Wind power plant quasi-steady-state voltage control method, device and system for coordinating energy storage

Abstract

The invention discloses a wind power plant quasi-steady-state voltage control method, device and system for coordinating energy storage, and belongs to the technical field of wind power generation control, and the method comprises the steps: firstly starting quasi-steady-state voltage support control based on the voltage information of a common coupling point of a wind power plant in a voltage support process after a system fault is cleared; the wind turbine group and the centralized energy storage enter a first voltage support stage; the stored energy quickly absorbs active power, and the wind turbine group emits reactive power according to respective capability; and when the active-voltage coupling degree is supported to be small, entering a second voltage support stage, enabling the energy storage to quit active power absorption, enabling the wind turbine group to recover the active power, and quitting reactive power compensation until the voltage recovery of the wind power plant is completed. According to the method, power output of wind turbine groups and energy storage in the wind power plant is coordinated, the effect and stability of quasi-steady-state voltage supporting can be improved by utilizing the coupling effect of active power and voltage, and finally rapid recovery of the quasi-steady-state voltage of the wind power plant after system faults are cleared is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation control, and more specifically, relates to a quasi-steady-state voltage control method, device and control system for a wind farm coordinated with energy storage. Background Art

[0002] Wind power has been rapidly developed due to its advantages of cleanliness and low cost. However, as synchronous machines are gradually replaced by wind power in the system, the voltage support capacity of the system is weakened and the strength of the grid is reduced. When the fault is cleared, the quasi-steady-state voltage of the wind farm recovers slowly. In serious cases, the wind farm disconnection will further deteriorate the stability of the system. The quasi-steady-state voltage support provided by the wind farm is of great significance to the stable operation of the grid.

[0003] During low voltage periods, wind farm units can flexibly control the output power of power electronic converters to support the voltage at the common coupling point of the station. Existing voltage support mostly adopts the control of additional reactive power. Reactive droop control based on measured voltage is the most common in engineering. Dynamic reactive support control considering current limitation and maximizing voltage support control using reactive power have also been studied. However, due to the quasi-steady state after the fault is cleared, wind turbines also need to restore active power to avoid wind abandonment and system instability. Therefore, the impact of active power on voltage in quasi-steady-state voltage support should also be considered. Studies have shown that the recovery of active power in the quasi-steady-state process will deteriorate the recovery of voltage. Therefore, the quasi-steady-state voltage of wind farms needs to design and control both active and reactive power dynamics.

[0004] However, how to coordinate the centralized energy storage within the wind farm to design a quasi-steady-state voltage that can dynamically control the wind farm using both active power and reactive power is an urgent problem to be solved. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a quasi-steady-state voltage control method, device and control system for a wind farm coordinated with energy storage, the purpose of which is to solve the technical problem of how to design a quasi-steady-state voltage that can dynamically control the wind farm by simultaneously utilizing active power and reactive power.

[0006] To achieve the above object, according to one aspect of the present invention, a quasi-steady-state voltage control method for a wind farm coordinated with energy storage is provided, comprising: S1: When the voltage at the common coupling point of the wind farm meets the quasi-steady-state support start-up criterion, the wind turbines and centralized energy storage in the wind farm are controlled to enter the first voltage support stage; S2: In the first voltage support stage, each wind turbine in the wind turbine group is controlled to increase reactive power, and the centralized energy storage is controlled to absorb active power to a maximum value; S3: If the voltage at the common coupling point of the wind farm in the system meets the active power-voltage weak coupling condition in the first voltage support stage, control the wind turbine group and the centralized energy storage to enter the second voltage support stage; S4: In the second voltage support stage, the centralized energy storage is controlled to exit active power absorption until the absorbed power is zero; then, the wind turbines are controlled to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and reactive power compensation is exited; S5: When the voltage recovery completion conditions are met, the wind turbine group and the centralized energy storage are controlled to exit the quasi-steady-state voltage support control.

[0007] In one embodiment, the quasi-steady-state support start-up criterion includes: the common coupling point voltage U PCC The voltage is lower than the first voltage threshold and increases suddenly by a value Δ within a first preset period of time. U PCC is greater than the second voltage threshold.

[0008] In one embodiment, controlling each wind turbine in the wind turbine group to increase reactive power in S2 includes: The total reactive power reference value for controlling the wind turbine group is ; The reactive power reference value for controlling the i-th wind turbine in the wind turbine group is: ; in, K 0 , are the boundary coefficient and the droop coefficient, respectively. U PCC is the common coupling point voltage, U ref is the reference voltage at the common coupling point, S max is the maximum capacity of a single wind turbine grid-side converter, S WTi For the i The actual apparent power generated by the typhoon.

[0009] In one of the embodiments, controlling the centralized energy storage to absorb active power to a maximum value in S2 includes: controlling the centralized energy storage to absorb active power to a maximum value according to a ramp and a preset rate.

[0010] In one embodiment, the active power-voltage weak coupling condition includes: the coupling degree between the output active power of the wind farm and the voltage at the common coupling point is less than a coupling threshold and the voltage at the common coupling point is constant within a continuous second preset period of time. UPCC is greater than a third voltage threshold.

[0011] In one embodiment, the coupling degree use Calculated; among them, P WF , Q WF are the total active power and reactive power output of the wind farm, To simplify the identifier for the calculation, , is the ratio of the wind farm access system line impedance to the system equivalent impedance, U K is the voltage of the node of the wind farm connected to the system through the line, and SCR is the short-circuit ratio of the wind farm connected to the system.

[0012] In one embodiment, the voltage recovery completion condition includes: the common coupling point voltage U PCC Within a third preset time period, the voltage is not lower than the third voltage threshold and is not higher than the fourth voltage threshold.

[0013] According to another aspect of the present invention, there is provided a quasi-steady-state voltage control device for a wind farm coordinated with energy storage, comprising: A start-up module, used to control the wind turbines and centralized energy storage in the wind farm to enter the first voltage support stage when the voltage at the common coupling point of the system wind farm meets the quasi-steady-state support start-up criterion; A first support module is used to control each wind turbine in the wind turbine group to increase reactive power and control the centralized energy storage to absorb active power to a maximum value in the first voltage support stage; A switching module, configured to control the wind turbine group and the centralized energy storage to enter a second voltage support phase if the voltage at the common coupling point of the wind farm in the system meets the active power-voltage weak coupling condition in the first voltage support phase; The second support module is used to control the centralized energy storage to exit active power absorption until the absorbed power is zero in the second voltage support stage; then, control the wind turbine to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and exit reactive power compensation; The exit module is used to control the wind turbine group and the centralized energy storage to exit the quasi-steady-state voltage support control when the voltage recovery completion condition is met.

[0014] According to another aspect of the present invention, a control system for a wind farm is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method described above when executing the computer program.

[0015] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method described above are implemented.

[0016] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art: (1) This solution provides a quasi-steady-state voltage support strategy for wind farms that coordinates energy storage. During the voltage support process after the system fault is cleared, the quasi-steady-state voltage support control is first started based on the voltage information of the common coupling point of the wind farm, and the wind turbine group and energy storage enter the first voltage support stage; the energy storage quickly absorbs active power, and the wind turbine group generates reactive power according to their respective capabilities; when the active power-voltage coupling degree is small, the second voltage support stage is entered, the energy storage exits active power absorption, the wind turbine group restores active power and exits reactive power compensation until the wind farm voltage is restored. The present invention coordinates the power output of the wind turbine group and energy storage in the wind farm, and utilizes the coupling effect of active power and voltage to improve the effect and stability of the quasi-steady-state voltage support, and ultimately achieves rapid recovery of the quasi-steady-state voltage of the wind farm after the system fault is cleared.

[0017] (2) The quasi-steady-state support start-up criteria described in this scheme include: the voltage at the common coupling point U PCC The voltage is lower than the first voltage threshold and increases suddenly by a value Δ within a first preset period of time. U PCC This method takes into account that the detection information comes from the common coupling point of the wind farm, does not require detailed fault information, and realizes the quasi-steady-state voltage support startup based on local information.

[0018] (3) This scheme designs the reactive power control of the wind turbine group based on the Logistic function. This method takes into account the problem of a large reduction in reactive power when the voltage difference is reduced during support. Through the design, the wind farm can still smoothly provide more reactive power, achieve quasi-steady-state rapid voltage support, and help reduce the recovery period.

[0019] (4) The active power-voltage weak coupling condition considered in this scheme includes: the coupling degree between the output active power of the wind farm and the voltage at the common coupling point is less than the coupling threshold and the voltage at the common coupling point is U PCC Greater than the third voltage threshold This method designs automatic switching of the quasi-steady-state voltage support stage based on the change in coupling strength between active power and voltage during the voltage support process, which facilitates active power recovery and minimizes voltage deterioration.

[0020] (5) This scheme considers the coupling degree calculation formula under the condition of weak active power-voltage coupling, quantifies the coupling relationship between the active power and voltage of the wind farm, takes into account the system short-circuit ratio, real-time voltage and other information, and is conducive to obtaining the coupling strength of active power and voltage in the current state.

[0021] (6) The voltage recovery completion conditions described in this scheme include: the voltage at the common coupling point U PCC The voltage is not lower than the third voltage threshold and not higher than the fourth voltage threshold within the third preset time period. This method is designed to identify the voltage recovery situation based on local information, and realizes automatic exit from the quasi-steady-state voltage support. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A flow chart of a quasi-steady-state voltage support strategy for a wind farm coordinated with energy storage provided in one embodiment of the present invention.

[0023] Figure 2 A schematic diagram of a framework of a quasi-steady-state voltage support control strategy for a wind farm provided in an embodiment of the present invention.

[0024] Figure 3 A schematic diagram of wind turbine and energy storage power coordination provided in one embodiment of the present invention.

[0025] Figure 4 The topology diagram of a wind farm grid-connected system used for quasi-steady-state voltage support testing in one embodiment of the present invention.

[0026] Figure 5a This is the voltage result of the common coupling point of the wind farm after a system failure in one embodiment of the present invention.

[0027] Figure 5b The figure is the active power output result of a wind farm with energy storage in one embodiment of the present invention.

[0028] Figure 5c The reactive power output result of a wind farm with energy storage in one embodiment of the present invention.

[0029] Figure 5d It is the output active power result of energy storage in the wind farm in one embodiment of the present invention.

[0030] Figure 5e This is a real-time calculation result of the wind farm coupling degree in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The actual wind farm parameters in a certain area are used as the example prototype. Based on the Matlab / Simulink platform, a wind farm with energy storage is connected to the IEEE four-machine two-region model, and the wind farm replaces a synchronous machine in the original system. The wind farm consists of 15 equivalent wind turbines and centralized energy storage. Each wind turbine is composed of 10 3.33MW direct-drive wind turbines. The wind power installed capacity penetration rate is 24.3%. The energy storage capacity is 10% of the wind turbine group capacity, that is, 50MW. The wind speed of the wind farm is set to 16.0m / s. The downstream wind turbine is affected by the wake effect. The disturbance is set to t = 5s, a three-phase short circuit fault occurs at 1 / 3 of the busbar 8 near the tie line 7-8. t = Cleared at 5.28s.

[0033] like Figure 1 As shown, a quasi-steady-state voltage support strategy for wind farms with coordinated energy storage is provided, which is applied to wind farms with centralized energy storage access points. The quasi-steady-state voltage support strategy specifically includes: S1: When the voltage at the common coupling point of the wind farm meets the quasi-steady-state support start-up criterion, the wind turbines and centralized energy storage in the wind farm are controlled to enter the first voltage support stage; S2: In the first voltage support stage, each wind turbine in the wind turbine group is controlled to increase reactive power, and the centralized energy storage is controlled to absorb active power to a maximum value; S3: If in the first voltage support stage, the public active power of the wind farm in the system is restored to the maximum power tracking reference value and the common coupling point voltage satisfies the active power-voltage weak coupling condition, then the wind turbine group and the centralized energy storage are controlled to enter the second voltage support stage; S4: In the second voltage support stage, the centralized energy storage is controlled to exit active power absorption until the absorbed power is zero; then, the wind turbines are controlled to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and reactive power compensation is exited; S5: When the voltage recovery completion conditions are met, the wind turbine group and the centralized energy storage are controlled to exit the quasi-steady-state voltage support control.

[0034] See also Figure 1 and Figure 2 , the design method is as follows: S1: When the voltage at the common coupling point of the wind farm meets the quasi-steady-state support start-up criterion, a quasi-steady-state voltage support start-up signal is generated; As an optional implementation, the quasi-steady-state support start-up criterion in S1 is: the voltage at the common coupling point of the wind farm U PCC Lower than 0.9 and with a sudden increase in value within 0.01s U PCC It should be noted that the above numerical design is only for illustration, and the actual parameters may be near the example parameters.

[0035] Specifically, the fault time in the test system is t =5s, fault clearing time is t =5.28s, by monitoring the voltage amplitude at the common coupling point of the wind farm, t =5.29s, the voltage amplitude increment meets the quasi-steady-state voltage support start-up criterion, and the quasi-steady-state voltage support strategy is started.

[0036] S2: When the quasi-steady-state voltage support start signal is received, the wind turbine group and the energy storage enter the first voltage support stage; wherein each wind turbine generates reactive power according to the control based on the Logistic function, and the energy storage absorbs active power quickly according to the ramp until the maximum value; As an optional implementation, the reactive power control of the wind turbine group in S2 based on the Logistic function is specifically as follows: The total reactive power output of the wind turbine group is, and the reactive power reference value of each wind turbine is further calculated; where, Q WF is the total reactive power output reference value of the wind turbine group, Q WTi It is i The reactive power output reference value of the typhoon generator, K 0 , are the boundary coefficient and droop coefficient respectively, U ref is the reference voltage at the common coupling point, S max is the maximum capacity of a single wind turbine grid-side converter, S WTi For the i The actual apparent power generated by the typhoon. Specifically, in the embodiment, K 0 = 5, = 5, U ref =1, S max It is 3.33MW.

[0037] S3: When the active power-voltage weak coupling condition is met, a voltage support phase switching signal is generated; as an optional implementation, the active power-voltage weak coupling condition in S3 is: the coupling degree between the active power output of the wind farm and the voltage at the common coupling point is And within 300ms, the voltage at the common coupling point of the wind farm U PCC >0.97. It should be noted that the above numerical design is only for illustration, and the actual parameters may be near the example parameters.

[0038] The coupling degree is obtained by calculation; wherein, P WF , Q WF are the total active power and reactive power output by the wind farm, respectively; is the simplified identifier of the calculation formula, is the ratio of the line impedance of the wind farm access system to the equivalent impedance of the system, U K is the voltage of the node of the wind farm connected to the system through the line, and SCR is the short-circuit ratio of the wind farm connected to the system.

[0039] Specifically, Figure 5a and Figure 5e As shown, when t =6.51s, the voltage at the common coupling point of the wind farm recovered to 0.97, and was not less than 0.97 within 300ms. The coupling degree calculated in real time was t =5.43s and thereafter Therefore, t =6.81s when the voltage support phase switching signal is generated.

[0040] S4: When the voltage support stage switching signal is received, the wind turbine group and the energy storage enter the second voltage support stage, and the energy storage quickly exits active power absorption according to the ramp until the absorbed power is 0; Specifically, after receiving the voltage support phase switching signal, the energy storage quickly exits active power absorption according to the ramp. t =7.01s to exit completely.

[0041] Furthermore, when the centralized energy storage completely exits active power absorption, the wind turbine group recovers active power according to the ramp until each wind turbine group recovers to the active power corresponding to the respective maximum power tracking, and gradually exits reactive power compensation; Specifically, wind turbines t =7.01s starts active power recovery and exits reactive power compensation. t =7.25s The active power recovers to the maximum power tracking reference value.

[0042] S5: When the voltage recovery completion conditions are met, the wind turbine group and energy storage exit the quasi-steady-state voltage support control; It should be noted that FIG3 is a schematic diagram of wind turbine and energy storage power coordination provided by an embodiment of the present invention. FIG4 is a topological diagram of a wind farm grid-connected system for quasi-steady-state voltage support test in an embodiment of the present invention. As an optional implementation, the voltage recovery completion condition in S5 is: the voltage at the common coupling point of the wind farm is U PCC The voltage at the common coupling point is not less than 0.97 and not more than 1.07 for a period of 2 seconds. U PCC All of them are in the range of 0.97~1.07, so t =9.01s Quasi-steady-state voltage support control exits. It should be noted that the above numerical design is only for illustration, and the actual parameters may be close to the example parameters.

[0043] The following is an explanation of the simulation data: The voltage results of the common coupling point of the wind farm after the system failure are as follows: Figure 5a As shown in Figure 2, the output active power of the wind farm with energy storage is as follows: Figure 5b As shown, the output reactive power result is as follows Figure 5c As shown, the output active power of the energy storage is as follows Figure 5d As shown, the real-time calculation results of coupling degree are as follows Figure 5e When the wind farm does not participate in voltage support, it does not generate reactive power during and after the system fault is cleared. Since the dynamic load in the comprehensive load absorbs a large amount of reactive power during this period, the voltage continues to be low, with a value of 0.66, and the voltage is unstable.

[0044] When dynamic voltage support control is adopted, the wind turbine increases reactive current according to the droop function after the fault is cleared. Since the reactive power increase is small near 0.9, the time to recover to the normal operating range is slow. The voltage recovery time from fault clearance to voltage recovery to the normal operating range is t 3 =2.97s; when dynamic reactive power control is adopted, the reactive current increases according to the step time to support, but after the fault is cleared, the short-term voltage reaches above 0.9 and then automatically exits reactive power compensation. The subsequent voltage recovery is slow, and the voltage recovery time is t 2 =4.98s; the proposed quasi-steady-state voltage support control t =5.29s, the quasi-steady-state voltage support control starts and enters the first stage of voltage support. While the energy storage absorbs active power, the wind turbine quickly increases reactive power according to the proposed function. t =6.81s to enter the second stage of voltage support, and the voltage recovery time is t1 =1.23s. The voltage recovery time is the shortest, thus achieving fast quasi-steady-state voltage support.

[0045] In another embodiment, a quasi-steady-state voltage control device for a wind farm coordinated with energy storage is provided, comprising: A start-up module, used to control the wind turbines and centralized energy storage in the wind farm to enter the first voltage support stage when the voltage at the common coupling point of the system wind farm meets the quasi-steady-state support start-up criterion; A first support module is used to control each wind turbine in the wind turbine group to increase reactive power and control the centralized energy storage to absorb active power to a maximum value in the first voltage support stage; A switching module, configured to control the wind turbine group and the centralized energy storage to enter a second voltage support phase if the voltage at the common coupling point of the wind farm in the system meets the active power-voltage weak coupling condition in the first voltage support phase; The second support module is used to control the centralized energy storage to exit active power absorption until the absorbed power is zero in the second voltage support stage; then, control the wind turbine to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and exit reactive power compensation; The exit module is used to control the wind turbine group and the centralized energy storage to exit the quasi-steady-state voltage support control when the voltage recovery completion condition is met.

[0046] In another embodiment, a control system for a wind farm is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method when executing the computer program.

[0047] In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described above are implemented.

[0048] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A quasi-steady-state voltage control method for a wind farm coordinated with energy storage, characterized in that: include: S1: When the voltage at the common coupling point of the wind farm meets the quasi-steady-state support start-up criterion, the wind turbines and centralized energy storage in the wind farm are controlled to enter the first voltage support stage; S2: In the first voltage support stage, each wind turbine in the wind turbine group is controlled to increase reactive power, and the centralized energy storage is controlled to absorb active power to a maximum value; S3: If the voltage at the common coupling point of the wind farm in the system meets the active power-voltage weak coupling condition in the first voltage support stage, control the wind turbine group and the centralized energy storage to enter the second voltage support stage; S4: In the second voltage support stage, the centralized energy storage is controlled to exit active power absorption until the absorbed power is zero; then, the wind turbines are controlled to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and reactive power compensation is exited; S5: When the voltage recovery completion conditions are met, the wind turbine group and the centralized energy storage are controlled to exit the quasi-steady-state voltage support control.

2. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage according to claim 1, characterized in that: The quasi-steady-state support start-up criteria include: the common coupling point voltage U PCC The voltage is lower than the first voltage threshold and increases suddenly by a value Δ within a first preset period of time. U PCC is greater than the second voltage threshold.

3. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage according to claim 1, characterized in that: The step S2 of controlling each wind turbine in the wind turbine group to increase reactive power comprises: The total reactive power reference value for controlling the wind turbine group is ; The reactive power reference value for controlling the i-th wind turbine in the wind turbine group is: ； in, K 0. are the boundary coefficient and the droop coefficient, respectively. U PCC is the common coupling point voltage, U ref is the reference voltage at the common coupling point, S max is the maximum capacity of the grid-side converter of a single wind turbine, S WTi For the i The actual apparent power generated by the typhoon.

4. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage as claimed in claim 3, characterized in that: In S2, controlling the centralized energy storage to absorb active power to a maximum value includes: controlling the centralized energy storage to absorb active power to a maximum value according to a ramp and a preset rate.

5. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage as claimed in claim 1, characterized in that: The active power-voltage weak coupling condition includes: the coupling degree between the output active power of the wind farm and the voltage at the common coupling point is less than a coupling threshold and the voltage at the common coupling point is constant within a continuous second preset period of time. U PCC is greater than a third voltage threshold.

6. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage as claimed in claim 5, characterized in that: The degree of coupling use Calculated; in, P WF , Q WF are the total active power and reactive power output of the wind farm, To simplify the identifier for the calculation, , is the ratio of the wind farm access system line impedance to the system equivalent impedance, U K is the voltage of the node of the wind farm connected to the system through the line, and SCR is the short-circuit ratio of the wind farm connected to the system.

7. The quasi-steady-state voltage control method for a wind farm with coordinated energy storage according to any one of claims 1 to 6, characterized in that: The voltage recovery completion condition includes: the common coupling point voltage U PCC Within a third preset time period, the voltage is not lower than the third voltage threshold and is not higher than the fourth voltage threshold.

8. A quasi-steady-state voltage control device for a wind farm coordinated with energy storage, characterized in that: include: A start-up module, used to control the wind turbines and centralized energy storage in the wind farm to enter the first voltage support stage when the voltage at the common coupling point of the system wind farm meets the quasi-steady-state support start-up criterion; A first support module is used to control each wind turbine in the wind turbine group to increase reactive power and control the centralized energy storage to absorb active power to a maximum value in the first voltage support stage; A switching module, configured to control the wind turbine group and the centralized energy storage to enter a second voltage support phase if the voltage at the common coupling point of the wind farm in the system meets the active power-voltage weak coupling condition in the first voltage support phase; The second support module is used to control the centralized energy storage to exit active power absorption until the absorbed power is zero in the second voltage support stage; then, control the wind turbine to restore active power until each wind turbine is restored to the active power corresponding to the respective maximum power tracking, and exit reactive power compensation; The exit module is used to control the wind turbine group and the centralized energy storage to exit the quasi-steady-state voltage support control when the voltage recovery completion condition is met.

9. A control system for a wind farm, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images