Wind farm power reduction control method, device, controller and storage medium

Abstract

The present disclosure provides a wind farm power reduction control method, device, controller, and storage medium. The wind farm power reduction control method includes: in response to the frequency of the grid connection point being greater than an overfrequency threshold parameter, determining the total power reduction amount that needs to be adjusted by the wind farm based on an adjustment amount parameter; calculating the inertia adjustment time required to complete the total power reduction amount using an inertia response; in response to the inertia adjustment time being less than or equal to an adjustment time parameter, controlling the wind turbines in the wind farm to reduce power using a non-braking resistor power reduction method; wherein the overfrequency threshold parameter for limiting the lower limit value of the severe overfrequency range, the adjustment amount parameter for limiting the adjustment amount requirement for rapid power reduction, and the adjustment time parameter for limiting the adjustment time requirement for rapid power reduction are pre-set.

Description

Technical Field

[0001] The present disclosure generally relates to the field of wind power technology, and more specifically, to a method, device, controller, and storage medium for controlling power reduction of a wind farm. Background Art

[0002] Figure 1 An example of wind farm regulating active power in response to grid frequency is shown. Figure 1 As shown, Fn represents the rated frequency of the grid, P0 represents the full-scale power value, and Pn represents the full-scale rated power value. When the frequency at the grid connection point is between [Fd- and Fd+] (i.e., the dead zone of primary frequency regulation), the wind turbines within the wind farm (hereinafter referred to as wind turbines) receive active power commands from the wind farm's energy management system (EMS). When the frequency at the grid connection point is between [F3 and Fd-] or [Fd+ and F1], the wind turbines can be controlled to adjust their active power using primary frequency regulation. For example, when the frequency at the grid connection point is between [Fd+ and F1], the full-scale active frequency regulation amplitude can be 10% of Pn, and the response time can be 3 seconds. When the frequency at the grid connection point is between [F1 and F2], the grid is in a severe overfrequency state, and the wind farm needs to adopt a rapid power reduction control strategy. For example, the full-scale active frequency regulation amplitude can be 50% of Pn, and the adjustment time can be 3 seconds. When the frequency of the grid connection point is greater than F2, the active power remains unchanged at the current state, and further changes in frequency require further reduction of power.

[0003] If the frequency at the grid connection point deviates from the rated frequency of the grid, the wind farm needs to adjust its active power output. The grids in different countries / regions have different requirements for this, especially for cases where the frequency at the grid connection point is severely overfrequency. For example, some countries / regions require that the power be reduced quickly when the frequency is severely overfrequency, requiring the wind farm to reduce Pn by 50% within 2 seconds; some countries / regions require that the wind farm reduce Pn by 50% within 5 seconds when the frequency is severely overfrequency.

[0004] The existing method of rapid power reduction in severe overfrequency, on the one hand, needs to be designed according to the grid requirements of specific countries / regions and has poor universality; on the other hand, it has a certain impact on the reliability, safety and stability of wind farms. Summary of the Invention

[0005] An exemplary embodiment of the present disclosure provides a method, device, controller, and storage medium for controlling power reduction in a wind farm, which can effectively solve the above-mentioned problems existing in the prior art.

[0006] According to a first aspect of an embodiment of the present disclosure, a method for controlling power reduction of a wind farm is provided, comprising: in response to a frequency of a grid-connected point being greater than an overfrequency threshold parameter, determining, based on an adjustment amount parameter, an amount of power reduction for the entire wind farm that requires adjustment; calculating an inertia adjustment time required to complete the power reduction for the entire farm using an inertia response; and in response to the inertia adjustment time being less than or equal to an adjustment time parameter, controlling wind turbines in the wind farm to reduce power using a non-braking resistor power reduction method; wherein an overfrequency threshold parameter for limiting a lower limit value of a severe overfrequency range, an adjustment amount parameter for limiting an adjustment amount requirement for rapid power reduction, and an adjustment time parameter for limiting an adjustment time requirement for rapid power reduction are pre-set.

[0007] Optionally, it also includes: in response to the inertia adjustment time being greater than the adjustment time parameter, calculating the braking resistor activation amount required to complete the full-field power reduction using the inertia response and the braking resistor; in response to the braking resistor activation amount being greater than a preset threshold, controlling the wind turbine to use the braking resistor to reduce power; in response to the braking resistor activation amount being less than or equal to the preset threshold, controlling the field-level centralized energy storage system or the wind turbine energy storage system to reduce power instead of the braking resistor.

[0008] Optionally, the step of controlling the fan to reduce power by using a braking resistor includes: in a first stage, controlling the fan to reduce power by using a non-braking resistor power reduction method, and then in a second stage, controlling the fan to reduce power by using both a non-braking resistor power reduction method and a braking resistor.

[0009] Optionally, compared with the first stage, the target regulation rate for limiting the grid-side power output of the wind turbine in the second stage is higher.

[0010] Optionally, compared with the first stage, the target regulation rate of the non-braking resistor power reduction mode of the wind turbine in the second stage is lower.

[0011] Optionally, the step of controlling the wind turbines to reduce power by simultaneously using a non-braking resistor power reduction method and a braking resistor in the second stage includes: determining the remaining power reduction amount that needs to be adjusted in the second stage based on the total power reduction amount and the real-time value of the total power at the end of the first stage; determining the single-machine power reduction amount that needs to be adjusted for each wind turbine in the second stage based on the remaining power reduction amount; and determining the target adjustment rate for limiting the grid-side power output of each wind turbine in the second stage based on the adjustment time parameter, the adjustment time of the first stage, the single-machine power reduction amount of each wind turbine, and the control coefficient.

[0012] Optionally, the step of controlling the wind turbines in the wind farm to reduce power by adopting a non-braking resistor power reduction method includes: controlling the wind turbines to reduce power by adopting at least one of inertia response, primary frequency modulation, and wind turbine energy storage system.

[0013] Optionally, the step of controlling the wind turbine to reduce power by adopting at least one of inertia response, primary frequency modulation, and a wind turbine energy storage system includes: controlling the wind turbine to reduce power only by adopting inertia response; or controlling the wind turbine to first reduce power by adopting inertia response, and then adopting primary frequency modulation to reduce power; or controlling the wind turbine to first reduce power by adopting primary frequency modulation, and then adopting inertia response to reduce power; or controlling the wind turbine to reduce power by adopting inertia response, and controlling a field-level centralized energy storage system to reduce power; or controlling the wind turbine to reduce power by adopting inertia response and a wind turbine energy storage system.

[0014] Optionally, the steps of controlling the wind turbines to reduce power by adopting inertia response and controlling the field-level centralized energy storage system to reduce power include: determining the reducible power amount of the field-level centralized energy storage system and the inertia reducible power amount of each wind turbine; in accordance with the principle of maximizing the reducible power amount of the field-level centralized energy storage system, based on the total field power reduction amount, the reducible power amount of the field-level centralized energy storage system and the inertia reducible power amount of each wind turbine, simultaneously controlling the field-level centralized energy storage system to reduce power and each wind turbine to reduce power by adopting inertia response.

[0015] Optionally, the step of controlling the wind turbines to use inertia response and the wind turbine energy storage system to reduce power includes: determining the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, and according to the principle of making full use of the power reduction amount of the wind turbine energy storage system, based on the power reduction amount of the entire field, the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, controlling each wind turbine to use inertia response and the wind turbine energy storage system to reduce power at the same time; or, based on the single-machine power reduction amount that needs to be adjusted by each wind turbine, issuing power adjustment instructions to each wind turbine separately, so that each wind turbine uses inertia response and the wind turbine energy storage system to reduce power at the same time according to the received power adjustment instructions.

[0016] According to a second aspect of an embodiment of the present disclosure, a power reduction control device for a wind farm is provided, comprising: an adjustment amount determination unit configured to, in response to a frequency of a grid connection point being greater than an overfrequency threshold parameter, determine, based on the adjustment amount parameter, an amount of power reduction for the entire wind farm that requires adjustment; an inertia adjustment time determination unit configured to calculate an inertia adjustment time required to complete the power reduction for the entire farm using an inertia response; and a wind turbine control unit configured to, in response to the inertia adjustment time being less than or equal to the adjustment time parameter, cause the wind turbines in the wind farm to reduce power using a non-braking resistor; wherein the overfrequency threshold parameter for limiting a lower limit value of a severe overfrequency range, the adjustment amount parameter for limiting an adjustment amount requirement for rapid power reduction, and the adjustment time parameter for limiting an adjustment time requirement for rapid power reduction are preset.

[0017] According to a third aspect of an embodiment of the present disclosure, a computer-readable storage medium storing a computer program is provided. When the computer program is executed by a processor, the processor is prompted to execute the wind farm power reduction control method as described above.

[0018] According to a fourth aspect of an embodiment of the present disclosure, a wind farm controller is provided, comprising: a processor; and a memory storing a computer program, which, when executed by the processor, prompts the processor to execute the wind farm power reduction control method described above.

[0019] According to a fifth aspect of the embodiments of the present disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the power reduction control method for a wind farm as described above is implemented.

[0020] According to the power reduction control method, device, controller, storage medium and program product of the wind farm of the exemplary embodiment of the present disclosure, on the one hand, the severe overfrequency rapid power reduction scheme is parameterized by setting multiple pre-set parameters, so that the same scheme can be applied to countries / regions with different requirements for severe overfrequency rapid power reduction, thereby improving the applicability of the scheme; on the other hand, it is proposed not to enable the braking resistor unless necessary in the severe overfrequency rapid power reduction control, so as to minimize the response impact of severe overfrequency rapid power reduction and low voltage ride-through LVRT, and improve the safety and stability of wind turbine operation.

[0021] In the following description, some aspects and / or advantages of the general inventive concept of the present disclosure will be set forth, and some aspects and / or advantages will be known through the following description or implementation of the general inventive concept of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] These and / or other aspects and advantages of the present application will become more clear and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0023] Figure 1 An example of an existing wind farm regulating power in response to grid frequency is shown;

[0024] Figure 2 A flow chart showing a method for controlling power reduction of a wind farm according to an exemplary embodiment of the present disclosure;

[0025] Figure 3 A flow chart showing a method for controlling power reduction of a wind farm according to another exemplary embodiment of the present disclosure is shown;

[0026] Figure 4 A flow chart showing a method for controlling a wind turbine to reduce power by simultaneously using a non-braking resistor power reduction method and a braking resistor in a second stage according to an exemplary embodiment of the present disclosure;

[0027] Figure 5 An example of a rapid power reduction curve for a wind turbine in the event of severe overfrequency is shown;

[0028] Figure 6 An example of a wind turbine rapid power reduction curve when severely over-frequency is encountered according to an exemplary embodiment of the present disclosure is shown;

[0029] Figure 7 Another example of a wind turbine rapid power reduction curve under severe overfrequency according to an exemplary embodiment of the present disclosure is shown;

[0030] Figure 8 A flow chart showing a method for reducing power using inertia response and a field-level centralized energy storage system according to an exemplary embodiment of the present disclosure;

[0031] Figure 9 A flow chart showing a method for reducing power using inertia response and a distributed energy storage system according to an exemplary embodiment of the present disclosure;

[0032] Figure 10 A flow chart illustrating a method for reducing power using inertia response and a distributed energy storage system according to another exemplary embodiment of the present disclosure;

[0033] Figure 11 A flow chart illustrating a method for reducing power using inertia response and a distributed energy storage system according to another exemplary embodiment of the present disclosure;

[0034] Figure 12 A structural block diagram of a wind farm power reduction control device according to an exemplary embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0035] Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below with reference to the drawings in order to explain the present disclosure.

[0036] It should be noted that the terms "first," "second," and the like in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure as detailed in the appended claims.

[0037] It should be noted that the phrase "at least one of the items" in this disclosure includes three types of parallel situations: "any one of the items", "a combination of any multiple items of the items", and "all of the items". For example, "including at least one of A and B" includes the following three parallel situations: (1) including A; (2) including B; (3) including A and B. For another example, "performing at least one of step 1 and step 2" includes the following three parallel situations: (1) performing step 1; (2) performing step 2; and (3) performing steps 1 and 2.

[0038] Rapid wind turbine power reduction (e.g., 50% Pn reduction within 2 seconds) is a demanding operation that requires rapid and accurate adjustment of the wind turbine's operating state. The following are possible resources and methods for achieving rapid power reduction:

[0039] Pitch control: It is one of the most commonly used power regulation methods in wind turbines. By quickly adjusting the pitch angle of the blades, the efficiency of the blades in capturing wind energy can be changed, thereby achieving rapid power reduction. In the case of rapid power reduction, the pitch control system needs to respond quickly and accurately adjust the pitch angle to the predetermined position.

[0040] Braking resistor: When a wind turbine needs to reduce power quickly, a braking resistor can be used to dissipate excess energy, thereby reducing power. This method is suitable for situations where a large amount of energy needs to be consumed in a short period of time. For example, a direct-drive wind turbine can be braked using a chopper device, and a doubly-fed wind turbine can be braked using a crowbar circuit.

[0041] Generator control: By adjusting the generator's excitation current or speed, the generator's output power can be changed. In a rapid power reduction scenario, the generator control system needs to quickly adjust parameters to ensure accurate power reduction.

[0042] Yaw control: While yaw control is primarily used to maintain a perpendicular relationship between the wind turbine and the wind direction to maximize wind energy capture efficiency, in some cases, yaw control can also be used to assist in achieving rapid power reduction. That is, by adjusting the yaw angle of the wind turbine, the energy captured by the wind can be reduced, thereby reducing the wind turbine's output power. In rapid power reduction scenarios, this method may be relatively limited in effectiveness and needs to be used in combination with other control methods.

[0043] The following is an introduction to inertia control. Inertia is a key parameter of the power system, reflecting the system's ability to resist rapid frequency changes. Wind turbine inertia control aims to adjust the wind turbine's operating state so that it can provide inertial support for system frequency changes, just like a traditional synchronous generator. Wind turbine inertia control strategies can be divided into current source control and voltage source control. Current source control: With output current as the control target, the wind turbine's active power output is changed by introducing virtual inertia and droop control. Voltage source control: Unlike current source control, it focuses on achieving inertia control by adjusting the wind turbine's voltage output.

[0044] In the inertia control of wind turbines, adjusting the excitation current and speed of the generator is a possible control method, but it is not the only method. For doubly fed wind turbines, their control is more complex because they have the operating characteristics of both asynchronous motors and synchronous motors. Inertia control of doubly fed wind turbines may involve coordinated control of the rotor-side converter and the grid-side converter to adjust the excitation current and speed. For direct-drive permanent magnet synchronous wind turbines, inertia control may rely more on the control strategy of the converter, and possible assistance from the energy storage system. Therefore, in addition to adjusting the excitation current and speed, the inertia control of wind turbines may also involve the use of energy storage systems, pitch angle control, and overspeed-load reduction operation strategies. The energy storage system can provide or absorb energy in a short period of time, thereby helping the wind turbine to respond quickly to changes in system frequency.

[0045] In summary, wind turbine inertia control is not limited to controlling the excitation current or speed of the generator. It is a comprehensive control strategy that may involve the combined use of multiple control methods and technologies to achieve a fast and effective response of the wind turbine to system frequency changes.

[0046] Chopper devices are typically designed for use in wind turbine converters to mitigate grid low voltage ride-through (LVRT) faults. When the grid voltage drops, the grid voltage at the connection point decreases, hindering wind turbine energy delivery. In this situation, the chopper device uses IGBT power modules connected in series with a dump resistor to dissipate energy, protecting the wind turbine converter and enabling LVRT. The chopper device operates instantaneously, dissipating energy as soon as the DC bus voltage exceeds the set value. Therefore, it dissipates energy very quickly.

[0047] Electrochemical energy storage systems, such as lithium-ion batteries or supercapacitors, store and release energy through chemical reactions. These systems typically have high energy and power density and are able to quickly respond to grid demand to provide or absorb energy. However, compared to the instantaneous energy discharge of a Chopper device, the energy discharge rate of an electrochemical energy storage system may be affected by factors such as the chemical reaction rate inside the battery, the control strategy of the battery management system (BMS), and external circuit limitations. From the perspective of instantaneous energy discharge, a Chopper device generally has a faster energy discharge rate due to its mechanism of directly discharging energy through resistance. Although electrochemical energy storage systems can also respond quickly and provide or absorb energy, their discharge rate may be affected by more factors and may not be as fast as a Chopper device in some cases.

[0048] Crowbar circuits are primarily used in wind turbines to protect them from abnormal conditions such as grid voltage sags. They operate by short-circuiting the generator rotor, bypassing the rotor current through the crowbar resistor, thereby preventing overcurrent damage to the wind turbine. The crowbar circuit was not designed for precise power reduction, but rather as a protective device. During grid voltage anomalies, the crowbar circuit can quickly operate to bypass the rotor current, protecting the wind turbine from damage. Using a crowbar circuit for power control may not achieve the required 50% power reduction, as its primary purpose is protection rather than precise control. Crowbar circuits are typically triggered based on grid voltage rather than directly controlling wind turbine power output. Crowbar circuits typically have a fast response time, operating within milliseconds, which is advantageous for achieving short-term power reduction (e.g., within 2 seconds). However, the accuracy and stability of power reduction may be limited.

[0049] The existing rapid power reduction scheme for wind farms with severe overfrequency at the grid connection point has the following shortcomings: 1) The specific rapid power reduction scheme can only be set up according to the specific requirements of the country / region for severe overfrequency rapid power reduction (for example, reducing 50% Pn within 3s), and the scheme cannot be applied to countries / regions with different severe overfrequency rapid power reduction requirements (for example, reducing 50% Pn within 2s). 2) Severe overfrequency rapid power reduction and low voltage ride-through LVRT affect each other. If the two operating conditions occur continuously in time, the post-triggering function will not respond normally and the reliability requirements of the grid demand function will not be met. 3) If an overly large braking resistor is installed (for example, a Chopper device or a Crowbar circuit), it will increase the cost and the installation size will be too large, and it may be necessary to change the internal installation structure of the wind turbine.

[0050] Taking into account the above-mentioned deficiencies, the present disclosure proposes, on one hand, that: by setting a plurality of pre-set parameters, the severe overfrequency rapid power reduction scheme is parameterized, so that the same scheme can be applied to a variety of regulation performance requirements (regulation amount requirements, regulation time requirements, severe overfrequency range requirements), so that it can be applied to countries / regions with different requirements for severe overfrequency rapid power reduction, thereby increasing the scope of application. The present disclosure proposes, on the other hand, that: in severe overfrequency rapid power reduction, the braking resistor should not be enabled unless necessary, so as to improve the reliability of the grid demand function, and minimize the response effects of severe overfrequency rapid power reduction and low voltage ride-through LVRT; improve the safety and stability of wind turbine operation, avoid the risk of excessive bus voltage and excessive current due to insufficient braking resistors, and try to make the wind turbine respond according to the active power control strategy of relatively slow speed as much as possible, thereby improving the safety factor and stability, and increasing the life of the wind turbine; avoid the unstable operation of the wind turbine caused by frequent use of braking resistors, thereby reducing maintenance costs and downtime. The following will be combined with Figures 2 to 12 Provide detailed explanation.

[0051] Figure 2 A flow chart illustrating a power reduction control method for a wind farm according to an exemplary embodiment of the present disclosure is shown.

[0052] As an example, the power reduction control method of a wind farm according to an exemplary embodiment of the present disclosure may be executed by a farm-level controller of the wind farm.The wind farm may include multiple wind turbines, which are connected to the power grid in an appropriate manner.

[0053] Reference Figure 2 In step S100, in response to the frequency of the grid connection point being greater than the overfrequency threshold parameter, the total power reduction amount that needs to be adjusted by the wind farm is determined based on the adjustment amount parameter.

[0054] Overfrequency threshold parameter f fast The lower limit for severe overfrequency is used to define the range. It can be pre-set based on actual conditions and specific needs. If the frequency of the grid connection point is greater than the overfrequency threshold parameter, it can be determined that the grid is severely overfrequency.

[0055] The adjustment amount parameter δ% is used to limit the adjustment amount requirement for rapid power reduction, and can be preset according to actual conditions and specific needs.

[0056] As an exemplary embodiment, the step of determining the total power reduction amount that needs to be adjusted by the wind farm based on the adjustment amount parameter may include: taking the product of the adjustment amount parameter and the rated power Pn of the wind farm, or the product of the adjustment amount parameter and the current real-time power P0 of the wind farm as the total power reduction amount that needs to be reduced by the wind farm. Specifically, the total power reduction amount DeltP = δ% × P n Or DeltP = δ% × P0.

[0057] As an exemplary embodiment, a reference parameter Base may also be included. The reference parameter is used to determine whether the total power reduction is calculated based on the rated power Pn or the current real-time power P0 in the above calculation, and may be pre-set according to actual conditions and specific needs.

[0058] In step S200 , the inertia adjustment time required to complete the full-field power reduction using the inertia response is calculated.

[0059] As an exemplary embodiment, the inertia adjustment time Among them, Rate Iner Indicates the adjustment rate of inertia response, for example, it can be 15% Pn 单机 / s~20%Pn 单机 / s.

[0060] In step S300, in response to the inertia adjustment time being less than or equal to the adjustment time parameter, wind turbines within the wind farm are controlled to reduce power using a non-braking resistor power reduction method. In other words, in response to the inertia adjustment time being less than or equal to the adjustment time parameter, the wind turbines are not controlled to reduce power using a braking resistor.

[0061] The adjustment time parameter N is used to limit the adjustment time requirement for rapid power reduction, and can be preset according to actual conditions and specific needs.

[0062] It should be understood that the overfrequency threshold parameter f can be pre-set according to the specific requirements of the country / region where the wind farm is located for rapid power reduction due to severe overfrequency. fast , the adjustment parameter δ%, the adjustment time parameter N, and the reference parameter Base are specifically set, so that the wind farm power reduction control method according to the exemplary embodiments of the present disclosure can meet different rapid power reduction requirements. For example, to reduce Pn by 50% within 2 seconds, the adjustment parameter δ% needs to be set to 50%, the adjustment time parameter N needs to be set to 2 seconds, and the reference parameter Base needs to be set to Pn. To reduce P0 by 60% within 6 seconds, the adjustment parameter δ% needs to be set to 60%, the adjustment time parameter N needs to be set to 6 seconds, and the reference parameter Base needs to be set to P0.

[0063] As an exemplary embodiment, step S300 may include: in response to the inertia adjustment time being less than or equal to the adjustment time parameter, controlling the wind turbine to reduce power by adopting at least one of inertia response, primary frequency regulation, and wind turbine energy storage system.

[0064] Preferably, the following provides first to fifth embodiments for controlling the wind turbine to reduce power by adopting at least one of inertia response, primary frequency modulation, and a wind turbine energy storage system.

[0065] As a first embodiment, the wind turbines may be controlled to reduce power only by adopting inertia response, that is, the power reduction of the entire field is completed entirely according to the inertia response.

[0066] As an example, if the theoretical inertia adjustment time is significantly greater than the adjustment time parameter, for simplicity, full inertia can be enabled. For example, if a 60% Pn reduction within 6 seconds is required, a 60% Pn reduction based on the inertia response can be achieved in just 3 seconds, effectively eliminating the need for a brake resistor. Similarly, if a 50% Pn reduction within 3 seconds is required, a 50% Pn reduction based on the inertia response can be achieved in just 2.5 seconds, effectively eliminating the need for a brake resistor.

[0067] As a second embodiment, the fan may be controlled to first reduce power by inertia response and then reduce power by primary frequency modulation. That is, the fan may be controlled to first adjust the inertia response and then perform primary frequency modulation.

[0068] For example, to meet the regulation requirement of reducing Pn by 60% within 6 seconds, the inertia response can be used to reduce Pn by 40% in the first 2 seconds, and the remaining 20% Pn can be reduced by a single frequency modulation, which can also meet the requirement and completely avoid the consumption of braking resistors.

[0069] As a third embodiment, the fan may be controlled to firstly reduce power by frequency modulation and then reduce power by inertia response. That is, the fan may be controlled to firstly reduce power by frequency modulation and then reduce power by inertia response.

[0070] For example, to meet the regulation requirement of reducing Pn by 60% within 6 seconds, an instruction can be sent to the fan to reduce Pn by 20% according to a single frequency regulation. After the theoretical execution time of a single frequency regulation is reached, the remaining 40% Pn is adjusted using inertia response, which can meet the demand and completely avoid consuming the braking resistor.

[0071] Through resource analysis, if there are energy storage resources available, wind power + energy storage can also be used to achieve rapid power reduction. The conventional energy storage configuration of a wind farm is generally 10% to 15% Pn. When the SOC meets the regulation requirements, a maximum of 10% to 15% Pn can be adjusted in no more than 1s.

[0072] As a fourth embodiment, the wind turbine may be controlled to reduce power by adopting an inertia response, and the field-level centralized energy storage system may be controlled to reduce power.

[0073] As an example, the steps of controlling the wind turbines to reduce power using inertia response and controlling the field-level centralized energy storage system to reduce power include: determining the amount of power that can be reduced by the field-level centralized energy storage system and the amount of power that can be reduced due to the inertia of each wind turbine; in accordance with the principle of maximizing the amount of power that can be reduced by the field-level centralized energy storage system, based on the power reduction amount of the entire field, the amount of power that can be reduced by the field-level centralized energy storage system, and the amount of power that can be reduced due to the inertia of each wind turbine, simultaneously controlling the field-level centralized energy storage system to reduce power and each wind turbine to reduce power using inertia response.

[0074] As an example, Figure 8 As shown, centralized energy storage (i.e., field-level centralized energy storage systems) can be uniformly dispatched and managed through a field-level controller. The field controller can calculate the actual adjustable capacity of the wind turbine inertia and the adjustable capacity of the centralized energy storage under the current SOC state. The total regulation demand (i.e., DeltP) is then divided into two parts based on the calculation results. Usually, when the inertia response adjustment amount is 20% to 30% of Pn, the adjustment accuracy is high. However, if the inertia response adjustment amount is increased, the accuracy and time accuracy will decrease. Therefore, the allocation principle can be set as follows: try to use all the adjustable energy of the centralized energy storage, and then allocate the remaining energy to the inertia response. The two actions of inertia response power reduction and centralized energy storage power reduction can be performed simultaneously.

[0075] Mode flag G_DeltPFlag=1 indicates that the single frequency modulation power increase mode is enabled (the mode and execution rate match, and there is a matching rate setting channel), G_DeltPFlag=-1 indicates that the single frequency modulation power reduction mode is enabled (the mode and execution rate match, and there is a matching rate setting channel), G_DeltPFlag=2 indicates that the fast power increase mode is enabled (the mode and execution rate match, and there is a matching rate setting channel), G_DeltPFlag=-2 indicates that the fast power reduction mode is enabled (the mode and execution rate match, and there is a matching rate setting channel), G_DeltPFlag=3 indicates that the inertia response power increase mode is enabled (the mode and execution rate match, and there is a matching rate setting channel), G_DeltPFlag=-3 indicates that the inertia response power reduction mode is enabled (the mode and execution rate match, and there is a matching rate setting channel). As an example, in an exemplary embodiment of the present disclosure, the mode flag G_DeltPFlag=-2 can be set.

[0076] As a fifth embodiment, the wind turbine may be controlled to reduce power by using inertia response and a wind turbine energy storage system.

[0077] As an example, the energy storage system of a wind turbine (e.g., a grid-type wind turbine) can be directly controlled by the field control, and the step of controlling the wind turbine to reduce power by using inertia response and the wind turbine energy storage system may include: determining the inertia-reducible power amount of each wind turbine and the wind turbine energy storage system's reducible power amount, and in accordance with the principle of fully utilizing the wind turbine energy storage system's reducible power amount, based on the total field power reduction amount, the inertia-reducible power amount of each wind turbine, and the wind turbine energy storage system's reducible power amount, controlling each wind turbine to simultaneously use inertia response and the wind turbine energy storage system to reduce power. Specifically, in accordance with the principle of fully utilizing the wind turbine energy storage system's reducible power amount, based on the total field power reduction amount, the inertia-reducible power amount of each wind turbine, and the wind turbine energy storage system's reducible power amount, determining the power reduction amount that each wind turbine needs to use inertia response adjustment and the power reduction amount that each wind turbine's energy storage system needs to adjust, and based on this, simultaneously controlling the wind turbine's inertia response and the wind turbine's energy storage system.

[0078] As an example, Figure 9 As shown, the distributed DC energy storage (i.e., the energy storage system of each wind turbine) can be uniformly dispatched and managed through field control equipment. The field control calculates the actual adjustable capacity of the wind turbine inertia and the adjustable capacity of the distributed energy storage at its current SOC state. Based on the calculated results, the total regulation demand is divided into two parts. Typically, when the inertia response adjustment is between 20% and 30% of Pn, regulation accuracy is high. However, increasing the inertia response adjustment decreases accuracy and time accuracy. Therefore, the allocation principle can be set as follows: maximize the use of the distributed energy storage's adjustable energy, and allocate the remaining energy to the inertia response. Both inertia response power reduction and distributed energy storage power reduction can be performed simultaneously. The field control issues two sets of regulation commands to the wind turbine, one to the inertia interface and the other to the energy storage interface.

[0079] As another example, the wind turbine can autonomously control its own energy storage system. The steps of controlling the wind turbine to use inertia response and the wind turbine energy storage system to reduce power may include: based on the total power reduction amount, the inertia power reduction amount of each wind turbine, and the power reduction amount of the wind turbine energy storage system, determining the single-machine power reduction amount that needs to be adjusted by each wind turbine, and then issuing power adjustment instructions to each wind turbine based on the single-machine power reduction amount that needs to be adjusted by each wind turbine, so that each wind turbine uses inertia response and the wind turbine energy storage system to reduce power at the same time according to the received power adjustment instruction.

[0080] For example, Figure 10 As shown, the wind turbine master controller simultaneously controls two sets of resources: pitch control and torque, as well as energy storage. The overall control demand (i.e., individual unit power reduction) is transmitted by the field control equipment to the wind turbine master controller, which then allocates the individual unit power reduction to the wind turbine torque and DC distributed energy storage. Torque response and energy storage power reduction occur simultaneously.

[0081] As another example, a wind turbine may autonomously control its own energy storage system. The step of controlling the wind turbine to use inertia response and the wind turbine energy storage system to reduce power may include: determining the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, and in accordance with the principle of maximizing the power reduction amount of the wind turbine energy storage system, based on the total power reduction amount, the inertia power reduction amount of each wind turbine, and the power reduction amount of the wind turbine energy storage system, controlling each wind turbine to simultaneously use inertia response and the wind turbine energy storage system to reduce power.

[0082] For example, Figure 11 As shown, the wind turbine master controller controls pitch and torque, while the inverter controller controls energy storage. The wind turbine control system calculates the actual wind turbine inertia adjustability and the adjustable capacity of the distributed energy storage at the current SOC state. Based on this calculation, the total control demand is divided into two parts. Typically, when the inertia response adjustment is between 20% and 30% of Pn, control accuracy is high. However, increasing the inertia response adjustment decreases accuracy and timing accuracy. Therefore, the allocation principle can be set to maximize the use of the distributed energy storage's adjustable energy, with the remainder allocated to the inertia response. Both inertia response power reduction and distributed energy storage power reduction can occur simultaneously. The wind turbine control system issues two sets of control commands to the wind turbine. The first set of commands is the total control demand, which is sent from the wind turbine master controller to the inverter controller. The second set of commands is the torque command, which is sent to the wind turbine inertia interface. The wind turbine master controller operates in normal control mode, and the inverter controller activates energy storage control based on the difference between the total command and the received torque command.

[0083] Figure 3 A flow chart illustrating a power reduction control method for a wind farm according to another exemplary embodiment of the present disclosure is shown.

[0084] Reference Figure 3 According to another exemplary embodiment of the present disclosure, a wind farm power reduction control method may include steps S400 to S600 in addition to steps S100 to S300 .

[0085] In step S400 , in response to the inertia adjustment time being greater than the adjustment time parameter, a braking resistor activation amount required to complete the full field power reduction amount by using the inertia response and the braking resistor is calculated.

[0086] As an exemplary embodiment, the braking resistor activation amount DeltP required to complete the full-field power reduction amount DeltP using the inertia response and the braking resistor can be calculated by the following formula: break :

[0087] DeltP break =DeltP-t1*Rate Iner ,

[0088] Among them, the inertia adjustment time After rounding, we get t1, Rate Iner Indicates the adjustment rate of inertia response.

[0089] In step S500 , in response to the braking resistor activation amount being greater than a preset threshold, the wind turbine is controlled to reduce power using the braking resistor.

[0090] As an example, the value of the preset threshold can be set according to the actual situation and specific needs, for example, it can be set to 10% Pn. break >10% Pn, the fan is controlled to use a braking resistor to reduce power.

[0091] When a wind turbine uses a braking resistor to reduce power, it must also utilize a non-braking resistor power reduction method (e.g., inertia response or primary frequency modulation) to reduce power. As an exemplary embodiment, step S500 may include: in response to the braking resistor activation amount being greater than a preset threshold, controlling the wind turbine to reduce power using both the braking resistor and non-braking resistor power reduction methods.

[0092] As an exemplary embodiment, step S500 may include: in response to the braking resistor activation amount being greater than a preset threshold, controlling the fan to reduce power using a non-braking resistor power reduction method in a first phase, and then controlling the fan to reduce power using both a non-braking resistor power reduction method and a braking resistor in a second phase. This allows for minimizing braking resistor consumption even when braking resistor power reduction is necessary. For example, the fan may be controlled to reduce power using primary frequency modulation in the first phase, and then controlled to reduce power using both primary frequency modulation and a braking resistor in the second phase. Alternatively, the fan may be controlled to reduce power using inertia response in the first phase, and then controlled to reduce power using both primary frequency modulation and a braking resistor in the second phase. For example, to achieve a 50% Pn reduction within 2 seconds, the fan inertia response may be used to reduce Pn by 20% in the first second (i.e., the first phase), and then the fan inertia response and a braking resistor may be used to reduce Pn by 30% in the second second (i.e., the second phase).

[0093] In step S600 , in response to the braking resistor activation amount being less than or equal to a preset threshold, the field-level centralized energy storage system or the wind turbine energy storage system is controlled to reduce power instead of the braking resistor.

[0094] As an example, the field-level centralized energy storage system or the wind turbine energy storage system can be controlled to replace the braking resistor to reduce power according to the method of controlling the braking resistor in the exemplary embodiment of step S500. As another example, the field-level centralized energy storage system can be controlled to replace the braking resistor to reduce power according to the fourth embodiment. For example, for the regulation requirement of reducing 50% Pn within 2 seconds, the wind turbine inertia response can be used to reduce 40% Pn in 2 seconds, and the remaining 10% Pn can be adjusted by the field-level centralized energy storage system, which can meet the demand and completely abandon the consumption of the braking resistor. The wind turbine energy storage system can also be controlled to replace the braking resistor to reduce power according to the fifth embodiment. For example, for the regulation requirement of reducing 50% Pn within 2 seconds, the wind turbine inertia response can be used to reduce 40% Pn in 2 seconds, and the remaining 10% Pn can be adjusted by the wind turbine energy storage system, which can meet the demand and completely abandon the consumption of the braking resistor.

[0095] In the above embodiment, the power reduction control of pitch control, generator, yaw, etc. is uniformly incorporated into the primary frequency regulation and inertia response. The present disclosure does not specifically reflect the detailed control strategy of the primary frequency regulation or inertia response inside the wind turbine. It only takes the comprehensive balanced regulation of the four resources of primary frequency regulation, inertia response, braking resistor, and energy storage control as the core idea. It is necessary to meet the speed and accuracy requirements of the power grid and consider the safety and reliability of the wind turbine. Therefore, the available resources will be balanced, the strong dependence on a certain resource will be minimized, and the consumption of the braking resistor will be minimized.

[0096] Figure 4 A flow chart illustrating a method for controlling a wind turbine to reduce power by simultaneously adopting a non-braking resistor power reduction method and a braking resistor in a second stage according to an exemplary embodiment of the present disclosure.

[0097] Reference Figure 4 In step S501, based on the total power reduction amount and the total power real-time value at the end of the first stage, the remaining power reduction amount that needs to be adjusted in the second stage is determined.

[0098] As an exemplary embodiment, the power reduction amount adjusted in the first stage can be determined based on the difference between the real-time value of the full-field power at the beginning of the first stage and the real-time value of the full-field power at the end of the first stage; and then the difference between the full-field power reduction amount and the power reduction amount adjusted in the first stage is used as the remaining power reduction amount that needs to be adjusted in the second stage.

[0099] In step S502 , based on the remaining power reduction amount, the single-unit power reduction amount that needs to be adjusted by each wind turbine in the second stage is determined.

[0100] As an exemplary embodiment, the individual power reduction amount required to be adjusted may be allocated to each wind turbine based on the remaining power reduction amount and the power reduction amount of each wind turbine.

[0101] In step S503, based on the adjustment time parameters, the adjustment time of the first stage, the single-machine power reduction of each wind turbine and the control coefficient, the target adjustment rate for limiting the power output on the grid side (i.e., the grid side of the converter) of each wind turbine in the second stage is determined.

[0102] As an exemplary embodiment, the adjustment time of the first stage (i.e., the time spent in the first stage) can be rounded to obtain a first time value, and the difference between the adjustment time parameter and the first time value is used as the second time value t2; then, for each wind turbine, the target adjustment rate of the grid-side power output limit of the wind turbine in the second stage is calculated. Among them, Deltp break[i] Indicates the power reduction of the single fan that needs to be adjusted in the second stage. represents the control coefficient.

[0103] Because the braking resistor cannot accurately control the power, a control coefficient needs to be added , and adjust the control coefficient according to the actual situation and specific needs For example, if the power regulation speed is slow and the actual power response is small, increase the regulation coefficient. Otherwise, the control coefficient is reduced .

[0104] In addition, according to the exemplary embodiment of the present disclosure, the method of controlling the wind turbine in the second stage by simultaneously using a non-braking resistor power reduction method and a braking resistor to reduce power may also include: sending to each wind turbine the single-machine power reduction amount that requires the wind turbine to be adjusted, the target adjustment rate of the non-braking resistor power reduction method (for example, the target adjustment rate of primary frequency regulation or the target adjustment rate of inertia response), and the target adjustment rate of the grid-side power output limitation to control the wind turbine to complete the second stage of power reduction adjustment.

[0105] It should be understood that for a wind turbine that does not have the power reduction capability of a braking resistor, it is not necessary to calculate and send the target regulation rate for limiting the power output on the grid side.

[0106] Figure 5 An example of a fast power reduction curve for a wind turbine in the event of severe overfrequency is shown. Assume that the wind turbine needs to reduce Pn by 50%. 单机 , P1(t) represents the control response according to primary frequency modulation (for example, controlling the wind turbine pitch to reduce wind energy and reduce the output power of the generator), and P2(t) represents the control response of grid-side power limitation (that is, the grid-side converter limits the active power output). There is a speed difference between the two, and the energy of this difference is consumed by the braking resistor. That is, the black shaded area in the middle represents the power absorbed by the braking resistor.

[0107] As an example of the present disclosure, compared with the first stage, the target regulation rate of the grid-side power output limitation of the wind turbine in the second stage is higher. Since the braking resistor is not enabled in the first stage, the target regulation rate of the non-braking resistor power reduction method in the first stage is the target regulation rate of the grid-side power output limitation.

[0108] like Figure 6 and Figure 7 As shown, compared with Figure 5 The braking resistor starting power point is reduced, which reduces the braking resistor consumption in the shaded area. Figure 6 and Figure 7 The slope of the P3 line in the 0-t3 period (i.e., the first stage) (indicating the target regulation rate of the non-braking resistor power reduction method) is greater than the slope of the P4 line in the t3 to t4 period (i.e., the second stage) (indicating the target regulation rate of the grid-side power output limitation). That is, during the entire regulation process, the variable speed regulation limits the grid-side power output of the wind turbine. By using the variable speed method, the power point is first lowered, and then the braking resistor is enabled to reduce the power at a larger slope (less than the low wear). In fact, compared to Figure 5 The slopes of the P2 and P4 lines are also greater. According to exemplary embodiments of the present disclosure, from the perspective of response speed, an appropriate speed can be selected between the primary frequency modulation speed and the low-pass response speed, or even implemented using a variable speed method, minimizing the increase in the brake resistor capacity and reducing costs.

[0109] As another example of the present disclosure, the target adjustment rate of the non-braking resistance power reduction mode of the wind turbine in the second stage is lower than that in the first stage. Figure 7 As shown, compared with the slope of the P3 line in the time period 0-t3, the slope of the P3 line in the time period t3 to t4 is smaller, that is, during the entire adjustment process, the target adjustment rate of the non-braking resistor power reduction method changes.

[0110] According to the above exemplary embodiments of the present disclosure, a time-sharing variable rate control method for rapid power reduction is proposed.

[0111] Figure 12 A structural block diagram of a wind farm power reduction control device according to an exemplary embodiment of the present disclosure is shown.

[0112] like Figure 12 As shown, the power reduction control device for a wind farm according to an exemplary embodiment of the present disclosure includes: an adjustment amount determination unit 100 , an inertia adjustment time determination unit 200 , and a wind turbine control unit 300 .

[0113] The adjustment amount determination unit 100 is configured to determine, in response to the frequency of the grid connection point being greater than an overfrequency threshold parameter, an overall power reduction amount requiring wind farm adjustment based on the adjustment amount parameter.

[0114] The inertia adjustment time determination unit 200 is configured to calculate the inertia adjustment time required to complete the full-field power reduction amount by adopting the inertia response.

[0115] The wind turbine control unit 300 is configured to, in response to the inertia adjustment time being less than or equal to the adjustment time parameter, cause the wind turbines in the wind farm to reduce power using non-braking resistors.

[0116] An overfrequency threshold parameter for defining a lower limit value of a severe overfrequency range, an adjustment amount parameter for defining an adjustment amount requirement for rapid power reduction, and an adjustment time parameter for defining an adjustment time requirement for rapid power reduction are preset.

[0117] As an exemplary embodiment, the wind turbine control unit 300 may be configured to: in response to the inertia adjustment time being greater than the adjustment time parameter, calculate the braking resistor activation amount required to complete the full-field power reduction using the inertia response and the braking resistor; in response to the braking resistor activation amount being greater than a preset threshold, control the wind turbine to use the braking resistor to reduce power; in response to the braking resistor activation amount being less than or equal to the preset threshold, control the field-level centralized energy storage system or the wind turbine energy storage system to reduce power instead of the braking resistor.

[0118] As an exemplary embodiment, the fan control unit 300 may be configured to: in the first stage, control the fan to reduce power by using a non-braking resistor power reduction method, and then in the second stage, control the fan to reduce power by using both a non-braking resistor power reduction method and a braking resistor.

[0119] As an exemplary embodiment, compared with the first stage, the target regulation rate for limiting the grid-side power output of the wind turbine is higher in the second stage.

[0120] As an exemplary embodiment, compared with the first stage, the target regulation rate of the non-braking resistor power reduction mode of the wind turbine in the second stage is lower.

[0121] As an exemplary embodiment, the wind turbine control unit 300 can be configured to: determine the remaining power reduction amount that needs to be adjusted in the second stage based on the total power reduction amount and the real-time value of the total power at the end of the first stage; determine the single-machine power reduction amount that needs to be adjusted for each wind turbine in the second stage based on the remaining power reduction amount; determine the target adjustment rate of the grid-side power output limit of each wind turbine in the second stage based on the adjustment time parameter, the adjustment time of the first stage, the single-machine power reduction amount of each wind turbine and the control coefficient.

[0122] As an exemplary embodiment, the wind turbine control unit 300 may be configured to control the wind turbine to reduce power by adopting at least one of inertia response, primary frequency regulation, and a wind turbine energy storage system.

[0123] As an exemplary embodiment, the wind turbine control unit 300 can be configured to: control the wind turbine to reduce power only by inertia response; or, control the wind turbine to first reduce power by inertia response, and then reduce power by primary frequency modulation; or, control the wind turbine to first reduce power by primary frequency modulation, and then reduce power by inertia response; or, control the wind turbine to reduce power by inertia response, and control the field-level centralized energy storage system to reduce power; or, control the wind turbine to reduce power by inertia response and the wind turbine energy storage system.

[0124] As an exemplary embodiment, the wind turbine control unit 300 can be configured to: determine the power reduction amount of the field-level centralized energy storage system and the inertia power reduction amount of each wind turbine; in accordance with the principle of making full use of the power reduction amount of the field-level centralized energy storage system, based on the power reduction amount of the entire field, the power reduction amount of the field-level centralized energy storage system and the inertia power reduction amount of each wind turbine, simultaneously control the field-level centralized energy storage system to reduce power and each wind turbine to reduce power using inertia response.

[0125] As an exemplary embodiment, the wind turbine control unit 300 can be configured to: determine the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, and in accordance with the principle of making full use of the power reduction amount of the wind turbine energy storage system, based on the overall power reduction amount, the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, control each wind turbine to simultaneously adopt inertia response and the wind turbine energy storage system to reduce power; or, based on the single-machine power reduction amount that needs to be adjusted by each wind turbine, issue a power adjustment instruction to each wind turbine separately, so that each wind turbine adopts inertia response and the wind turbine energy storage system to reduce power according to the received power adjustment instruction.

[0126] It should be understood that the specific processing performed by the power reduction control device of the wind farm according to the exemplary embodiment of the present disclosure has been referred to. Figures 2 to 11 The details are described in detail and will not be repeated here.

[0127] It should be understood that the various units in the wind farm power reduction control device according to the exemplary embodiments of the present disclosure may be implemented as hardware components and / or software components. Those skilled in the art may implement the various units using, for example, a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), depending on the processing performed by the defined units.

[0128] According to an exemplary embodiment of the present disclosure, a controller of a wind farm includes: a processor (not shown) and a memory (not shown), wherein the memory stores a computer program, and when the computer program is executed by the processor, the power reduction control method of the wind farm as described in the above exemplary embodiment is implemented.

[0129] According to an exemplary embodiment of the present disclosure, a computer-readable storage medium storing instructions may also be provided, wherein when the instructions are executed by at least one processor, the at least one processor is prompted to execute the power reduction control method for a wind farm as described in the above exemplary embodiment. Examples of computer-readable storage media here include: read-only memory (ROM), random access programmable read-only memory (PROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), flash memory, non-volatile memory, CD-ROM, CD-R, CD+R, CD-RW, CD+RW, DVD-ROM, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-RAM, BD-ROM, BD-R, BD-R LTH, BD-RE, Blu-ray or optical disk storage, hard disk drive (HDD), solid state drive (SSD), card storage (such as, multimedia card, secure digital (SD) card or ultra-fast digital (XD) card), magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk and any other device, any other device configured to store the computer program and any associated data, data files and data structures in a non-transitory manner and provide the computer program and any associated data, data files and data structures to a processor or computer so that the processor or computer can execute the computer program. The computer program in the above-mentioned computer-readable storage medium can be run in an environment deployed in a computer device such as a client, a host, an agent device, a server, etc. In addition, in one example, the computer program and any associated data, data files and data structures are distributed on a networked computer system so that the computer program and any associated data, data files and data structures are stored, accessed and executed in a distributed manner by one or more processors or computers.

[0130] According to an exemplary embodiment of the present disclosure, a computer program product may be provided. Instructions in the computer program product may be executed by at least one processor to implement the power reduction control method for a wind farm as described in the above exemplary embodiment.

[0131] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the claims.

[0132] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for controlling power reduction of a wind farm, characterized in that: include: In response to the frequency of the grid connection point being greater than an overfrequency threshold parameter, determining a field-wide power reduction amount that requires wind farm regulation based on an adjustment amount parameter; Calculating the inertia adjustment time required to complete the full-field power reduction using the inertia response; In response to the inertia adjustment time being less than or equal to the adjustment time parameter, controlling the wind turbines in the wind farm to reduce power by adopting a non-braking resistor power reduction method; Among them, an overfrequency threshold parameter for limiting the lower limit of the severe overfrequency range, an adjustment amount parameter for limiting the adjustment amount requirement for rapid power reduction, and an adjustment time parameter for limiting the adjustment time requirement for rapid power reduction are preset.

2. The power reduction control method according to claim 1, wherein: Also includes: In response to the inertia adjustment time being greater than the adjustment time parameter, calculating a braking resistor activation amount required to complete the full-field power reduction amount using an inertia response and a braking resistor; In response to the braking resistor activation amount being greater than a preset threshold, controlling the fan to reduce power using the braking resistor; In response to the braking resistor activation amount being less than or equal to the preset threshold, the field-level centralized energy storage system or the wind turbine energy storage system is controlled to reduce power instead of the braking resistor.

3. The power reduction control method according to claim 2, wherein: The step of controlling the fan to reduce power by using a braking resistor comprises: In the first stage, the fan is controlled to reduce power by using a non-braking resistor power reduction method, and then in the second stage, the fan is controlled to reduce power by using both a non-braking resistor power reduction method and a braking resistor.

4. The power reduction control method according to claim 3, wherein: Compared with the first stage, the target regulation rate of the grid-side power output limit of the wind turbine is higher in the second stage; And / or, compared with the first stage, the target regulation rate of the non-braking resistor power reduction mode of the wind turbine in the second stage is lower.

5. The power reduction control method according to claim 3 or 4, characterized in that: The step of controlling the fan in the second stage to reduce power by simultaneously using a non-braking resistor power reduction method and a braking resistor includes: Determining a remaining power reduction amount that needs to be adjusted in the second stage based on the full-field power reduction amount and the full-field power real-time value at the end of the first stage; Based on the remaining power reduction amount, determining a single-unit power reduction amount that needs to be adjusted for each wind turbine in the second stage; Based on the adjustment time parameter, the adjustment time of the first stage, the single-machine power reduction of each wind turbine and the control coefficient, a target adjustment rate for limiting the grid-side power output of each wind turbine in the second stage is determined.

6. The power reduction control method according to claim 1, wherein: The step of controlling the wind turbines in the wind farm to reduce power by adopting a non-braking resistor power reduction method comprises: The fan is controlled to reduce power by using at least one of inertia response, primary frequency modulation, and a fan energy storage system.

7. The power reduction control method according to claim 6, wherein: The step of controlling the wind turbine to reduce power by using at least one of inertia response, primary frequency modulation, and wind turbine energy storage system comprises: Control the fan to reduce power only by inertia response; Alternatively, the fan can be controlled by first using inertia response to reduce power, and then using primary frequency modulation to reduce power; Alternatively, the fan can be controlled by first using primary frequency modulation to reduce power, and then using inertia response to reduce power; Alternatively, the wind turbines can be controlled to reduce power using inertia response, and the field-level centralized energy storage system can be controlled to reduce power; Alternatively, wind turbines can be controlled using inertia response and wind turbine energy storage systems to reduce power.

8. The power reduction control method according to claim 7, wherein: The steps of controlling the wind turbine to reduce power by adopting inertia response and controlling the field-level centralized energy storage system to reduce power include: Determine the power reduction capacity of the field-level centralized energy storage system and the power reduction capacity of each wind turbine's inertia; In accordance with the principle of making full use of the power reduction capacity of the field-level centralized energy storage system, based on the power reduction amount of the entire field, the power reduction capacity of the field-level centralized energy storage system and the inertia power reduction capacity of each wind turbine, the field-level centralized energy storage system is controlled to reduce power and each wind turbine is controlled to reduce power using inertia response.

9. The power reduction control method according to claim 7, wherein: The steps of controlling the wind turbine to reduce power by using inertia response and a wind turbine energy storage system include: Determine the inertia power reduction amount of each wind turbine and the power reduction amount of the wind turbine energy storage system, and in accordance with the principle of maximizing the power reduction amount of the wind turbine energy storage system, control each wind turbine to simultaneously use inertia response and the wind turbine energy storage system to reduce power based on the overall power reduction amount, the inertia power reduction amount of each wind turbine, and the power reduction amount of the wind turbine energy storage system; Alternatively, a power adjustment instruction is issued to each wind turbine based on the power reduction amount of each wind turbine that needs to be adjusted, so that each wind turbine reduces power by simultaneously using inertia response and the wind turbine energy storage system according to the received power adjustment instruction.

10. A power reduction control device for a wind farm, characterized in that: include: an adjustment amount determining unit configured to determine, in response to the frequency of the grid connection point being greater than an overfrequency threshold parameter, an amount of overall power reduction requiring wind farm adjustment based on the adjustment amount parameter; an inertia adjustment time determination unit configured to calculate the inertia adjustment time required to complete the full-field power reduction using the inertia response; a wind turbine control unit configured to, in response to the inertia adjustment time being less than or equal to an adjustment time parameter, reduce power of wind turbines in the wind farm using non-braking resistors; Among them, an overfrequency threshold parameter for limiting the lower limit of the severe overfrequency range, an adjustment amount parameter for limiting the adjustment amount requirement for rapid power reduction, and an adjustment time parameter for limiting the adjustment time requirement for rapid power reduction are preset.

11. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the computer program causes the processor to execute the power reduction control method for a wind farm according to any one of claims 1 to 9.

12. A wind farm controller, characterized in that: include: processor; The memory stores a computer program, which, when executed by a processor, prompts the processor to execute the power reduction control method for a wind farm according to any one of claims 1 to 9.

13. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the power reduction control method for a wind farm according to any one of claims 1 to 9 is implemented.

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