Reactive voltage control method, system, electronic device and storage medium of wind farm

Abstract

The present disclosure relates to a reactive voltage control method, system, electronic device and storage medium for a wind farm, comprising: obtaining electrical measurement values, control instruction reference values and reactive power capability limits of each reactive power source currently in a normal operating state; obtaining a reactive power target value of a wind farm grid connection point; performing delay filtering on original sum values of the reactive power capability limits of each reactive power source to obtain delay sum values; determining a reactive power instruction target value of the wind farm; and determining a corresponding reactive power instruction value of each reactive power source based on the reactive power instruction target value, the delay sum values and the reactive power capability limits of each reactive power source. In the process of calculating the reactive power capability of the reactive power source group, the present disclosure does not directly use the real-time reactive power capability of the reactive power source group, but performs delay filtering on the real-time reactive power capability of the reactive power source group, which can avoid sudden changes in the actual reactive power capability of the reactive power source group, and in turn can avoid sudden changes in the reactive power distribution instruction, thereby improving the reliability of reactive power control and the stability of system operation.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation technology, and more specifically, to reactive voltage control methods, systems, electronic devices, and storage media for wind farms. Background Technology

[0002] Currently, reactive power allocation to wind turbines is often based on the overall reactive power capacity of the wind farm. However, during actual operation, due to their distributed nature and relatively small capacity, wind turbines often experience partial grid connection, batch start-ups and shutdowns, or communication interruptions. When a group of turbines shuts down, the state changes occur within a short period, typically a few hundred milliseconds. This causes a rapid and significant increase in reactive power commands for the controlled turbines within a short timeframe. Furthermore, if communication is immediately restored after a batch of interruptions, the reactive power commands for the controlled turbines will decrease rapidly within a short period.

[0003] It is evident that under these circumstances, the actual reactive power of the wind turbine group will change suddenly, which may cause abnormalities and fluctuations in the overall reactive power control. In severe cases, it may even cause the wind turbine to fail and shut down, and damage the equipment. Therefore, in related technologies, the stability and reliability of reactive power control of wind turbines are relatively poor. Summary of the Invention

[0004] This disclosure provides a reactive power and voltage control method, system, electronic equipment, and storage medium for wind farms, in order to at least solve the problem of poor stability and reliability of reactive power control of wind turbine units in the aforementioned related technologies.

[0005] According to a first aspect of the present disclosure, a reactive power voltage control method for a wind farm is provided, comprising: acquiring electrical measurement values ​​at the wind farm's grid connection point, reference values ​​of control commands issued by the power grid to the wind farm, and reactive power capacity limits for each reactive power source currently in normal operation at the wind farm; acquiring a reactive power target value at the wind farm's grid connection point based on at least one of the electrical measurement values ​​and the control command reference values; acquiring the original sum of the reactive power capacity limits for each reactive power source; performing a delay filter on the original sum to obtain a delayed sum; determining a reactive power command target value for the wind farm based on the reactive power target value, the electrical measurement values, and the delayed sum; determining a reactive power command value corresponding to each reactive power source based on the reactive power command target value, the delayed sum, and the reactive power capacity limits for each reactive power source; and controlling each reactive power source to output reactive power according to the reactive power command value corresponding to each reactive power source; wherein the delay filter is used to control the original sum to change with a delay within a preset time period.

[0006] Optionally, obtaining the reactive power limit of each reactive source currently in normal operation in the wind farm includes: obtaining the reactive power limit of each reactive source currently in normal operation in the reactive source group of the wind farm when multiple reactive sources included in the reactive source group of the wind farm are shut down or started and stopped in batches, or when the generators are interrupted in batches.

[0007] Optionally, the inertial time constant corresponding to the delay filter has a value range of 0 seconds. <T s <60 seconds, where T s Let be the inertial time constant.

[0008] Optionally, the reactive power source includes a fan and a centralized reactive power compensation device.

[0009] Optionally, the electrical measurement values ​​include at least the reactive power measurement values ​​at the wind farm's grid connection point; determining the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement values, and the delay sum value includes: performing a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value to obtain a first limiting value; obtaining the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is a filtered value obtained by delay filtering the reactive power measurement values; performing PI control based on the reactive power difference value; and performing a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value.

[0010] Optionally, the original sum value includes the original capacitive sum value and the original inductive sum value, wherein the original capacitive sum value is the sum of the capacitive reactive power capacity limits of each reactive power source, and the original inductive sum value is the sum of the inductive reactive power capacity limits of each reactive power source; the step of performing a first limiting process on the reactive power target value using a preset reactive power command upper limit value and a preset reactive power command lower limit value to obtain a first limiting value includes: when the reactive power target value is greater than or equal to the preset reactive power command upper limit value, determining the preset reactive power command upper limit value as the first limiting value; when the reactive power target value is less than or equal to the preset reactive power command lower limit value, determining the preset reactive power command lower limit value as the first limiting value; and when the reactive power target value is less than the preset reactive power command upper limit value and greater than the preset reactive power command lower limit value, determining the reactive power target value as the first limiting value.

[0011] Optionally, the electrical measurement values ​​include the reactive power measurement values ​​and the voltage measurement values ​​at the wind farm grid connection point, and the control command reference values ​​include a voltage command reference value; obtaining the reactive power target value at the wind farm grid connection point based on at least one of the electrical measurement values ​​and the control command reference value includes: performing a delay filter on the voltage measurement values ​​to obtain a voltage filter value; obtaining the voltage difference between the voltage command reference value and the voltage filter value; obtaining the product of the voltage difference and a preset voltage droop coefficient as the reactive power change value; performing a delay filter on the reactive power measurement values ​​to obtain a reactive power filter value; and obtaining the sum of the reactive power change value and the reactive power filter value as the reactive power target value.

[0012] Optionally, obtaining the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement value and the control command reference value includes: obtaining the reactive power command reference value included in the control command reference value as the reactive power target value.

[0013] Optionally, the electrical measurement values ​​include the active power measurement values ​​of the wind farm grid connection point, and the control command reference values ​​include the power factor command reference values; obtaining the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement values ​​and the control command reference values ​​includes: obtaining the inverse cosine value of the power factor command reference value and the tangent value of the inverse cosine value; performing a delay filter on the active power measurement values ​​to obtain an active power filtered value; and obtaining the product of the active power filtered value and the tangent value as the reactive power target value.

[0014] Optionally, determining the reactive power command value corresponding to each reactive power source based on the reactive power command target value, the delay sum value, and the reactive power capacity limit value of each reactive power source includes: calculating the reactive power allocation ratio between the reactive power command target value and the delay sum value; and determining the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power command value corresponding to each reactive power source.

[0015] Optionally, the delay sum includes a delay capacitive sum and a delay inductive sum, wherein the delay capacitive sum and the delay inductive sum are obtained by delay filtering the original capacitive sum and the delay inductive sum included in the original sum; the delay inductive sum and the delay inductive sum are obtained by delay filtering the original inductive sum and the delay inductive sum; the calculation of the reactive power allocation ratio between the reactive power command target value and the delay sum includes: when the reactive power command target value is of the capacitive type, calculating the ratio of the reactive power command target value to the delay capacitive sum and the delay inductive sum as the reactive power allocation ratio; when the reactive power command target value is of the inductive type, calculating the ratio of the reactive power command target value to the delay inductive sum and the delay inductive sum as the reactive power allocation ratio.

[0016] Optionally, determining the product of the reactive power allocation ratio and the reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source includes: when the reactive power command target value is capacitive, determining the product of the reactive power allocation ratio and the capacitive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source; and when the reactive power command target value is inductive, determining the product of the reactive power allocation ratio and the inductive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source.

[0017] According to a second aspect of the present disclosure, a reactive power and voltage control system for a wind farm is provided, comprising: a parameter value acquisition module configured to acquire electrical measurement values ​​at the wind farm's grid connection point, control command reference values ​​issued by the power grid for the wind farm, and reactive power capacity limits for each reactive power source currently in normal operation at the wind farm; a reactive power target value acquisition module configured to acquire a reactive power target value at the wind farm's grid connection point based on at least one of the electrical measurement values ​​and the control command reference values; a raw sum value acquisition module configured to acquire the raw sum value of the reactive power capacity limits for each reactive power source; and a delay filtering module configured to perform a delay filtering on the raw sum value of the raw sum value. The sum is subjected to delay filtering to obtain a delayed sum; the reactive power command target value determination module is configured to determine the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement value, and the delayed sum; the reactive power command value determination module is configured to determine the reactive power command value corresponding to each reactive power source based on the reactive power command target value, the delayed sum, and the reactive power capacity limit value of each reactive power source; the reactive power output control module is configured to control each reactive power source to output reactive power according to the reactive power command value corresponding to each reactive power source; wherein, the delay filtering is used to control the original sum to change with delay within a preset time period.

[0018] Optionally, the parameter value acquisition module is configured to: in the event that multiple reactive sources included in the reactive source group of the wind farm are shut down in batches or communication is interrupted in batches, acquire the reactive power limit value of each reactive source currently in normal operation included in the reactive source group.

[0019] Optionally, the inertial time constant corresponding to the delay filter has a value range of 0 seconds. <T s <60 seconds, where T s Let be the inertial time constant.

[0020] Optionally, the reactive power source includes a fan and a centralized reactive power compensation device.

[0021] Optionally, the electrical measurement values ​​include at least the reactive power measurement values ​​at the wind farm grid connection point; the reactive power command target value determination module is configured to: perform a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value of the reactive power command to obtain a first limiting value; obtain the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is the filter value obtained by delaying the reactive power measurement value; perform PI control based on the reactive power difference; and perform a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value.

[0022] Optionally, the original sum value includes the original capacitive sum value and the original inductive sum value, wherein the original capacitive sum value is the sum of the capacitive reactive power capacity limits of each reactive power source, and the original inductive sum value is the sum of the inductive reactive power capacity limits of each reactive power source; the reactive power command target value determination module is configured to: determine the preset reactive power command upper limit value as the first limiting value when the reactive power target value is greater than or equal to the preset reactive power command lower limit value; determine the preset reactive power command lower limit value as the first limiting value when the reactive power target value is less than or equal to the preset reactive power command lower limit value; and determine the reactive power target value as the first limiting value when the reactive power target value is less than the preset reactive power command upper limit value and greater than the preset reactive power command lower limit value.

[0023] Optionally, the electrical measurement values ​​include the reactive power measurement values ​​and the voltage measurement values ​​at the wind farm grid connection point, and the control command reference values ​​include the voltage command reference values; the reactive power target value acquisition module is configured to: perform delayed filtering on the voltage measurement values ​​to obtain a voltage filter value; acquire the voltage difference between the voltage command reference value and the voltage filter value; acquire the product of the voltage difference and a preset voltage droop coefficient as the reactive power change value; perform delayed filtering on the reactive power measurement values ​​to obtain a reactive power filter value; and acquire the sum of the reactive power change value and the reactive power filter value as the reactive power target value.

[0024] Optionally, the reactive power target value acquisition module is configured to: acquire the reactive power instruction reference value contained in the control instruction reference value as the reactive power target value.

[0025] Optionally, the electrical measurement value includes the active power measurement value of the wind farm grid connection point, and the control command reference value includes the power factor command reference value; the reactive power target value acquisition module is configured to: acquire the inverse cosine value of the power factor command reference value and the tangent value of the inverse cosine value; perform delay filtering on the active power measurement value to obtain the active power filtered value; and acquire the product of the active power filtered value and the tangent value as the reactive power target value.

[0026] Optionally, the reactive power instruction value determination module is configured to: calculate the reactive power allocation ratio between the reactive power instruction target value and the delay sum value; and determine the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power instruction value corresponding to each reactive power source.

[0027] Optionally, the delay sum includes a delay capacitive sum and a delay inductive sum, wherein the delay capacitive sum and the delay inductive sum are obtained by delay filtering the original capacitive sum and the delay inductive sum included in the original sum; the delay inductive sum and the delay inductive sum are obtained by delay filtering the original inductive sum and the delay inductive sum included in the original sum; the reactive power command value determination module is configured to: when the reactive power command target value is of the capacitive type, calculate the ratio of the reactive power command target value to the delay capacitive sum and the delay inductive sum as the reactive power allocation ratio; when the reactive power command target value is of the inductive type, calculate the ratio of the reactive power command target value to the delay inductive sum and the delay inductive sum as the reactive power allocation ratio.

[0028] Optionally, the reactive power command value determination module is configured to: when the reactive power command target value is capacitive, determine the product of the reactive power allocation ratio and the capacitive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source; when the reactive power command target value is inductive, determine the product of the reactive power allocation ratio and the inductive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source.

[0029] According to a third aspect of the present disclosure, a new energy power station is provided, comprising: a reactive power and voltage control system for a wind farm, and reactive power sources connected to the reactive power and voltage control system for the wind farm; wherein the reactive power and voltage control system for the wind farm is configured to: acquire electrical measurement values ​​at the wind farm's grid connection point, reference values ​​of control commands issued by the grid to the wind farm, and reactive power capacity limits for each reactive power source currently in normal operation in the wind farm; acquire a reactive power target value at the wind farm's grid connection point based on at least one of the electrical measurement values ​​and the control command reference values; and acquire the reactive power target value for each reactive power source currently in normal operation in the wind farm. The original sum of the reactive power capacity limits of reactive power sources; the original sum is subjected to delay filtering to obtain a delayed sum; based on the reactive power target value, the electrical measurement value, and the delayed sum, the reactive power command target value of the wind farm is determined; based on the reactive power command target value, the delayed sum, and the reactive power capacity limit of each reactive power source, the reactive power command value corresponding to each reactive power source is determined; each reactive power source is controlled to output reactive power according to the reactive power command value corresponding to each reactive power source; wherein, the delay filtering is used to control the original sum to change with delay within a preset time period.

[0030] Optionally, the reactive power source includes a fan and a centralized reactive power compensation device, wherein the fan is a doubly fed fan and / or a direct-drive fan.

[0031] According to a fourth aspect of the present disclosure, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement a reactive voltage control method for a wind farm according to the present disclosure.

[0032] According to a fifth aspect of the present disclosure, a computer-readable storage medium is provided that, when instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform a reactive voltage control method for a wind farm according to the present disclosure.

[0033] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0034] The original sum of the reactive power capacity limits for each reactive power source can be delayed and filtered, and the reactive power command value corresponding to each reactive power source can be determined based on the obtained delayed sum. That is, in the process of calculating the reactive power capacity of the reactive power source group, this disclosure does not directly use the real-time reactive power capacity of the reactive power source group, but instead performs delayed filtering on the real-time reactive power capacity of the reactive power source group. This avoids abrupt changes in the actual reactive power capacity of the reactive power source group, and thus avoids abrupt changes in the reactive power allocation command. In this way, by adopting a flexible reactive power control method, this disclosure can ensure a smooth transition in overall reactive power control, reduce the probability of abnormal fluctuations in reactive power allocation commands due to changes in the operating conditions of the reactive power source group, improve the reliability of reactive power control and the stability of system operation, and optimize the overall reactive power control effect.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0037] Figure 1 This is a schematic diagram illustrating a new energy power station according to an exemplary embodiment of the present disclosure;

[0038] Figure 2 This is a flowchart illustrating a reactive voltage control method for a wind farm according to an exemplary embodiment of the present disclosure;

[0039] Figure 3 This is a schematic diagram illustrating the configuration of a reactive voltage control system (AVC) according to an exemplary embodiment of the present disclosure;

[0040] Figure 4 This illustrates an exemplary embodiment of determining the reactive power command target value Q of a wind farm according to the present disclosure. output A schematic diagram of the process;

[0041] Figure 5 This is a schematic diagram illustrating a delayed filtering of the original sum value according to an exemplary embodiment of the present disclosure;

[0042] Figure 6 This is a schematic diagram illustrating a reactive power instruction allocation process according to an exemplary embodiment of the present disclosure;

[0043] Figure 7 This is a schematic diagram illustrating flexible control of the reactive power of a wind farm including a static var generator (SVG) and a wind turbine, according to an exemplary embodiment of the present disclosure.

[0044] Figure 8 This is a flowchart illustrating a specific implementation of a reactive voltage control method for a wind farm according to an exemplary embodiment of the present disclosure;

[0045] Figure 9 This is a block diagram illustrating a reactive voltage control system for a wind farm according to an exemplary embodiment of the present disclosure;

[0046] Figure 10 This is a block diagram illustrating an electronic device according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following examples do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0049] It should be noted that the phrase "at least one of several items" in this disclosure refers to three parallel cases: "any one of the several items", "a combination of any number of the several items", and "all of the several items". For example, "including at least one of A and B" includes the following three parallel cases: (1) including A; (2) including B; (3) including A and B. As another example, "performing at least one of step one and step two" indicates the following three parallel cases: (1) performing step one; (2) performing step two; (3) performing both step one and step two.

[0050] Currently, reactive power allocation to wind turbines is often based on the overall reactive power capacity of the wind farm. However, during actual operation, due to their decentralized distribution and relatively small capacity, wind turbines often experience partial grid connection, mass shutdowns, or communication interruptions. In these situations, the actual reactive power capacity of the wind turbine cluster can change abruptly. Consequently, the reactive power allocation commands for the controlled turbines can also change drastically within a short period, potentially causing abnormal fluctuations in overall reactive power control. In severe cases, this could even lead to turbine failures, shutdowns, and equipment damage. Therefore, the stability and reliability of reactive power control for wind turbines in related technologies are relatively poor.

[0051] To address the aforementioned problems in related technologies, the reactive power voltage control method, system, electronic equipment, and storage medium for wind farms provided in this disclosure can perform delayed filtering on the original sum of reactive power capacity limits for each reactive power source, and then determine the reactive power command value corresponding to each reactive power source based on the obtained delayed sum. That is, in the process of calculating the reactive power capacity of the reactive power source group, this disclosure does not directly use the real-time reactive power capacity of the reactive power source group, but instead performs delayed filtering on the real-time reactive power capacity of the reactive power source group. This avoids abrupt changes in the actual reactive power capacity of the reactive power source group, and thus avoids abrupt changes in the reactive power allocation command. In this way, by adopting a flexible reactive power control method, this disclosure can ensure a smooth transition in overall reactive power control, reduce the probability of abnormal fluctuations in reactive power allocation commands due to changes in the operating conditions of the reactive power source group, improve the reliability of reactive power control and the stability of system operation, and optimize the overall reactive power control effect.

[0052] Figure 1 This is a schematic diagram illustrating a renewable energy power station according to an exemplary embodiment of the present disclosure. (Refer to...) Figure 1 The automatic voltage control (AVC) system 100 of the wind farm is located in the central control link. This AVC can be a device or system for reactive voltage control in the power system. Figure 1 The diagram also shows a reactive power source 1011 connected to an AVC.

[0053] Furthermore, the new energy power station may also include other devices connected to the AVC (Automatic Generation Control) system, i.e., communicating with it. Examples may include, but are not limited to: photovoltaic inverter 101, energy storage device 102, synchronous condenser 103, voltage transformer (PT) 104, current transformer (CT) 105, host computer workstation 106, remote control device 107, vertical encryption device 108, power grid company reactive power and voltage control system (AVC) 109, power grid company automatic generation control system (AGC) 1010, and switching reactive power compensation device 1012.

[0054] The reactive power and voltage control system 100 of the wind farm is used to: acquire electrical measurement values ​​at the wind farm's grid connection point, reference values ​​of control commands issued by the power grid to the wind farm, and the reactive power capacity limit of each reactive power source 1011 currently in normal operation in the wind farm; acquire the reactive power target value at the wind farm's grid connection point based on at least one of the electrical measurement values ​​and the control command reference values; acquire the original sum of the reactive power capacity limits of each reactive power source 1011; perform delay filtering on the original sum to obtain a delayed sum; determine the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement values, and the delayed sum; determine the reactive power command value corresponding to each reactive power source 1011 based on the reactive power command target value, the delayed sum, and the reactive power capacity limit of each reactive power source 1011; and control each reactive power source 1011 to output reactive power according to the reactive power command value corresponding to each reactive power source 1011; wherein, the delay filtering is used to control the original sum to change slowly within a preset time period.

[0055] According to an exemplary embodiment of this disclosure, the aforementioned reactive power source 1011 may include a wind turbine 10111 and a centralized reactive power compensation device 10112. The wind turbine 10111 may be a doubly-fed wind turbine 101111 and / or a direct-drive wind turbine 101112. Further, the centralized reactive power compensation device 10112 may include at least one of a static var generator (SVG) 101121 and a static var compensator (SVC) 101122.

[0056] Furthermore, the reactive power and voltage control system 100 of the wind farm can be connected to the host computer workstation 106 and the remote control device 107 via Modbus TCP protocol to realize input and output; the reactive power and voltage control system 100 of the wind farm can be connected to the dispatch network via the vertical encryption device 108 via protocols such as IEC104 and DNP 3.0, and then connected to the power grid company's AVC system 109 or the power grid company's AGC system 1010.

[0057] The reactive power and voltage control system 100 of the wind farm can be networked with the photovoltaic inverter 101 using protocols such as Modbus TCP, IEC 104, and DNP 3.0; and can be networked with the energy storage device 102, synchronous condenser 103, centralized reactive power compensation device 10112, and switching reactive power compensation device 1012 using protocols such as Modbus TCP, IEC 104, and IEC 61850; and can also be networked with the wind turbine 10111 using protocols such as Modbus TCP, IEC 104, OPCUA, and DNP 3.0. It should be noted that the network connection protocols are not limited to the above-mentioned protocols and can also be other protocols; the aforementioned implementation is merely an example.

[0058] Figure 2 This is a flowchart illustrating a reactive voltage control method for a wind farm according to an exemplary embodiment of the present disclosure.

[0059] Reference Figure 2 In step 201, the electrical measurement values ​​of the wind farm grid connection point, the reference values ​​of the control commands issued by the power grid to the wind farm, and the reactive power limit values ​​of each reactive power source currently in normal operation in the wind farm can be obtained.

[0060] Here, the "wind farm grid connection point" is the connection point between the external power grid and the reactive power source group. The reactive power source group is used to generate electricity and transmit the generated electricity to various electrical devices through the external power grid. The "wind farm grid connection point" can also be called the "control point".

[0061] According to exemplary embodiments of this disclosure, the aforementioned reactive power source may include a wind turbine and a centralized reactive power compensation device, and the centralized reactive power compensation device may include at least one of a static var compensator (SVC) and a static var generator (SVG). The reactive power voltage control method of this disclosure will now be described using an example where the reactive power source consists only of a wind turbine.

[0062] "Electrical measurement values ​​at the wind farm grid connection point" can include the reactive power measurement value Q at the wind farm grid connection point. meas Voltage measurement value V at the grid connection point of the wind farm meas Active power measurement value P at the wind farm grid connection point meas "Control command reference values ​​for wind farms issued by the power grid" may include voltage command reference values ​​V. ref Reactive power command reference value Q ref Power factor command reference value Pf ref .

[0063] The limit of non-functional capacity for each wind turbine can be Q. WT_i That is, the limit of nonfunctional capacity of the i-th unit can be Q. WT_iFurthermore, according to the main unit's reactive power command Q... output Different levels of sensitivity, Q WT_i The value of Q also varies. output When Q is positive (in the case of a capacitive instruction), WT_i The value is the capacitive non-functional limit of the unit; when Q output When Q is negative (in the case of an inductive instruction), WT_i The value is the limit of the unit's inductive non-functional capacity.

[0064] It should be noted that each unit, i.e., each wind turbine, reports its own non-functional capacity limit Q. WT_i Simultaneously, the unit can also report its own status flag, which indicates whether the corresponding wind turbine is in normal operating condition. Alternatively, the unit may not directly upload its own status flag, but instead report some parameters related to its own operating status to the reactive power control system (AVC). The AVC then determines whether the unit is in normal operating condition based on the relevant parameters reported by the unit. This disclosure does not impose specific restrictions on the method of determining whether a unit is in normal operating condition.

[0065] Furthermore, the reactive voltage control system AVC provided in this disclosure may include multiple functional modules, namely, "data acquisition module", "data forwarding and interaction module", "sensitivity analysis module", "automatic voltage regulation and control module", "front-end human-machine interaction control platform", "data management platform", "integrated alarm module" and "operation analysis and evaluation module". Figure 3 This is a schematic diagram illustrating the configuration of a reactive voltage control system (AVC) according to an exemplary embodiment of the present disclosure.

[0066] Here, the "data acquisition module" mainly collects information on electrical analog quantities at the wind farm's grid connection point, including but not limited to: phase voltage, phase current, line voltage, system frequency, active power, reactive power, apparent power, system frequency change rate, etc. It can be implemented as a standalone measurement and monitoring device or as a functional module within an integrated system. The former can communicate via the power grid or serial port, while the latter can communicate via an internal bus or other means.

[0067] The "Data Forwarding and Interaction Module" mainly realizes the communication between the reactive voltage control system (AVC) and upstream and downstream equipment. The data information can include telemetry, teleindication, etc. The communication protocol can include, but is not limited to: serial communication protocol (Modbus), IEC60870-5-101 / 104, time-sensitive networking technology based on OPC Unified Architecture (OPC UA), etc.

[0068] The "front-end human-machine interaction control platform" is mainly a front-end server, which can be a personal computer (PC) or other forms of equipment with a human-machine interface. Its main function is to provide staff with methods and means to monitor, view, operate, control, draw views, draw real-time curves, and generate reports on the reactive voltage control system (AVC).

[0069] The "data management platform" is mainly a historical database, which can save parameter settings, lockout settings, and adjustment processes.

[0070] The "Comprehensive Alarm Module" primarily provides fault diagnosis functions for the device itself, including but not limited to: communication anomalies, program crashes, protection triggers, etc. When an anomaly occurs, the device can sound an alarm, stop operation, and automatically adjust; when the anomaly disappears, the program can return to normal.

[0071] The "Operation Analysis and Evaluation Module" can perform online assessments of equipment operation, online analysis and calculations of control effectiveness, and evaluations of the overall system's control effectiveness. For example, it can assess, analyze, and evaluate optimization control time, control cycle, strategy generation time, and control pass rate.

[0072] The "Automatic Voltage Regulation and Control Module" is the core module of the reactive power voltage control system (AVC). It mainly completes the overall strategy calculation and reactive power command generation, that is, it mainly optimizes the reactive power command allocation process.

[0073] According to exemplary embodiments of this disclosure, this disclosure is mainly applied to scenarios where reactive power sources are shut down in batches or communication is interrupted in batches. That is, when multiple reactive power sources included in a reactive power source group of a wind farm are shut down in batches or communication is interrupted in batches, the reactive power capacity limit of each reactive power source currently in normal operation included in the reactive power source group can be obtained.

[0074] In step 202, the reactive power target value Q at the wind farm grid connection point can be obtained based on at least one of the electrical measurement value and the control command reference value. target .

[0075] Figure 4 This illustrates an exemplary embodiment of determining the reactive power command target value Q of a wind farm according to the present disclosure. output A schematic diagram of the process. (Refer to...) Figure 4 ,1 / (1+ST Q ), 1 / (1+ST V ), 1 / (1+ST P ) are all filters, where T Q The reactive power measurement value is the inertial time constant, T. VThe voltage measurement inertial time constant, T P Let S be the inertial time constant of the active measurement value, and S be the Laplace operator.

[0076] V error For voltage difference, K droop To preset the voltage droop factor, Q error The reactive power change value, Q target The target reactive power value at the wind farm's grid connection point, Q max,pos This is a preset upper limit value for reactive power commands, i.e., the capacitive reactive power capacity limit, and by default, capacitive reactive power is a positive value, Q. min,neg This is the preset lower limit value for reactive power command, i.e., the limit value for inductive reactive power, and the default value for inductive reactive power is negative.

[0077] K p +K i / S stands for Proportional-Integral Controller (PI controller), which consists of two parts: a proportional control section and an integral control section. The proportional control section adjusts the output proportionally to the magnitude of the deviation; the integral control section adjusts the output by integrating the deviation until the steady-state error is eliminated. The expression for a PI controller can be:

[0078] K p ×e(t)+K i ×∫e(t)dt(1)

[0079] K p K is the proportional coefficient for PI control. i Here, e(t) is the integral coefficient for PI control, and e(t) is the control variable.

[0080] Q max This is the upper limit of the PI control output command, i.e., the capacitive reactive power limit, and the capacitive reactive power is positive by default. Furthermore, Q... max The delayed capacitance and its value are obtained by delay filtering the sum of the capacitive free energy limits of each wind turbine under normal operating conditions; Q min This is the lower limit of the PI control output command, i.e., the limit of inductive reactive power, and by default, inductive reactive power is negative. Furthermore, Q... min The delayed inductance and value are obtained by delay filtering the sum of the inductance non-functional capacity limits of each wind turbine in normal operation.

[0081] Q output This represents the target value for reactive power commands in the wind farm.

[0082] It should be noted that the reactive power target value Q at the wind farm grid connection point is calculated as follows: targetThere are three modes available: "voltage mode," "reactive power mode," and "power factor mode." Figure 4 In this context, "V" represents "voltage mode," "Q" represents "reactive power mode," and "Pf" represents "power factor mode." Below, we will explain the target reactive power value Q at the wind farm's grid connection point under each of these three modes. target The calculation process.

[0083] According to an exemplary embodiment of this disclosure, electrical measurements may include the reactive power measurement value Q at the wind farm's grid connection point. meas Voltage measurement value V at the grid connection point of the wind farm meas The control command reference value can include the voltage command reference value V. ref .

[0084] First, the voltage measurement value V can be... meas Delay filtering is performed to obtain the voltage filter value. For example, a filter 1 / (1+ST) can be used. V For voltage measurement value V meas Perform delay filtering. As mentioned earlier, T V Let S be the inertial time constant of the voltage measurement value, and S be the Laplace operator.

[0085] Then, the voltage command reference value V can be obtained. ref Voltage difference V between the voltage filter value and the voltage value error Next, the voltage difference V can be obtained. error With the preset voltage droop coefficient K droop The product of these two factors is used as the reactive power change value Q. error Then, the reactive power measurement value Q can be... meas Delay filtering is performed to obtain the reactive power filtered value. For example, a filter 1 / (1+ST) can be used. Q For reactive power measurement value Q meas Perform delay filtering. As mentioned earlier, T Q Let S be the inertial time constant of the reactive power measurement value, and S be the Laplace operator. Next, the reactive power change value Q can be obtained. error The sum of the reactive power filtering values ​​is used as the reactive power target value Q. target .

[0086] According to an exemplary embodiment of this disclosure, the reactive power command reference value Q included in the control command reference value can be obtained. ref As the reactive power target value Q target .

[0087] According to an exemplary embodiment of this disclosure, electrical measurements may include the active power measurement P at the wind farm's grid connection point. meas The control command reference value may include the power factor command reference value Pf.ref .

[0088] First, the power factor command reference value Pf can be obtained. ref The arccosine value cos -1 (Pf ref And the arccosine value cos -1 (Pf ref The tangent of tan(cos) -1 (Pf ref Then, the active power measurement value P can be... meas Delay filtering is performed to obtain the active power filtered value. For example, a filter 1 / 91+ST can be used. P For the active power measurement value P meas Perform delay filtering. As mentioned earlier, T P Let S be the inertial time constant of the active power measurement value, and S be the Laplace operator. Next, the active power filter value and the tangent value tan(cosθ) can be obtained. -1 (Pf ref The product of )) is used as the reactive power target value Q. target .

[0089] In step 203, the original sum of the reactive power limit values ​​for each reactive power source can be obtained. As mentioned earlier, the reactive power limit value for each wind turbine can be Q. WT_i That is, the limit of nonfunctional capacity of the i-th unit can be Q. WT_i Furthermore, according to the main unit's reactive power command Q... output Different levels of sensitivity, Q WT_i The value of Q also varies. output When Q is positive (in the case of a capacitive instruction), WT_i The value is the capacitive non-functional limit value Q of the unit. max_i When Q output When Q is negative (in the case of an inductive instruction), WT_i The value is the inductive non-functional limit Q of the unit. min_i ,Right now:

[0090]

[0091] The original sum of the unloaded capacity limits for each wind turbine is then:

[0092]

[0093] in, For the original capacities and values, For original sense and value.

[0094] In step 204, the original sum can be delayed by filtering to obtain a delayed sum. For example, the original capacitive sum obtained by summing the capacitive non-functional capacity limit of each wind turbine can be delayed by filtering to obtain the delayed capacitive sum and value Q. max Furthermore, the original inductance and value obtained by summing the inductance non-functional capacity limits of each wind turbine can be delayed and filtered to obtain the delayed inductance and value Q. min Delay filtering is mainly used to control the original sum value to change slowly over a preset time period.

[0095] Figure 5 This is a schematic diagram illustrating a delayed filtering of the original sum value according to an exemplary embodiment of the present disclosure. (Refer to...) Figure 5 "WindFarm_WFT1.Q_Max_Capacity" is the original capacitive sum and value obtained by summing the capacitive non-functional capacity limit of each wind turbine currently in normal operation. This can be achieved using a filter 1 / 91+ST. s The original capacitive and value are then subjected to delay filtering to obtain the delayed capacitive and value Q. max "WindFarm_WFT1.Q_Min_Capacity" is the original inductance and value obtained by summing the inductance non-functional capacity limits of each wind turbine currently in normal operation. A filter 1 / (1+ST) can be used. s The original inductance and value are then subjected to a delay filter to obtain the delayed inductance and value Q. min .

[0096] According to an exemplary embodiment of this disclosure, the inertial time constant T corresponding to the above-mentioned delay filtering s The value range can be 0 seconds. <T s <60 seconds. A reasonable choice of T. s The value of T can avoid abnormal fluctuations in reactive power control caused by shutdowns and communication interruptions. For example, T s The time constant is typically set to 10 seconds.

[0097] It should be noted that, Figure 5 The filtering method shown is a first-order inertial low-pass filter. Other filtering methods can also be used for delay filtering of the non-functional device. Figure 5 The filtering method shown is merely an example.

[0098] In this way, instead of directly using the real-time reactive power of the wind turbine cluster during the reactive power capacity calculation process, a delay filter is applied to the real-time reactive power capacity of the cluster. This allows the changes in the reactive power capacity of the cluster to be spread out over a period of time. In other words, it enables the reactive power capacity of the cluster to change slowly over a certain period of time, avoiding abrupt changes in the reactive power capacity of the cluster. Consequently, it avoids abrupt changes in reactive power distribution commands, resulting in a smooth transition of overall reactive power control. This reduces the probability of abnormal fluctuations in reactive power distribution commands due to changes in the operating conditions of the wind turbine cluster, which is beneficial to improving the reliability of reactive power control and the stability of system operation, and optimizing the overall reactive power control effect.

[0099] In step 205, the reactive power target value Q can be used as a basis. target Electrical measurements, delays, and value Q max Q min Determine the target value Q of the reactive power command for the wind farm. output .

[0100] According to an exemplary embodiment of this disclosure, the electrical measurement value may include at least the reactive power measurement value Q at the wind farm grid connection point. meas .

[0101] First, the preset reactive power command upper limit value Q can be used. max,pos And the preset reactive power command lower limit value Q min,neg For the reactive target value Q target A first limiting process is performed to obtain a first limiting value. Then, the reactive power difference between the first limiting value and the reactive power filtering value can be obtained, where the reactive power filtering value can be the reactive power measurement value Q. meas The filtered value obtained by performing delay filtering. For example, a filter 1 / (1+ST) can be used. Q For reactive power measurement value Q meas Delay filtering is performed. Next, PI control can be executed based on the reactive power difference. Then, the output value of the PI control can be subjected to a second limiting process using the delay sum to obtain the reactive power command target value Q. output That is, delay tolerance and the value Q can be utilized. max And delay sensitivity and value Q min The output value of the PI control is subjected to a second limiting process to obtain the reactive power command target value Q. output .

[0102] In this way, steady-state error can be eliminated by implementing PI control; and the target value Q of the reactive power command can be guaranteed by amplitude limiting. output Within a normal numerical range, avoid the reactive power command target value Q. output Abnormal situations where the value is too large or too small.

[0103] According to exemplary embodiments of this disclosure, as previously described, the aforementioned original sum value may include original capacitive sum and value. And primal sensibility and value Original Capacity and Value The capacitive reactive power limit Q can be set for each reactive power source. max_i The sum of values, primal senses and values The inductive reactive power limit Q can be defined for each reactive power source. min_i The sum of .

[0104] At the reactive power target value Q target Greater than or equal to the preset upper limit value of reactive power command Q max,pos In the case of Q target ≥Q max,pos In this case, the preset reactive power command upper limit value Q can be set. max,pos The first limiting value is determined; at the reactive power target value Q target Less than or equal to the preset reactive power command lower limit value Q min,neg In the case of Q target ≤Q min,neg In this case, the preset reactive power command lower limit value Q can be set. min,neg The first limiting value is determined; at the reactive power target value Q target Less than the preset upper limit value of reactive power command Q max,pos And greater than the preset reactive power command lower limit value Q min,neg In this case, the reactive power target value Q can be... target This is determined as the first amplitude limit.

[0105] It can be seen that, at the reactive target value Q target Falling to the preset reactive power command lower limit value Q min,neg and the preset reactive power command upper limit value Q max,pos When the range is defined, the reactive power target value Q can be directly expressed. target The first limiting value is determined; at the reactive power target value Q target Falling to the preset reactive power command lower limit value Q min,neg and the preset reactive power command upper limit value Q max,pos When the value is outside the defined interval, the endpoints of that interval can be defined as the first limiting value. This ensures that the first limiting value is within a normal range, avoiding abnormal situations where the first limiting value is too large or too small.

[0106] In step 206, the reactive power command target value Q can be used as a basis. output Delay and value Q max Q min And the reactive power limit Q of each reactive power source WT_i Determine the reactive power command value Q corresponding to each reactive power source. set_i Qset_i It can be the reactive power command value of the i-th generator unit.

[0107] According to an exemplary embodiment of this disclosure, the reactive power command target value Q can be calculated. output With delay and value Q max Q min The reactive power distribution ratio Q cmdf Reactive power distribution ratio Q cmdf This can be expressed by the following formula:

[0108]

[0109] Q total The reactive power limit of the wind farm is determined by the reactive power command target value Q of the wind farm. output The difference in tolerance, Q total The value of Q also varies. output When Q is a positive value, i.e., when the reactive power instruction is a capacitive instruction, Q total The latency tolerance and value Q of the cluster can be determined. max When the reactive power command target value Q output When Q is negative, i.e., when the reactive power instruction is an inductive instruction, Q total This can be the delay inductance and value of the cluster, i.e., the reactive power distribution ratio Q. cmdf The value is always positive. Specifically:

[0110]

[0111] Next, the reactive power distribution ratio Q can be determined. cmdf With the reactive power limit Q of each reactive source WT_i The product of these values ​​serves as the reactive power command value Q for each reactive power source. set_i ,Right now:

[0112] Q set_i =Q WT_i ×Q cmdf (i = 1, 2, ..., N)(6)

[0113]

[0114] Figure 6 This is a schematic diagram illustrating a reactive power command allocation process according to an exemplary embodiment of the present disclosure. In the above formulas, N is the number of controlled units in the wind turbine group, i.e., the total number of wind turbines currently in normal operation.

[0115] It should be noted that in the case of a batch shutdown of wind turbines, since the units will change from a controlled state to an uncontrolled state, the non-functional capacity limit of the currently shut-down wind turbines will not be taken into account when calculating the non-functional capacity limit of the computer group.

[0116] For example, assuming there are 10 wind turbines currently in normal operation, the reactive power limit of the turbine group is the sum of the reactive power limits of each of the 10 turbines. If a batch shutdown of the wind turbine group occurs at this time, for example, assuming 6 of the 10 turbines shut down, the reactive power limit of the turbine group then becomes only the sum of the reactive power limits of the remaining 4 turbines in normal operation. Since the state change time of the turbines during a batch shutdown is relatively short, generally several hundred milliseconds, if the real-time reactive power of the turbine group is not delayed and filtered, the real-time reactive power of the turbine group will decrease rapidly in a short time, that is, the value of the denominator of formula (4) will decrease rapidly in a short time.

[0117] Furthermore, since the reactive power command target value Q is obtained... output PI control was performed previously, therefore the reactive power command target value Q is... output The change is slow, and in some cases the reactive power instruction target value Q output The change is very small, and can even be considered to be basically unchanged. At this time, since the value of the denominator in formula (4) decreases sharply and the value of the numerator in formula (4) remains basically unchanged, the reactive power distribution ratio Q cmdf This will increase dramatically. At this point, the reactive power command value corresponding to each unit, that is, the reactive power output of each wind turbine, will increase rapidly in a short period of time. Considering a more extreme case, when the total reactive power command value Q of the entire turbine group... output When the reactive power allocation ratio Q is greater than the current reactive power capacity of the cluster, cmdf The reactive power output of each generator unit will change rapidly to the reactive power limit of that unit, which will cause abnormal fluctuations in the overall reactive power control.

[0118] Furthermore, if the unit experiences a batch communication interruption and then immediately resumes communication after the interruption, it will also cause abnormal fluctuations in the unit's reactive power control.

[0119] For example, suppose there are 10 wind turbines currently operating normally. If a mass communication interruption occurs, for example, if 9 out of 10 wind turbines experience a communication interruption, then the reactive power limit of the turbine group becomes only the reactive power limit of the remaining single wind turbine operating normally. That is, the reactive power output pressure of the 9 wind turbines with communication interruptions will be transferred to the single remaining wind turbine operating normally. At this time, if no delay filtering is applied to the real-time reactive power of the turbine group, the reactive power output of the single remaining wind turbine operating normally will increase rapidly in a short period of time. Furthermore, if the above 9 wind turbines quickly resume communication after the communication interruption, the denominator in formula (4) will suddenly increase, while the numerator in formula (4) will remain basically unchanged. If no delay filtering is applied to the real-time reactive power of the turbine group, the reactive power distribution ratio Q will increase rapidly. cmdf The reactive power output of the single remaining wind turbine operating normally will decrease rapidly within a short period. This demonstrates that if communication between multiple units is interrupted and then immediately restored, it can also lead to abnormal fluctuations in the reactive power control of the units.

[0120] Therefore, to address the potential for abnormal fluctuations in overall reactive power control during situations such as mass shutdowns of wind turbine clusters or communication interruptions between turbines, this disclosure does not directly use the real-time reactive power of the wind turbine cluster during the reactive power capacity calculation process. Instead, it performs delayed filtering on the real-time reactive power of the wind turbine cluster, enabling the control of the real-time reactive power of the wind turbine cluster to change gradually. This avoids abrupt changes in the actual reactive power of the wind turbine cluster, thereby controlling the reactive power distribution ratio Q. cmdf Gradual changes can ultimately prevent abrupt changes in reactive power allocation commands. Thus, by employing a flexible reactive power control method, this disclosure enables a smooth transition in overall reactive power control, reducing the likelihood of abnormal fluctuations in reactive power allocation commands due to changes in the operating conditions of the wind turbine group. This improves the reliability of reactive power control and the stability of system operation, optimizing the overall reactive power control effect.

[0121] According to exemplary embodiments of this disclosure, as previously described, the delay and value may include delay tolerance and the value Q. max And delay sensitivity and value Q min Delay tolerance and value Q max It can be the primitive tolerance and value contained in the primitive sum and value. The delay inductance and value Q obtained by performing delay filtering. min It can be the primitive sense and value contained in the primitive sum and value. Obtained by performing delay filtering.

[0122] At the reactive power command target value Qoutput In the case of a capacitive type, i.e., in Q output When the value is greater than 0, the reactive power command target value Q can be calculated. output With delay tolerance and value Q max The ratio of Q to the reactive power distribution ratio is used as the reactive power distribution ratio. cmdf At this time:

[0123]

[0124] At the reactive power command target value Q output In the case of the emotional type, that is, in Q output When the value is less than 0, the reactive power command target value Q can be calculated. output With delay sensitivity and value Q min The ratio of Q to the reactive power distribution ratio is used as the reactive power distribution ratio. cmdf At this time:

[0125]

[0126] According to an exemplary embodiment of this disclosure, in the reactive power command target value Q output In the case of a capacitive type, i.e., in Q output When the reactive power distribution ratio Q is greater than 0, the reactive power distribution ratio Q can be determined. cmdf With respect to the capacitive reactive power limit Q of each reactive power source max_ The product of these values ​​serves as the reactive power command value Q for each reactive power source. set_i At this time:

[0127] Q set_i =Q max_ ×Q cmdf i = 1, 2, ... N)(9)

[0128] At the reactive power command target value Q output In the case of the emotional type, that is, in Q output When the value is less than 0, the reactive power distribution ratio Q can be determined. cmdf With respect to the inductive reactive power limit Q of each reactive source min_ The product of these values ​​serves as the reactive power command value Q for each reactive power source. set_i At this time:

[0129] Q set_i =Q min_ ×Q cmdf i = 1, 2, ... N)(10)

[0130] In step 207, each reactive power source can be controlled to output reactive power according to the reactive power command value corresponding to each reactive power source. For example, each wind turbine can be controlled to output reactive power according to the reactive power command value corresponding to each wind turbine.

[0131] It should be noted that the above description is for wind turbine groups. In actual control processes, there are often other continuous controlled reactive power sources, including Static Var Compensators (SVCs), Static Var Generators (SVGs), Synchronous Condensers, etc.

[0132] A static var generator (SVG) consists of a voltage source converter connected in parallel to the system. Its output capacitive or inductive reactive current is continuously adjustable and independent of the system voltage within the operating system voltage range.

[0133] A static var compensator (SVC) consists of a reactor and a capacitor controlled by thyristors. Thyristors respond extremely quickly to control signals and can be switched on and off without limitation. The reactive power output is related to the voltage.

[0134] This disclosure applies not only to wind farms that contain only wind turbine generators, but also to wind farms equipped with other reactive power sources and wind turbine generators.

[0135] Figure 7 This is a schematic diagram illustrating flexible control of the reactive power of a wind farm including a static var generator (SVG) and a wind turbine, according to an exemplary embodiment of this disclosure. (Refer to...) Figure 7 "WindFarm_WTT1.Q_Max_Capacity" is the original capacitive sum and value obtained by summing the capacitive reactive power limit of each wind turbine currently in normal operation; "WindFarm_WTT1.Q_Min_Capacity" is the original inductive sum and value obtained by summing the inductive reactive power limit of each wind turbine currently in normal operation; "WindFarm_WTT1.Q_Max_A" is the currently available capacitive reactive power of the turbine cluster; "WindFarm_WTT1.Q_Min_A" is the currently available inductive reactive power of the turbine cluster.

[0136] "WindFarm_SVGT1.Q_Max_Capacity" is the original capacitive and minimum capacitive limits obtained by summing the capacitive non-functional limits of each SVG currently in normal operation; "WindFarm_SVGT1.Q_Min_Capacity" is the original inductive and minimum capacitive limits obtained by summing the inductive non-functional limits of each SVG currently in normal operation; "WindFarm_SVGT1.Q_Max_A" is the currently available capacitive non-functional capacity of the SVG group; "WindFarm_SVGT1.Q_Min_A" is the currently available inductive non-functional capacity of the SVG group.

[0137] "WindFarm_WFT1.Q_Max_Capacity" is the original capacitive sum and value obtained by summing the capacitive non-functional capacity limits of each wind turbine and each SVG currently in normal operation; "WindFarm_WFT1.Q_Min_Capacity" is the original inductive sum and value obtained by summing the inductive non-functional capacity limits of each wind turbine and each SVG currently in normal operation; "WindFarm_WFT1.Q_Max_A" is the currently available capacitive non-functional capacity of the turbine group and SVG group; "WindFarm_WFT1.Q_Min_A" is the currently available inductive non-functional capacity of the turbine group and SVG group.

[0138] Using filter 1 / (1+ST) s By applying delay filtering to "WindFarm_WFT1.Q_Max_Capacity", the delay tolerance and value Q of the cluster and SVG cluster can be obtained. max Using filter 1 / 1+ST s By applying delay filtering to "WindFarm_WFT1.Q_Min_Capacity", the delay inductance and value Q of the cluster and SVG cluster can be obtained. min .

[0139] Figure 8 This is a flowchart illustrating a specific implementation of a reactive power voltage control method for a wind farm according to an exemplary embodiment of the present disclosure. In this embodiment, the reactive power source is a wind turbine as an example for explanation.

[0140] Reference Figure 8 In step 801, the reactive power control system AVC can acquire the reactive power measurement value Q at the wind farm grid connection point. meas Voltage measurement value V meas Active power measurement value P meas The reference value V of the voltage command issued by the power grid ref Reactive power command reference value Q ref Power factor command reference value Pf ref And the limit of non-functional capacity Q for each wind turbine currently in normal operation in the wind farm. WT_i .

[0141] In step 802, the reactive power control system AVC can obtain the reactive power target value Q at the wind farm grid connection point based on at least one of the electrical measurement value and the control command reference value. target .

[0142] As described in the previous embodiment, return to reference Figure 4"V" represents "voltage mode", "Q" represents "reactive power mode", and "Pf" represents "power factor mode". You can choose any one of these three modes to calculate the target reactive power value Q at the wind farm's grid connection point. target .

[0143] For example, if "voltage mode" is selected, the reactive power measurement value Q at the wind farm's grid connection point can be used as a basis. meas Voltage measurement value V at the grid connection point of the wind farm meas and voltage command reference value V ref To calculate the target reactive power value Q at the wind farm's grid connection point target If "Reactive Power Mode" is selected, it can be based on the reactive power command reference value Q. ref To calculate the target reactive power value Q at the wind farm's grid connection point target If the "Power Factor Mode" is selected, the active power measurement value P at the wind farm's grid connection point can be used as the basis. meas and the power factor command reference value Pf ref To calculate the target reactive power value Q at the wind farm's grid connection point target Calculate the reactive power target value Q under various modes. target The specific process has been described in detail in the previous embodiment and will not be repeated here.

[0144] In step 803, the reactive power voltage control system AVC sets the reactive power target value Q at the wind farm grid connection point. target Perform the first limiting process to obtain the first limiting value.

[0145] Furthermore, a preset upper limit value Q for reactive power commands can be utilized. max,pos And the preset reactive power command lower limit value Q min,neg For the reactive target value Q target The first clipping step is performed. The specific clipping process has been described in detail in the previous embodiment and will not be repeated here.

[0146] In step 804, the reactive power control system AVC can obtain the reactive power difference between the first limiting value and the reactive power filter value. This reactive power filter value can be the reactive power measurement value Q. meas The filtered value obtained by performing delay filtering. As mentioned earlier, for example, the filter 1 / (1+ST) can be used. Q For reactive power measurement value Q meas Perform delay filtering.

[0147] In step 805, the reactive power voltage control system AVC performs PI control based on the aforementioned reactive power difference. As mentioned earlier, the PI controller consists of two parts: a proportional control section and an integral control section. The proportional control section adjusts the output proportionally according to the magnitude of the deviation; the integral control section adjusts the output by integrating the deviation until the steady-state error is eliminated.

[0148] In step 806, the reactive voltage control system AVC adopts a flexible reactive power strategy computer group's flexible reactive power.

[0149] As mentioned earlier, we can first calculate the original sum of the unused capacity limits for each wind turbine currently in normal operation. Then, the filter 1 / 1+ST can be used. s The original sum is delayed by filtering to obtain the delayed sum Q. max Q min This means obtaining the flexible non-functional capabilities of the fleet.

[0150] In step 807, the reactive power control system AVC performs a second limiting process on the output value of the PI control based on the flexible reactive power capacity of the machine group to obtain the reactive power command target value Q. output .

[0151] As mentioned earlier, the reactive voltage control system (AVC) can be based on delay capacitance and the value Q. max Delayed sensitivity and value Q min The output value of the PI control is subjected to a second limiting process to obtain the reactive power command target value Q. output .

[0152] In step 808, the reactive power control system AVC is based on the reactive power command target value Q. output And the flexible reactive power calculation of the fleet, the reactive power allocation ratio Q cmdf ,Right now:

[0153]

[0154] Among them, Q total For the flexible non-functional force of the machine group.

[0155] In step 809, the reactive power control system AVC is based on the reactive power allocation ratio Q. cmdf And the limit of non-functional capacity Q for each wind turbine. WT_i Determine the reactive power command value Q corresponding to each wind turbine. set_i ,Right now:

[0156] Q set_i =Q WT_i ×Q cmdf i = 1, 2, ... N)(6)

[0157] In step 8010, each wind turbine is controlled to operate according to the reactive power command value Q corresponding to each wind turbine. set_i To produce unproductive output.

[0158] It is important to note that the actual reactive power capacity of the wind turbine group plays a crucial role in the overall control strategy calculation. On the one hand, it is critical in limiting the command amplitude of deviation control; on the other hand, it is extremely important in calculating the reactive power allocation ratio. In related technologies, the actual reactive power capacity of the wind turbine group is often calculated using a constant value, such as the rated reactive power capacity of the wind turbine group, or a real-time variable value, i.e., the real-time reactive power capacity of the wind turbine group. Both methods have significant drawbacks. Using a constant value means that reactive power control cannot be adaptively adjusted in real time, affecting the saturation of deviation control and thus impacting overall reactive power control. Using a real-time variable value affects the calculation of the reactive power allocation ratio in the reactive power command allocation process, leading to significant fluctuations in the overall reactive power control process.

[0159] In this disclosure, a trade-off is struck between the two methods mentioned above, namely, the deviation control limit and the calculation of the reactive power distribution ratio are taken into account, so that the overall reactive power control has higher stability and reliability under all operating conditions.

[0160] Figure 9 This is a block diagram illustrating a reactive voltage control system for a wind farm according to an exemplary embodiment of the present disclosure.

[0161] Reference Figure 9 The system 900 may include a parameter value acquisition module 901, a reactive power target value acquisition module 902, a raw sum value acquisition module 903, a delay filtering module 904, a reactive power command target value determination module 905, a reactive power command value determination module 906, and a reactive power output control module 907.

[0162] The parameter value acquisition module 901 is configured to acquire electrical measurement values ​​at the wind farm grid connection point, reference values ​​of control commands issued by the power grid to the wind farm, and the reactive power limit values ​​of each reactive power source currently in normal operation in the wind farm.

[0163] The reactive power target value acquisition module 902 is configured to acquire the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement value and the control command reference value.

[0164] The original sum value acquisition module 903 is configured to acquire the original sum value of the reactive power limit value of each reactive power source;

[0165] Delay filtering module 904 is configured to perform delay filtering on the original sum value to obtain a delayed sum value;

[0166] The reactive power command target value determination module 905 is configured to determine the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement value, and the delay sum value.

[0167] The reactive power instruction value determination module 906 is configured to determine the reactive power instruction value corresponding to each reactive power source based on the reactive power instruction target value, the delay sum value, and the reactive power capacity limit value of each reactive power source.

[0168] The reactive power output control module 907 is configured to control each reactive power source to output reactive power according to the reactive power command value corresponding to each reactive power source.

[0169] The delay filtering is used to control the original sum value to change with a delay within a preset time period.

[0170] According to an exemplary embodiment of this disclosure, the parameter value acquisition module 901 is configured to:

[0171] In the event that multiple reactive power sources in the reactive power source group of the wind farm experience a batch shutdown or a batch communication interruption, the reactive power capacity limit of each reactive power source currently in normal operation in the reactive power source group is obtained.

[0172] According to an exemplary embodiment of this disclosure, the inertial time constant corresponding to the delay filtering has a value range of 0 seconds. <T s <60 seconds, where T s Let be the inertial time constant.

[0173] According to an exemplary embodiment of this disclosure, the reactive power source includes a wind turbine and a centralized reactive power compensation device.

[0174] According to an exemplary embodiment of this disclosure, the electrical measurement value includes at least the reactive power measurement value of the wind farm grid connection point; the reactive power command target value determination module 905 is configured to: perform a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value of the reactive power command to obtain a first limiting value; obtain the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is a filter value obtained by delaying the reactive power measurement value; perform PI control based on the reactive power difference; and perform a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value.

[0175] According to an exemplary embodiment of this disclosure, the original sum value includes an original capacitive sum value and an original inductive sum value, wherein the original capacitive sum value is the sum of the capacitive reactive power capacity limits of each reactive power source, and the original inductive sum value is the sum of the inductive reactive power capacity limits of each reactive power source; the reactive power command target value determination module 905 is configured to: determine the preset reactive power command upper limit value as the first limiting value when the reactive power target value is greater than or equal to the preset reactive power command lower limit value; determine the preset reactive power command lower limit value as the first limiting value when the reactive power target value is less than or equal to the preset reactive power command lower limit value; and determine the reactive power target value as the first limiting value when the reactive power target value is less than the preset reactive power command upper limit value and greater than the preset reactive power command lower limit value.

[0176] According to an exemplary embodiment of this disclosure, the electrical measurement values ​​include the reactive power measurement value of the wind farm grid connection point and the voltage measurement value of the wind farm grid connection point, and the control command reference value includes a voltage command reference value; the reactive power target value acquisition module 902 is configured to: perform delayed filtering on the voltage measurement value to obtain a voltage filter value; acquire the voltage difference between the voltage command reference value and the voltage filter value; acquire the product of the voltage difference and a preset voltage droop coefficient as the reactive power change value; perform delayed filtering on the reactive power measurement value to obtain a reactive power filter value; and acquire the sum of the reactive power change value and the reactive power filter value as the reactive power target value.

[0177] According to an exemplary embodiment of this disclosure, the reactive power target value acquisition module 902 is configured to: acquire the reactive power instruction reference value contained in the control instruction reference value as the reactive power target value.

[0178] According to an exemplary embodiment of this disclosure, the electrical measurement value includes the active power measurement value of the wind farm grid connection point, and the control command reference value includes a power factor command reference value; the reactive power target value acquisition module 902 is configured to: acquire the inverse cosine value of the power factor command reference value and the tangent value of the inverse cosine value; perform a delay filter on the active power measurement value to obtain an active power filtered value; and acquire the product of the active power filtered value and the tangent value as the reactive power target value.

[0179] According to an exemplary embodiment of this disclosure, the reactive power command value determination module 906 is configured to: calculate the reactive power allocation ratio between the reactive power command target value and the delay sum value; and determine the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power command value corresponding to each reactive power source.

[0180] According to an exemplary embodiment of this disclosure, the delay sum includes a delay capacitive sum and a delay inductive sum, wherein the delay capacitive sum and the delay inductive sum are obtained by delay filtering the original capacitive sum and the delay inductive sum included in the original sum; the delay inductive sum and the delay inductive sum are obtained by delay filtering the original inductive sum and the delay inductive sum included in the original sum; the reactive power command value determination module 906 is configured to: when the reactive power command target value is of the capacitive type, calculate the ratio of the reactive power command target value to the delay capacitive sum and the delay inductive sum as the reactive power allocation ratio; and when the reactive power command target value is of the inductive type, calculate the ratio of the reactive power command target value to the delay inductive sum and the delay inductive sum as the reactive power allocation ratio.

[0181] According to an exemplary embodiment of this disclosure, the reactive power command value determination module 906 is configured to: when the reactive power command target value is capacitive, determine the product of the reactive power allocation ratio and the capacitive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source; and when the reactive power command target value is inductive, determine the product of the reactive power allocation ratio and the inductive reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source.

[0182] Figure 10 This is a block diagram illustrating an electronic device 1000 according to an exemplary embodiment of the present disclosure.

[0183] Reference Figure 10 The electronic device 1000 includes at least one memory 1001 and at least one processor 1002. The at least one memory 1001 stores instructions that, when executed by the at least one processor 1002, perform a reactive voltage control method for a wind farm according to an exemplary embodiment of the present disclosure.

[0184] As an example, electronic device 1000 may be a PC, tablet, personal digital assistant, smartphone, or other device capable of executing the aforementioned instructions. Here, electronic device 1000 is not necessarily a single electronic device, but may be a collection of any devices or circuits capable of executing the aforementioned instructions (or instruction sets) individually or in combination. Electronic device 1000 may also be part of an integrated control system or system manager, or may be configured to interconnect with a portable electronic device locally or remotely (e.g., via wireless transmission) through an interface.

[0185] In electronic device 1000, processor 1002 may include a central processing unit (CPU), a graphics processing unit (GPU), a programmable logic device, a dedicated processor system, a microcontroller, or a microprocessor. By way of example and not limitation, processor may also include analog processors, digital processors, microprocessors, multi-core processors, processor arrays, network processors, etc.

[0186] The processor 1002 can execute instructions or code stored in the memory 1001, which can also store data. Instructions and data can also be sent and received via a network through a network interface device, which can employ any known transmission protocol.

[0187] The memory 1001 may be integrated with the processor 1002, for example, by arranging RAM or flash memory within an integrated circuit microprocessor. Alternatively, the memory 1001 may include a separate device, such as an external disk drive, a storage array, or other storage device usable by any database system. The memory 1001 and the processor 1002 may be operatively coupled, or may communicate with each other, for example, via I / O ports, network connections, etc., enabling the processor 1002 to read files stored in the memory.

[0188] In addition, the electronic device 1000 may also include a video display (such as a liquid crystal display) and a user interaction interface (such as a keyboard, mouse, touch input device, etc.). All components of the electronic device 1000 can be interconnected via a bus and / or network.

[0189] According to exemplary embodiments of this disclosure, a computer-readable storage medium may also be provided, which, when executed by a processor of an electronic device, enables the electronic device to perform the aforementioned reactive power control method for wind farms. Examples of computer-readable storage media 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, BD-R The computer program can be stored in a computer-readable storage medium such as a BD-RE, Blu-ray or optical disc storage device, hard disk drive (HDD), solid-state drive (SSD), card storage (such as a 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 drive, or any other device configured to store a computer program and any associated data, data files, and data structures in a non-transitory manner and to 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 aforementioned computer-readable storage medium can run in an environment deployed in computer devices such as clients, hosts, agent devices, servers, etc. Furthermore, in one example, the computer program and any associated data, data files, and data structures are distributed across a networked computer system, such that the computer program and any associated data, data files, and data structures are stored, accessed, and executed in a distributed manner through one or more processors or computers.

[0190] According to the reactive power voltage control method, system, electronic equipment, and storage medium for wind farms disclosed herein, in the calculation of the reactive power capacity of the reactive power source group, the real-time reactive power capacity of the reactive power source group is not directly used. Instead, a delay filter is applied to the real-time reactive power capacity of the reactive power source group. This allows for the control of the real-time reactive power capacity of the reactive power source group to change slowly, thus avoiding abrupt changes in the actual reactive power capacity of the reactive power source group. Consequently, the reactive power distribution ratio Q can be controlled. cmdf Gradual changes can ultimately prevent abrupt changes in reactive power allocation commands. Thus, by employing a flexible reactive power control method, this disclosure enables a smooth transition in overall reactive power control, reducing the probability of abnormal fluctuations in reactive power allocation commands due to changes in the operating conditions of the reactive power source group. This improves the reliability of reactive power control and the stability of system operation, optimizing the overall reactive power control effect.

[0191] Furthermore, by implementing PI control, steady-state error can be eliminated; and by limiting the amplitude, the target value Q of the reactive power command can be guaranteed. output Within a normal numerical range, avoid the reactive power command target value Q. output Abnormal situations where the value is too large or too small.

[0192] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0193] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A reactive power and voltage control method for a wind farm, characterized in that, include: Obtain electrical measurement values ​​at the wind farm's grid connection point, reference values ​​of control commands issued by the power grid to the wind farm, and the reactive power limit values ​​of each reactive power source currently in normal operation in the wind farm; Based on at least one of the electrical measurement values ​​and the control command reference values, obtain the reactive power target value of the wind farm grid connection point; Obtain the original sum of the reactive power limit values ​​for each reactive power source; The original sum is subjected to a delay filter to obtain a delayed sum. Based on the reactive power target value, the electrical measurement value, and the delay sum value, the reactive power command target value of the wind farm is determined; Based on the reactive power command target value, the delay sum value, and the reactive power capacity limit value of each reactive power source, the reactive power command value corresponding to each reactive power source is determined; Each reactive power source is controlled to output reactive power according to the reactive power command value corresponding to each reactive power source; The delay filtering is used to control the original sum value to change with a delay within a preset time period; The electrical measurement values ​​include at least the reactive power measurement values ​​at the wind farm grid connection point; The step of determining the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement value, and the delay sum value includes: performing a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value to obtain a first limiting value; obtaining the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is the filter value obtained by delay filtering the reactive power measurement value; executing PI control based on the reactive power difference value; and performing a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value. The step of determining the reactive power command value corresponding to each reactive power source based on the reactive power command target value, the delay sum value, and the reactive power capacity limit value of each reactive power source includes: calculating the reactive power allocation ratio between the reactive power command target value and the delay sum value; and determining the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power command value corresponding to each reactive power source.

2. The reactive voltage control method as described in claim 1, characterized in that, The process of obtaining the reactive power limit of each reactive power source currently in normal operation in the wind farm includes: In the event that multiple reactive power sources in the reactive power source group of the wind farm experience a batch shutdown or a batch communication interruption, the reactive power capacity limit of each reactive power source currently in normal operation in the reactive power source group is obtained.

3. The reactive voltage control method as described in claim 2, characterized in that, The inertial time constant corresponding to the delay filter has a value range of 0 seconds < T s < 60 seconds, of which, T s Let be the inertial time constant.

4. The reactive voltage control method as described in claim 1, characterized in that, The reactive power sources include wind turbines and centralized reactive power compensation equipment.

5. The reactive voltage control method as described in claim 1, characterized in that, The original sum value includes the original capacitive sum value and the original inductive sum value. The original capacitive sum value is the sum of the capacitive reactive power limit value of each reactive power source, and the original inductive sum value is the sum of the inductive reactive power limit value of each reactive power source. The first limiting process, which involves applying a preset upper limit and a preset lower limit to the reactive power command to the target reactive power value to obtain a first limiting value, includes: If the reactive power target value is greater than or equal to the preset reactive power command upper limit value, the preset reactive power command upper limit value is determined as the first limiting value; If the reactive power target value is less than or equal to the preset reactive power command lower limit value, the preset reactive power command lower limit value is determined as the first limiting value; If the reactive power target value is less than the preset reactive power command upper limit value and greater than the preset reactive power command lower limit value, the reactive power target value is determined as the first limit value.

6. The reactive voltage control method as described in claim 1, characterized in that, The electrical measurement values ​​include the reactive power measurement values ​​at the wind farm grid connection point and the voltage measurement values ​​at the wind farm grid connection point; the control command reference values ​​include the voltage command reference values. Obtaining the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement values ​​and the control command reference values ​​includes: The voltage measurement value is delayed and filtered to obtain the filtered voltage value; Obtain the voltage difference between the voltage command reference value and the voltage filter value; The product of the voltage difference and the preset voltage droop coefficient is obtained as the reactive power change value; The reactive power measurement value is delayed and filtered to obtain the reactive power filtered value. The sum of the reactive power change value and the reactive power filtering value is obtained as the reactive power target value.

7. The reactive voltage control method as described in claim 1, characterized in that, Obtaining the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement values ​​and the control command reference values ​​includes: The reactive power command reference value contained in the control command reference value is obtained as the reactive power target value.

8. The reactive voltage control method as described in claim 1, characterized in that, The electrical measurement values ​​include the active power measurement values ​​at the grid connection point of the wind farm, and the control command reference values ​​include the power factor command reference values; Obtaining the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement values ​​and the control command reference values ​​includes: Obtain the inverse cosine value of the power factor command reference value and the tangent value of the inverse cosine value; The active power measurement value is delayed and filtered to obtain the active power filtered value; The product of the active power filter value and the tangent value is obtained as the reactive power target value.

9. The reactive voltage control method as described in claim 1, characterized in that, The delay sum includes a delay-capacitance sum and a delay-insensitive sum, wherein the delay-capacitance sum and the delay-insensitive sum are obtained by delay filtering the original capacitance sum and the original sum, and the delay-insensitive sum and the delay-insensitive sum are obtained by delay filtering the original insensitive sum and the original sum. The calculation of the reactive power allocation ratio between the reactive power command target value and the delay sum value includes: When the reactive power instruction target value is of the capacitive type, the ratio of the reactive power instruction target value to the delay capacitive value is calculated as the reactive power allocation ratio. When the reactive power instruction target value is of the inductive type, the ratio of the reactive power instruction target value to the delay inductive value is calculated as the reactive power allocation ratio.

10. The reactive voltage control method as described in claim 1, characterized in that, The step of determining the product of the reactive power allocation ratio and the reactive power capacity limit of each reactive power source as the reactive power command value corresponding to each reactive power source includes: When the reactive power instruction target value is capacitive, the product of the reactive power allocation ratio and the capacitive reactive power capacity limit of each reactive power source is determined as the reactive power instruction value corresponding to each reactive power source. When the reactive power command target value is of the inductive type, the product of the reactive power allocation ratio and the inductive reactive power capacity limit of each reactive power source is determined as the reactive power command value corresponding to each reactive power source.

11. A reactive power and voltage control system for a wind farm, characterized in that, include: The parameter value acquisition module is configured to acquire electrical measurement values ​​at the wind farm grid connection point, reference values ​​of control commands issued by the power grid to the wind farm, and the reactive power limit values ​​of each reactive power source currently in normal operation in the wind farm. The reactive power target value acquisition module is configured to acquire the reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement value and the control command reference value. The original sum value acquisition module is configured to acquire the original sum value of the reactive power limit value of each reactive power source; A delay filtering module is configured to perform delay filtering on the original sum value to obtain a delayed sum value; The reactive power command target value determination module is configured to determine the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement value, and the delay sum value. The reactive power instruction value determination module is configured to determine the reactive power instruction value corresponding to each reactive power source based on the reactive power instruction target value, the delay sum value, and the reactive power capacity limit value of each reactive power source. The reactive power output control module is configured to control each reactive power source to output reactive power according to the reactive power command value corresponding to each reactive power source. The delay filtering is used to control the original sum value to change with a delay within a preset time period; The electrical measurement values ​​include at least the reactive power measurement values ​​at the wind farm grid connection point; The reactive power command target value determination module is configured to: perform a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value to obtain a first limiting value; obtain the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is a filtered value obtained by delaying the reactive power measurement value; execute PI control based on the reactive power difference; and perform a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value. The reactive power instruction value determination module is configured to: calculate the reactive power allocation ratio between the reactive power instruction target value and the delay sum value; and determine the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power instruction value corresponding to each reactive power source.

12. A new energy power station, characterized in that, include: The reactive voltage control system of the wind farm, and the reactive power source connected to the reactive voltage control system of the wind farm; The reactive power and voltage control system of the wind farm is used to: acquire electrical measurement values ​​at the grid connection point of the wind farm, reference values ​​of control commands issued by the grid to the wind farm, and the reactive power limit value of each reactive source in the wind farm that is currently in normal operation. Based on at least one of the electrical measurement values ​​and the control command reference values, obtain the reactive power target value of the wind farm grid connection point; Obtain the original sum of the reactive power limit values ​​for each reactive power source; The original sum is subjected to a delay filter to obtain a delayed sum. Based on the reactive power target value, the electrical measurement value, and the delay sum value, the reactive power command target value of the wind farm is determined; Based on the reactive power command target value, the delay sum value, and the reactive power capacity limit value of each reactive power source, the reactive power command value corresponding to each reactive power source is determined; Each reactive power source is controlled to output reactive power according to the reactive power command value corresponding to each reactive power source; The delay filtering is used to control the original sum value to change with a delay within a preset time period; The electrical measurement values ​​include at least the reactive power measurement values ​​at the wind farm grid connection point; The step of determining the reactive power command target value of the wind farm based on the reactive power target value, the electrical measurement value, and the delay sum value includes: performing a first limiting process on the reactive power target value using a preset upper limit value and a preset lower limit value to obtain a first limiting value; obtaining the reactive power difference between the first limiting value and the reactive power filter value, wherein the reactive power filter value is the filter value obtained by delay filtering the reactive power measurement value; executing PI control based on the reactive power difference value; and performing a second limiting process on the output value of the PI control using the delay sum value to obtain the reactive power command target value. The step of determining the reactive power command value corresponding to each reactive power source based on the reactive power command target value, the delay sum value, and the reactive power capacity limit value of each reactive power source includes: calculating the reactive power allocation ratio between the reactive power command target value and the delay sum value; and determining the product of the reactive power allocation ratio and the reactive power capacity limit value of each reactive power source as the reactive power command value corresponding to each reactive power source.

13. The new energy power station as described in claim 12, characterized in that, The reactive power source includes a fan and a centralized reactive power compensation device, wherein the fan is a doubly fed fan and / or a direct-drive fan.

14. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the reactive voltage control method for a wind farm as described in any one of claims 1 to 10.

15. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the reactive voltage control method for a wind farm as described in any one of claims 1 to 10.

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