Reactive voltage control method and system for wind power plant, electronic equipment and storage medium

Abstract

The invention relates to a reactive voltage control method and system for a wind power plant, electronic equipment and a storage medium. The reactive voltage control method comprises the following steps: acquiring an electrical measurement value, a control instruction reference value and a reactive capacity limit value of each reactive power source in a normal operation state at present; obtaining a reactive target value of a wind power plant grid-connected point; carrying out delay filtering on the original sum value of the reactive power capacity limit value of each reactive power source to obtain a delay sum value; determining a reactive instruction target value of the wind power plant; and determining a 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. In the reactive power calculation process of the reactive power source group, the real-time reactive power of the reactive power source group is not directly adopted, and delay filtering is performed on the real-time reactive power of the reactive power source group, so that sudden change of the actual reactive power of the reactive power source group can be avoided, sudden change of the reactive power distribution instruction can be further avoided, and the reactive power distribution efficiency is improved. And the reliability of reactive power control and the stability of system operation can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and more specifically, to a reactive voltage control method, system, electronic device and storage medium of a wind farm. Background Art

[0002] At present, reactive power distribution of wind turbines is often carried out based on the overall reactive power of wind farms. In the actual operation of wind turbines, wind turbines are often partially connected to the grid, started and shut down in batches, or communication interruptions of wind turbines due to their decentralized distribution and small capacity. When the fleet is shut down in batches, the state change time of the units occurs in a short period of time, generally a few hundred milliseconds, which will cause the reactive power command of the controlled units to change sharply in a short period of time, that is, it will increase sharply in a short period of time; and, if the communication of the units is restored immediately after the batch communication is interrupted, the reactive power command of the controlled units will decrease sharply in a short period of time.

[0003] It can be seen that under the above-mentioned circumstances, the actual reactive capacity 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 wind turbine failure and equipment damage. Therefore, in the related technology, the stability and reliability of reactive power control of wind turbines are poor. Summary of the invention

[0004] The present disclosure provides a reactive voltage control method, system, electronic device and storage medium for a wind farm, so as to at least solve the problem of poor stability and reliability of reactive voltage control of wind turbines in the above-mentioned related technologies.

[0005] According to a first aspect of an embodiment of the present disclosure, a reactive voltage control method for a wind farm is provided, comprising: obtaining an electrical measurement value of a wind farm grid-connected point, a control instruction reference value of the wind farm issued by a power grid, and a reactive capacity limit value of each reactive source in the wind farm that is currently in a normal operating state; obtaining a reactive target value of the wind farm grid-connected point based on the electrical measurement value and at least one of the control instruction reference values; obtaining an original sum value of the reactive capacity limit value of each reactive source; performing delay filtering on the original sum value to obtain a delayed sum value; determining a reactive instruction target value of the wind farm based on the reactive target value, the electrical measurement value, and the delayed sum value; determining a reactive instruction value corresponding to each reactive source based on the reactive instruction target value, the delayed sum value, and the reactive capacity limit value of each reactive source; controlling each reactive source to perform reactive output according to the reactive instruction value corresponding to each reactive source; wherein the delay filtering is used to control the delayed change of the original sum value within a preset time period.

[0006] Optionally, obtaining the reactive capacity limit value of each reactive source currently in normal operation in the wind farm includes: when multiple reactive sources included in the reactive source group of the wind farm are shut down or started and shut down in batches, or batch communication of units is interrupted, obtaining the reactive capacity limit value of each reactive source currently in normal operation included in the reactive source group.

[0007] Optionally, the value range of the inertia time constant corresponding to the delay filter is 0 seconds <T s <60 seconds, where T s is the inertia time constant.

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

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

[0010] Optionally, the original sum value includes an original capacitive sum value and an original inductive sum value, the original capacitive sum value is the sum value of the capacitive reactive capacity limit value of each reactive source, and the original inductive sum value is the sum value of the inductive reactive capacity limit value of each reactive source; the first limiting processing of the reactive target value by using a preset reactive instruction upper limit value and a preset reactive instruction lower limit value to obtain a first limiting value includes: when the reactive target value is greater than or equal to the preset reactive instruction upper limit value, determining the preset reactive instruction upper limit value as the first limiting value; when the reactive target value is less than or equal to the preset reactive instruction lower limit value, determining the preset reactive instruction lower limit value as the first limiting value; when the reactive target value is less than the preset reactive instruction upper limit value and greater than the preset reactive instruction lower limit value, determining the reactive target value as the first limiting value.

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

[0012] Optionally, acquiring 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 instruction reference value includes: acquiring the reactive power instruction reference value included in the control instruction reference value as the reactive power target value.

[0013] Optionally, the electrical measurement value includes the active measurement value of the wind farm grid-connected point, and the control instruction reference value includes the power factor instruction reference value; obtaining the reactive power target value of the wind farm grid-connected point based on at least one of the electrical measurement value and the control instruction reference value includes: obtaining the arccosine value of the power factor instruction reference value and the tangent value of the arccosine value; performing delay filtering on the active measurement value to obtain an active filter value; and obtaining the product of the active filter value and the tangent value as the reactive power target value.

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

[0015] Optionally, the delayed sum value includes a delayed capacitance and a delayed inductance, and the delayed capacitance and the delayed inductance are obtained by delaying filtering the original capacitance and the delayed inductance contained in the original sum value, and the delayed inductance is obtained by delaying filtering the original inductance contained in the original sum value; the calculation of the reactive distribution ratio of the reactive command target value and the delayed sum value includes: when the reactive command target value is of a capacitive type, calculating the ratio of the reactive command target value to the delayed capacitance and the delayed inductance as the reactive distribution ratio; when the reactive command target value is of an inductive type, calculating the ratio of the reactive command target value to the delayed inductance as the reactive distribution ratio.

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

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

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

[0019] Optionally, the value range of the inertia time constant corresponding to the delay filter is 0 seconds <T s <60 seconds, where T s is the inertia time constant.

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

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

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

[0023] Optionally, the electrical measurement value includes the reactive measurement value of the wind farm grid-connected point and the voltage measurement value of the wind farm grid-connected point, and the control instruction reference value includes the voltage instruction reference value; the reactive target value acquisition module is configured to: perform delay filtering on the voltage measurement value to obtain a voltage filter value; obtain the voltage difference between the voltage instruction reference value and the voltage filter value; obtain the product of the voltage difference and a preset voltage droop coefficient as a reactive change value; perform delay filtering on the reactive measurement value to obtain a reactive filter value; obtain the sum of the reactive change value and the reactive filter value as the reactive target value.

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

[0025] Optionally, the electrical measurement value includes the active measurement value of the wind farm grid-connected point, and the control instruction reference value includes the power factor instruction reference value; the reactive power target value acquisition module is configured to: obtain the arccosine value of the power factor instruction reference value and the tangent value of the arccosine value; perform delay filtering on the active measurement value to obtain an active filter value; and obtain the product of the active filter value and the tangent value as the reactive power target value.

[0026] Optionally, the reactive power command value determination module is configured to: calculate the reactive power distribution ratio of the reactive power command target value and the delayed sum value; and determine the product of the reactive power distribution ratio and the reactive power limit value of each reactive source as the reactive power command value corresponding to each reactive source.

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

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

[0029] According to a third aspect of an embodiment of the present disclosure, a new energy station is provided, comprising: a reactive voltage control system of a wind farm, and a reactive source connected to the reactive voltage control system of the wind farm; wherein the reactive voltage control system of the wind farm is used to: obtain electrical measurement values ​​of a wind farm grid connection point, a control instruction reference value of the wind farm issued by the power grid, and a reactive capacity 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 instruction reference value, obtain a reactive target value of the wind farm grid connection point; obtain each The invention discloses an original sum value of the reactive power limit value of the reactive source; performing delay filtering on the original sum value to obtain a delayed sum value; determining 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 value; determining the reactive power command value corresponding to each reactive source based on the reactive power command target value, the delayed sum value and the reactive power limit value of each reactive source; controlling each reactive source to perform reactive power output according to the reactive power command value corresponding to each reactive source; wherein the delay filtering is used to control the delayed change of the original sum value within a preset time period.

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

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

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

[0033] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0034] The original sum of the reactive capacity limit values ​​of each reactive source can be delayed and filtered, and then the reactive command value corresponding to each reactive source can be determined based on the obtained delayed sum. That is, in the reactive capacity calculation process of the reactive source group, the present disclosure does not directly use the real-time reactive capacity of the reactive source group, but delays and filters the real-time reactive capacity of the reactive source group, which can avoid sudden changes in the actual reactive capacity of the reactive source group, and then avoid sudden changes in the reactive distribution command. In this way, the present disclosure can make the overall reactive control smooth by adopting a flexible reactive control method, reduce the probability of abnormal fluctuations in the reactive distribution command due to changes in the operating conditions of the reactive source group, and is conducive to improving the reliability of reactive control and the stability of system operation, and optimizing the overall reactive control effect.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description are used to explain the principles of the present disclosure, and do not constitute improper limitations on the present disclosure.

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

[0038] Figure 2 is a flow chart showing a reactive voltage control method of a wind farm according to an exemplary embodiment of the present disclosure;

[0039] Figure 3 2 is a schematic diagram showing the structure of a reactive voltage control system AVC according to an exemplary embodiment of the present disclosure;

[0040] Figure 4 FIG. 1 is a diagram showing a method for determining a reactive power command target value Q of a wind farm according to an exemplary embodiment of the present disclosure. output Schematic diagram of the process;

[0041] Figure 5 is a schematic diagram showing a method of delay filtering an original sum value according to an exemplary embodiment of the present disclosure;

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

[0043] Figure 7 is a schematic diagram showing a flexible control of 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 is a specific implementation flow chart showing a reactive voltage control method of a wind farm according to an exemplary embodiment of the present disclosure;

[0045] Fig. 9 is a block diagram showing a reactive voltage control system of a wind farm according to an exemplary embodiment of the present disclosure;

[0046] Fig.10 is a block diagram illustrating an electronic device according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] In order to enable ordinary persons in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings.

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

[0049] It should be noted that the phrase "at least one of the items" in the present disclosure includes three types of parallel situations: "any one of the items", "a combination of any number of the items", and "all of the items". For example, "including at least one of A and B" includes the following three parallel situations: (1) including A; (2) including B; (3) including A and B. Another example is "executing at least one of step 1 and step 2" which means the following three parallel situations: (1) executing step 1; (2) executing step 2; (3) executing step 1 and step 2.

[0050] At present, reactive power distribution of wind turbines is often carried out based on the overall reactive power capacity of wind farms. In the actual operation of wind turbines, due to the characteristics of decentralized distribution and small capacity, wind turbines often have partial grid connection, batch shutdown or unit communication interruption. In these cases, the actual reactive power capacity of the wind turbine group will change suddenly. At this time, the reactive power distribution instructions of the controlled units will also change sharply with a large amplitude in a short period of time, which may cause abnormal fluctuations in the overall reactive power control, and in severe cases may even cause wind turbine failure shutdown and equipment damage. Therefore, in the related art, the stability and reliability of reactive power control of wind turbines are poor.

[0051] In order to solve the above problems existing in the related art, the reactive voltage control method, system, electronic device and storage medium of the wind farm provided by the present disclosure can delay and filter the original sum value of the reactive capacity limit value of each reactive source, and then determine the reactive command value corresponding to each reactive source based on the obtained delayed sum value. That is, in the reactive capacity calculation process of the reactive source group, the present disclosure does not directly use the real-time reactive capacity of the reactive source group, but delays and filters the real-time reactive capacity of the reactive source group, which can avoid the sudden change of the actual reactive capacity of the reactive source group, and then avoid the sudden change of the reactive distribution command. In this way, the present disclosure can make the overall reactive control smooth by adopting a flexible reactive control method, reduce the probability of abnormal fluctuation of the reactive distribution command due to changes in the operating conditions of the reactive source group, which is conducive to improving the reliability of reactive control and the stability of system operation, and optimizes the overall reactive control effect.

[0052] Figure 1 is a schematic diagram showing a new energy station according to an exemplary embodiment of the present disclosure. Figure 1 The wind farm's reactive voltage control system 100 (Automatic Voltage Control, AVC) is in the central control link. The AVC may be a device or system for performing reactive voltage control in the power system. Figure 1 Also shown is a reactive source 1011 connected to the AVC.

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

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

[0055] According to an exemplary embodiment of the present disclosure, the 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 double-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 voltage control system 100 of the wind farm can be connected to the host workstation 106 and the telecontrol device 107 via the Modbus TCP protocol to achieve input and output; the reactive voltage control system 100 of the wind farm can be connected to the dispatching private network via the IEC104 and DNP 3.0 protocols through the vertical encryption device 108, and then connected to the power grid company's AVC system 109 or the power grid company's AGC system 1010.

[0057] The reactive voltage control system 100 of the wind farm can be connected to the photovoltaic inverter 101 through the Modbus TCP, IEC 104, and DNP 3.0 protocols; and can be connected to the energy storage device 102, the synchronous phase condenser 103, the centralized reactive compensation device 10112, and the switching reactive compensation device 1012 through the Modbus TCP, IEC 104, and IEC 61850 protocols; and can be connected to the wind turbine 10111 through the Modbus TCP, IEC 104, OPC UA, and DNP 3.0 protocols. It should be noted that the protocol used for the network connection is not limited to the above protocols, but can also be other protocols, and the above implementation is only an exemplary description.

[0058] Figure 2 is a flow chart showing a reactive voltage control method of a wind farm according to an exemplary embodiment of the present disclosure.

[0059] Reference Figure 2 In step 201, electrical measurement values ​​of the wind farm grid connection point, reference values ​​of wind farm control instructions issued by the power grid, and reactive capacity limits of each reactive source currently in normal operation in the wind farm may 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, which is used to generate electricity and transmit the generated electricity to various power-consuming devices through the external power grid. The "wind farm grid connection point" can also be called the "control point".

[0061] According to an exemplary embodiment of the present disclosure, the reactive source may include a wind turbine and a centralized reactive compensation device, and the centralized reactive compensation device may include at least one of a static VAR compensator (SVC) and a static VAR generator (SVG). Below, the reactive voltage control method of the present disclosure is described by taking the reactive source including only a wind turbine as an example.

[0062] “Electrical measurement values ​​of wind farm grid connection points” can include reactive measurement values ​​Q of wind farm grid connection points meas , the voltage measurement value V at the wind farm grid connection point meas , the active power measurement value P of the wind farm grid connection point meas ; "The control command reference value of the wind farm issued by the power grid" can include the voltage command reference value V ref , reactive power command reference value Q ref , power factor command reference value Pf ref .

[0063] The reactive capacity limit of each fan can be Q WT_i , that is, the powerless capacity limit of the i-th unit can be Q WT_iAnd, according to the total reactive power command Q output The perceptibility of Q WT_i The value of is also different. output is a positive value (capacitive instruction), Q WT_i The value is the capacitive powerless capacity limit of the unit; when Q output When it is a negative value (inductive command), Q WT_i The value is the inductive non-functional capacity limit of the unit.

[0064] It should be noted that each unit, that is, each fan, reports its own powerless capacity limit value Q WT_i At the same time, it can also report its own status flag, which is used to indicate whether the corresponding wind turbine is in normal operation. Alternatively, the unit may not directly upload its own status flag, but report some parameters related to its own operating status to the reactive voltage control system AVC, and then the reactive voltage control system AVC determines whether the unit is in normal operation based on the relevant parameters reported by the unit. The present disclosure does not specifically limit the method of determining whether a unit is in normal operation.

[0065] Furthermore, the reactive voltage control system AVC provided by the present invention may include multiple functional modules, namely, "data acquisition module", "data forwarding interaction module", "sensitivity analysis module", "automatic voltage regulation and control module", "front-end human-computer interaction control platform", "data management platform", "comprehensive alarm module", and "operation analysis and evaluation module". Figure 3 FIG. 4 is a schematic diagram showing the structure of a reactive voltage control system AVC according to an exemplary embodiment of the present disclosure.

[0066] Here, the "data acquisition module" mainly completes the information collection of electrical analog quantities of the wind farm 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. Its implementation method can be an independent measurement and monitoring device, or a functional module in an integrated system. The former can communicate through the power grid or serial port, and the latter can communicate through the internal bus or other methods.

[0067] The "data forwarding interaction module" mainly realizes the communication between the reactive voltage control system AVC and the upstream and downstream devices. The data information may include remote measurement, remote signaling, etc. The communication protocol may include but is not limited to: serial communication protocol (Modbus), IEC60870-5-101 / 104, time-sensitive network technology based on OPC unified architecture (OPC Unified Architecture, OPC UA), etc.

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

[0069] The "Data Management Platform" is mainly a historical database that can save parameter settings, lock settings, and adjustment processes.

[0070] The "comprehensive alarm module" mainly provides the device's own fault diagnosis function, including but not limited to: communication anomalies, program crashes, protection triggers, etc. When an anomaly occurs, the device can alarm, stop running, and automatically adjust; when the anomaly disappears, the program can return to normal.

[0071] The "Operation Analysis and Evaluation Module" can conduct online evaluation of equipment operation, online analysis and calculation of control effects, and evaluation of the control effects of the overall system, etc. For example, it can evaluate, analyze, and evaluate the optimization control time, control cycle, strategy generation time, control qualification rate, etc.

[0072] The "automatic voltage regulation and control module" is the core module of the reactive voltage control system AVC. It mainly completes the overall strategy calculation and reactive power instruction generation, that is, it mainly optimizes the reactive power instruction allocation link.

[0073] According to an exemplary embodiment of the present disclosure, the present disclosure is mainly applied to the scenario of batch shutdown of reactive sources or batch communication interruption, that is, when multiple reactive sources included in the reactive source group of a wind farm are shut down in batches or batch communication is interrupted, the reactive capacity limit value of each reactive source currently in normal operation included in the reactive source group can be obtained.

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

[0075] Figure 4 FIG. 1 is a diagram showing a method for determining a reactive power command target value Q of a wind farm according to an exemplary embodiment of the present disclosure. output Schematic diagram of the process. Figure 4 , 1 / (1+ST Q )、1 / (1+ST V )、1 / (1+ST P ) are all filters, where T Q is the inertia time constant of reactive power measurement value, T Vis the voltage measurement inertia time constant, T P is the inertia time constant of the active measurement value, and S is the Laplace operator.

[0076] V error is the voltage difference, K droop is the preset voltage droop coefficient, Q error is the reactive power change value, Q target is the reactive power target value of the wind farm grid connection point, Q max,pos It is the preset reactive power command upper limit, that is, the capacitive reactive power capacity limit, and the default capacitive reactive power is positive, Q min,neg It is the preset reactive power command lower limit, that is, the inductive reactive power limit, and the inductive reactive power is negative by default.

[0077] K p +K i / S is a proportional integral controller, or PI controller, which consists of two parts: the proportional control part and the integral control part. The proportional control part adjusts the output in proportion to the size of the deviation; the integral control part adjusts the output by integrating the deviation until the steady-state error is eliminated. The expression of the PI controller can be:

[0078] K p ×e(t)+K i ×∫e(t)dt(1)

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

[0080] Q max is the upper limit of the PI control export instruction, that is, the capacitive reactive power limit, and the capacitive reactive power is assumed to be positive by default, and Q max The delayed capacitance and value obtained by delaying and filtering the sum of the capacitive reactive power limit values ​​of each fan in normal operation; Q min is the lower limit of the PI control output command, that is, the inductive reactive power limit, and the inductive reactive power is negative by default, and Q min The delayed inductive sum is obtained by delaying and filtering the sum of the inductive reactive capacity limit values ​​of each fan in normal operation.

[0081] Q output is the reactive power command target value of the wind farm.

[0082] It should be noted that when calculating the reactive power target value Q targetThere are three modes: "voltage mode", "reactive mode" and "power factor mode". Figure 4 In the above, "V" stands for "voltage mode", "Q" stands for "reactive power mode" and "Pf" stands for "power factor mode". The following will explain the reactive power target value Q of the wind farm grid connection point in each of the above three modes. target The calculation process.

[0083] According to an exemplary embodiment of the present disclosure, the electrical measurement value may include a reactive measurement value Q of a wind farm grid connection point. meas , the voltage measurement value V at the wind farm grid connection point meas , the control command reference value can include a voltage command reference value V ref .

[0084] First, the voltage measurement value V meas Perform delay filtering to obtain a voltage filter value. For example, the filter 1 / (1+ST V ) for voltage measurement value V meas Perform delay filtering. As mentioned above, T V is the inertia time constant of the voltage measurement value, and S is the Laplace operator.

[0085] Then, the voltage command reference value V can be obtained ref The voltage difference between the voltage filter value V error Next, we can get the voltage difference V error With the preset voltage droop coefficient K droop The product of is taken as the reactive power change value Q error Then, the reactive power measurement value Q can be meas Perform delay filtering to obtain reactive filtering value. For example, the filter 1 / (1+ST Q ) for reactive power measurement value Q meas Perform delay filtering. As mentioned above, T Q is the inertia time constant of reactive power measurement, and S is the Laplace operator. Next, the reactive power change value Q can be obtained. error The sum of the reactive power filter value is taken as the reactive power target value Q target .

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

[0087] According to an exemplary embodiment of the present disclosure, the electrical measurement value may include an active measurement value P of a wind farm grid connection point. meas , the control command reference value can include the power factor command reference value Pfref .

[0088] First, the power factor command reference value Pf can be obtained ref The arc cosine value cos -1 (Pf ref ) and the arccosine value cos -1 (Pf ref ) is the tangent value of tan(cos -1 (Pf ref )). Then, the active measured value P meas Perform delay filtering to obtain the active filtering value. For example, the filter 1 / 91+ST P ) for active power measurement value P meas Perform delay filtering. As mentioned above, T P is the inertia time constant of the active measurement value, and S is the Laplace operator. Next, the active filter value and the tangent value tan(cos -1 (Pf ref The product of )) is taken as the reactive power target value Q target .

[0089] In step 203, the original sum of the reactive capacity limit of each reactive source may be obtained. As mentioned above, the reactive capacity limit of each wind turbine may be Q WT_i , that is, the powerless capacity limit of the i-th unit can be Q WT_i And, according to the total reactive power command Q output The perceptibility of Q WT_i The value of is also different. output is a positive value (capacitive instruction), Q WT_i The value is the capacitive powerless capacity limit value Q of the unit max_i ; When Q output When it is a negative value (inductive command), Q WT_i The value is the inductive reactive power limit value Q of the unit min_i ,Right now:

[0090]

[0091] Then the original sum of the reactive capacity limit of each fan is:

[0092]

[0093] in, is the original capacitance and value, For raw sensibility and value.

[0094] In step 204, the original sum value may be subjected to delay filtering to obtain a delayed sum value. For example, the original capacitance and value obtained by summing the capacitive reactive power limit value of each wind turbine may be subjected to delay filtering to obtain a delayed capacitance and value Q max In addition, the original inductive value obtained by summing the inductive reactive power limit value of each fan can be delayed and filtered to obtain the delayed inductive value Q min Among them, the delay filter is mainly used to control the above original and value to change with delay within a preset time period, that is, to change slowly.

[0095] Figure 5 is a schematic diagram showing a method of delay filtering an original sum value according to an exemplary embodiment of the present disclosure. Figure 5 , "WindFarm_WFT1.Q_Max_Capacity" is the original capacitance and value obtained by summing the capacitive reactive capacity limit of each wind turbine currently in normal operation. s ) Delay filtering is performed on the original capacitance and value to obtain the delayed capacitance and value Q max ; "WindFarm_WFT1.Q_Min_Capacity" is the original inductive value obtained by summing the inductive reactive capacity limit of each fan currently in normal operation. The filter 1 / (1+ST s ) Delay filtering is performed on the original sensibility and value to obtain the delayed sensibility and value Q min .

[0096] According to an exemplary embodiment of the present disclosure, the inertia time constant T corresponding to the above-mentioned delay filtering is s The value range can be 0 seconds <T s <60 seconds. Reasonable choice T s The value of can avoid abnormal fluctuations in reactive power control caused by shutdown and communication interruption. s The time constant is generally 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 to delay the non-functional force. Figure 5 The filtering method shown is only an exemplary description.

[0098] In this way, in the process of calculating the reactive power of the cluster, the real-time reactive power of the cluster is not directly used, but the real-time reactive power of the cluster is delayed and filtered, so that the change of the reactive power of the cluster can be spread over a time period, that is, the reactive power of the cluster can be controlled to change slowly within a certain time period, which can avoid sudden changes in the reactive power of the cluster, and further avoid sudden changes in the reactive power distribution command, and make the overall reactive power control smooth, reducing the probability of abnormal fluctuations in the reactive power distribution command due to changes in the operating conditions of the wind turbine cluster, which is beneficial to improving the reliability of reactive control and the stability of system operation, and optimizing the overall reactive power control effect.

[0099] In step 205, based on the reactive power target value Q target , electrical measurements, delays and values ​​Q max , Q min , determine the reactive power command target value Q of the wind farm output .

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

[0101] First, the preset reactive power command upper limit value Q max,pos And preset reactive power command lower limit value Q min,neg For reactive power target value Q target A first amplitude limiting process is performed to obtain a first amplitude limiting value. Then, a reactive difference between the first amplitude limiting value and the reactive filtering value can be obtained, wherein the reactive filtering value can be a reactive measurement value Q meas The filter value obtained by delay filtering. For example, the filter 1 / (1+ST Q ) for reactive power measurement value Q meas Next, PI control can be performed 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 and value to obtain the reactive power command target value Q output That is, the delay capacitance and the value Q can be used max and the delay inductance and value Q min The output result value of PI control is subjected to the second limiting process to obtain the reactive power command target value Q output .

[0102] In this way, by executing PI control, the steady-state error can be eliminated; by limiting the amplitude, the reactive power command target value Q can be guaranteed. output It is within a normal value range to avoid reactive power command target value Q output Abnormal situation where the value is too large or too small.

[0103] According to an exemplary embodiment of the present disclosure, as mentioned above, the original sum value may include the original capacitance and value And the original sensibility and value Original capacitance and value The capacitive reactive power limit Q of each reactive source can be max_i The sum value, the original sensibility and value The inductive reactive capacity limit Q of each reactive source can be min_i The sum value of .

[0104] At the reactive power target value Q target Greater than or equal to the preset reactive power command upper limit value Q max,pos In the case of Q target ≥Q max,pos In the case of max,pos Determined as the first limit value; 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 the case of min,neg Determined as the first limit value; at the reactive power target value Q target Less than the preset reactive power command upper limit value Q max,pos And it is greater than the preset reactive power command lower limit value Q min,neg In the case of target Determined as the first limit value.

[0105] It can be seen that at the reactive power target value Q target Falls below the preset reactive power command lower limit Q min,neg And preset reactive power command upper limit value Q max,pos When the reactive power target value Q target Determined as the first limit value; at the reactive power target value Q target Falls below the preset reactive power command lower limit Q min,neg And preset reactive power command upper limit value Q max,pos When the first limit value is outside the interval, the endpoint of the interval can be determined as the first limit value. In this way, the first limit value can be ensured to be within a normal value range, avoiding the abnormal situation that the first limit value is too large or too small.

[0106] In step 206, the reactive power command target value Q output , delay and value Q max , Q min And the reactive capacity limit Q of each reactive 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 unit.

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

[0108]

[0109] Q total is the reactive capacity limit of the group, according to the reactive power command target value Q of the wind farm output The difference in perceptibility, Q total The value of is also different. When the reactive power command target value Q output When the reactive power command is a capacitive command, Q total The delay capacity and value Q of the cluster can be max ; When the reactive power command target value Q output When the reactive power command is a negative value, that is, the reactive power command is an inductive command, Q total It can be the delayed inductance and value of the group, that is, the reactive power distribution ratio Q cmdf The value of is always positive. Specifically:

[0110]

[0111] Next, the reactive power sharing ratio Q can be determined cmdf The reactive capacity limit Q of each reactive source WT_i The product of is taken as the reactive power command value Q corresponding to 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 is a schematic diagram showing a reactive power command allocation process according to an exemplary embodiment of the present disclosure. In the above formulas, N is the total number of controlled units in the wind turbine group, that is, the wind turbines currently in normal operation.

[0115] It should be noted that in the case of 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 wind turbines that are currently shut down will not be taken into account when calculating the non-functional capacity limit of the computer group.

[0116] For example, assuming that the number of wind turbines currently in normal operation is 10, the powerless capacity limit of the cluster is the sum of the powerless capacity limits of each of the 10 wind turbines. If the wind turbine cluster is shut down in batches at this time, for example, assuming that 6 of the 10 wind turbines are shut down, the powerless capacity limit of the cluster becomes the sum of the powerless capacity limits of the remaining 4 wind turbines in normal operation. Since the state change time of the units occurs in a relatively short period of time, generally several hundred milliseconds, if the real-time powerless capacity of the cluster is not delayed and filtered, the real-time powerless capacity of the cluster will decrease rapidly in a short period of time, that is, the value of the denominator of formula (4) will decrease rapidly in a short period of time.

[0117] In addition, since the reactive power command target value Q is obtained output PI control was previously implemented, so the reactive power command target value Q output The change is slow, in some cases the reactive power command target value Q output The change of is very small, and can even be regarded as 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 will increase sharply. At this time, 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 the more extreme case, when the overall reactive power command and value Q output When the reactive power sharing ratio Q is greater than the current reactive power of the group, cmdf will become 1, and then the reactive output of each unit will change rapidly to the reactive capacity limit of the unit, which will cause abnormal fluctuations in the overall reactive power control.

[0118] Furthermore, if batch communication interruption occurs in the units and communication is restored immediately after the batch communication interruption, it will also cause abnormal fluctuations in the reactive power control of the units.

[0119] For example, assuming that there are 10 wind turbines currently in normal operation, if a batch communication interruption occurs in the wind turbine group at this time, for example, assuming that 9 of the 10 wind turbines have a communication interruption, then the reactive power limit of the group will become the reactive power limit of only the remaining 1 wind turbine in normal operation, that is, the reactive power output pressure of the 9 wind turbines with communication interruption will be transferred to the only remaining wind turbine in normal operation. At this time, if the real-time reactive power of the group is not delayed and filtered, the reactive power output of the only remaining wind turbine in normal operation will increase rapidly in a short time. In addition, 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 the real-time reactive power of the group is not delayed and filtered, the reactive power distribution ratio Q cmdf It will decrease sharply. At this time, the reactive power output of the only remaining wind turbine in normal operation will decrease rapidly in a short time. It can be seen that if the batch communication of the units is interrupted and then restored immediately, it will also cause abnormal fluctuations in the reactive power control of the units.

[0120] Therefore, in order to solve the problem that the overall reactive power control may fluctuate abnormally when the wind turbine group is shut down in batches or the communication of the units is interrupted, the present invention does not directly use the real-time reactive power of the wind turbine group in the reactive power calculation process of the wind turbine group, but delays and filters the real-time reactive power of the wind turbine group, so that the real-time reactive power of the wind turbine group can be controlled to change slowly, that is, the actual reactive power of the wind turbine group can be prevented from changing suddenly, and the reactive power distribution ratio Q can be controlled. cmdf Slow changes can eventually avoid sudden changes in reactive power distribution instructions. In this way, the present disclosure can make the overall reactive power control smooth by adopting a flexible reactive power control method, reduce the probability of abnormal fluctuations in reactive power distribution instructions due to changes in the operation of the wind turbine group, and help improve the reliability of reactive power control and the stability of system operation, and optimize the overall reactive power control effect.

[0121] According to an exemplary embodiment of the present disclosure, as mentioned above, the delay and value may include a delay capacitance and a value Q max and the delay inductance and value Q min . Delay capacitance and value Q max Can be the original capacitive and value contained in the original and value Delay filter obtained; delay sensitivity and value Q min Can be the original sensibility and value contained in the original and value Obtained by delay filtering.

[0122] The reactive power command target value Qoutput For capacitive type, that is, when Q output When >0, the reactive power command target value Q can be calculated output With the delay capacitance and the value of Q max The ratio of is taken as the reactive power sharing ratio Q cmdf , that is, at this time:

[0123]

[0124] The reactive power command target value Q output For the perceptual type, that is, in Q output When <0, the reactive power command target value Q can be calculated output With delay inductance and value Q min The ratio of is taken as the reactive power sharing ratio Q cmdf , that is, at this time:

[0125]

[0126] According to an exemplary embodiment of the present disclosure, when the reactive power command target value Q output For capacitive type, that is, when Q output When >0, the reactive power distribution ratio Q can be determined cmdf The capacitive reactive power limit Q of each reactive source max_ The product of is taken as the reactive power command value Q corresponding to each reactive power source set_i , that is, at this time:

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

[0128] The reactive power command target value Q output For the perceptual type, that is, in Q output When <0, the reactive power distribution ratio Q can be determined cmdf The inductive reactive capacity limit Q of each reactive source min_ The product of is taken as the reactive power command value Q corresponding to each reactive power source set_i , that is, at this time:

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

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

[0131] It should be noted that the above description process is carried out for wind turbine groups. In the actual control process, there are often other continuous controlled reactive sources, including static var compensator (SVC), static var generator (SVG), synchronous phase condenser, etc.

[0132] The static VAR generator SVG consists of a voltage source converter connected in parallel to the system. The capacitive or inductive reactive current output by the static VAR generator SVG is continuously adjustable and has nothing to do with the system voltage within the operating system voltage range.

[0133] Static VAR compensator SVC is composed of switching reactors and capacitors controlled by thyristors. Thyristors respond very quickly to control signals, and the number of on-off times is not limited. The reactive power output is related to the voltage.

[0134] The application scope of the present disclosure includes not only a wind farm including only a wind turbine generator set, but also a wind farm equipped with other reactive power sources and wind turbine generators.

[0135] Figure 7 1 is a schematic diagram showing a 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. Figure 7 "WindFarm_WTT1.Q_Max_Capacity" is the original capacitive sum value obtained by summing the capacitive reactive power limit value of each fan currently in normal operation; "WindFarm_WTT1.Q_Min_Capacity" is the original inductive sum value obtained by summing the inductive reactive power limit value of each fan currently in normal operation; "WindFarm_WTT1.Q_Max_A" is the currently available capacitive reactive power of the cluster; "WindFarm_WTT1.Q_Min_A" is the currently available inductive reactive power of the cluster.

[0136] "WindFarm_SVGT1.Q_Max_Capacity" is the original capacitance and value obtained by summing the capacitive non-functional capacity limit values ​​of each SVG currently in normal operation; "WindFarm_SVGT1.Q_Min_Capacity" is the original inductive and value obtained by summing the inductive non-functional capacity limit values ​​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 value obtained by summing the capacitive reactive capacity limit values ​​of each wind turbine and each SVG currently in normal operation; "WindFarm_WFT1.Q_Min_Capacity" is the original inductive sum value obtained by summing the inductive reactive capacity limit values ​​of each wind turbine and each SVG currently in normal operation; "WindFarm_WFT1.Q_Max_A" is the currently available capacitive reactive capacity of the cluster and the SVG group; "WindFarm_WFT1.Q_Min_A" is the currently available inductive reactive capacity of the cluster and the SVG group.

[0138] Using the filter 1 / (1+ST s ) Perform delay filtering on "WindFarm_WFT1.Q_Max_Capacity" to obtain the delay capacitance and value Q of the cluster and SVG cluster. max ; Using filter 1 / 1+ST s ) Perform delay filtering on "WindFarm_WFT1.Q_Min_Capacity" to obtain the delay sensibility and value Q of the machine group and SVG group min .

[0139] Figure 8 1 is a specific implementation flow chart showing a reactive voltage control method of a wind farm according to an exemplary embodiment of the present disclosure. In this embodiment, the reactive source is taken as a wind turbine as an example for explanation.

[0140] Reference Figure 8 In step 801, the reactive voltage control system AVC can obtain the reactive measurement value Q of the wind farm grid connection point. meas , voltage measurement value V meas , Active power measurement value P meas , the voltage command reference value V issued by the power grid ref , reactive power command reference value Q ref , power factor command reference value Pf ref , and the reactive capacity limit Q of each wind turbine currently in normal operation in the wind farm WT_i .

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

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

[0143] For example, if the “voltage mode” is selected, the reactive power measurement value Q of the wind farm grid connection point can be used. meas , the voltage measurement value V at the wind farm grid connection point meas And the voltage command reference value V ref To calculate the reactive power target value Q of the wind farm grid connection point target If "reactive mode" is selected, the reactive command reference value Q ref To calculate the reactive power target value Q of the wind farm grid connection point target If you select "Power Factor Mode", you can use the active power measurement value P of the wind farm grid connection point to calculate the power factor. meas And the power factor command reference value Pf ref To calculate the reactive power target value Q of the wind farm grid connection point target . Calculate reactive power target value Q in 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 voltage control system AVC sets the reactive power target value Q target A first limiting process is performed to obtain a first limiting value.

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

[0146] In step 804, the reactive voltage control system AVC may obtain a reactive difference between the first amplitude limit value and the reactive filter value. The reactive filter value may be a reactive measurement value Q meas The filter value obtained by delay filtering. As mentioned above, for example, the filter 1 / 1+ST Q ) for reactive power measurement value Q meas Perform delay filtering.

[0147] In step 805, the reactive voltage control system AVC performs PI control based on the reactive difference. As mentioned above, the PI controller consists of a proportional adjustment part and an integral adjustment part. The proportional adjustment part adjusts the output in proportion to the size of the deviation; the integral adjustment part adjusts the output by integrating and accumulating the deviation until the steady-state error is eliminated.

[0148] In step 806, the reactive voltage control system AVC uses a flexible reactive capacity strategy to calculate the flexible reactive capacity of the computer cluster.

[0149] As mentioned above, the original sum of the reactive capacity limit of each fan currently in normal operation can be calculated: Then, we can use the filter 1 / 1+ST s ) Delay filtering the original sum value to obtain the delayed sum value Q max , Q min , that is, to obtain the flexible non-functional capability of the fleet.

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

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

[0152] In step 808, the reactive voltage control system AVC is based on the reactive power command target value Q output And the flexible reactive power of the group is used to calculate the reactive power distribution ratio Q cmdf ,Right now:

[0153]

[0154] Among them, Q total It is the flexible non-functional capability of the fleet.

[0155] In step 809, the reactive voltage control system AVC is based on the reactive power distribution ratio Q cmdf And the reactive capacity limit Q of each fan WT_i , determine the reactive power command value Q corresponding to each fan 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 according to the reactive power command value Q corresponding to each wind turbine. set_i Produce reactive power.

[0158] It should be noted that the actual reactive capacity of the wind turbine group occupies a key position in the entire control strategy operation. On the one hand, it is very critical in the command limit of the deviation control, and on the other hand, it is also extremely important in the calculation of the reactive power distribution ratio. In the related art, when calculating the actual reactive capacity of the wind turbine group, a fixed value is often used, for example, the rated reactive capacity of the wind turbine group, or a real-time changing value is used, that is, the real-time reactive capacity of the wind turbine group is used. Both methods have obvious disadvantages. For the method of using a fixed value, the reactive control cannot be adjusted adaptively in real time, which will affect the saturation of the deviation control and further affect the overall reactive control; the method of using a real-time changing value will affect the calculation of the reactive power distribution ratio in the reactive command distribution process, and then cause greater fluctuations in the overall reactive control process.

[0159] In the present disclosure, a trade-off is achieved between the above two methods, that is, the deviation control limiting and reactive power distribution ratio calculation are comprehensively considered, so that the overall reactive power control has higher stability and reliability under all working conditions.

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

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

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

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

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

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

[0166] A reactive power command target value determination module 905 is configured to determine a 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] A reactive power command value determination module 906 is configured to determine a 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;

[0168] The reactive power output control module 907 is configured to control each reactive power source to perform reactive power output according to the reactive power instruction value corresponding to each reactive power source;

[0169] The delay filter 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 the present disclosure, the parameter value acquisition module 901 is configured as follows:

[0171] In the case that a plurality of reactive sources included in the reactive source group of the wind farm are shut down in batches or their communication is interrupted in batches, a reactive capacity limit value of each reactive source included in the reactive source group and currently in a normal operating state is obtained.

[0172] According to an exemplary embodiment of the present disclosure, the value range of the inertia time constant corresponding to the delay filter is 0 seconds <T s <60 seconds, where T s is the inertia time constant.

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

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

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

[0176] According to an exemplary embodiment of the present disclosure, the electrical measurement value includes a reactive measurement value of the wind farm grid-connected point and a voltage measurement value of the wind farm grid-connected point, and the control instruction reference value includes a voltage instruction reference value; the reactive target value acquisition module 902 is configured to: perform delay filtering on the voltage measurement value to obtain a voltage filter value; obtain a voltage difference between the voltage instruction reference value and the voltage filter value; obtain the product of the voltage difference and a preset voltage droop coefficient as a reactive change value; perform delay filtering on the reactive measurement value to obtain a reactive filter value; obtain the sum of the reactive change value and the reactive filter value as the reactive target value.

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

[0178] According to an exemplary embodiment of the present disclosure, the electrical measurement value includes the active measurement value of the wind farm grid-connected point, and the control instruction reference value includes the power factor instruction reference value; the reactive power target value acquisition module 902 is configured to: obtain the arccosine value of the power factor instruction reference value and the tangent value of the arccosine value; perform delay filtering on the active measurement value to obtain an active filter value; and obtain the product of the active filter value and the tangent value as the reactive power target value.

[0179] According to an exemplary embodiment of the present disclosure, the reactive instruction value determination module 906 is configured to: calculate the reactive distribution ratio of the reactive instruction target value and the delayed sum value; and determine the product of the reactive distribution ratio and the reactive capacity limit value of each reactive source as the reactive instruction value corresponding to each reactive source.

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

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

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

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

[0184] As an example, the electronic device 1000 may be a PC, a tablet device, a personal digital assistant, a smart phone, or other device capable of executing the above instructions. Here, the electronic device 1000 is not necessarily a single electronic device, but may also be any device or circuit capable of executing the above instructions (or instruction sets) individually or in combination. The electronic device 1000 may also be part of an integrated control system or a system manager, or may be configured as a portable electronic device interconnected with a local or remote (e.g., via wireless transmission) interface.

[0185] In the electronic device 1000, the 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. As an example and not limitation, the processor may also include an analog processor, a digital processor, a microprocessor, a multi-core processor, a processor array, a network processor, etc.

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

[0187] The memory 1001 may be integrated with the processor 1002, for example, by placing RAM or flash memory within an integrated circuit microprocessor or the like. In addition, the memory 1001 may include a separate device, such as an external disk drive, a storage array, or any other storage device that can be used by a database system. The memory 1001 and the processor 1002 may be operatively coupled, or may communicate with each other, such as through an I / O port, a network connection, etc., so that the processor 1002 can read files stored in the memory.

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

[0189] According to an exemplary embodiment of the present disclosure, a computer-readable storage medium may also be provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the reactive voltage control method of the wind farm. 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-RW, etc. , BD-RE, Blu-ray or optical disk storage, hard disk drive (HDD), solid state drive (SSD), card storage (such as, multimedia card, secure digital (SD) card or extreme digital (XD) card), magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk and any other device, any other device is configured to store computer programs and any associated data, data files and data structures in a non-transitory manner and provide the computer programs and any associated data, data files and data structures to a processor or computer so that the processor or computer can execute the computer program. The computer program in the above-mentioned computer-readable storage medium can be run in an environment deployed in a computer device such as a client, a host, an agent device, a server, etc. In addition, in one example, the computer program and any associated data, data files and data structures are distributed on a networked computer system, so that the computer program and any associated data, data files and data structures are stored, accessed and executed in a distributed manner by one or more processors or computers.

[0190] According to the reactive voltage control method, system, electronic device and storage medium of the wind farm disclosed in the present invention, in the reactive capacity calculation process of the reactive source group, the real-time reactive capacity of the reactive source group is not directly used, but the real-time reactive capacity of the reactive source group is delayed and filtered, so that the real-time reactive capacity of the reactive source group can be controlled to change slowly, that is, the actual reactive capacity of the reactive source group can be prevented from suddenly changing, and the reactive distribution ratio Q can be controlled. cmdf Slow changes can eventually avoid sudden changes in reactive power distribution instructions. In this way, the present disclosure can make the overall reactive power control smooth by adopting a flexible reactive power control method, reduce the probability of abnormal fluctuations in reactive power distribution instructions due to changes in the operation of the reactive source group, and help improve the reliability of reactive power control and the stability of system operation, and optimize the overall reactive power control effect.

[0191] Furthermore, by executing PI control, the steady-state error can be eliminated; by limiting the amplitude, the reactive power command target value Q can be guaranteed. output It is within a normal value range to avoid reactive power command target value Q output Abnormal situation where the value is too large or too small.

[0192] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0193] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A reactive voltage control method for a wind farm, characterized in that: include: Obtain electrical measurement values ​​of the wind farm grid connection point, control instruction reference values ​​of the wind farm issued by the power grid, and reactive capacity limit values ​​of each reactive source currently in normal operation in the wind farm; Based on at least one of the electrical measurement value and the control instruction reference value, obtaining a reactive power target value of the wind farm grid connection point; Obtaining an original sum value of the reactive capacity limit value of each reactive source; Performing delay filtering on the original sum value to obtain a delayed sum value; Determining a 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; Determine a 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; Controlling each reactive source to perform reactive power output according to a reactive command value corresponding to each reactive source; The delay filter is used to control the original sum value to change with a delay within a preset time period.

2. The reactive voltage control method according to claim 1, characterized in that: The step of obtaining the reactive capacity limit value of each reactive source currently in a normal operating state in the wind farm includes: In the case that a plurality of reactive sources included in the reactive source group of the wind farm are shut down in batches or their communication is interrupted in batches, a reactive capacity limit value of each reactive source included in the reactive source group and currently in a normal operating state is obtained.

3. The reactive voltage control method according to claim 2, characterized in that: The value range of the inertia time constant corresponding to the delay filter is 0 seconds <T s <60 seconds, where T s is the inertia time constant.

4. The reactive voltage control method according to claim 1, characterized in that: The reactive power source includes a wind turbine and a centralized reactive power compensation device.

5. The reactive voltage control method according to claim 1, characterized in that: The electrical measurement values ​​at least include reactive power measurement values ​​of the wind farm grid connection point; The step of determining a reactive power command target value of a wind farm based on the reactive power target value, the electrical measurement value, and the delay and value comprises: Performing a first amplitude limiting process on the reactive target value by using a preset reactive instruction upper limit value and a preset reactive instruction lower limit value to obtain a first amplitude limiting value; Acquire a reactive difference between the first amplitude limit value and a reactive filter value, wherein the reactive filter value is a filter value obtained by delay filtering the reactive measurement value; Performing PI control based on the reactive power difference; The output result value of the PI control is subjected to a second limiting process using the delay sum value to obtain the reactive power instruction target value.

6. The reactive voltage control method according to claim 5, characterized in that: 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 value of the capacitive reactive power limit value of each reactive source, and the original inductive sum value is the sum value of the inductive reactive power limit value of each reactive source; The method of performing a first amplitude limiting process on the reactive target value by using a preset reactive instruction upper limit value and a preset reactive instruction lower limit value to obtain a first amplitude limiting value includes: When the reactive power target value is greater than or equal to the preset reactive power instruction upper limit value, determining the preset reactive power instruction upper limit value as the first amplitude limit value; When 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 amplitude limit value; When the reactive power target value is smaller than the preset reactive power command upper limit value and larger than the preset reactive power command lower limit value, the reactive power target value is determined as the first amplitude limit value.

7. The reactive voltage control method according to claim 1, characterized in that: The electrical measurement value includes a reactive measurement value of the wind farm grid connection point and a voltage measurement value of the wind farm grid connection point, and the control instruction reference value includes a voltage instruction reference value; The acquiring 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 instruction reference value comprises: Performing delay filtering on the voltage measurement value to obtain a voltage filtering value; Acquire a voltage difference between the voltage command reference value and the voltage filtering value; Obtaining the product of the voltage difference and a preset voltage droop coefficient as a reactive power change value; Performing delay filtering on the reactive measurement value to obtain a reactive filtering value; The sum of the reactive power change value and the reactive power filter value is obtained as the reactive power target value.

8. The reactive voltage control method according to claim 1, characterized in that: The acquiring 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 instruction reference value comprises: A reactive power instruction reference value included in the control instruction reference value is acquired as the reactive power target value.

9. The reactive voltage control method according to claim 1, characterized in that: The electrical measurement value includes the active measurement value of the wind farm grid connection point, and the control instruction reference value includes the power factor instruction reference value; The acquiring 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 instruction reference value comprises: Obtaining an arccosine value of the power factor command reference value and a tangent value of the arccosine value; Performing delay filtering on the active power measurement value to obtain an active power filtering value; The product of the active filtering value and the tangent value is obtained as the reactive power target value.

10. The reactive voltage control method according to claim 1, characterized in that: The 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 comprises: Calculating a reactive power distribution ratio between the reactive power instruction target value and the delayed sum value; The product of the reactive power distribution ratio and the reactive power capacity limit of each reactive source is determined as the reactive power instruction value corresponding to each reactive source.

11. The reactive voltage control method according to claim 10, characterized in that: The delayed sum value includes a delayed capacitance and value and a delayed inductance and value, wherein the delayed capacitance and value are obtained by delaying and filtering the original capacitance and value included in the original sum value, and the delayed inductance and value are obtained by delaying and filtering the original inductance and value included in the original sum value; The calculating of the reactive power distribution ratio between the reactive power instruction target value and the delayed sum value comprises: In the case where the reactive power command target value is of a capacitive type, calculating a ratio of the reactive power command target value to the delay capacitive value as the reactive power distribution ratio; In the case where the reactive power command target value is of the inductive type, a ratio of the reactive power command target value to the delayed inductive value is calculated as the reactive power distribution ratio.

12. The reactive voltage control method according to claim 10, characterized in that: The step of determining the product of the reactive power distribution ratio and the reactive power capacity limit of each reactive source as the reactive power instruction value corresponding to each reactive source includes: In the case where the reactive power command target value is of a capacitive type, determining the product of the reactive power distribution ratio and the capacitive reactive power capacity limit value of each reactive source as the reactive power command value corresponding to each reactive source; In the case where the reactive power command target value is of the inductive type, the product of the reactive power distribution ratio and the inductive reactive power capacity limit value of each reactive source is determined as the reactive power command value corresponding to each reactive source.

13. A reactive voltage control system for a wind farm, characterized in that: include: A parameter value acquisition module is configured to acquire electrical measurement values ​​of the wind farm grid connection point, a control instruction reference value of the wind farm issued by the power grid, and a reactive capacity limit value of each reactive source currently in a normal operating state in the wind farm; A reactive power target value acquisition module, configured to acquire a reactive power target value of the wind farm grid connection point based on at least one of the electrical measurement value and the control instruction reference value; An original sum value acquisition module is configured to acquire an original sum value of the reactive capacity limit value of each reactive source; A delay filtering module is configured to perform delay filtering on the original sum value to obtain a delayed sum value; A reactive power command target value determination module is configured to determine a reactive power command target value of a wind farm based on the reactive power target value, the electrical measurement value, and the delay sum value; A reactive command value determination module is configured to determine a reactive command value corresponding to each reactive source based on the reactive command target value, the delay sum value and the reactive capacity limit value of each reactive source; A reactive power output control module is configured to control each reactive source to perform reactive power output according to a reactive power instruction value corresponding to each reactive source; The delay filter is used to control the original sum value to change with a delay within a preset time period.

14. A new energy station, characterized in that: include: A reactive voltage control system of a wind farm, and a reactive source connected to the reactive voltage control system of the wind farm; The reactive voltage control system of the wind farm is used to obtain the electrical measurement value of the wind farm grid connection point, the control instruction reference value of the wind farm issued by the power grid, and the reactive capacity 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 value and the control instruction reference value, obtaining a reactive power target value of the wind farm grid connection point; Obtaining an original sum value of the reactive capacity limit value of each reactive source; Performing delay filtering on the original sum value to obtain a delayed sum value; Determining a 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; Determine a 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; Controlling each reactive source to perform reactive power output according to a reactive command value corresponding to each reactive source; The delay filter is used to control the original sum value to change with a delay within a preset time period.

15. The new energy station according to claim 14, characterized in that: The reactive power source includes a wind turbine and a centralized reactive power compensation device, and the wind turbine is a double-fed wind turbine and / or a direct-drive wind turbine.

16. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the reactive voltage control method for a wind farm according to any one of claims 1 to 12.

17. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the reactive voltage control method for a wind farm according to any one of claims 1 to 12.

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