Frequency modulation control method and device of wind power generation system

Abstract

The invention relates to the technical field of new energy, in particular to a frequency modulation control method and device for a wind power generation system, and the method comprises the steps: obtaining a current power grid frequency; if the current power grid frequency is in the frequency allowed dead zone, generating a first operation strategy; if the current power grid frequency deviates from the frequency allowable dead zone, generating a second operation strategy which is used for coordinating and controlling the wind power generation system and the energy storage system, and correcting the frequency modulation power of the wind power generation system based on the active power instruction and the primary frequency modulation instruction; and controlling the wind power generation system according to the first operation strategy or the second operation strategy. Therefore, the problem that the wind power generation system cannot realize automatic frequency modulation along with the change of the frequency of the power system in the prior art is solved, so that the frequency characteristic and the power abrupt change anti-interference performance of the whole power system are improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a frequency modulation control method and device for a wind power generation system. Background Art

[0002] With the deepening reform of the new energy structure, new energy such as wind power generation and solar power generation accounts for an increasingly larger proportion in the installed power capacity. In the deployment of some power grids, new energy has gradually become the first choice. Therefore, when wind power generation is connected to the grid, power electronic equipment is mainly used. This has also led to the characteristics of power electronics and increasing access rates of new energy in the power system.

[0003] In the related technologies, since new energy power generation equipment including wind power cannot adjust frequency as the frequency changes, the frequency adjustment and anti-interference capabilities of the power system are reduced. Once the frequency of the power system changes frequently, it will have a direct impact on the safety and stability of operation; if new energy systems including wind turbines cannot achieve automatic frequency adjustment, as the proportion of new energy power generation installed capacity increases, it will affect the frequency characteristics of the entire power system and the anti-interference performance under power mutation conditions. Summary of the invention

[0004] The present application provides a frequency modulation control method and device for a wind power generation system to solve the problem that the wind power generation system cannot automatically adjust the frequency as the frequency of the power system changes, thereby improving the frequency characteristics and power mutation anti-interference performance of the entire power system.

[0005] A first aspect of the present application provides a frequency regulation control method for a wind power generation system, comprising the following steps: obtaining a current grid frequency; if the current grid frequency is in a frequency-allowed dead zone, generating a first operating strategy; if the current grid frequency deviates from the frequency-allowed dead zone, generating a second operating strategy according to the current grid frequency, wherein the second operating strategy is used to coordinate control of the wind power generation system and the energy storage system, and to correct the frequency regulation power of the wind power generation system based on an active power instruction and a primary frequency regulation instruction; and controlling the wind power generation system in accordance with the first operating strategy or the second operating strategy.

[0006] Optionally, generating a second operating strategy based on the current grid frequency includes: identifying an active power instruction generated by an automatic power generation control master station based on the current grid frequency and an active power adjustment amount in a primary frequency modulation instruction generated by a primary frequency modulation system based on the current grid frequency, as well as an order in which instructions are sent; correcting the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount; obtaining the maximum output power corresponding to the remaining capacity of the energy storage system; and generating a second operating strategy based on the frequency modulation power and the maximum output power.

[0007] Optionally, the correcting the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount includes: calculating the difference between the absolute values ​​of the active power instruction and the active power adjustment amount in the primary frequency modulation instruction; if the difference is greater than the adjustment difference threshold, calculating the active power loss of the wind power generation system; identifying the frequency modulation demand corresponding to the active power instruction and the primary frequency modulation instruction, determining the active power loss of the wind power generation system according to the order in which the instructions are sent, the difference and the positive and negative frequency modulation amount, and correcting the frequency modulation power of the wind power generation system according to the active power adjustment amount corresponding to the active power instruction, the active power adjustment amount corresponding to the primary frequency modulation instruction and the active power loss.

[0008] Optionally, the calculation of the active power loss of the wind power generation system includes: identifying the transmission current and transmission resistance of the main transformer, the transmission current, transmission resistance flow and power device losses and loss coefficient of the collector line in the wind power generation system; calculating the active power loss of the wind power generation system based on the transmission current and transmission resistance of the main transformer, the transmission current, transmission resistance flow and power device losses and loss coefficient of the collector line.

[0009] Optionally, generating a second operation strategy according to the frequency modulation power and the maximum output power includes:

[0010] If the frequency modulation power is less than or equal to the maximum output power corresponding to the remaining capacity of the energy storage system, the frequency modulation power is entirely borne by the remaining capacity of the energy storage system; if the frequency modulation power is greater than the maximum output power corresponding to the remaining capacity of the energy storage system, the remaining frequency modulation power is borne by each wind turbine in the wind power generation system on the basis of maximizing the output of the remaining capacity of the energy storage system.

[0011] The second aspect of the present application provides a frequency regulation control device for a wind power generation system, comprising: a processor, for executing a program stored on a storage medium, so as to implement the frequency regulation control method for a wind power generation system as described in the above embodiment; the storage medium, comprising: a non-volatile memory and a volatile memory, wherein the non-volatile memory is used to store programs and data; the volatile memory is used to temporarily store data; the program comprises: a user interface module, a data processing module and a storage management module; wherein the user interface module is used to interact with the user; the data processing module is used to process input data and generate output results; the storage management module is used to manage data storage and retrieval on the storage medium; wherein the program is executed by the processor to implement the following functions: receiving user input; calling the data processing module to process input data; storing the processing results on the storage medium; and displaying the processing results to the user through the user interface module.

[0012] Therefore, this application has at least the following beneficial effects:

[0013] (1) The embodiment of the present application improves the method based on the existing wind power generation system control technology, and calls different control strategies according to the real-time monitoring results of the power grid frequency. When the power grid frequency is in the frequency allowable dead zone, the wind power generation system operates normally. When the power grid frequency deviates from the frequency allowable dead zone, the wind power generation system operates according to the coordinated control strategy based on the current power grid frequency, so as to realize automatic frequency adjustment of the new energy system as the power system frequency fluctuates.

[0014] (2) In the embodiment of the present application, when the grid frequency exceeds the allowable frequency dead zone, a coordinated control strategy is used to realize the joint participation of the wind power generation system and the energy storage system in frequency regulation, so that the wind power generation system and the energy storage system can perform joint automatic frequency regulation as the power system frequency fluctuates, with the goal of maximizing the output of the remaining capacity of the energy storage system, thereby improving the economic efficiency of the energy storage system participating in frequency regulation.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A flow chart of a frequency modulation control method for a wind power generation system provided according to an embodiment of the present application;

[0018] Figure 2 Schematic diagram of the structure of a frequency modulation control device of a wind power generation system according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0020] The frequency modulation control method and device of the wind power generation system of the embodiment of the present application are described below with reference to the accompanying drawings. In view of the problem that the power generation equipment in the related technology mentioned in the above background technology cannot realize automatic frequency modulation as the frequency of the power system changes, thereby affecting the frequency characteristics of the entire power system and the anti-interference performance in the case of power mutation, the present application provides a frequency modulation control method for a wind power generation system, in which the method is improved based on the existing wind power generation system frequency modulation control technology, and different control strategies are called according to the real-time monitoring results of the power grid frequency. When the power grid frequency is in the frequency allowable dead zone, the wind power generation system operates normally. When the power grid frequency deviates from the frequency allowable dead zone, the wind power generation system operates according to the coordinated control strategy based on the current power grid frequency, so that the wind power generation system can automatically adjust the frequency as the power system frequency fluctuates. As a result, the problem that the wind power generation system in the related technology cannot realize automatic frequency modulation as the power system frequency changes is solved, thereby improving the frequency characteristics and power mutation anti-interference performance of the entire power system.

[0021] Specifically, Figure 1 A flow chart of a frequency modulation control method for a wind power generation system provided in an embodiment of the present application.

[0022] like Figure 1 As shown, the frequency modulation control method of the wind power generation system includes the following steps:

[0023] In step S101, the current grid frequency is obtained.

[0024] It is understandable that the embodiments of the present application can obtain the current grid frequency through real-time monitoring and generate a corresponding operation strategy according to the current grid frequency.

[0025] In step S102, if the current grid frequency is within the permitted frequency dead zone, a first operation strategy is generated.

[0026] Among them, the first operation strategy can be normal operation, that is, real-time monitoring of the operating frequency of the power grid and analysis of the trend, cause and possible development status of frequency fluctuations, etc., without specific limitation.

[0027] It can be understood that when the current grid frequency is in the allowed frequency dead zone, the embodiment of the present application generates a first operating strategy to monitor the fluctuation of the grid in real time, maintain the stable operation state of the grid, and prevent the frequency fluctuation from exceeding the safety limit.

[0028] It should be noted that the allowable frequency dead zone refers to a smaller frequency change range set during the operation of the power system to avoid frequent initiation of frequency regulation measures due to slight frequency fluctuations. Within this range, the frequency is considered to be still within the allowable normal range, and no or less frequency regulation action is required. It is used to balance the sensitivity and stability of system regulation, which can reduce unnecessary frequency regulation operations, reduce system operating costs, avoid the risk of system oscillations caused by frequent adjustments, improve system stability and efficiency, and ensure power supply quality.

[0029] In step S103, if the current grid frequency deviates from the frequency allowable dead zone, a second operating strategy is generated according to the current grid frequency, wherein the second operating strategy is used to coordinate the control of the wind power generation system and the energy storage system, and correct the frequency modulation power of the wind power generation system based on the active power instruction and the primary frequency modulation instruction.

[0030] It can be understood that in the embodiment of the present application, if the current grid frequency deviates from the allowable frequency dead zone, the wind power generation system and the energy storage system can jointly participate in frequency regulation through a coordinated control strategy, and the wind power generation system operates according to the coordinated control strategy to achieve automatic frequency regulation of the new energy system as the power system frequency fluctuates.

[0031] In an embodiment of the present application, a second operating strategy is generated according to the current grid frequency, including: identifying the active power instruction generated by the automatic power generation control master station according to the current grid frequency and the active power adjustment amount in the primary frequency modulation instruction generated by the primary frequency modulation system according to the current grid frequency, as well as the order in which the instructions are sent; correcting the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount; obtaining the maximum output power corresponding to the remaining capacity of the energy storage system; and generating the second operating strategy according to the frequency modulation power and the maximum output power.

[0032] It can be understood that the embodiments of the present application can correct the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount, so as to realize the joint automatic frequency adjustment of the new energy system and the energy storage system as the frequency of the power system fluctuates, and realize the goal of maximizing the output of the remaining capacity of the energy storage system, thereby improving the economy of the energy storage system participating in frequency modulation.

[0033] It should be noted that the active power command is the active power adjustment value P obtained by the automatic generation control master station AGC based on the current grid frequency. a The primary frequency regulation instruction is the active power adjustment value P obtained by the primary frequency regulation system in the wind power plant according to the current grid frequency. b .

[0034] In an embodiment of the present application, the frequency modulation power of the wind power generation system is corrected according to the order in which instructions are sent and the active power adjustment amount, including: calculating the difference between the absolute values ​​of the active power instruction and the active power adjustment amount in the primary frequency modulation instruction; if the difference is greater than the adjustment difference threshold, calculating the active power loss of the wind power generation system; identifying the frequency modulation demand corresponding to the active power instruction and the primary frequency modulation instruction, and determining the use of the active power loss of the wind power generation system, the active power adjustment amount corresponding to the active power instruction, and the active power adjustment amount corresponding to the primary frequency modulation instruction to correct the frequency modulation power of the wind power generation system according to the order in which instructions are sent, the difference, and the positive and negative frequency modulation amount.

[0035] Among them, the adjustment difference threshold can be set according to actual needs without specific limitation; the frequency regulation demand can be based on the positive or negative value of the active power instruction generated by the current grid frequency and the adjustment amount of the primary frequency regulation instruction. For example: if the current grid frequency is lower than the allowable frequency dead zone, the frequency regulation power needs to be increased, and the adjustment amount is a positive value.

[0036] It can be understood that the embodiments of the present application can determine the frequency modulation power of the wind power generation system by utilizing the active power loss of the wind power generation system, the active power adjustment amount corresponding to the active power instruction, and the active power adjustment amount corresponding to the primary frequency modulation instruction according to the order in which the instructions are sent, the difference, and the positive and negative frequency modulation amount, so as to realize the joint automatic frequency regulation of the new energy system and the energy storage system as the frequency of the power system fluctuates.

[0037] It should be noted that, according to the order of command sending, the difference and the positive and negative frequency modulation amount, the present application determines the use of the active power loss of the wind power generation system, the active power adjustment amount corresponding to the active power command and the active power adjustment amount corresponding to the primary frequency modulation command to correct the frequency modulation power of the wind power generation system. There are multiple ways, as follows:

[0038] As a possible implementation method, if △P is greater than △P y Adjust the difference threshold, then correct the active power adjustment amount P b = Active power adjustment P b +P 损 Otherwise, determine the order of the active power command and the primary frequency modulation power command: if the active power command precedes the primary frequency modulation power command, the frequency modulation power P c =P a +P b =P a +P b +P 损 Otherwise, if the active power command and the primary frequency modulation power command are one positive and one negative, the frequency modulation power P c =P a If the active power command and the primary frequency modulation power command are both positive or both negative, the frequency modulation power P c =Pa +P b =P a +P b +P 损 .

[0039] As another possible implementation method, when both conditions 1 and 4 are met, the frequency modulation power P c =P a +P b +P 损 ;

[0040] When both condition 1 and condition 5 are met, the frequency modulation power P c =P a +P b +P 损 ;

[0041] When conditions 1, 3 and 7 are met at the same time, the frequency modulation power P c =P a +P b ;

[0042] When conditions 1, 3 and 6 are met at the same time, the frequency modulation power P c =P a +P b ;

[0043] When conditions 2, 3 and 4 are met at the same time, the frequency modulation power P c =P a +P 损 ;

[0044] When conditions 2, 3 and 5 are met at the same time, the frequency modulation power P c =P a +P 损 ;

[0045] When conditions 2 and 6 are met at the same time, the frequency modulation power P c =P a +P b ;

[0046] When conditions 2 and 7 are met at the same time, the frequency modulation power P c =P a +P b ;

[0047] The corresponding conditions are as follows:

[0048] Condition 1: The active power command precedes the primary frequency modulation power command;

[0049] Condition 2: The primary frequency modulation power command precedes the active power command;

[0050] Condition 3: △P is greater than △P y Adjust the difference threshold;

[0051] Condition 4: The active power command is negative and the primary frequency modulation power command is positive;

[0052] Condition 5: The active power command is positive and the primary frequency modulation power command is negative;

[0053] Condition 6: Both the active power command and the primary frequency modulation power command are positive;

[0054] Condition 7: Both the active power command and the primary frequency modulation power command are negative.

[0055] It should be noted that after the present application performs safety logic judgment on the active power instruction and the primary frequency modulation power instruction, the active power instruction and the primary frequency modulation power instruction have corresponding coordination logic when they are effective at the same time, so that the primary frequency modulation control performance of the wind farm station is improved, and the effective safety of the active power instruction and the primary frequency modulation power instruction is guaranteed.

[0056] Specifically, the active power adjustment amount obtained by the primary frequency regulation system is corrected based on the active power loss in the wind power plant. In principle, the correction amount should offset the loss between the wind turbine cluster and the grid connection point (transformer or switch station), mainly including the wind power plant collection line loss, the active power loss of the transformer, etc., to ensure that the active power of the entire field can be stabilized near the theoretical power point corresponding to the grid frequency after adjustment, thereby improving the control effect of frequency regulation.

[0057] In an embodiment of the present application, the active power loss of a wind power generation system is calculated, including: identifying the transmission current and transmission resistance of a main transformer in the wind power generation system, the transmission current, transmission resistance flow and power device losses and a loss coefficient of a collector line; calculating the active power loss of the wind power generation system based on the transmission current and transmission resistance of the main transformer, the transmission current, transmission resistance flow and power device losses and a loss coefficient of the collector line.

[0058] It can be understood that the embodiments of the present application can calculate the active power loss of the wind power generation system based on the transmission current and transmission resistance of the main transformer, the transmission current and transmission resistance of the collector line, the power device loss and the loss coefficient, so as to selectively correct the primary frequency modulation instruction using the active power loss.

[0059] Specifically, if △P is greater than △P y Adjust the difference threshold, then correct the active power adjustment amount P b = Active power adjustment P b +P 损 , where P 损 The calculation formula is:

[0060]

[0061] Among them, I B is the transmission current of the main transformer in the wind power plant, R B is the transmission resistance of the main transformer in the wind power plant; I li is the transmission current of the wind power plant station collector line i, R li is the transmission resistance current of the wind power plant station collector line i, P z is the power device loss on the collector circuit in the wind power plant, K represents the loss coefficient, K∈(1.1, 1.4).

[0062] In an embodiment of the present application, a second operating strategy is generated based on the frequency modulation power and the maximum output power, including: if the frequency modulation power is less than or equal to the maximum output power corresponding to the remaining capacity of the energy storage system, the frequency modulation power is entirely borne by the remaining capacity of the energy storage system; if the frequency modulation power is greater than the maximum output power corresponding to the remaining capacity of the energy storage system, the remaining frequency modulation power is borne by each wind turbine in the wind power generation system on the basis of maximizing the output of the remaining capacity of the energy storage system.

[0063] It can be understood that the embodiments of the present application can achieve the goal of maximizing the output of the remaining capacity of the energy storage system, thereby improving the economic efficiency of energy storage participating in frequency regulation.

[0064] Specifically, the required frequency modulation power P is calculated according to the following formula: c Distributed to the energy storage system and each wind turbine in the wind power plant,

[0065]

[0066] Where Pe is the frequency modulation power that the energy storage system needs to output, Pemax is the maximum frequency modulation power that the energy storage system can output, j is the total number of wind turbines in the wind power plant, P fj is the frequency modulation power required to be output by wind turbine group j. When Pc>Q, short-term power peaks such as virtual inertia are borne by the wind turbine, and the steady-state power required for frequency modulation is borne by the energy storage system.

[0067] In step S104, the wind power generation system is controlled according to the first operation strategy or the second operation strategy.

[0068] It can be understood that the embodiments of the present application can control the wind power generation system according to the first operating strategy or the second operating strategy, so as to realize automatic frequency adjustment of the new energy system as the frequency of the power system fluctuates, thereby improving the safety and stability of the power grid operation.

[0069] According to the frequency regulation control method of the wind power generation system proposed in the embodiment of the present application, if the current grid frequency is in the allowable frequency dead zone, a first operation strategy is generated to monitor the fluctuation of the grid in real time, maintain the stable operation state of the grid, and prevent the frequency fluctuation from exceeding the safety limit. If the current grid frequency deviates from the allowable frequency dead zone, the wind power generation system and the energy storage system are jointly involved in the frequency regulation through a coordinated control strategy, and the wind power generation system operates according to the coordinated control strategy, so that the new energy system can automatically adjust the frequency as the power system frequency fluctuates, thereby improving the safety and stability of the grid operation.

[0070] Figure 2 A schematic diagram of the structure of a frequency modulation control device for a wind power generation system provided in an embodiment of the present application. The frequency modulation control device 10 for a wind power generation system may include: a processor 201 , a storage medium 202 and a program 203 .

[0071] Among them, the processor 201 is used to execute the program 203 stored on the storage medium 202 to implement the frequency modulation control method of the wind power generation system as in the above-mentioned embodiment; the storage medium 202 includes: a non-volatile memory and a volatile memory; wherein the non-volatile memory is used to store programs and data; the volatile memory is used to temporarily store data; the program 203 includes: a user interface module, a data processing module and a storage management module; wherein the user interface module is used to interact with the user; the data processing module is used to process input data and generate output results; the storage management module is used to manage data storage and retrieval on the storage medium; wherein the program 203 is executed by the processor to implement the following functions: receiving user input; calling the data processing module to process input data; storing the processing results on the storage medium; and displaying the processing results to the user through the user interface module.

[0072] Furthermore, the processor 201 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, capable of running pre-written software programs, which are used to control and monitor the operating status of the wind power generation system.

[0073] Furthermore, the non-volatile memory (such as flash memory) in the storage medium 202 is used to permanently store program codes and important settings or historical data; the volatile memory (such as RAM) is used to temporarily store data being processed and intermediate results, as well as the operating system and other information required during operation.

[0074] Furthermore, program 203 includes: a user interface module, a data processing module and a storage management module; wherein the user interface module allows operators to interact with the system, can display real-time data, warning information, and accept instructions from users; the data processing module is responsible for analyzing sensor data, such as wind speed, generator speed, power output, etc., and then calculating the best control strategy, such as adjusting the blade angle or changing the load of the generator; the storage management module ensures the correct storage and retrieval of data, which includes functions such as logging, data backup and recovery.

[0075] Furthermore, the frequency modulation control device 10 of the wind power generation system further includes:

[0076] A communication interface is used for communication between the storage medium 202 and the processor 201 .

[0077] The storage medium 202 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage.

[0078] If the storage medium 202, the processor 201 and the communication interface are implemented independently, the communication interface, the storage medium 202 and the processor 201 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0079] Optionally, in a specific implementation, if the storage medium 202, the processor 201 and the communication interface are integrated on a chip, the storage medium 202, the processor 201 and the communication interface can communicate with each other through an internal interface.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0083] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0084] A person skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0085] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A frequency modulation control method for a wind power generation system, characterized in that: The following steps are involved: Get the current grid frequency; If the current grid frequency is within the frequency allowable dead zone, generating a first operation strategy; If the current grid frequency deviates from the frequency allowable dead zone, a second operation strategy is generated, wherein the second operation strategy is used to coordinate and control the wind power generation system and the energy storage system, and to correct the frequency modulation power of the wind power generation system based on the active power instruction and the primary frequency modulation instruction; The wind power generation system is controlled according to the first operation strategy or the second operation strategy.

2. The frequency modulation control method of a wind power generation system according to claim 1, characterized in that: The generating a second operation strategy according to the current grid frequency comprises: Identify the active power adjustment amount in the active power command generated by the automatic generation control master station and the primary frequency regulation command generated by the primary frequency regulation system, as well as the order in which the commands are sent; Correcting the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount; Obtaining the maximum output power corresponding to the remaining capacity of the energy storage system; and generating a second operation strategy according to the frequency modulation power and the maximum output power corresponding to the remaining capacity of the energy storage system.

3. The frequency modulation control method of a wind power generation system according to claim 2, characterized in that: The step of correcting the frequency modulation power of the wind power generation system according to the order in which the instructions are sent and the active power adjustment amount comprises: Calculating the difference between the absolute value of the active power adjustment amount in the active power instruction and the primary frequency modulation instruction; If the difference is greater than the adjustment difference threshold, then calculating the active power loss of the wind power generation system; Identify the frequency modulation requirements corresponding to the active power instruction and the primary frequency modulation instruction, determine the active power loss of the wind power generation system according to the order in which the instructions are sent, the difference and the positive and negative sign of the frequency modulation amount, and correct the frequency modulation power of the wind power generation system according to the active power adjustment amount corresponding to the active power instruction, the active power adjustment amount corresponding to the primary frequency modulation instruction and the active power loss.

4. The frequency modulation control method of a wind power generation system according to claim 3, characterized in that: The calculating of active power loss of the wind power generation system comprises: Identify the transmission current and transmission resistance of the main transformer, the transmission current and transmission resistance of the collector line, and the power device loss and loss coefficient of the main transformer in the wind power generation system; The active power loss of the wind power generation system is calculated according to the transmission current and the transmission resistance of the main transformer, the transmission current and the transmission resistance of the collector line, the power device loss and the loss coefficient.

5. The frequency modulation control method of a wind power generation system according to claim 2, characterized in that: The generating a second operation strategy according to the maximum output power corresponding to the frequency modulation power and the remaining capacity of the energy storage system includes: If the frequency modulation power is less than or equal to the maximum output power corresponding to the remaining capacity of the energy storage system, the frequency modulation power is entirely borne by the remaining capacity of the energy storage system; If the frequency modulation power is greater than the maximum output power corresponding to the remaining capacity of the energy storage system, the remaining frequency modulation power is borne by each wind turbine in the wind power generation system on the basis of maximizing the output of the remaining capacity of the energy storage system.

6. A frequency modulation control device for a wind power generation system, characterized in that: include: A processor, configured to execute a program stored in a storage medium to implement the frequency modulation control method for a wind power generation system according to any one of claims 1 to 5; The storage medium includes: a non-volatile memory and a volatile memory, wherein the non-volatile memory is used to store programs and data; the volatile memory is used to temporarily store data; The program includes: a user interface module, a data processing module and a storage management module; wherein the user interface module is used to interact with the user; the data processing module is used to process input data and generate output results; the storage management module is used to manage the storage and retrieval of data on the storage medium; The program is executed by the processor to implement the following functions: receiving user input; calling the data processing module to process the input data; storing the processing results on a storage medium; and displaying the processing results to the user through the user interface module.

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