WO2023036344A1 - Coordinated control method, system, and device for primary frequency modulation of wind storage system, and storage medium - Google Patents

Abstract

The present disclosure relates to the field of electrical engineering, and discloses a coordinated control method, system, and device for primary frequency modulation of a wind storage system, and a storage medium. The method comprises: obtaining 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; obtaining the current maximum frequency modulation power, the state of charge, 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 state of charge, and the running state of each energy storage unit; and according to the frequency modulation power requirement of each energy storage unit, controlling each energy storage unit to perform primary frequency modulation. Therefore, the consistency and controllability of each energy storage unit are improved, and the primary frequency modulation response capability of the whole energy storage system is improved.

Description

Coordinated control method, system, equipment and storage medium for primary frequency modulation of wind storage system

Cross References to Related Applications

This disclosure claims the priority of the Chinese patent application submitted to the China Patent Office on September 13, 2021, with the application number 202111068427.1, and the application name is "A wind storage system primary frequency modulation coordination control method, system, equipment and storage medium", all of which The contents are incorporated by reference in this disclosure.

technical field

The disclosure belongs to the field of electrical engineering, and relates to a primary frequency modulation coordinated control method, system, equipment and storage medium of a wind storage system.

Background technique

Due to its rich reserves, renewable, wide distribution, and non-polluting characteristics, wind power has attracted worldwide attention and has become an important part of power supply. In a power system with a high proportion of new energy, a large number of new energy sources will lead to degradation of system frequency characteristics, and frequency adjustment is often required. Wind turbines are generally controlled according to the maximum wind energy capture. When actively supporting a frequency modulation, the method of reserve capacity is often used, which is not economical.

In view of the above problems, the current related technologies generally combine the wind power system with the energy storage system to form a wind storage system to realize frequency regulation. For example, the patent application CN108011381A discloses a frequency modulation control method for an integrated wind-storage system. In this method, an energy storage device is connected in parallel on the DC bus of the wind turbine converter, and the wind turbine and the energy storage device are used as a whole to supply power to the system. Through the reasonable control of the active power of the energy storage system, that is, the control of the power of the energy storage device can realize the maximum power tracking of the wind turbine and at the same time make the unit have the inertia response characteristics of the traditional synchronous generator, so that the wind-storage integrated system can be similar to the traditional synchronous generator. Inertia response characteristics, and actively participate in the primary frequency regulation of the power grid. Patent application CN112600225A discloses a control method and system for primary frequency regulation of wind storage system, the method includes the underlying double fed asynchronous wind generator (Double Fed Induction Generator, DFIG) vector control and energy storage system (Energy Storage System, ESS) double closed-loop control, upper layer power consistency control and state of charge (State Of Charge, SOC) consistency control. The bottom control ensures the normal operation of the wind turbine and the energy storage system, and the upper control adjusts the power distribution of the wind turbine and the energy storage system: based on power consistency control, it ensures that the energy storage device can adjust the energy storage frequency modulation power output in real time according to its different capacity; based on SOC consistency The protocol adjusts the reference power of the DFIG grid-side converter, so that all energy storage devices can adjust their output according to the SOC under the premise of simultaneous charging and discharging.

However, when the above-mentioned wind storage systems perform frequency adjustment, the energy storage system is used as a whole to perform frequency modulation power response, and it is only used to realize the frequency modulation function. With the development trend of large-capacity multi-machine parallel centralized energy storage systems, The energy storage system often includes multiple energy storage units, and it is difficult to allocate the frequency modulation power of each energy storage unit reasonably, which makes the consistency between the energy storage units in the energy storage system worse, which in turn leads to poor frequency modulation performance of the entire wind storage system.

Contents of the invention

Embodiments of the present disclosure provide a wind storage system primary frequency modulation coordinated control method, system, equipment and storage medium.

In a first aspect, the present disclosure provides a method for coordinated control of primary frequency modulation of a wind storage system, including the following steps:

Obtain the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system;

The method for obtaining the frequency regulation power demand of the wind storage system includes: obtaining the grid frequency of the grid connection point of the wind storage system and the rated frequency of the grid; is 0; otherwise, according to the frequency deviation between the grid frequency and the rated frequency of the grid, and the preset frequency modulation adaptive coefficient, the frequency modulation power demand of the wind storage system is obtained;

When the grid frequency is within the preset frequency dead zone range, it also includes: obtaining the state of charge and rated power of the energy storage system; according to the state of charge and rated power of the energy storage system, and preset self-recovery Coefficient and preset return state of charge range, as well as grid frequency and frequency dead zone range, to obtain the return power of the energy storage system; to obtain the state of charge of each energy storage unit, according to the return power of the energy storage system and each energy storage unit According to the state of charge of each energy storage unit, the return power of each energy storage unit is obtained; according to the return power of each energy storage unit, each energy storage unit is controlled to perform energy storage return;

According to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system, the frequency modulation power demand of the energy storage system is obtained;

Obtain the current maximum frequency modulation power, state of charge and operating state of each energy storage unit in the energy storage system;

According to the frequency modulation power demand of the energy storage system, and the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, the frequency modulation power demand of each energy storage unit is obtained;

Each energy storage unit is controlled to perform a frequency modulation according to the frequency modulation power demand of each energy storage unit.

The improvement of the primary frequency modulation coordinated control method of the disclosed wind storage system in some embodiments of the present disclosure lies in:

After the return power of the energy storage system is obtained, it also includes: obtaining the boundary value of the power grid withstand power change, and updating the return power of the energy storage system to the comparison between the return power of the energy storage system and the boundary value of the power grid withstand power change. small value.

The preset frequency modulation adaptive coefficient includes several 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 method of obtaining the frequency modulation power demand of the wind storage system includes: according to the frequency deviation range of the frequency deviation between the grid frequency and the grid rated frequency, from the preset frequency modulation The corresponding coefficient value is selected from the adaptive coefficient, and the frequency modulation power demand of the wind storage system is obtained according to the frequency deviation between the grid frequency and the rated frequency of the grid and the selected coefficient value.

The 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 includes: according to the maximum frequency modulation power of the energy storage system, the minimum abandoned wind power of the wind power system in the wind storage system is The allocation principle is to allocate the frequency modulation power demand of the wind storage system, and in the case that the frequency modulation power demand of the wind storage system is reduced power, allocate the frequency modulation power demand of the wind power storage system to the wind power system, and obtain the frequency modulation power demand of the energy storage system.

The method for obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system includes: obtaining the current power and rated power of each energy storage unit in the energy storage system; according to the current power and rated power of each energy storage unit in the energy storage system power to obtain the current maximum frequency modulation power of each energy storage unit in the energy storage system.

The running state includes a start-stop state, a discharge-allowed state and a charge-allowed state.

The method 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, state of charge and operation state of each energy storage unit includes: according to the frequency modulation power demand of the energy storage system , as well as the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, with the consistency of state of charge of each energy storage unit as the power allocation principle, allocate the frequency modulation power demand of the energy storage system, and obtain the energy storage unit FM power requirements.

After obtaining the frequency modulation power demand of each energy storage unit, it also includes: obtaining the current power and rated power of each energy storage unit; obtaining the power constraint of each energy storage unit according to the current power and rated power of each energy storage unit, and Energy unit power constraints check the frequency modulation power requirements of each energy storage unit; in the case of failure to pass the check, modify the operation status of the failed energy storage unit, and according to the frequency modulation power demand of the energy storage system, and each storage unit The current maximum frequency modulation power, state of charge and modified operating state of the energy storage unit, based on the consistency of the state of charge of each energy storage unit as the power allocation principle, redistribute the frequency modulation power requirements of the energy storage system, and update according to the redistribution results Frequency modulation power demand of each energy storage unit.

The method for controlling each energy storage unit to perform a frequency modulation according to the frequency modulation power demand of each energy storage unit includes: obtaining the current power of each energy storage unit, and superimposing the current power of each energy storage unit with the frequency modulation power demand of each energy storage unit to obtain each energy storage unit. The frequency modulation power of the energy storage unit is used to control each energy storage unit to run at the frequency modulation power of each energy storage unit.

It also includes: 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; controlling the wind power system to perform a frequency modulation according to the frequency modulation power demand of the wind power system.

The method of 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: according to the maximum frequency modulation power of the energy storage system, the wind power system in the wind storage system is used to The minimum power is the allocation principle, and the frequency modulation power demand of the wind storage system is allocated, and when the frequency modulation power demand of the wind storage system is reduced power, the frequency modulation power demand of the wind power system is allocated to the wind power system, and the wind power system in the wind storage system is obtained FM power demand.

The method for controlling the wind power system to perform a frequency modulation according to the frequency modulation power demand of the wind power system includes: obtaining the current power of the wind power system, superimposing the current power of the wind power system on 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 with the frequency modulation of the wind power system Power running.

In the second aspect, the present disclosure provides a wind storage system primary frequency modulation coordinated control device, including:

The first data acquisition module is configured to acquire the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system;

The first demand allocation module is configured to obtain 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 configured to acquire the current maximum frequency modulation power, charge state and operation state of each energy storage unit in the energy storage system;

The second demand allocation module is configured to obtain 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, state of charge and operation state of each energy storage unit;

The first control module is configured to control each energy storage unit to perform frequency modulation once according to the frequency modulation power demand of each energy storage unit.

The first data acquisition module includes a wind storage demand acquisition module, and the wind storage demand acquisition module is configured to acquire the grid frequency and the grid rated frequency of the grid connection point of the wind storage system; when the grid frequency is within the preset frequency dead zone range , the frequency modulation power demand of the wind storage system is 0; otherwise, according to the frequency deviation between the grid frequency and the grid rated frequency, and the preset frequency modulation adaptive coefficient, the frequency modulation power demand of the wind storage system is obtained.

The demand acquisition module of the wind storage system is also configured to obtain the state of charge and rated power of the energy storage system when the grid frequency is within the preset frequency dead zone range; according to the state of charge and rated power of the energy storage system , as well as the preset self-recovery coefficient and the preset return state of charge range, as well as the grid frequency and frequency dead zone range, to obtain the return power of the energy storage system; to obtain the state of charge of each energy storage unit, according to the energy storage system The regressed power of each energy storage unit and the state of charge of each energy storage unit are used to obtain the regressed power of each energy storage unit; according to the regressed power of each energy storage unit, each energy storage unit is controlled to perform energy storage reversion.

In a third aspect, the present disclosure provides a primary frequency modulation coordination control system of a wind storage system, including a data acquisition device, a communication device, and the above-mentioned primary frequency modulation coordination control equipment of the wind storage system;

Both the data acquisition device and the communication device are connected to the primary frequency modulation coordination control equipment of the wind storage system; when in use, the data acquisition device is connected to the grid-connected point of the wind storage system, the control unit of the wind power system in the wind storage system and the storage in the wind storage system The energy system control unit is connected, and the communication device is connected to the wind power system control unit and the energy storage converter PCS of each energy storage unit in the energy storage system;

The data acquisition device is configured to collect the grid frequency of the grid-connected point of the wind storage system, as well as the operation data of the wind power system and the energy storage system, and send them to the primary frequency modulation coordination control equipment of the wind storage system;

The communication device is configured as a data exchange between the primary frequency modulation coordination control equipment of the wind storage system, the control unit of the wind power system and the PCS of each energy storage unit.

In a fourth aspect, the present disclosure provides a computer device, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the above-mentioned risk is realized. The steps of the storage system primary frequency modulation coordination control method.

In a fifth aspect, the present disclosure provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned primary frequency modulation coordinated control method for a wind storage system are implemented.

Compared with related technologies, the present disclosure has the following beneficial effects:

The primary frequency modulation coordination control method of the disclosed 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, realizes the determination of the frequency modulation power demand of the energy storage system, and at the same time, according to the frequency modulation power demand of the energy storage system, and The current maximum frequency modulation power, state of charge and operation state of each energy storage unit are obtained to obtain the frequency modulation power demand of each energy storage unit. By comprehensively considering the current maximum frequency modulation power, state of charge and operation state, the energy storage system realizes The reasonable allocation of frequency modulation power requirements of energy units improves the consistency and controllability of each energy storage unit, thereby improving the ability of the entire energy storage system to respond to primary frequency modulation.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosed embodiments.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a flow chart of a primary frequency modulation coordinated control method for a wind storage system provided by an embodiment of the present disclosure;

FIG. 2 is a power-frequency response curve diagram of a wind power system participating in primary frequency regulation provided by an embodiment of the present disclosure;

Fig. 3 is a curve diagram of frequency modulation adaptive coefficient of wind storage coordinated control provided by an embodiment of the present disclosure;

Fig. 4 is a flow chart of another coordinated control method for wind storage primary frequency regulation control provided by an embodiment of the present disclosure;

Fig. 5 is a structural block diagram of a wind storage system primary frequency modulation coordination control device provided by an embodiment of the present disclosure;

Fig. 6 is a structural block diagram of a primary frequency modulation coordinated control system of a wind storage system provided by an embodiment of the present disclosure.

By means of the above-mentioned drawings, certain embodiments of the present disclosure have been shown and will be described in more detail hereinafter. These drawings and written description are not intended to limit the scope of the disclosed concept in any way, but to illustrate the disclosed concept for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to enable those skilled in the art to better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only It is an embodiment of a part of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present disclosure.

Terms used in the embodiments of the present disclosure are for the purpose of describing specific embodiments only, and are not intended to limit the present disclosure. The singular forms "a" and "the" used in the embodiments of the present disclosure are also intended to include plural forms unless the context clearly indicates otherwise.

It should be understood that the term "and/or" used herein is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which may mean that A exists alone, and A and B exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" could be interpreted as "when determined" or "in response to the determination" or "when detected (the stated condition or event) )" or "in response to detection of (a stated condition or event)".

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

The present disclosure is described in detail below in conjunction with accompanying drawing:

Referring to Fig. 1, in an embodiment of the present disclosure, in order to improve the coordination of wind storage system and the rationality of power distribution of multi-machine parallel energy storage power stations in the primary frequency regulation process of the wind storage system, a coordinated control of the primary frequency regulation of the wind storage system is provided The method uses energy storage technology to cooperate with wind power output, responds to the primary frequency regulation demand of the power grid, and improves the combined operation capacity of wind and storage. The primary frequency modulation coordinated control method of the wind storage system includes the following steps.

S1: Obtain the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system.

Wherein, the method for obtaining the frequency modulation power demand of the wind storage system includes: S11: obtaining the grid frequency of the grid-connected point of the wind storage system and the rated frequency of the grid; S12: when the grid frequency is within the preset frequency dead zone range, The frequency modulation power demand of the storage system is 0; S13: Otherwise, according to the frequency deviation between the grid frequency and the grid rated frequency, and the preset frequency modulation adaptive coefficient, the frequency modulation power demand of the wind storage system is obtained.

In some embodiments, the frequency of the grid connection point of the wind storage system is directly collected through the voltage transformer and the current transformer, so that a quick judgment can be made on the change of the grid frequency. Set the monitoring cycle of the grid frequency as T, and collect the grid frequency every T. At the same time, referring to Figure 2, set the frequency dead zone range of grid frequency regulation to [f _min , f _max ]. According to relevant standards, the frequency fluctuation dead zone is generally ±0.05; Limit value, when the grid frequency exceeds the set limit value range, the energy storage system will no longer respond to a frequency modulation. At the same time, for the wind storage system to respond to a frequency modulation, the frequency modulation power demand △P _f and the rated power P The ratio of _N is the active power limiting coefficient β, namely:

The limiting coefficient is set according to the actual situation and defined as β∈[β _min , β _max ]. According to the industry standard "DLT 1870-2018 Power System Network Source Coordination Technical Specifications", the maximum value of β is not less than 10%, for example It is set to 1% to 20%, that is, the ratio of the absolute value of the regulated active power variation △P _f to the rated power is within 1% to 20% to output the frequency modulation power.

Therefore, in order to prevent unnecessary frequency modulation responses, when the grid frequency is within the preset frequency dead zone, it is considered that frequency modulation is not currently required, that is, the frequency modulation power demand of the wind storage system is 0. When the grid frequency is outside the preset frequency dead zone range, the frequency deviation between the grid frequency and the grid rated frequency is obtained according to the acquired grid frequency and the grid rated frequency, and the frequency deviation and the preset frequency modulation self The adaptation coefficient is used to obtain the frequency modulation power demand of the wind storage system. In some embodiments, the frequency modulation power demand ΔP _f of the wind storage system is obtained by the following formula (1):

Among them, m is the preset frequency modulation adaptive coefficient; f _d represents the boundary value of the frequency dead zone range, namely: f _max and f _min represent the upper and lower boundaries of the frequency modulation dead zone; f represents the grid frequency.

In some embodiments of the present disclosure, referring to FIG. 3 , the preset FM adaptive coefficient includes several coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value, the boundary of the corresponding frequency deviation range The larger the value is; the method for obtaining the frequency modulation power demand of the wind storage system according to the frequency deviation between the grid frequency and the grid rated frequency and the preset frequency modulation adaptive coefficient includes: according to the frequency deviation between the grid frequency and the grid rated frequency For the frequency deviation range to which the frequency deviation belongs, the corresponding coefficient value is selected from the preset frequency modulation adaptive coefficients, and the frequency modulation power demand of the wind storage system is obtained according to the frequency deviation between the grid frequency and the grid rated frequency and the selected coefficient value. In this embodiment, two coefficient values are set, and _f1 and _f2 are used as distinguishing points. When the grid frequency is close to the frequency dead zone range, the coefficient value of the frequency modulation self-adaptive coefficient increases to accelerate frequency adjustment. Function, the frequency modulation adaptive coefficient can be adjusted according to the actual situation, f _m and f _n represent the upper and lower limits of frequency modulation respectively, when the grid frequency exceeds the limit value, the wind storage system will no longer increase the frequency modulation power.

In some embodiments of the present disclosure, in order to make each energy storage unit in the energy storage system have a better grid frequency modulation response, the SOC of each energy storage unit is restored to a reference value without requiring the energy storage system to perform frequency modulation SOC _b is called energy storage SOC autoregressive. Therefore, when the grid frequency is within the preset frequency dead zone range, it also includes: S14: Obtain the state of charge and rated power of the energy storage system; S15: According to the state of charge and rated power of the energy storage system, and the preset The set self-recovery coefficient and the preset return state of charge range, as well as the grid frequency and frequency dead zone range, the grid frequency includes the actual frequency of the grid and the rated frequency of the grid, and the return power of the energy storage system is obtained; S16: Get each energy storage unit According to the state of charge of the energy storage system and the state of charge of each energy storage unit, the return power of each energy storage unit is obtained. S17: Control each energy storage unit to perform energy storage return according to the return power of each energy storage unit , that is, SOC autoregressive. In this embodiment, the return power of the energy storage system is used as the frequency modulation power demand of the wind storage system, thus, the frequency modulation power demand of the wind storage system is updated by the following formula (2):

Among them, △P _adj is the return power of the energy storage system.

In some embodiments, ΔP _adj is determined according to the SOC of the energy storage system. Firstly, the SOC of the energy storage system is divided into SOC _min , SOC _l , SOC _b , SOC _h and SOC _max , which increase sequentially. When the system SOC is lower than SOC _l or higher than SOC _h , it is necessary to perform SOC self-recovery adjustment based on SOC _b , and the return power ΔP _adj of the energy storage system is expressed by the following formula (3):

Among them, α is the self-recovery coefficient, which can be set according to the actual situation; P _ESS,N is the rated power of the energy storage system.

In some embodiments of the present disclosure, in the case of SOC regression adjustment of the energy storage system, in order to reduce the large impact of the charging and discharging behavior of the energy storage system on the grid frequency of the grid-connected point during the SOC auto-regressive process of the energy storage system, that is, the The power grid frequency affects the fluctuation beyond the frequency dead zone range. Therefore, it is necessary to consider the power change boundary value that the power grid can withstand frequency fluctuation, including the power change boundary value of the frequency rise and the power change boundary value of the frequency drop.

In some embodiments, according to the grid frequency, the following formula (4) is used to determine the power change boundary value of the grid to withstand frequency drop

Among them, δ% is the difference rate of primary frequency regulation; f _N is the rated frequency of the power grid; f is the actual frequency of the power grid.

According to the frequency of the power grid, the power change boundary value of the power grid to withstand frequency rise is determined by the following formula (5):

At the same time, the return power needs to be adjusted to the smaller value of the power change boundary value of the power grid to withstand frequency fluctuations and the current return power, namely:

As indicated by the above formula (6), if the current regressive power is smaller than the power change boundary value of the grid to withstand frequency fluctuations, the adjusted regressive power is the current regressive power. If the current return power is larger than the power change boundary value of the grid to withstand frequency fluctuations, then the adjusted return power is the power change boundary value of the grid to withstand frequency fluctuations, then, according to the self-regression power of the energy storage system, calculate each energy storage The method of the regression power of the unit is expressed by the following formula (7):

Among them, △p _adj,i represents the autoregressive power of the i-th energy storage unit, and SOC _i represents the state of charge of the i-th energy storage unit.

S2: According to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system, the frequency modulation power demand of the energy storage system is obtained.

The 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 includes: according to the maximum frequency modulation power of the energy storage system, the minimum abandoned wind power of the wind power system in the wind storage system is The allocation principle is to allocate the frequency modulation power demand of the wind storage system, and in the case that the frequency modulation power demand of the wind storage system is reduced power, allocate the frequency modulation power demand of the wind power storage system to the wind power system, and obtain the frequency modulation power demand of the energy storage system.

In this embodiment, with the goal of reducing wind curtailment, the distribution result of the frequency modulation power demand of the wind storage system is calculated. Since most wind turbines are controlled according to the maximum wind energy capture, and wind turbines often adopt the maximum power point tracking (MPPT) control method, therefore, the response frequency drop of the wind turbine is not considered, and only when the SOC of each energy storage unit reaches the maximum value or the storage When the frequency modulation power of the system can respond to the maximum value and still does not meet the system frequency modulation power demand, the wind turbine abandonment is considered. The energy storage system responds to the primary frequency modulation power △P _{ESS, f} needs to satisfy the following formula (8):

Among them, △P _w,f represents the curtailed wind power of the wind power system in response to primary frequency regulation.

It is necessary to judge whether it is necessary to respond to frequency modulation by fan abandonment. The calculation method of △P _w,f is explained as follows:

(1) When the grid frequency exceeds the boundary of the frequency dead zone, that is, f>f _max , the power of the wind storage system needs to be reduced. If the energy storage system cannot be charged or the current available charging power △P _ESS cannot fully meet the frequency regulation power demand of the wind storage system, that is, SOC _ESS = SOC _max or |ΔP _ESS |<|ΔP _f |, the wind power system needs to abandon wind. When ΔP _w,f = ΔP _f - ΔP _ESS , where SOC _ESS represents the state of charge of the energy storage system.

(2) In the case that the energy storage system can fully meet the power requirements of primary frequency regulation, that is, |ΔP _ESS |≥|ΔP _f | and SOC _ESS <SOC _max , the wind power system does not need to participate in frequency regulation, and ΔP _w,f =0.

(3) When the grid frequency is lower than f _min and the wind storage system needs to generate additional power, the wind turbines of the wind power system do not have the ability to respond to primary frequency modulation because they are in the maximum power tracking mode, and △P _w,f =0.

S3: Obtain the current maximum frequency modulation power, state of charge and operating state of each energy storage unit in the energy storage system.

Wherein, the method for obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system includes: obtaining the current power and rated power of each energy storage unit in the energy storage system; according to the current power of each energy storage unit in the energy storage system and the rated power to obtain the current maximum frequency modulation power of each energy storage unit in the energy storage system.

In some embodiments, the current power and rated power of each energy storage unit in the energy storage system are obtained through the control system of the energy storage system.

Wherein, the running state includes a start-stop state, a discharge-allowed state and a charge-allowed state. In this embodiment, the PCS (Power Conversion System, energy storage converter) of each energy storage unit is used to describe the operating state, and the 0-1 representation of the start-stop state of the PCS of each energy storage unit is established. In the case of , the PCS starts, and in the case of a fault state, the PCS should be closed, and the start-stop status flag of the PCS is expressed as the following formula (9):

In order to protect each energy storage unit from not being overcharged or not being discharged, the discharge permission flag u _2,i and the charge permission flag u _3,i of the PCS of each energy storage unit are set respectively through the following formula (10) and formula (11 )express:

Among them, SOC _max and SOC _min are the upper and lower limits of the state of charge of each energy storage unit, SOC _i is the state of charge of the i-th energy storage unit, u _2,i is the PCS of the i-th energy storage unit The discharge permission flag, u _{3, i} is the charge permission flag of the PCS of the i-th energy storage unit.

S4: Obtain the frequency modulation power requirements of each energy storage unit according to the frequency modulation power requirements of the energy storage system, and the current maximum frequency modulation power, state of charge, and operating state of each energy storage unit.

Wherein, the method 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, state of charge and operation state of each energy storage unit includes: according to the frequency modulation power of the energy storage system Power demand, as well as the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, based on the allocation principle of the state of charge of each energy storage unit, allocate the frequency modulation power demand of the energy storage system, and obtain the energy storage unit’s FM power requirements.

In some embodiments, the frequency modulation power demand of the energy storage system participating in a frequency modulation needs to be allocated to each energy storage unit, and the state of charge of each energy storage unit is consistent by monitoring the PCS operating status and SOC of each energy storage unit For the allocation principle, the frequency modulation power demand △P _{ESS of each energy storage unit in response to frequency modulation is determined by the following formula, i} can be expressed by the following formula (12):

In some embodiments of the present disclosure, after obtaining the frequency modulation power requirements of each energy storage unit, it also includes: obtaining the current power and rated power of each energy storage unit; energy unit power constraints, and check the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; The frequency modulation power demand of the system, as well as the current maximum frequency modulation power, state of charge and modified operating state of each energy storage unit, based on the principle of consistent state of charge of each energy storage unit, redistribute the frequency modulation power demand of the energy storage system , and update the frequency modulation power demand of each energy storage unit according to the reallocation result.

In some embodiments, due to differences in the operating states of the energy storage units during actual operation, the failure of the battery cluster of the energy storage unit will cause the maximum power of the energy storage unit to change. test.

First, according to the initial power of each energy storage unit before participating in frequency regulation, the power constraint of the following formula (13) is set:

0≤|p _i |≤p _max,i ,p _max,i ＝p _N -|P _0,i | formula (13);

Among them, p _max,i represents the maximum power of the i-th energy storage unit in response to frequency modulation, and p _N represents the rated power of the energy storage unit.

The power calibration value SOP _i is obtained by the following formula (14):

That is, when the frequency modulation power demand of the energy storage unit reaches the maximum power that the energy storage unit can respond to frequency modulation, SOP _i =1, otherwise SOP _i =0.

In the case of p _ESS,i =0, the energy storage unit may be faulty, and its start-stop flag should be set to zero. The shortfall power is calculated by the following formula (15):

In the case of ΔP' _ESS ≠ 0, the flag bit is updated, and the frequency modulation power demand of the energy storage system is allocated again in the above-mentioned manner until the power constraints of each energy storage unit are met, that is,

as well as

any of the conditions.

Referring to Fig. 4, a simplified process of S1-S4 is shown. Firstly, step 401 is executed: parameter initialization, that is, to define the monitoring period of the grid frequency, the frequency dead zone range, the upper and lower limits of primary frequency regulation, and the active power limiting coefficient. Then execute step 402: obtain frequency modulation power demand, and execute step 403: determine whether wind turbines are required to participate, that is, whether wind power system is required to curtail wind. The maximum power of the system is the response to the frequency modulation power demand, and the remaining part is the frequency modulation power demand of the wind power system. In this case, the frequency modulation power demand of each energy storage unit is its maximum power in response to frequency modulation. In the case that no wind turbine is required, step 406 and step 407 are executed in sequence: the frequency modulation power demand is all responded by the energy storage system, and the energy storage system is allocated according to the state of charge of each energy storage unit. Frequency modulation power demand, and perform step 408 to solve the power calibration value of each energy storage unit. The power demand is verified to obtain the frequency modulation power demand of each energy storage unit. If the existing power verification value is not less than 1, it means that the frequency modulation power demand of the energy storage unit has not passed the verification, and it is necessary to perform step 409 to redistribute the frequency modulation power demand of each energy storage unit, and then perform step 410 to find out whether the shortage power is If it is 0, it ends when the default power is 0; otherwise, perform step 411 to solve the power verification value of each energy storage unit again, and repeat the above operation until the power verification values are all less than 1 or the default power is 0.

S5: Control each energy storage unit to perform a frequency modulation according to the frequency modulation power demand of each energy storage unit.

Wherein, the method for controlling each energy storage unit to perform frequency modulation according to the frequency modulation power demand of each energy storage unit includes: obtaining the current power of each energy storage unit, and superimposing the current power of each energy storage unit with the frequency modulation power demand of each energy storage unit to obtain The frequency modulation power of each energy storage unit is controlled to operate with the frequency modulation power of each energy storage unit.

In some embodiments, the frequency modulation power of each energy storage unit is obtained by superimposing the current power of each energy storage unit on the frequency modulation power demand of each energy storage unit. Such a setting allows the energy storage system to retain the existing The operating power does not affect the current function of the energy storage unit. For example, the energy storage system is responding to peak shaving and valley filling. Under such a setting, the energy storage system can respond to peak shaving and valley filling on one side, and a frequency modulation on the other.

In some embodiments of the present disclosure, the primary frequency modulation coordinated control method of the wind storage system further includes: 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; The frequency modulation power demand of the wind power system controls the wind power system to perform a frequency modulation.

Refer to the allocation process of the frequency modulation power demand of the wind storage system in S2 above. According to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system, the methods for obtaining the frequency modulation power demand of the wind power system in the wind storage system include: according to the energy storage system The maximum frequency modulation power of the system is allocated based on the minimum abandoned wind power of the wind power system in the wind storage system, and the frequency modulation power demand of the wind storage system is allocated. When the frequency modulation power demand of the wind storage system is reduced power, the wind power system is allocated The frequency modulation power demand of the wind storage system is obtained to obtain the frequency modulation power demand of the wind power system in the wind storage system.

In some embodiments, the method for controlling the wind power system to perform primary frequency modulation according to the frequency modulation power demand of the wind power system includes: obtaining the current power of the wind power system, superimposing the current power of the wind power system with the frequency modulation power demand of the wind power system, obtaining the frequency modulation power of the wind power system, and controlling the wind power system Run with the frequency modulation power of the wind power system.

To sum up, the primary frequency modulation coordination control method of the disclosed wind storage system realizes the distribution of the frequency modulation power demand of the wind power system and 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 wind power system can maximize the supply of clean energy power. At the same time, according to the frequency modulation power demand of the energy storage system, as well as the current maximum frequency modulation power, state of charge and operation status of each energy storage unit, the frequency modulation power demand of each energy storage unit is obtained. By comprehensively considering the current maximum frequency modulation power, state of charge and operating state, the reasonable distribution of frequency modulation power requirements of each energy storage unit in the energy storage system is realized, the consistency and controllability of each energy storage unit are improved, and the entire energy storage system is improved. The ability of the system to respond to a frequency modulation.

The following are device embodiments of the present disclosure, which can be used to implement the method embodiments of the present disclosure. It is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For details not omitted in the device embodiments, please refer to the description of the method embodiments of the present disclosure for understanding.

Referring to FIG. 5 , in yet another embodiment of the present disclosure, a primary frequency modulation coordinated control device for a wind storage system is provided, which can be configured to implement the above-mentioned primary frequency modulation coordinated control method for a wind storage system. In some embodiments, the primary frequency modulation of the wind storage system The frequency modulation coordination control device includes a first data acquisition module 51 , a first demand allocation module 52 , a second data acquisition module 53 , a second demand allocation module 54 and a first control module 55 .

Among them, the first data acquisition module 51 is configured to obtain the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system; the first demand distribution module 52 is configured to obtain the frequency modulation power demand of the wind storage system and the energy storage system The maximum frequency modulation power is to obtain the frequency modulation power demand of the energy storage system; the second data acquisition module 53 is configured to obtain the current maximum frequency modulation power, state of charge and operation state of each energy storage unit in the energy storage system; the second demand allocation module 54 configures In order to obtain the frequency modulation power requirements of each energy storage unit according to the frequency modulation power requirements of the energy storage system, and the current maximum frequency modulation power, state of charge, and operating state of each energy storage unit; the first control module 55 is configured to The frequency modulation power demand controls each energy storage unit to perform a frequency modulation.

In some embodiments of the present disclosure, the first data acquisition module 51 includes a wind storage demand acquisition module, and the wind storage demand acquisition module is configured to acquire the grid frequency and the grid rated frequency of the grid connection point of the wind storage system; In the case of the set frequency dead zone range, the frequency modulation power demand of the wind storage system is 0; otherwise, according to the frequency deviation between the grid frequency and the grid rated frequency, and the preset frequency modulation adaptive coefficient, the frequency modulation of the wind storage system is obtained power requirements.

In some embodiments of the present disclosure, the demand obtaining module of the wind storage system is further configured to obtain the state of charge and rated power of the energy storage system when the grid frequency is within a preset frequency dead zone range; The state of charge and rated power of the energy storage system, as well as the preset self-recovery coefficient and the preset return state of charge range, as well as the grid frequency and frequency dead zone range, can obtain the return power of the energy storage system; obtain the energy storage unit’s State of charge, according to the return power of the energy storage system and the state of charge of each energy storage unit, the return power of each energy storage unit is obtained; according to the return power of each energy storage unit, each energy storage unit is controlled to perform energy storage return.

In some embodiments of the present disclosure, the demand acquisition module of the wind storage system is further configured to obtain the boundary value of the power grid withstand power change, and update the return power of the energy storage system to the return power of the energy storage system and the grid withstand power The smaller of the varying boundary values.

In some embodiments of the present disclosure, the preset frequency modulation adaptive coefficient includes several coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value, the larger the boundary value of the corresponding frequency deviation range; The demand acquisition module of the wind storage system includes a demand calculation module of the wind storage system, and the demand calculation module of the wind storage system is configured to, according to the frequency deviation range to which the frequency deviation between the grid frequency and the grid rated frequency belongs, from the preset frequency modulation adaptive coefficient The corresponding coefficient value is selected in , and the frequency modulation power demand of the wind storage system is obtained according to the frequency deviation between the grid frequency and the rated frequency of the grid and the selected coefficient value.

In some embodiments of the present disclosure, the first demand allocation module 52 includes an energy storage demand allocation module, and the energy storage demand allocation module is configured to minimize the curtailed wind power of the wind power system in the wind storage system according to the maximum frequency regulation power of the energy storage system According to the allocation principle, the frequency modulation power demand of the wind storage system is allocated, and when the frequency modulation power demand of the wind storage system is reduced power, the frequency modulation power demand of the wind power storage system is allocated to the wind power system, and the frequency modulation power demand of the energy storage system is obtained.

In some embodiments of the present disclosure, the second data acquisition module 53 includes a power acquisition module and a maximum frequency modulation power acquisition module, and the power acquisition module is configured to acquire the current power and rated power of each energy storage unit in the energy storage system; the maximum The frequency modulation power acquisition module is configured to obtain the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and rated power of each energy storage unit in the energy storage system.

In some embodiments of the present disclosure, the second demand allocation module 54 includes an energy storage unit demand module, and the energy storage unit demand module is configured to be based on the frequency modulation power demand of the energy storage system and the current maximum frequency modulation power of each energy storage unit , state of charge and operating state, and use the consistency of the state of charge of each energy storage unit as the power allocation principle to allocate the frequency modulation power demand of the energy storage system, and obtain the frequency modulation power demand of each energy storage unit.

In some embodiments of the present disclosure, the second demand allocation module 54 further includes an energy storage unit verification module configured to acquire the current power and rated power of each energy storage unit; according to the current power of each energy storage unit and rated power to obtain the power constraints of each energy storage unit, and check the frequency modulation power requirements of each energy storage unit according to the power constraints of each energy storage unit; According to the frequency modulation power demand of the energy storage system, as well as the current maximum frequency modulation power, state of charge and modified operation state of each energy storage unit, the power allocation principle is based on the consistency of state of charge of each energy storage unit. Redistribute the frequency modulation power requirements of the energy storage system, and update the frequency modulation power requirements of each energy storage unit according to the redistribution results.

In some embodiments of the present disclosure, the first control module 55 includes an energy storage unit control module, and the energy storage unit control module is configured to obtain the current power of each energy storage unit, and the current power of each energy storage unit is superimposed on the power of each energy storage unit. According to the frequency modulation power demand, the frequency modulation power of each energy storage unit is obtained, and each energy storage unit is controlled to operate with the frequency modulation power of each energy storage unit.

In some embodiments of the present disclosure, the wind storage system primary frequency modulation coordination control device further includes a third demand allocation module and a second control module; the third demand allocation module is configured to The maximum frequency modulation power obtains the frequency modulation power demand of the wind power system in the wind storage system; the second control module is configured to control the wind power system to perform a frequency modulation according to the frequency modulation power demand of the wind power system.

In some embodiments of the present disclosure, the third demand allocation module includes a wind power demand allocation module, and the wind power demand allocation module is configured to allocate according to the maximum frequency modulation power of the energy storage system and the minimum abandoned wind power of the wind power system in the wind storage system , allocate the frequency modulation power demand of the wind storage system, and in the case that the frequency modulation power demand of the wind storage system is reduced power, allocate the frequency modulation power demand of the wind storage system to the wind power system, and obtain the frequency modulation power demand of the wind power system in the wind storage system.

In some embodiments of the present disclosure, the second control module includes a wind power system control module, the wind power system control module is configured to obtain the current power of the wind power system, and the current power of the wind power system is superimposed on the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system , to control the wind power system to run with the frequency modulation power of the wind power system.

Referring to FIG. 6 , in yet another embodiment of the present disclosure, there is provided a primary frequency modulation coordination control system for a wind storage system, including a data collection device 61 , a communication device 62 and the aforementioned wind storage system primary frequency modulation coordination control device 63 ; the data collection device 61 and the communication device 62 are all connected with the primary frequency modulation coordination control equipment 63 of the wind storage system; when in use, the data acquisition device 61 is connected to the grid-connected point 66 of the wind storage system, the wind power system control unit 641 in the wind storage system, and the energy storage in the wind storage system The system control unit 651 is connected, the communication device 62 is connected to the wind power system control unit 641 and the PCS of each energy storage unit 6511 in the energy storage system 65; the data acquisition device 61 is configured to collect the grid frequency of the grid connection point of the wind storage system, and The operating data of the wind power system 64 and the energy storage system 65 are sent to the primary frequency modulation coordination control device 63 of the wind storage system; the communication device 62 is configured as the primary frequency modulation coordination control device 63 of the wind storage system, the wind power system control unit 641 and each energy storage unit Data exchange between PCS of 6511.

In some embodiments, the primary frequency modulation coordination control device 63 of the wind storage system is arranged between the wind storage system and the grid, through the data acquisition device 61, such as PT (Potential Transformer, PT) or CT (Current Transformer, current transformer), The voltage of the grid-connected point 66 of the wind storage system is collected directly, and the system frequency and voltage are calculated. Connecting to the fast control network interconnected with the PCSs of each energy storage unit 6511 in the energy storage system 65 through the communication device 62, and obtaining the charging and discharging power commands currently executed by each PCS, the commands come from grid dispatching or on-site devices, Realize millisecond-level communication. Through the communication with the PCS of the energy storage unit 6511 and the wind turbine 6411EMP/VMP, the interaction of the real-time operation information of the wind storage system is realized, and the real-time data received are written into the real-time database of the system through the local area network point-to-point communication. Using the communication device 62, the issued frequency modulation power demand of the energy storage unit 6511 is delivered to the PCS of each energy storage unit 6511 through the fast channel, so as to realize the regulation and control function of the energy storage system 65.

In yet another embodiment of the present disclosure, a computer device is provided, the computer device includes a processor and a memory, the memory is configured to store a computer program, the computer program includes program instructions, and the processor is configured to execute the Program instructions stored on a computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable Gate array (Field-Programmable GateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, are suitable for implementing one or more instructions, and can It is suitable for loading and executing one or more instructions in the computer storage medium to realize the corresponding method flow or corresponding function; the processor described in the embodiment of the present disclosure can be used for the operation of the primary frequency modulation coordinated control method of the wind storage system.

It should be noted that, in the embodiment of the present disclosure, if the above-mentioned primary frequency modulation coordinated control method of the wind storage system is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable memory medium. Based on this understanding, the essence of the technical solutions of the embodiments of the present disclosure or the part that contributes to the related technologies can be embodied in the form of software products, the computer software products are stored in a storage medium, and include several instructions to make The electronic device executes all or part of the methods described in the various embodiments of the present disclosure. The aforementioned storage medium includes: various media that can store program codes such as U disk, mobile hard disk, read-only memory (Read Only Memory, ROM), magnetic disk or optical disk. As such, embodiments of the present disclosure are not limited to any specific combination of hardware and software.

Correspondingly, in yet another embodiment of the present disclosure, the present disclosure also provides a storage medium, which may be a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device configured to store programs and data. It can be understood that the computer-readable storage medium here may include a built-in storage medium in the computer device, and of course may also include an extended storage medium supported by the computer device. The computer-readable storage medium provides storage space, and the storage space stores the operating system of the terminal. Moreover, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory (Random Access Memory, random access memory), or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor, so as to realize the corresponding steps of the primary frequency modulation coordinated control method of the wind storage system in the above-mentioned embodiments.

An embodiment of the present disclosure also provides a computer program product, the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program enables the computer to execute any wind method described in the above-mentioned method embodiments. Part or all of the steps of the primary frequency modulation coordinated control method of the storage system.

Those skilled in the art should understand that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure 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, etc.) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them. Although the present disclosure has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present disclosure can still be Any modifications or equivalent replacements that do not depart from the spirit and scope of the present disclosure shall fall within the protection scope of the claims of the present disclosure.

Industrial Applicability

In the embodiment of the present disclosure, the frequency modulation power demand of the energy storage system can be determined according to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system. At the same time, according to the frequency modulation power demand of the energy storage system, and the energy storage unit According to the current maximum frequency modulation power, state of charge and operation state, the frequency modulation power demand of each energy storage unit is obtained. By comprehensively considering the current maximum frequency modulation power, state of charge and operation state, the frequency modulation of each energy storage unit in the energy storage system is realized. Reasonable allocation of power demand improves the consistency and controllability of each energy storage unit, thereby improving the ability of the entire energy storage system to respond to primary frequency modulation.

Claims (27)

1. A coordinated control method for primary frequency modulation of a wind storage system, comprising the following steps:

   Obtain the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system; the method for obtaining the frequency modulation power demand of the wind storage system includes:

   Obtain the grid frequency and grid rated frequency of the grid-connected point of the wind storage system;

   When the grid frequency is within the preset frequency dead zone range, the frequency regulation power demand of the wind storage system is 0;

   Otherwise, according to the frequency deviation between the grid frequency and the grid rated frequency, and the preset frequency modulation adaptive coefficient, the frequency modulation power demand of the wind storage system is obtained;

   In the case that the grid frequency is within the preset frequency dead zone range, it also includes:

   Obtain the state of charge and rated power of the energy storage system;

   According to the state of charge and rated power of the energy storage system, as well as the preset self-recovery coefficient and the preset return state of charge range, as well as the grid frequency and frequency dead zone range, the return power of the energy storage system is obtained;

   Obtain the state of charge of each energy storage unit, and obtain the return power of each energy storage unit according to the return power of the energy storage system and the state of charge of each energy storage unit;

   According to the return power of each energy storage unit, control each energy storage unit to perform energy storage return;

   According to the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system, the frequency modulation power demand of the energy storage system is obtained;

   Obtain the current maximum frequency modulation power, state of charge and operating state of each energy storage unit in the energy storage system;

   According to the frequency modulation power demand of the energy storage system, and the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, the frequency modulation power demand of each energy storage unit is obtained;

   Each energy storage unit is controlled to perform a frequency modulation according to the frequency modulation power demand of each energy storage unit.
2. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, wherein, after obtaining the returning power of the energy storage system, further comprising:

   Obtaining the boundary value of the grid's withstand power change, and updating the return power of the energy storage system to the smaller value of the energy storage system's return power and the boundary value of the grid's withstand power change.
3. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, wherein the preset frequency modulation adaptive coefficient includes several coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value, the corresponding The larger the boundary value of the frequency deviation range;

   The method for obtaining the frequency modulation power demand of the wind storage system according to the frequency deviation between the grid frequency and the grid rated frequency and the preset frequency modulation adaptive coefficient includes:

   According to the frequency deviation range of the frequency deviation between the grid frequency and the grid rated frequency, select the corresponding coefficient value from the preset frequency modulation adaptive coefficient, according to the frequency deviation between the grid frequency and the grid rated frequency and the selected coefficient value , to obtain the frequency modulation power demand of the wind storage system.
4. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, wherein the method of 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:

   According to the maximum frequency modulation power of the energy storage system and the minimum abandoned wind power of the wind power system in the wind storage system, the frequency modulation power demand of the wind storage system is allocated, and when the frequency modulation power demand of the wind storage system is reduced power, the wind power The system allocates the frequency modulation power demand of the wind storage system to obtain the frequency modulation power demand of the energy storage system.
5. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, wherein the method for obtaining the current maximum frequency modulation power of each energy storage unit in the energy storage system comprises:

   Obtain the current power and rated power of each energy storage unit in the energy storage system;

   According to the current power and rated power of each energy storage unit in the energy storage system, the current maximum frequency modulation power of each energy storage unit in the energy storage system is obtained.
6. The coordinated control method for primary frequency modulation of the wind storage system according to claim 1, wherein the operating state includes a start-stop state, a discharge-allowed state, and a charge-allowed state.
7. The primary frequency modulation coordination control method of the wind storage system according to claim 1, wherein, according to the frequency modulation power demand of the energy storage system, and the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, each energy storage unit is obtained Methods to tune the FM power requirements of the unit include:

   According to the frequency modulation power demand of the energy storage system, as well as the current maximum frequency modulation power, state of charge and operation state of each energy storage unit, the frequency modulation power of the energy storage system is allocated based on the principle of power allocation based on the consistency of the state of charge of each energy storage unit According to the demand, the frequency modulation power demand of each energy storage unit is obtained.
8. The primary frequency modulation coordinated control method of the wind storage system according to claim 7, wherein, after obtaining the frequency modulation power requirements of each energy storage unit, further comprising:

   Obtain the current power and rated power of each energy storage unit;

   According to the current power and rated power of each energy storage unit, the power constraints of each energy storage unit are obtained, and the frequency modulation power requirements of each energy storage unit are checked according to the power constraints of each energy storage unit;

   If the check fails, modify the operating status of the energy storage unit that has failed the check, and according to the frequency modulation power demand of the energy storage system, as well as the current maximum frequency modulation power of each energy storage unit, the state of charge and the modified In the operating state, the power allocation principle is based on the consistency of the state of charge of each energy storage unit, and the frequency modulation power demand of the energy storage system is redistributed, and the frequency modulation power demand of each energy storage unit is updated according to the redistribution results.
9. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, wherein the method of controlling each energy storage unit to perform primary frequency modulation according to the frequency modulation power demand of each energy storage unit comprises:

   Obtain the current power of each energy storage unit, add the current power of each energy storage unit to the frequency modulation power demand of each energy storage unit, obtain the frequency modulation power of each energy storage unit, and control each energy storage unit to operate with the frequency modulation power of each energy storage unit.
10. The primary frequency modulation coordinated control method of the wind storage system according to claim 1, further comprising: 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;

    According to the frequency modulation power demand of the wind power system, the wind power system is controlled to perform a frequency modulation.
11. The primary frequency modulation coordinated control method of the wind storage system according to claim 10, wherein the method of 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 :

    According to the maximum frequency modulation power of the energy storage system and the minimum abandoned wind power of the wind power system in the wind storage system, the frequency modulation power demand of the wind storage system is allocated, and when the frequency modulation power demand of the wind storage system is reduced power, the wind power The system allocates the frequency modulation power demand of the wind storage system, and obtains the frequency modulation power demand of the wind power system in the wind storage system.
12. The method for coordinating and controlling the primary frequency modulation of the wind storage system according to claim 10, wherein the method of controlling the wind power system to perform primary frequency modulation according to the frequency modulation power demand of the wind power system comprises:

    Obtain the current power of the wind power system, superimpose the current power of the wind power system on the frequency modulation power demand of the wind power system, obtain the frequency modulation power of the wind power system, and control the wind power system to operate with the frequency modulation power of the wind power system.
13. A primary frequency modulation coordinated control device for a wind storage system, comprising:

    The first data acquisition module is configured to acquire the frequency modulation power demand of the wind storage system and the maximum frequency modulation power of the energy storage system in the wind storage system;

    The first demand allocation module is configured to obtain 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 configured to acquire the current maximum frequency modulation power, charge state and operation state of each energy storage unit in the energy storage system;

    The second demand allocation module is configured to obtain 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, state of charge and operation state of each energy storage unit;

    The first control module is configured to control each energy storage unit to perform a frequency modulation according to the frequency modulation power demand of each energy storage unit;

    The first data acquisition module includes a wind storage demand acquisition module, and the wind storage demand acquisition module is configured to acquire the grid frequency and the grid rated frequency of the grid connection point of the wind storage system; when the grid frequency is within the preset frequency dead zone range , the frequency modulation power demand of the wind storage system is 0; otherwise, according to the frequency deviation between the grid frequency and the grid rated frequency, and the preset frequency modulation adaptive coefficient, the frequency modulation power demand of the wind storage system is obtained;

    The demand acquisition module of the wind storage system is also configured to obtain the state of charge and rated power of the energy storage system when the grid frequency is within the preset frequency dead zone range; according to the state of charge and rated power of the energy storage system , as well as the preset self-recovery coefficient and the preset return state of charge range, as well as the grid frequency and frequency dead zone range, to obtain the return power of the energy storage system; to obtain the state of charge of each energy storage unit, according to the energy storage system The regressed power and the state of charge of each energy storage unit are used to obtain the regressed power of each energy storage unit; according to the regressed power of each energy storage unit, each energy storage unit is controlled to perform energy storage reversion.
14. According to claim 13, the coordinated control device for primary frequency modulation of the wind storage system, wherein the demand acquisition module of the wind storage system is further configured to acquire the boundary value of power grid withstand power change, and update the return power of the energy storage system to the stored power The smaller value of the return power of the energy system and the boundary value of the power grid to withstand power changes.
15. The primary frequency modulation coordination control device of the wind storage system according to claim 13, wherein the preset frequency modulation adaptive coefficients include several coefficient values, one coefficient value corresponds to a frequency deviation range, and the larger the coefficient value, the corresponding The larger the boundary value of the frequency deviation range;

    The demand acquisition module of the wind storage system includes a demand calculation module of the wind storage system, and the demand calculation module of the wind storage system is configured to, according to the frequency deviation range to which the frequency deviation between the grid frequency and the grid rated frequency belongs, from the preset frequency modulation adaptive coefficient The corresponding coefficient value is selected in , and the frequency modulation power demand of the wind storage system is obtained according to the frequency deviation between the grid frequency and the rated frequency of the grid and the selected coefficient value.
16. The wind storage system primary frequency modulation coordination control device according to claim 13, wherein the first demand allocation module includes an energy storage demand allocation module, and the energy storage demand allocation module is configured to use wind storage The minimum abandoned wind power of the wind power system in the system is the allocation principle, and the frequency modulation power demand of the wind storage system is allocated, and when the frequency modulation power demand of the wind storage system is reduced power, the frequency modulation power demand of the wind storage system is allocated to the wind power system, and the obtained The frequency modulation power demand of the energy storage system.
17. According to claim 13, the coordinated control device for primary frequency modulation of the wind storage system, wherein, the second data acquisition module includes a power acquisition module and a maximum frequency modulation power acquisition module, and the power acquisition module is configured to acquire each energy storage unit in the energy storage system The current power and rated power of the energy storage system; the maximum frequency modulation power acquisition module is configured to obtain the current maximum frequency modulation power of each energy storage unit in the energy storage system according to the current power and rated power of each energy storage unit in the energy storage system.
18. The wind storage system primary frequency modulation coordination control device according to claim 13, wherein the second demand distribution module includes an energy storage unit demand module, and the energy storage unit demand module is configured to be based on the frequency modulation power demand of the energy storage system, and each The current maximum frequency modulation power, state of charge and operating state of the energy storage unit, based on the consistency of the state of charge of each energy storage unit as the power allocation principle, allocates the frequency modulation power demand of the energy storage system, and obtains the frequency modulation power demand of each energy storage unit .
19. According to the wind storage system primary frequency modulation coordination control device according to claim 18, wherein, the second demand distribution module further includes an energy storage unit verification module, and the energy storage unit verification module is configured to obtain the current power of each energy storage unit and Rated power: According to the current power and rated power of each energy storage unit, the power constraints of each energy storage unit are obtained, and the frequency modulation power requirements of each energy storage unit are checked according to the power constraints of each energy storage unit; if the check fails, Modify the running state of the energy storage unit that has not passed the check, and according to the frequency modulation power demand of the energy storage system, as well as the current maximum frequency modulation power, state of charge and the modified running state of each energy storage unit, use the frequency modulation power of each energy storage unit State of charge consistency is the principle of power allocation, redistribute the frequency modulation power requirements of the energy storage system, and update the frequency modulation power requirements of each energy storage unit according to the redistribution results.
20. According to claim 13, the coordinated control device for primary frequency modulation of the wind storage system, wherein the first control module includes an energy storage unit control module, and the energy storage unit control module is configured to obtain the current power of each energy storage unit, and each energy storage unit The current power is superimposed on the frequency modulation power demand 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 with the frequency modulation power of each energy storage unit.
21. The wind storage system primary frequency modulation coordinated control device according to claim 13, further comprising a third demand distribution module and a second control module;

    The third demand allocation module is configured to obtain 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; the second control module is configured to control the wind power according to the frequency modulation power demand of the wind power system The system performs a frequency modulation.
22. According to claim 13, the coordinated control device for primary frequency modulation of the wind storage system, wherein the third demand allocation module includes a wind power demand allocation module,

    The wind power demand allocation module is configured to allocate 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 abandoned wind power of the wind power system in the wind storage system, and the frequency modulation power demand of the wind storage system is to reduce the power In the case of , the frequency modulation power demand of the wind storage system is assigned to the wind power system, and the frequency modulation power demand of the wind power system in the wind storage system is obtained.
23. According to claim 13, the coordinated control device for primary frequency modulation of the wind storage system, wherein the second control module includes a wind power system control module,

    The wind power system control module is configured to obtain the current power of the wind power system, and the current power of the wind power system is superimposed on the frequency modulation power demand of the wind power system to obtain the frequency modulation power of the wind power system, and control the wind power system to operate with the frequency modulation power of the wind power system.
24. A primary frequency modulation coordinated control system of a wind storage system, comprising a data acquisition device, a communication device, and the primary frequency modulation coordination control device of the wind storage system according to any one of claims 13 to 23;

    Both the data acquisition device and the communication device are connected to the primary frequency modulation coordination control equipment of the wind storage system; when in use, the data acquisition device and the grid connection point of the wind storage system, the control unit of the wind power system in the wind storage system and the energy storage in the wind storage system The system control units are all connected, and the communication device is connected to the wind power system control unit and the energy storage converter PCS of each energy storage unit in the energy storage system;

    The data acquisition device is configured to collect the grid frequency of the grid-connected point of the wind storage system, as well as the operation data of the wind power system and the energy storage system, and send them to the primary frequency modulation coordination control equipment of the wind storage system;

    The communication device is configured as a data exchange between the primary frequency modulation coordination control equipment of the wind storage system, the control unit of the wind power system and the PCS of each energy storage unit.
25. A computer device, comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein when the processor executes the computer program, any of claims 1 to 12 is implemented. A step of the primary frequency modulation coordinated control method of the wind storage system.
26. A computer-readable storage medium, the computer-readable storage medium stores a computer program, wherein, when the computer program is executed by a processor, the coordinated control of primary frequency modulation of the wind storage system according to any one of claims 1 to 12 is realized method steps.
27. A computer program product, the computer program product includes one or more instructions, and the one or more instructions are suitable for being loaded by a processor and executing the primary frequency modulation of the wind storage system according to any one of claims 1 to 12 Coordinated control methods.

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