaining the return power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset return state of charge range, a power grid frequency and a frequency dead zone range;
acquiring the charge state of each energy storage unit, and acquiring the return power of each energy storage unit according to the return power of the energy storage system and the charge state of each energy storage unit;
and controlling each energy storage unit to perform energy storage regression according to the regression power of each energy storage unit.
4. The primary frequency modulation coordination control method of the wind energy storage system according to claim 3, wherein after obtaining the return power of the energy storage system, the method further comprises:
and acquiring a boundary value of the power change borne by the power grid, and updating the regression power of the energy storage system into a smaller value of the regression power of the energy storage system and the boundary value of the power change borne by the power grid.
5. The primary frequency modulation coordination control method of the wind power storage system according to claim 2, wherein the preset frequency modulation adaptive coefficient comprises a plurality of coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is;
the specific method for obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the preset frequency modulation adaptive coefficient comprises the following steps:
and selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which the frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value.
6. The primary frequency modulation coordination control method of the wind storage system according to claim 1, wherein the specific method for obtaining the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system comprises:
and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the energy storage system.
7. The primary frequency modulation coordination control method of the wind energy storage system according to claim 1, wherein the specific method for obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system is as follows:
acquiring the current power and rated power of each energy storage unit in the energy storage system;
and obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
8. The wind storage system primary frequency modulation coordinated control method according to claim 1, wherein the operation state comprises a start-stop state, a discharge allowance state and a charge allowance state.
9. The primary frequency modulation coordination control method of the wind storage system according to claim 1, wherein the specific method for obtaining the frequency modulation power requirement of each energy storage unit according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the operation state of each energy storage unit comprises:
and distributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle to obtain the frequency modulation power requirement of each energy storage unit.
10. The primary frequency modulation coordination control method of the wind energy storage system according to claim 9, wherein after obtaining the frequency modulation power requirement of each energy storage unit, the method further comprises:
acquiring the current power and rated power of each energy storage unit;
obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit;
and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistributing result.
11. The primary frequency modulation coordination control method of the wind energy storage system according to claim 1, wherein the specific method for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit comprises:
and acquiring the current power of each energy storage unit, superposing the current power of each energy storage unit with the frequency modulation power requirement of each energy storage unit to obtain the frequency modulation power of each energy storage unit, and controlling each energy storage unit to operate with the frequency modulation power of each energy storage unit.
12. The primary frequency modulation coordination control method of the wind storage system according to claim 1, characterized by further comprising: obtaining the frequency modulation power requirement of a wind power system in the wind storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system;
and controlling the wind power system to perform primary frequency modulation according to the frequency modulation power requirement of the wind power system.
13. The primary frequency modulation coordination control method for the wind storage system according to claim 12, wherein the specific method for obtaining the frequency modulation power requirement of the wind power system in the wind storage system according to the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of the energy storage system comprises the following steps:
and distributing the frequency modulation power requirement of the wind storage system to the wind power system only when the frequency modulation power requirement of the wind storage system is reduced power, so as to obtain the frequency modulation power requirement of the wind power system in the wind storage system.
14. The primary frequency modulation coordination control method of the wind storage system according to claim 12, wherein the specific method for controlling the wind power system to perform primary frequency modulation according to the frequency modulation power demand of the wind power system comprises:
the method comprises the steps of obtaining the current power of the wind power system, superposing the current power of the wind power system with the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system, and controlling the wind power system to operate with the frequency modulation power of the wind power system.
15. The utility model provides a wind system primary control of frequency modulation coordinated control equipment that stores up which characterized in that includes:
the first data acquisition module is used for acquiring the frequency modulation power requirement of the wind storage system and the maximum frequency modulation power of an energy storage system in the wind storage system;
the first demand distribution module is used for obtaining the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system;
the second data acquisition module is used for acquiring the current maximum frequency modulation power, the charge state and the running state of each energy storage unit in the energy storage system;
the second demand distribution module is used for obtaining the frequency modulation power demand of each energy storage unit according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the charge state and the running state of each energy storage unit;
and the first control module is used for controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power requirement of each energy storage unit.
16. The primary frequency modulation coordination control device of the wind storage system according to claim 15, wherein said first data acquisition module comprises a wind storage demand acquisition module, said wind storage demand acquisition module is used for acquiring grid frequency and grid rated frequency of grid-connected point of the wind storage system; when the power grid frequency is in a preset frequency dead zone range, the frequency modulation power requirement of the wind storage system is 0; otherwise, obtaining the frequency modulation power requirement of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and a preset frequency modulation adaptive coefficient.
17. The primary frequency modulation coordinated control equipment of the wind storage system according to claim 16, wherein the wind storage system demand acquisition module is further configured to acquire a state of charge and a rated power of the energy storage system when the grid frequency is within a preset frequency dead zone range; obtaining the return power of the energy storage system according to the state of charge and the rated power of the energy storage system, a preset self-recovery coefficient, a preset return state of charge range, a power grid frequency and a frequency dead zone range; acquiring the charge state of each energy storage unit, and acquiring the return power of each energy storage unit according to the return power of the energy storage system and the charge state of each energy storage unit; and controlling each energy storage unit to perform energy storage regression according to the regression power of each energy storage unit.
18. The wind storage system primary frequency modulation coordination control device according to claim 17, wherein said wind storage system demand obtaining module is further configured to obtain a boundary value of grid power change, and update the return power of the energy storage system to a smaller value of the return power of the energy storage system and the boundary value of grid power change.
19. The wind storage system primary frequency modulation coordination control device according to claim 16, wherein said preset frequency modulation adaptive coefficient comprises a plurality of coefficient values, a coefficient value corresponds to a frequency deviation range, and the larger the coefficient value is, the larger the boundary value of the corresponding frequency deviation range is;
the wind storage system demand acquisition module comprises a wind storage system demand calculation module, and the wind storage system demand calculation module is used for selecting a corresponding coefficient value from preset frequency modulation adaptive coefficients according to a frequency deviation range to which a frequency deviation between the power grid frequency and the power grid rated frequency belongs, and obtaining the frequency modulation power demand of the wind storage system according to the frequency deviation between the power grid frequency and the power grid rated frequency and the selected coefficient value.
20. The primary frequency modulation coordination control device of the wind storage system according to claim 15, wherein the first demand distribution module comprises an energy storage demand distribution module, the energy storage demand distribution module is configured to distribute the frequency modulation power demand of the wind storage system according to the maximum frequency modulation power of the energy storage system on the basis of the distribution principle that the curtailment wind power of the wind power system in the wind storage system is minimum, and distribute the frequency modulation power demand of the wind storage system to the wind power system only when the frequency modulation power demand of the wind storage system is reduced power, so as to obtain the frequency modulation power demand of the energy storage system.
21. The primary frequency modulation coordination control device of the wind storage system according to claim 15, wherein the second data obtaining module includes a power obtaining module and a maximum frequency modulation power obtaining module, and the power obtaining module is configured to obtain a current power and a rated power of each energy storage unit in the energy storage system; the maximum frequency modulation power acquisition module is used for acquiring the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and the rated power of each energy storage unit in the energy storage system.
22. The wind storage system primary frequency modulation coordination control device according to claim 15, wherein said second demand distribution module comprises an energy storage unit demand module, said energy storage unit demand module is configured to distribute the frequency modulation power demand of the energy storage system according to the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power, the state of charge and the operating state of each energy storage unit, and using the state of charge consistency of each energy storage unit as a power distribution principle, so as to obtain the frequency modulation power demand of each energy storage unit.
23. The wind storage system primary frequency modulation coordination control device according to claim 22, wherein said second demand distribution module further comprises an energy storage unit verification module, said energy storage unit verification module is configured to obtain a current power and a rated power of each energy storage unit; obtaining power constraints of each energy storage unit according to the current power and rated power of each energy storage unit, and checking the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; and when the energy storage units do not pass the verification, modifying the running state of the energy storage units which do not pass the verification, redistributing the frequency modulation power requirement of the energy storage system according to the frequency modulation power requirement of the energy storage system, the current maximum frequency modulation power, the charge state and the modified running state of each energy storage unit by taking the charge state consistency of each energy storage unit as a power distribution principle, and updating the frequency modulation power requirement of each energy storage unit according to a redistributing result.
24. A wind storage system primary frequency modulation coordinated control device according to claim 15, further comprising a third demand allocation module and a second control module;
the third demand distribution module is used for obtaining the frequency modulation power demand of a wind power system in the wind storage system according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system; the second control module is used for controlling the wind power system to carry out primary frequency modulation according to the frequency modulation power requirement of the wind power system.
25. A wind storage system primary frequency modulation coordination control system, characterized by comprising a data acquisition device, a communication device and a wind storage system primary frequency modulation coordination control device according to any one of claims 15 to 24;
the data acquisition device and the communication device are both connected with the primary frequency modulation coordination control equipment of the wind storage system; when the wind energy storage system is in a use state, the data acquisition device is connected with a grid-connected point of the wind energy storage system, a wind power system control unit in the wind energy storage system and an energy storage system control unit in the wind energy storage system, and the communication device is connected with the wind power system control unit and a PCS of each energy storage unit in the energy storage system;
the data acquisition device is used for acquiring the grid frequency of a grid-connected point of the wind storage system and the operation data of the wind power system and the energy storage system and sending the operation data to the primary frequency modulation coordination control equipment of the wind storage system;
the communication device is used for data interaction between the primary frequency modulation coordination control equipment of the wind power storage system, the wind power system control unit and the PCS of each energy storage unit.
26. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the primary tuning coordination control method of the wind storage system according to any one of claims 1 to 14 when executing the computer program.
27. A computer-readable storage medium, in which a computer program is stored, and the computer program is executed by a processor to implement the steps of the primary frequency modulation coordination control method of the wind storage system according to any one of claims 1 to 14.
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