Wind power plant frequency adjusting method, device, equipment and storage medium

Abstract

The invention discloses a wind power plant frequency regulation method, device and equipment and a storage medium, and relates to the technical field of power grid frequency regulation, and the method comprises the steps: determining the frequency deviation value of a wind power plant grid connection point and the total frequency modulation power of the whole plant according to the periodic sampling information of the wind power plant grid connection point; determining a frequency modulation direction corresponding to primary frequency modulation according to the frequency deviation value; performing amplitude limiting processing on the full-field total frequency modulation power based on the frequency modulation direction to obtain an amplitude-limited full-field frequency modulation power instruction; distributing the amplitude-limited full-field frequency modulation power instruction to each fan in a wind power plant grid-connected point based on a frequency modulation strategy; and controlling the fan to execute the amplitude-limited full-field frequency modulation power instruction, and controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy. According to the technical scheme, the technical problem that in the prior art, only an FFR power source can be provided by controlling kinetic energy release of a rotor of a draught fan during frequency modulation of a wind power plant, and stable primary frequency modulation capacity cannot be provided, so that the frequency modulation effect is poor is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power grid frequency regulation, and in particular to a wind farm frequency regulation method, device, equipment and storage medium. Background Art

[0002] Frequency regulation is the basis for the real-time balance of power in the power system. When the AC power grid is in operation, it is necessary to maintain a constant AC frequency (such as 50Hz). The change of the grid frequency is closely related to the real-time balance of power generation and power consumption. By maintaining the grid frequency at the rated value, the real-time power generation and power consumption balance of the power system can be guaranteed. Among them, wind farm fast frequency regulation refers to a second-level active frequency regulation function that combines primary frequency regulation and fast frequency response (FFR) characteristics provided to the power system based on the technical characteristics of wind power generation itself.

[0003] The key issue for wind farms to provide primary frequency regulation and FFR functions is the source of additional power, especially when the output power needs to be increased for upward regulation. Considering the economic efficiency, the additional power can currently be derived from the release of wind turbine rotor kinetic energy. However, by controlling the release of wind turbine rotor kinetic energy, only the FFR power source can be provided, but stable primary frequency regulation capability cannot be provided, resulting in poor frequency regulation effect.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a wind farm frequency regulation method, device, equipment and storage medium, aiming to solve the technical problem in the prior art that when the wind farm frequency is modulated, only an FFR power source can be provided by controlling the rotor kinetic energy release of the wind turbine, but a stable primary frequency regulation capability cannot be provided, resulting in poor frequency regulation effect.

[0006] To achieve the above objectives, the present application proposes a wind farm frequency regulation method, the method comprising: Determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point; Determine a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value; Based on the frequency modulation direction, the total frequency modulation power of the whole field is limited to obtain the full-field frequency modulation power instruction after limiting; Allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction; The fan is controlled to execute the full-field frequency modulation power instruction after the limit, and the fan is controlled to perform rotor kinetic energy control according to the frequency modulation strategy.

[0007] In one embodiment, the step of determining the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the entire wind farm grid connection point according to the periodic sampling information of the wind farm grid connection point includes: Determine the current frequency measurement value based on the periodic sampling information of the wind farm grid connection point; Determining a frequency deviation value of the wind farm grid connection point according to the current frequency measurement value and a preset rated frequency value; When the frequency deviation value exceeds the dead zone range, the frequency deviation value is input into the proportional gain channel and the differential gain channel respectively to obtain the proportional gain result and the differential gain result; The total frequency modulation power of the wind farm grid connection point is determined based on the proportional gain result and the differential gain result.

[0008] In one embodiment, the frequency modulation direction includes: downward modulation and upward modulation; the step of determining the frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value includes: Determining whether the frequency deviation value exceeds a target value; If yes, the frequency modulation direction corresponding to the first frequency modulation is determined as downward modulation; Or, if not, the frequency modulation direction corresponding to the first frequency modulation is determined as upward modulation.

[0009] In one embodiment, before the step of performing a limiting process on the total frequency modulation power of the entire field based on the frequency modulation direction to obtain the full-field frequency modulation power instruction after limiting, the step further includes: Obtain the measured speed, minimum speed, FFR control duration and unit moment of inertia of the target wind turbine at the wind farm grid connection point; Determine an adjustable power increase margin of the target wind turbine when the target wind turbine decreases from the measured speed to the minimum speed based on the measured speed, the minimum speed, the FFR control duration, and the unit rotational inertia; Determining an adjustable margin of rotor kinetic energy release for the entire wind farm corresponding to the wind farm grid connection point based on the adjustable power increase margin; The step of performing a limiting process on the total frequency modulation power of the entire field based on the frequency modulation direction to obtain a limited total frequency modulation power instruction of the entire field comprises: The total frequency modulation power of the entire field is limited based on the frequency modulation direction and the adjustable margin of the release of the kinetic energy of the entire field rotor, so as to obtain the limited total frequency modulation power instruction of the entire field.

[0010] In one embodiment, the step of limiting the total frequency modulation power of the whole field based on the frequency modulation direction and the adjustable margin of the whole field rotor kinetic energy release to obtain the full field frequency modulation power instruction after limiting includes: If the frequency modulation direction is upward adjustment, the total frequency modulation power of the whole field is limited based on the full-field power increase limit and the full-field rotor kinetic energy release adjustable margin to obtain the full-field frequency modulation power instruction after limiting; Or, if the frequency modulation direction is downward adjustment, the total frequency modulation power of the entire field is limited based on the full-field power reduction limit to obtain the full-field frequency modulation power instruction after limiting.

[0011] In one embodiment, the frequency regulation strategy includes: a power reduction regulation strategy; the step of allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the frequency regulation strategy includes: When the frequency regulation strategy is the power reduction regulation strategy, determining a first frequency regulation power allocation weight according to the real-time output power proportion of each wind turbine in the wind farm grid connection point; Allocating the limited full-field frequency modulation power instruction to each wind turbine in the wind farm grid connection point based on the first frequency modulation power allocation weight; The step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: The wind turbine is controlled to perform pitch control and rotor kinetic energy absorption control according to the power reduction regulation strategy.

[0012] In one embodiment, the frequency regulation strategy includes: a power increase regulation strategy; the step of allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the frequency regulation strategy includes: When the frequency regulation strategy is the power increase regulation strategy, determining the second frequency regulation power allocation weight according to the proportion of the releasable power of the rotor kinetic energy of each wind turbine in the wind farm grid connection point; Allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the second frequency regulation power allocation weight; The step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: The wind turbine is controlled to perform pitch control and rotor kinetic energy release control according to the power increase regulation strategy.

[0013] In addition, to achieve the above purpose, the present application also proposes a wind farm frequency adjustment device, the device comprising: A power determination module, used to determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point; A frequency modulation direction determination module, used to determine a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value, wherein the frequency modulation direction includes downward adjustment and upward adjustment; A limiting processing module is used to perform limiting processing on the total frequency modulation power of the whole field based on the frequency modulation direction to obtain a full-field frequency modulation power instruction after limiting; An instruction distribution module, used for distributing the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction; The rotor kinetic energy control module is used to control the fan to execute the full-field frequency modulation power instruction after the limit, and control the fan to perform rotor kinetic energy control according to the frequency modulation strategy.

[0014] In addition, to achieve the above objectives, the present application also proposes a wind farm frequency regulation device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the wind farm frequency regulation method as described above.

[0015] In addition, to achieve the above objectives, the present application also proposes a storage medium, which is a computer-readable storage medium, and stores a computer program on the storage medium. When the computer program is executed by a processor, the steps of the wind farm frequency regulation method described above are implemented.

[0016] The present application provides a wind farm frequency regulation method, and the present application discloses determining the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole field according to the periodic sampling information of the wind farm grid connection point; determining the frequency modulation direction corresponding to one frequency modulation according to the frequency deviation value; limiting the total frequency modulation power of the whole field based on the frequency modulation direction to obtain the frequency modulation power instruction of the whole field after limiting; allocating the frequency modulation power instruction of the whole field after limiting to each wind turbine in the wind farm grid connection point based on the frequency modulation strategy, and the frequency modulation strategy is determined based on the frequency modulation direction; controlling the wind turbine to execute the frequency modulation power instruction of the whole field after limiting, and controlling the wind turbine to perform rotor kinetic energy control according to the frequency modulation strategy; compared with the prior art in the wind farm The extra power for providing primary frequency regulation and FFR functions comes from the fact that when the wind turbine rotor kinetic energy is released, it can only provide an FFR power source, but cannot provide a stable primary frequency regulation capability. The present invention limits the total frequency regulation power of the entire wind farm grid-connected point based on the direction of the primary frequency regulation, and distributes the limited total frequency regulation power command to the wind turbine to achieve primary frequency regulation. At the same time, the wind turbine is controlled to perform rotor kinetic energy control to provide FFR power, thereby solving the technical problem in the prior art that when the wind farm is frequency regulated, only an FFR power source can be provided by controlling the release of the wind turbine rotor kinetic energy, but cannot provide a stable primary frequency regulation capability, resulting in poor frequency regulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 A schematic diagram of a flow chart provided for Embodiment 1 of the wind farm frequency regulation method of the present application; Figure 2 This is a flow chart for calculating the total frequency regulation power of the entire wind farm in the frequency regulation method of the present application; Figure 3 A schematic diagram of a flow chart provided for Embodiment 2 of the wind farm frequency regulation method of the present application; Figure 4 The schematic diagram of limiting the frequency regulation power instruction of the whole field for the wind farm frequency regulation method of this application; Figure 5 A flow chart of the third embodiment of the wind farm frequency regulation method of the present application; Figure 6 This is the overall control flow chart of the wind farm frequency regulation method of this application; Figure 7 This is a schematic diagram of the module structure of a wind farm frequency regulation device according to an embodiment of the present application; Figure 8 Schematic diagram of the equipment structure of the hardware operating environment involved in the wind farm frequency regulation method in the embodiment of the present application.

[0020] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0022] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The main solution of the embodiment of the present application is: determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole field according to the periodic sampling information of the wind farm grid connection point; determine the frequency modulation direction corresponding to one frequency modulation according to the frequency deviation value; limit the total frequency modulation power of the whole field based on the frequency modulation direction to obtain the frequency modulation power instruction of the whole field after limiting; distribute the frequency modulation power instruction of the whole field after limiting to each wind turbine in the wind farm grid connection point based on the frequency modulation strategy, and the frequency modulation strategy is determined based on the frequency modulation direction; control the wind turbine to execute the frequency modulation power instruction of the whole field after limiting, and control the wind turbine to perform rotor kinetic energy control according to the frequency modulation strategy.

[0024] Since the additional power for providing primary frequency regulation and FFR functions in a wind farm in the prior art comes from the release of kinetic energy of the wind turbine rotor, it can only provide an FFR power source but cannot provide a stable primary frequency regulation capability, resulting in a poor frequency regulation effect.

[0025] The present application provides a solution, which limits the total frequency regulation power of the entire wind farm grid-connected point based on the direction of primary frequency regulation, and distributes the limited total frequency regulation power command to the wind turbine to achieve primary frequency regulation. At the same time, the wind turbine is controlled to perform rotor kinetic energy control to provide FFR power, thereby solving the technical problem in the prior art that when the wind farm is frequency regulated, only an FFR power source can be provided by controlling the rotor kinetic energy release of the wind turbine, but a stable primary frequency regulation capability cannot be provided, resulting in poor frequency regulation effect.

[0026] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a wind farm frequency adjustment device, etc. The following takes the wind farm frequency adjustment device as an example (hereinafter referred to as the device) to illustrate this embodiment and the following embodiments.

[0027] Based on this, the present application embodiment provides a wind farm frequency adjustment method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the wind farm frequency regulation method of the present application.

[0028] In this embodiment, the wind farm frequency adjustment method includes steps S10 to S50: Step S10: determining the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point.

[0029] It should be noted that the wind farm frequency regulation method proposed in this scheme can include primary frequency regulation function and FFR function. Its basic principle is to use the millisecond response time of the wind turbine converter to achieve rapid response of the active output of the wind farm to the frequency change of the grid connection point. Among them, the power source of FFR is the control of the rotor kinetic energy of the wind turbine itself, including the absorption and release of kinetic energy; primary frequency regulation is divided into two situations: upward and downward regulation: when adjusting downward, primary frequency regulation is achieved by reducing the output by changing the pitch and abandoning the wind; when adjusting upward, the primary frequency regulation capability is only available when the wind turbine is originally in the output limit state. When the wind turbine is originally in the full power state, the system can only provide a short-term FFR, and does not have the ability to adjust the frequency upward.

[0030] It can be understood that the above periodic sampling information may be information of the wind farm grid connection point obtained by periodic sampling. The periodic sampling information in this embodiment may include but is not limited to the frequency measurement value of the wind turbine.

[0031] It should be noted that the frequency deviation value may be the difference between the frequency measured in the current cycle and the set rated frequency. The total frequency modulation power of the entire field may be the total frequency modulation power of the wind farm grid connection point.

[0032] Furthermore, the step S10 includes: Step S101: determining a current frequency measurement value according to periodic sampling information of a wind farm grid connection point.

[0033] It can be understood that the above-mentioned current frequency measurement value may be a frequency value of the wind farm grid connection point measured in the current sampling period.

[0034] Step S102: determining a frequency deviation value of the wind farm grid connection point according to the current frequency measurement value and a preset rated frequency value.

[0035] It should be understood that the above-mentioned preset rated frequency value is the preset rated frequency value of the wind farm grid connection point, and the rated frequency value in this embodiment can be set according to actual needs. In this embodiment, the current frequency measurement value and the preset rated frequency value can be subtracted to obtain the frequency deviation value of the wind farm grid connection point.

[0036] Step S103: When the frequency deviation value exceeds the dead zone range, the frequency deviation value is input into the proportional gain channel and the differential gain channel respectively to obtain the proportional gain result and the differential gain result.

[0037] It should be noted that the dead zone range may be a frequency range for indicating that frequency adjustment is not performed. In this embodiment, if the frequency deviation value is within the dead zone range, the frequency condition is not performed at this time; if the frequency deviation value exceeds the dead zone range, the frequency adjustment is performed at this time.

[0038] It should be understood that the above-mentioned proportional gain channel and differential gain channel may be channels for performing proportional gain and differential gain on the frequency deviation value respectively.

[0039] Step S104: determining the total frequency modulation power of the wind farm grid connection point based on the proportional gain result and the differential gain result.

[0040] In the specific implementation, refer to Figure 2 , Figure 2 This is a flow chart for calculating the total frequency regulation power of the entire wind farm in the frequency regulation method of the present application. Figure 2 Medium sys Indicates the current frequency measurement value, f ref Indicates the set rated frequency value. In practical applications, the current frequency measurement value f can be measured first. sys and rated frequency f ref Subtract and obtain the frequency deviation value f, if the frequency deviation value If f exceeds the dead zone range, the frequency deviation value can be f is input to the proportional gain channel and the differential gain channel respectively. Each gain channel needs to pass through its own signal filter and gain coefficient (including the proportional gain coefficient k pf and the differential gain coefficient k df ), and then obtain the proportional gain result and the differential gain result. Finally, the total frequency modulation power of the wind farm grid connection point can be obtained by adding the proportional gain result and the differential gain result. .

[0041] Step S20: determining a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value.

[0042] Specifically, the frequency modulation direction includes: downward adjustment and upward adjustment; the step S20 includes: It should be noted that the frequency modulation direction corresponding to the above-mentioned primary frequency modulation may include: downward regulation and upward regulation, wherein downward regulation may be a regulation method for reducing power; upward regulation may be a regulation method for increasing power.

[0043] Step S201: determining whether the frequency deviation value exceeds the target value; Step S202a: If yes, the frequency modulation direction corresponding to the first frequency modulation is determined as downward modulation; Or, step S202b: if not, the frequency modulation direction corresponding to the first frequency modulation is determined as upward modulation.

[0044] In this embodiment, if the frequency deviation value is a positive value, the wind farm is adjusted downward; if the frequency deviation value is a negative value, the wind farm is adjusted upward. Therefore, in this embodiment, the above target value can be set to 0, and if the frequency deviation value is greater than 0, the frequency modulation direction corresponding to the primary frequency modulation can be determined as downward adjustment; if the frequency deviation value is less than 0, the frequency modulation direction corresponding to the primary frequency modulation can be determined as upward adjustment.

[0045] Step S30: performing a limiting process on the total frequency modulation power of the entire field based on the frequency modulation direction to obtain a full-field frequency modulation power instruction after limiting.

[0046] It should be understood that the limiting processing of the total frequency modulation power of the whole field can be a processing to control the total frequency modulation power of the whole field to be within a set threshold range. In this embodiment, the corresponding limiting thresholds for downward adjustment or upward adjustment of the wind farm are different. Therefore, in this embodiment, the total frequency modulation power of the whole field can be limited based on the limiting threshold corresponding to the frequency modulation direction corresponding to the primary frequency modulation, and the frequency modulation power instruction of the whole field after limiting can be obtained.

[0047] Step S40: allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction.

[0048] In this embodiment, the frequency modulation strategy can be a strategy adopted for frequency modulation of a wind farm. In practical applications, the device can set different frequency modulation strategies for the regulation of different directions of the wind farm, and then based on the frequency modulation strategy, the frequency modulation power command of the whole field after limiting can be reasonably distributed to each wind turbine for execution according to the different speeds, outputs, and rotor kinetic energy release adjustable powers of each wind turbine in the wind farm.

[0049] Step S50: controlling the fan to execute the full-field frequency modulation power instruction after the limit, and controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy.

[0050] In a specific implementation, after the wind turbines in the wind farm are allocated the frequency modulation power (here, the frequency modulation power command for the entire field after the above-mentioned limit), they can execute the frequency modulation power command and perform pitch control and rotor kinetic energy control at the same time. Among them, if the wind farm is adjusted downward at this time, the wind turbine performs rotor kinetic energy absorption control. When the rotor speed increases to the upper threshold, the rotor kinetic energy absorption control automatically exits and the frequency reading of the next sampling cycle is performed. In addition, if the wind farm is adjusted upward at this time, it can be determined whether each wind turbine is in an output limit state. If the wind turbine is in an output limit, the wind turbine performs rotor kinetic energy release control. When the rotor speed drops to the lower threshold, the rotor kinetic energy release control is exited, and the frequency reading of the next sampling cycle is performed; if the wind turbine is in a full-power state, only the rotor kinetic energy release control is performed. When the rotor speed drops to the lower threshold, the rotor kinetic energy release control is exited, and the frequency reading of the next sampling cycle is performed.

[0051] The present embodiment provides a wind farm frequency regulation method, which discloses determining the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole field according to the periodic sampling information of the wind farm grid connection point; determining the frequency modulation direction corresponding to one frequency modulation according to the frequency deviation value; limiting the total frequency modulation power of the whole field based on the frequency modulation direction to obtain the frequency modulation power instruction of the whole field after limiting; allocating the frequency modulation power instruction of the whole field after limiting to each wind turbine in the wind farm grid connection point based on the frequency modulation strategy, and the frequency modulation strategy is determined based on the frequency modulation direction; controlling the wind turbine to execute the frequency modulation power instruction of the whole field after limiting, and controlling the wind turbine to perform rotor kinetic energy control according to the frequency modulation strategy; compared with the prior art in the wind farm The additional power for providing primary frequency regulation and FFR functions comes from the fact that when the wind turbine rotor kinetic energy is released, it can only provide an FFR power source, but cannot provide a stable primary frequency regulation capability. Since this embodiment limits the total frequency regulation power of the entire wind farm grid-connected point based on the direction of the primary frequency regulation, and distributes the limited total frequency regulation power command to the wind turbine to achieve primary frequency regulation, at the same time, the wind turbine is controlled to perform rotor kinetic energy control to provide FFR power, thereby solving the technical problem in the prior art that when the wind farm frequency is modulated, only an FFR power source can be provided by controlling the rotor kinetic energy release of the wind turbine, but cannot provide a stable primary frequency regulation capability, resulting in poor frequency regulation effect.

[0052] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 3 , Figure 3 A schematic diagram of the flow chart of Embodiment 2 of the wind farm frequency regulation method of the present application.

[0053] In this embodiment, before step S30, the method further includes steps S301 to S303: Step S301: obtaining the measured speed, minimum speed, FFR control duration and unit rotational inertia of the target wind turbine in the wind farm grid connection point.

[0054] It should be noted that the above-mentioned target wind turbine can be any wind turbine in the wind farm, such as the i-th wind turbine in the wind farm; accordingly, the above-mentioned measured speed can be the speed of the target wind turbine collected in the current sampling period; the above-mentioned minimum speed is the minimum speed of the target wind turbine.

[0055] It can be understood that the FFR control duration is the duration of the fast frequency response. The unit moment of inertia can be a physical quantity used to describe the resistance of the fan to the change of angular acceleration during the rotational motion.

[0056] Step S302: determining an adjustable power increase margin of the target wind turbine when the target wind turbine drops from the measured speed to the minimum speed based on the measured speed, the minimum speed, the FFR control duration, and the unit rotational inertia.

[0057] It should be understood that the above adjustable power increase margin may be the power value that can be adjusted when the speed of a single unit drops from the measured speed to the minimum speed while maintaining a certain safety margin.

[0058] In this embodiment, the unit is considered to be only in the grid-connected state, and after adjustment, the unit will not shut down due to too low speed. The power margin can be adjusted by reducing the measured speed of the single unit to the minimum speed. The calculation formula can be:

[0059] In the formula, is the moment of inertia of the unit, i represents the i-th fan, is the measured speed, is the minimum speed, For the FFR control duration, It is a constant related to the status of the unit. Its value varies according to the status of the wind turbine unit, and is divided into the regulation standby status, free power generation status, and regulation start status; The value of is set according to the FFR duration required in the specific embodiment, and is generally not more than 5 seconds.

[0060] Step S303: determining the adjustable margin of rotor kinetic energy release of the entire wind farm corresponding to the wind farm grid connection point based on the adjustable power increase margin.

[0061] In this embodiment, the above-mentioned adjustable margin for the release of the rotor kinetic energy of the entire field can be the total power value that can be adjusted when all wind turbines in the wind farm grid-connected state drop from the measured speed to the minimum speed while maintaining a certain safety margin. up for: .

[0062] Accordingly, the step S30 includes: Step S30': based on the frequency modulation direction and the adjustable margin of the full-field rotor kinetic energy release, the full-field total frequency modulation power is limited to obtain a full-field frequency modulation power instruction after limiting.

[0063] Specifically, the step S30' includes: If the frequency modulation direction is upward adjustment, the total frequency modulation power of the entire field is limited based on the full-field power increase limit and the full-field rotor kinetic energy release adjustable margin to obtain the full-field frequency modulation power instruction after limiting.

[0064] It should be noted that the above-mentioned full-field power increase limit can be the maximum value of the frequency modulation power increase in the wind farm. In this embodiment, if the frequency modulation direction is upward adjustment, that is, when the wind farm is adjusted upward, the full-field total frequency modulation power can be limited based on the full-field power increase limit and the full-field rotor kinetic energy release adjustable margin to prevent the full-field total frequency modulation power from exceeding the full-field power increase limit. At this time, the full-field frequency modulation power instruction after limiting is obtained.

[0065] Or, if the frequency modulation direction is downward adjustment, the total frequency modulation power of the entire field is limited based on the full-field power reduction limit to obtain the full-field frequency modulation power instruction after limiting.

[0066] It should be noted that the above-mentioned full-field power reduction limit can be the minimum value of the frequency modulation power reduction in the wind farm. In this embodiment, if the frequency modulation direction is downward adjustment, that is, when the wind farm is adjusted downward, the full-field total frequency modulation power can be limited based on the full-field power limit to avoid the full-field total frequency modulation power being lower than the full-field power reduction limit, and at this time, the full-field frequency modulation power instruction after limiting is obtained.

[0067] In the specific implementation, refer to Figure 4 , Figure 4 The schematic diagram of the wind farm frequency regulation method in this application for limiting the frequency regulation power command of the whole field. Assume that the power limit of the whole field is , the power reduction limit for the whole field is ,like Figure 4 As shown in the figure, the total frequency regulation power of the wind farm grid connection point is After a limiting link, the full-field frequency modulation power instruction after limiting can be output In this embodiment, the frequency modulation direction of the wind farm is different, and the corresponding limit threshold is also different. When the wind farm performs power reduction regulation (downward regulation), that is, when <0, the power of the entire site can be reduced to a limit As the limiting threshold (the absolute value of the total frequency regulation power of the wind farm shall not exceed this threshold) Perform limiting processing and output the full-field FM power instruction after limiting ;when >0, the limit threshold can be determined based on the full-field power limit and the full-field rotor kinetic energy release adjustable margin. At this time, the limit threshold is , then based on the clipping threshold and The smaller value has a greater impact on the total FM power Perform limiting processing and output the full-field FM power instruction after limiting .

[0068] In this embodiment, the measured speed, minimum speed, FFR control duration and unit moment of inertia of the target wind turbine in the wind farm grid connection point are obtained; based on the measured speed, minimum speed, FFR control duration and unit moment of inertia, the adjustable power increase margin of the target wind turbine from the measured speed to the minimum speed is determined; based on the adjustable power increase margin, the adjustable margin of the whole-field rotor kinetic energy release corresponding to the wind farm grid connection point is determined; based on the frequency modulation direction and the adjustable margin of the whole-field rotor kinetic energy release, the whole-field total frequency modulation power is limited to obtain the whole-field frequency modulation power instruction after limiting, so as to avoid the frequency modulation power of the wind farm being too high or too low, which is beneficial to maintaining the balance of the power grid.

[0069] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction, and will not be described in detail later. Figure 5 , Figure 5 A schematic diagram of the flow chart of Embodiment 3 of the wind farm frequency regulation method of the present application.

[0070] In this embodiment, the frequency modulation strategy includes: a power reduction adjustment strategy; step S40 includes steps S401-S402: Step S401: when the frequency regulation strategy is the power reduction regulation strategy, a first frequency regulation power allocation weight is determined according to the real-time output power proportion of each wind turbine in the wind farm grid connection point.

[0071] It should be noted that the above-mentioned real-time output power ratio can be the ratio of the real-time output power of each wind turbine in the wind farm grid connection point to the total output power of all wind turbines in the wind farm grid connection point. Correspondingly, the above-mentioned first frequency modulation power allocation weight is the allocation weight of the frequency modulation power of the wind turbine.

[0072] Step S402: allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the first frequency regulation power allocation weight.

[0073] In this embodiment, when the wind farm is adjusted downward (power reduction adjustment), the power distribution can be unconstrained by the adjustable capacity of the rotor kinetic energy control, because the rapid power reduction provided by the abandoned wind pressure output relay rotor kinetic energy absorption can always be achieved through pitch control. The weight is determined by the proportion of. In this embodiment, the frequency modulation power allocation weight of the i-th wind turbine group (that is, the first frequency modulation power allocation weight) can be expressed as:

[0074] Then, the weights can be allocated based on the first frequency modulation power The frequency modulation power is allocated to the i-th wind turbine unit. At this time, the frequency modulation power allocated to the i-th unit is:

[0075] Correspondingly, the step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: Step S501: controlling the wind turbine to perform pitch control and rotor kinetic energy absorption control according to the power reduction regulation strategy.

[0076] It should be understood that when the wind farm is adjusted downward (power reduction regulation), the frequency modulation power command can be allocated to each wind turbine according to the proportion of the real-time output power of the wind turbine. The wind turbine can perform pitch control and rotor kinetic energy absorption control while executing the power command.

[0077] Furthermore, the frequency modulation strategy includes: a power increase adjustment strategy; step S40 also includes steps S411-S412: Step S411: when the frequency regulation strategy is the power increase regulation strategy, a second frequency regulation power allocation weight is determined according to the proportion of the releasable power of the rotor kinetic energy of each wind turbine in the wind farm grid connection point.

[0078] It should be noted that the above-mentioned rotor kinetic energy releasable power ratio may be the ratio of the rotor kinetic energy releasable power of each wind turbine in the wind farm grid connection point to the total rotor kinetic energy releasable power of all wind turbines in the wind farm grid connection point. Correspondingly, the above-mentioned second frequency modulation power allocation weight is the allocation weight of the frequency modulation power of the wind turbine.

[0079] Step S412: allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the second frequency regulation power allocation weight.

[0080] In this embodiment, when the wind farm is adjusted upward (increase power adjustment), the power released by the rotor kinetic energy of each wind turbine needs to be The weight can be determined by the proportion of. At this time, the frequency modulation power allocation weight of the i-th wind turbine group (that is, the second frequency modulation power allocation weight) can be:

[0081] Then, the second frequency modulation power allocation weight can be based on The frequency modulation power is allocated to the i-th wind turbine unit. At this time, the frequency modulation power allocated to the i-th unit is:

[0082] Correspondingly, the step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: Step S511: controlling the wind turbine to perform pitch control and rotor kinetic energy release control according to the power increase regulation strategy.

[0083] It should be understood that when the wind farm is adjusted upward (power increase regulation), the frequency modulation power command can be allocated to each wind turbine according to the proportion of adjustable power released by the rotor kinetic energy of each wind turbine. After the wind turbine executes the power command, it can be determined for each wind turbine whether it is in an output limiting state. If so, pitch control and rotor kinetic energy release control can be performed simultaneously. When the rotor speed drops to the lower threshold, the rotor kinetic energy release control is exited.

[0084] In the specific implementation, refer to Figure 6 , Figure 6 This is the overall control flow chart of the wind farm frequency regulation method of this application. Figure 6 As shown, when the wind farm grid connection point is quickly adjusted, the frequency measurement value of the wind farm grid connection point in the next adoption cycle can be read first, and the frequency deviation value can be calculated based on the frequency measurement value and the set rated frequency value. f, in f exceeds the dead zone (i.e. f>0), the frequency deviation value can be f is input into the proportional gain channel and the differential gain channel respectively, and the total frequency modulation power of the whole field is determined based on the proportional gain result and the differential gain result. .like f>0, the wind farm will adjust downward. At this time, the total frequency modulation power of the whole field can be limited to obtain the frequency modulation power instruction of the whole field after limiting. Then, the frequency modulation power allocation weight of each wind turbine can be calculated according to the proportion of the real-time output power of the wind turbine, and the frequency modulation power can be allocated to each wind turbine based on the frequency modulation power allocation weight. The wind turbine executes the power command while performing pitch control and rotor kinetic energy absorption control (the pitch control response time is slow, and the rotor kinetic energy absorption control performs millisecond-level rapid response in timing). When the rotor speed increases to the upper threshold, the rotor kinetic energy absorption control is exited, and pitch control is continued until f<0, the frequency reading of the next sampling cycle can be performed. In addition, if f<0, the wind farm adjusts upward. At this time, the adjustable power released by the rotor kinetic energy of each wind turbine at the current working point can be calculated, as well as the total adjustable power released by the rotor kinetic energy of the entire field, and the adjustable power released by the rotor kinetic energy of the entire field can be compared. The power limit value of the whole field , take the smaller value of the two as the upward adjustment power limit, and then limit the total frequency modulation power of the whole field based on the upward adjustment power limit to obtain the full-field frequency modulation power instruction after limiting , then the frequency modulation power command can be allocated to each wind turbine according to the proportion of the adjustable power released by the rotor kinetic energy of each wind turbine. At this time, the wind turbine can execute the power command and determine whether each wind turbine is in an output limit state. If so, the wind turbine can be simultaneously subjected to pitch control and rotor kinetic energy release control. When the rotor speed drops to the lower threshold, the rotor kinetic energy release control is exited, and the frequency reading of the next sampling cycle is performed; if not, only the rotor kinetic energy release control is performed. When the rotor speed drops to the lower threshold, the rotor kinetic energy release control is exited, and the frequency reading of the next sampling cycle is performed.

[0085] In this embodiment, it is disclosed that when the frequency regulation strategy is a power reduction regulation strategy or a power increase regulation strategy, the frequency regulation power allocation weight corresponding to each wind turbine in the wind farm is determined, and the frequency regulation power allocation weight distributes the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point, so that the wind turbine executes the frequency regulation power instruction, and controls the wind turbine to perform pitch control and rotor kinetic energy control, so that it can have both primary frequency regulation and FFR functions, and the regulation speed is fast and the accuracy is high.

[0086] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the wind farm frequency regulation method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0087] This application also provides a wind farm frequency adjustment device, please refer to Figure 7 , the wind farm frequency regulating device comprises: The power determination module 10 is used to determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point; A frequency modulation direction determination module 20, configured to determine a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value, wherein the frequency modulation direction includes downward modulation and upward modulation; A limiting processing module 30 is used to perform limiting processing on the total frequency modulation power of the whole field based on the frequency modulation direction to obtain a full-field frequency modulation power instruction after limiting; An instruction distribution module 40, configured to distribute the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction; The rotor kinetic energy control module 50 is used to control the fan to execute the full-field frequency modulation power instruction after the limit, and control the fan to perform rotor kinetic energy control according to the frequency modulation strategy.

[0088] The wind farm frequency regulation device provided by the present application adopts the wind farm frequency regulation method in the above embodiment, which can solve the technical problem in the prior art that when the wind farm frequency is regulated, only the FFR power source can be provided by controlling the rotor kinetic energy release of the wind turbine, but a stable primary frequency regulation capability cannot be provided, resulting in poor frequency regulation effect. Compared with the prior art, the beneficial effects of the wind farm frequency regulation device provided by the present application are the same as the beneficial effects of the wind farm frequency regulation method provided by the above embodiment, and the other technical features in the wind farm frequency regulation device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0089] The present application provides a wind farm frequency regulation device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the wind farm frequency regulation method in the above-mentioned embodiment 1.

[0090] Reference below Figure 8, which shows a schematic diagram of the structure of a wind farm frequency regulating device suitable for implementing the embodiment of the present application. The wind farm frequency regulating device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 8 The wind farm frequency regulating device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0091] like Figure 8 As shown, the wind farm frequency regulation device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the wind farm frequency regulation device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the wind farm frequency regulation device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a wind farm frequency regulation device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided instead.

[0092] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0093] The wind farm frequency regulation device provided by the present application adopts the wind farm frequency regulation method in the above embodiment, which can solve the technical problem of wind farm frequency regulation. Compared with the prior art, the beneficial effects of the wind farm frequency regulation device provided by the present application are the same as the beneficial effects of the wind farm frequency regulation method provided by the above embodiment, and other technical features in the wind farm frequency regulation device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0094] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0095] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0096] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the wind farm frequency regulation method in the above-mentioned embodiment.

[0097] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0098] The computer-readable storage medium may be included in the wind farm frequency regulating device; or may exist independently without being assembled into the wind farm frequency regulating device.

[0099] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the wind farm frequency regulation device, the wind farm frequency regulation device: determines the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole field according to the periodic sampling information of the wind farm grid connection point; determines the frequency modulation direction corresponding to one frequency modulation according to the frequency deviation value; limits the total frequency modulation power of the whole field based on the frequency modulation direction to obtain the frequency modulation power instruction of the whole field after limiting; distributes the frequency modulation power instruction of the whole field after limiting to each wind turbine in the wind farm grid connection point based on the frequency modulation strategy, and the frequency modulation strategy is determined based on the frequency modulation direction; controls the wind turbine to execute the frequency modulation power instruction of the whole field after limiting, and controls the wind turbine to perform rotor kinetic energy control according to the frequency modulation strategy.

[0100] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0101] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0102] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0103] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned wind farm frequency regulation method, and can solve the technical problem in the prior art that when the wind farm frequency is regulated, only the FFR power source can be provided by controlling the rotor kinetic energy release of the wind turbine, but a stable primary frequency regulation capability cannot be provided, resulting in poor frequency regulation effect. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the wind farm frequency regulation method provided in the above-mentioned embodiment, and will not be repeated here.

[0104] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A wind farm frequency regulation method, characterized in that: The method includes: Determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point; Determine a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value; Based on the frequency modulation direction, the total frequency modulation power of the whole field is limited to obtain the full-field frequency modulation power instruction after limiting; Allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction; The fan is controlled to execute the full-field frequency modulation power instruction after the limit, and the fan is controlled to perform rotor kinetic energy control according to the frequency modulation strategy.

2. The method according to claim 1, characterized in that The step of determining the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm grid connection point according to the periodic sampling information of the wind farm grid connection point comprises: Determine the current frequency measurement value based on the periodic sampling information of the wind farm grid connection point; Determining a frequency deviation value of the wind farm grid connection point according to the current frequency measurement value and a preset rated frequency value; When the frequency deviation value exceeds the dead zone range, the frequency deviation value is input into the proportional gain channel and the differential gain channel respectively to obtain the proportional gain result and the differential gain result; The total frequency modulation power of the wind farm grid connection point is determined based on the proportional gain result and the differential gain result.

3. The method according to claim 1, characterized in that The frequency modulation direction includes: downward modulation and upward modulation; the step of determining the frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value includes: Determining whether the frequency deviation value exceeds a target value; If yes, the frequency modulation direction corresponding to the first frequency modulation is determined as downward modulation; Or, if not, the frequency modulation direction corresponding to the first frequency modulation is determined as upward modulation.

4. The method according to claim 1, characterized in that Before the step of performing a limiting process on the total frequency modulation power of the entire field based on the frequency modulation direction to obtain the full-field frequency modulation power instruction after limiting, the step further includes: Obtain the measured speed, minimum speed, FFR control duration and unit moment of inertia of the target wind turbine at the wind farm grid connection point; Determine an adjustable power increase margin of the target wind turbine when the target wind turbine decreases from the measured speed to the minimum speed based on the measured speed, the minimum speed, the FFR control duration, and the unit rotational inertia; Determining an adjustable margin of rotor kinetic energy release for the entire wind farm corresponding to the wind farm grid connection point based on the adjustable power increase margin; The step of performing a limiting process on the total frequency modulation power of the entire field based on the frequency modulation direction to obtain a limited total frequency modulation power instruction of the entire field comprises: The total frequency modulation power of the entire field is limited based on the frequency modulation direction and the adjustable margin of the release of the kinetic energy of the entire field rotor, so as to obtain the limited total frequency modulation power instruction of the entire field.

5. The method according to claim 4, characterized in that The step of performing a limiting process on the total frequency modulation power of the whole field based on the frequency modulation direction and the adjustable margin of the release of the whole field rotor kinetic energy to obtain the full field frequency modulation power instruction after limiting includes: If the frequency modulation direction is upward adjustment, the total frequency modulation power of the whole field is limited based on the full-field power increase limit and the full-field rotor kinetic energy release adjustable margin to obtain the full-field frequency modulation power instruction after limiting; Or, if the frequency modulation direction is downward adjustment, the total frequency modulation power of the entire field is limited based on the full-field power reduction limit to obtain the full-field frequency modulation power instruction after limiting.

6. The method according to any one of claims 1 to 5, characterized in that The frequency regulation strategy includes: a power reduction regulation strategy; the step of allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the frequency regulation strategy includes: When the frequency regulation strategy is the power reduction regulation strategy, determining a first frequency regulation power allocation weight according to the real-time output power proportion of each wind turbine in the wind farm grid connection point; Allocating the limited full-field frequency modulation power instruction to each wind turbine in the wind farm grid connection point based on the first frequency modulation power allocation weight; The step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: The wind turbine is controlled to perform pitch control and rotor kinetic energy absorption control according to the power reduction regulation strategy.

7. The method according to any one of claims 1 to 5, characterized in that The frequency regulation strategy includes: a power increase regulation strategy; the step of allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the frequency regulation strategy includes: When the frequency regulation strategy is the power increase regulation strategy, determining the second frequency regulation power allocation weight according to the proportion of the releasable power of the rotor kinetic energy of each wind turbine in the wind farm grid connection point; Allocating the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on the second frequency regulation power allocation weight; The step of controlling the fan to perform rotor kinetic energy control according to the frequency modulation strategy includes: The wind turbine is controlled to perform pitch control and rotor kinetic energy release control according to the power increase regulation strategy.

8. A wind farm frequency adjustment device, characterized in that: The device comprises: A power determination module, used to determine the frequency deviation value of the wind farm grid connection point and the total frequency modulation power of the whole wind farm according to the periodic sampling information of the wind farm grid connection point; A frequency modulation direction determination module, used to determine a frequency modulation direction corresponding to a frequency modulation according to the frequency deviation value, wherein the frequency modulation direction includes downward adjustment and upward adjustment; A limiting processing module is used to perform limiting processing on the total frequency modulation power of the whole field based on the frequency modulation direction to obtain a full-field frequency modulation power instruction after limiting; An instruction distribution module, used for distributing the limited full-field frequency regulation power instruction to each wind turbine in the wind farm grid connection point based on a frequency regulation strategy, wherein the frequency regulation strategy is determined based on the frequency regulation direction; The rotor kinetic energy control module is used to control the fan to execute the full-field frequency modulation power instruction after the limit, and control the fan to perform rotor kinetic energy control according to the frequency modulation strategy.

9. A wind farm frequency regulation device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the wind farm frequency regulation method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the wind farm frequency regulation method according to any one of claims 1 to 7 are implemented.

Images