Wind power plant reactive power control method, system, equipment, medium and product

Abstract

The invention discloses a wind power plant reactive power control method, system, equipment, medium and product, and relates to the technical field of power system reactive power control, working condition parameters of a wind power plant to be regulated and controlled are obtained, reactive power compensation analysis is carried out on the working condition parameters, and a given reactive power value is obtained; the working condition parameters and the given reactive power value are input into a preset reactive power output control model, the reactive power output control model comprises a voltage stabilization module and an adjusting module, the voltage stabilization module is adopted to carry out integral transformation on the working condition parameters, and reactive power variable quantity is obtained; and performing power adjustment processing on the reactive power variation and the given reactive power through an adjustment module to obtain reactive power control instructions of the fans, and performing power adjustment on the associated fans by adopting the reactive power control instructions. The technical problem that the operation cost of the wind power plant is increased due to the fact that only the reactive power compensation device is used in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power control of power systems, and in particular to a method, system, equipment, medium and product for reactive power control of wind farms. Background Art

[0002] With the continuous development of wind turbine technology, variable speed constant frequency wind turbines have gradually become the mainstream models of wind farms, mainly including doubly fed asynchronous wind turbines and direct drive permanent magnet synchronous wind turbines. Variable speed constant frequency wind power technology realizes the decoupling control of active power and reactive power, and can independently adjust the active power and reactive power of the generator. Variable speed constant frequency wind turbines can be used as important reactive power sources for wind farms. However, due to the limitation of the heating of the wind turbine converter, the wind turbine cannot provide the corresponding reactive power for a long time within the declared power factor range. This will eventually lead to voltage fluctuations and flicker at the access point of the wind farm. Therefore, it is very important to regulate the reactive power of the wind farm.

[0003] At present, wind farms are equipped with reactive power compensation devices to smooth out voltage fluctuations in the power grid. However, in actual operation, relying solely on reactive power compensation devices will increase the demand for wind farms to be equipped with reactive power compensation devices, thereby increasing the operating costs of wind farms. Summary of the invention

[0004] The present invention provides a wind farm reactive power control method, system, equipment, medium and product, which solves the technical problem that the wind farm is equipped with reactive power compensation devices to smooth the voltage fluctuations of the power grid, but in actual operation, relying solely on reactive power compensation devices will increase the demand for the wind farm to be equipped with reactive power compensation devices, thereby increasing the operating cost of the wind farm.

[0005] A first aspect of the present invention provides a wind farm reactive power control method, comprising:

[0006] Acquiring operating parameters of the wind farm to be regulated, and performing reactive power compensation analysis on the operating parameters to obtain a given reactive power value;

[0007] Inputting the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module;

[0008] The voltage stabilization module is used to perform integral transformation on the operating condition parameters to obtain the reactive power variation;

[0009] The reactive power variation and the given reactive power are subjected to power regulation processing by the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated;

[0010] Each of the reactive power control instructions is used to adjust the power of the associated wind turbine.

[0011] Optionally, the step of performing reactive compensation analysis on the operating condition parameters to obtain a given reactive power value includes:

[0012] Determining the voltage of a remote control point of the wind farm to be regulated according to the operating condition parameters and a preset reactive power coefficient;

[0013] Matching the remote control point voltage in a preset reactive compensation adjustment list to obtain a reactive compensation adjustment amount;

[0014] Performing difference processing on the remote control point voltage and a preset control point reference voltage to obtain a control point voltage difference;

[0015] The control point voltage difference is multiplied by the reactive compensation adjustment amount to obtain a given reactive power value.

[0016] Optionally, the operating parameters include low-voltage bus active power, low-voltage bus reactive power, bus voltage and wind farm impedance, and the step of determining the remote control point voltage of the wind farm to be regulated according to the operating parameters and a preset reactive power coefficient includes:

[0017] Multiplying the low-voltage bus reactive power by a preset reactive coefficient to obtain a first product value;

[0018] Performing difference processing on the low-voltage bus active power and the first multiplication value to obtain a first difference;

[0019] Performing ratio processing on the first difference and the bus voltage to obtain a low-voltage side node current;

[0020] Multiplying the low-voltage side node current by the wind farm impedance to obtain a second multiplied value;

[0021] The bus voltage and the second product value are subjected to difference processing to obtain the remote control point voltage of the wind farm to be regulated.

[0022] Optionally, the voltage stabilization module includes a first differentiator and a first multiplier, and the step of using the voltage stabilization module to perform integral transformation on the operating condition parameter to obtain the reactive power variation includes:

[0023] The common point voltage value of the operating condition parameter is subjected to difference processing with a preset common point rated voltage value by the first difference device to obtain a common point voltage difference;

[0024] The first multiplier is used to multiply the common point voltage difference and a preset common point control coefficient to obtain a reactive power change.

[0025] Optionally, the regulating module includes a first operation module, a second operation module, a first PI regulator, a power decomposer and a second PI regulator group, and the step of performing power regulation processing on the reactive power variation and the given reactive power by the regulating module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated includes:

[0026] The reactive power variation and the given reactive power are added together by the first operation module to obtain a first reactive power setting value;

[0027] Performing difference processing on the first reactive power setting value and the pre-acquired total reactive power by the second operation module to obtain a second reactive power setting value;

[0028] Using the first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value;

[0029] Based on the pre-acquired number of wind turbines, the power decomposer is used to perform power distribution on the reactive power setting reference value to obtain a reactive power decomposition value;

[0030] The reactive power decomposition value and the pre-acquired motor reactive power data are input into the second PI regulator group for integral operation to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

[0031] Optionally, the first PI regulator includes an integral controller, a proportional controller and a third operation module, and the step of using the first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value includes:

[0032] Using the integral controller to perform an integral operation on the second reactive power setting value to obtain a first setting parameter value;

[0033] Proportional adjustment is performed on the second reactive power setting value by using the proportional controller to obtain a second setting parameter value;

[0034] The first setting parameter value and the second setting parameter value are added together by the third operation module to obtain a reactive power setting reference value.

[0035] A second aspect of the present invention provides a wind farm reactive power control method, comprising:

[0036] The acquisition module is used to obtain the operating parameters of the wind farm to be regulated, and perform reactive compensation analysis on the operating parameters to obtain a given reactive power value;

[0037] An input module, used for inputting the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module;

[0038] A first analysis module is used to perform integral transformation on the operating condition parameters using the voltage stabilization module to obtain a reactive power variation;

[0039] A second analysis module is used to perform power regulation processing on the reactive power variation and the given reactive power through the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated;

[0040] The regulating module is used to use each of the reactive power control instructions to regulate the power of the associated wind turbine.

[0041] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the wind farm reactive power control method as described in any one of the above items.

[0042] A fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the reactive power control method for a wind farm as described in any one of the above items is implemented.

[0043] A fifth aspect of the present invention provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the wind farm reactive power control method as described in any one of the above items.

[0044] It can be seen from the above technical solutions that the present invention has the following advantages:

[0045] The present invention obtains the operating parameters of the wind farm to be regulated, and performs reactive compensation analysis on the operating parameters to obtain a given reactive power value, and then inputs the operating parameters and the given reactive power value into the reactive output control model, thereby solving the reactive power control instructions of each wind turbine in the wind farm to be regulated. The given reactive power value is calculated based on the reactive compensation capacity of the wind farm to be regulated, and the reactive compensation capacity of the wind farm can be used to the maximum extent to reduce the reactive compensation device configured in the wind farm. The technical problem that the existing technology that only relying on reactive compensation devices will increase the demand for wind farms to be equipped with reactive compensation devices and increase the operating cost of wind farms is overcome. Compared with the prior art, the present invention calculates a given reactive power value based on the reactive compensation capacity of the wind farm to be regulated, and inputs the given reactive power value into the reactive processing control model, thereby obtaining the reactive power control instructions of each wind turbine in the wind farm to be regulated, thereby realizing the maximum utilization of the reactive power capacity of each wind turbine and reducing the operating cost of the wind farm. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0047] Figure 1 A flowchart of a method for reactive power control in a wind farm provided in the first embodiment of the present invention;

[0048] Figure 2 A flowchart of a method for reactive power control in a wind farm provided in the second embodiment of the present invention;

[0049] Figure 3 A schematic diagram of the structure of a reactive power output control model provided in the second embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of a first PI regulator provided in Embodiment 2 of the present invention;

[0051] Figure 5 A schematic diagram of the structure of a second PI regulator provided in Embodiment 2 of the present invention;

[0052] Figure 6 A schematic diagram of the structure of a power decomposer provided in Embodiment 2 of the present invention;

[0053] Figure 7 A schematic diagram of the structure of the line between the wind farm and the power grid provided in the second embodiment of the present invention;

[0054] Figure 8A structural block diagram of a wind farm reactive power control system provided by Embodiment 3 of the present invention;

[0055] Fig. 9 This is a structural block diagram of an electronic device provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0056] The embodiments of the present invention provide a wind farm reactive power control method, system, equipment, medium and product, which can be used to solve the technical problem that the wind farm is equipped with reactive power compensation devices to smooth the voltage fluctuations of the power grid, but in actual operation, the wind turbines basically do not participate in reactive power regulation, resulting in large-capacity low-cost reactive power capacity being idle, increasing the demand for the wind farm to be equipped with reactive power compensation devices, and further increasing the operating cost of the wind farm.

[0057] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] See also Figure 1 , Figure 1 This is a flowchart of a reactive power control method for a wind farm provided in Embodiment 1 of the present invention.

[0059] The present invention provides a wind farm reactive power control method, comprising:

[0060] Step 101: Acquire the operating parameters of the wind farm to be regulated, and perform reactive power compensation analysis on the operating parameters to obtain a given reactive power value.

[0061] The operating parameters refer to the low-voltage bus active power, low-voltage bus reactive power, bus voltage, wind farm impedance and common point voltage value of the wind farm to be regulated.

[0062] In an embodiment of the present invention, the low-voltage bus active power, low-voltage bus reactive power, bus voltage, wind farm impedance and common point voltage value of the wind farm to be regulated are obtained, and reactive compensation analysis is performed based on the low-voltage bus active power, low-voltage bus reactive power, bus voltage and wind farm impedance to obtain a given reactive power value.

[0063] Step 102: Input the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module.

[0064] In an embodiment of the present invention, the common point voltage value and the given reactive power value are input into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module.

[0065] Step 103: Use the voltage stabilization module to perform integral transformation on the operating parameters to obtain reactive power variation.

[0066] In an embodiment of the present invention, the common point voltage value is input into a voltage stabilization module for voltage control to obtain a reactive power variation, wherein the voltage stabilization module includes a first differentiator and a first multiplier.

[0067] Step 104: Perform power regulation processing on the reactive power variation and the given reactive power through the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

[0068] In the embodiment of the present invention, the reactive power variation and the given reactive power input regulation module are used to perform reactive power distribution, and reactive power control instructions for each wind turbine in the wind farm to be regulated are obtained.

[0069] Step 105: Use each reactive power control instruction to adjust the power of the associated wind turbines.

[0070] In the embodiment of the present invention, the power of the associated wind turbines is adjusted through each reactive power control instruction, thereby achieving reactive power adjustment of the wind farm.

[0071] In an embodiment of the present invention, the operating parameters of the wind farm to be regulated are obtained, and reactive compensation analysis is performed on the operating parameters to obtain a given reactive power value, and then the operating parameters and the given reactive power value are input into the reactive output control model, thereby solving the reactive power control instructions of each wind turbine in the wind farm to be regulated. The given reactive power value is calculated based on the reactive compensation capacity of the wind farm to be regulated, and the reactive compensation capacity of the wind farm can be used to the maximum extent to reduce the reactive compensation device configured in the wind farm. It overcomes the technical problem that the existing wind farm is equipped with a reactive compensation device to smooth the voltage fluctuation of the power grid, but in actual operation, the wind turbines are basically not involved in reactive power regulation, resulting in large-capacity low-cost reactive power capacity being idle, which increases the operating cost of the wind farm. Compared with the prior art, the present invention calculates a given reactive power value according to the reactive compensation capacity of the wind farm to be regulated, and inputs the given reactive power value into a reactive processing control model, thereby obtaining a reactive power control instruction for each wind turbine in the wind farm to be regulated, thereby maximizing the utilization of the reactive power capacity of each wind turbine and reducing the operating cost of the wind farm.

[0072] See also Figure 2 , Figure 2 This is a flow chart of the steps of a wind farm reactive power control method provided in Embodiment 2 of the present invention.

[0073] The present invention provides a wind farm reactive power control method, comprising:

[0074] Step 201: Acquire the operating parameters of the wind farm to be regulated, and determine the remote control point voltage of the wind farm to be regulated according to the operating parameters and a preset reactive power coefficient.

[0075] Furthermore, the operating parameters include low-voltage bus active power, low-voltage bus reactive power, bus voltage and wind farm impedance. Step 201 includes the following sub-steps:

[0076] S11, multiplying the low-voltage bus reactive power by a preset reactive coefficient to obtain a first multiplied value;

[0077] S12, performing difference processing on the low-voltage bus active power and the first product value to obtain a first difference;

[0078] S13, performing ratio processing on the first difference and the bus voltage to obtain a low-voltage side node current;

[0079] In the embodiment of the present invention, the low-voltage bus reactive power, the low-voltage bus active power and the bus voltage are input into a preset node current function to obtain the low-voltage side node current.

[0080] It should be noted that the node current function is specifically:

[0081]

[0082] in, is the low voltage side node current, is the low voltage bus active power, is the low voltage bus reactive power, is the reactive power coefficient, is the bus voltage.

[0083] S14, multiplying the low-voltage side node current and the wind farm impedance to obtain a second multiplication value;

[0084] S15. Perform difference processing on the bus voltage and the second product value to obtain the remote control point voltage of the wind farm to be regulated.

[0085] In the embodiment of the present invention, refer to Figure 7 As shown, according to the topological diagram of the line between the power grid and the wind farm, it can be derived that the second product between the low-voltage side node current and the wind farm impedance is calculated, and the bus voltage and the second product are processed by difference to obtain the remote control point voltage of the wind farm to be regulated.

[0086] Step 202: Match the voltage of the remote control point in a preset reactive compensation adjustment list to obtain a reactive compensation adjustment amount.

[0087] In the embodiment of the present invention, the voltage of the remote control point is matched in a preset reactive compensation adjustment list to match the corresponding reactive compensation adjustment amount.

[0088] Step 203: perform difference processing on the remote control point voltage and the preset control point reference voltage to obtain the control point voltage difference.

[0089] In the embodiment of the present invention, the difference between the remote control point voltage and the preset control point reference voltage is calculated to obtain the control point voltage difference.

[0090] Step 204: multiply the voltage difference at the control point by the reactive compensation adjustment amount to obtain a given reactive power value.

[0091] In the embodiment of the present invention, the multiplication value between the voltage difference at the control point and the reactive compensation adjustment amount is calculated to obtain a given reactive power value.

[0092] Step 205: Input the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module.

[0093] In the embodiment of the present invention, refer to Figure 3 As shown, the common point voltage value of the operating condition parameter is input into the voltage stabilization module of the preset reactive power output control module, and the given reactive power value is input into the regulation module of the reactive power output control model.

[0094] Step 206: Use the voltage stabilization module to perform integral transformation on the operating parameters to obtain reactive power variation.

[0095] Further, the voltage stabilization module may include a first differentiator and a first multiplier, and step 206 may include the following sub-steps:

[0096] S21. Perform difference processing on the common point voltage value of the operating condition parameter and the preset common point rated voltage value through a first differentiator to obtain a common point voltage difference.

[0097] In the embodiment of the present invention, the common point voltage value of the operating condition parameter and the preset common point rated voltage value are input into the first differentiator for difference processing to obtain the common point voltage difference.

[0098] S22. Use a first multiplier to multiply the common point voltage difference and a preset common point control coefficient to obtain a reactive power change.

[0099] In the embodiment of the present invention, the common point voltage difference and the preset common point control coefficient are input into the first multiplier to obtain the reactive power variation.

[0100] Step 207: Perform power regulation processing on the reactive power variation and the given reactive power through the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

[0101] Further, the regulating module may include a first operation module, a second operation module, a first PI regulator, a power decomposer, and a second PI regulator group. Step 207 may include the following sub-steps:

[0102] S31. The reactive power variation and the given reactive power are added together by a first operation module to obtain a first reactive power setting value.

[0103] In the embodiment of the present invention, the first operation module is used to calculate the sum of the reactive power change and the given reactive power to obtain the first reactive power setting value.

[0104] S32. Perform difference processing on the first reactive power setting value and the pre-acquired total reactive power through a second operation module to obtain a second reactive power setting value.

[0105] The total reactive power refers to the sum of the reactive powers of all wind turbines in the wind farm at the previous moment.

[0106] In the embodiment of the present invention, a second operation module is used to calculate the difference between the first reactive power setting value and the total reactive power acquired in advance to obtain the second reactive power setting value.

[0107] S33. Use the first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value.

[0108] Further, the first PI regulator may include an integral controller, a proportional controller and a third operation module, and S33 may include the following sub-steps:

[0109] S331, using an integral controller to perform an integral operation on the second reactive power setting value to obtain a first setting parameter value;

[0110] S332, using a proportional controller to proportionally adjust the second reactive power setting value to obtain a second setting parameter value;

[0111] S333: Add the first setting parameter value and the second setting parameter value through a third operation module to obtain a reactive power setting reference value.

[0112] In the embodiment of the present invention, refer to Figure 4 As shown, the second reactive power setting value is input into the integral controller and the proportional controller respectively to obtain the first setting parameter value and the second setting parameter value. The third operation module is used to add the first setting parameter value and the second setting parameter value to obtain the reactive power setting reference value.

[0113] S34. Based on the pre-acquired number of wind turbines, a power decomposer is used to distribute power to the reactive power setting reference value to obtain a reactive power decomposition value.

[0114] The number of wind turbines refers to the number of wind turbines in the wind farm to be regulated.

[0115] In the embodiment of the present invention, referring to FIG6 , a reactive power decomposition value is obtained by performing ratio processing on a reactive power setting reference value and a pre-acquired number of wind turbines through a power decomposer.

[0116] S35, inputting the reactive power decomposition value and the pre-acquired motor reactive power data into the second PI regulator group for integration operation to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

[0117] It should be noted that, see Figure 3 As shown, the second PI regulator group includes a plurality of second PI regulators, and each second PI regulator is associated with a fan.

[0118] The motor reactive power data refers to the reactive power actually output by each wind turbine in the wind farm to be regulated at the previous moment.

[0119] In the embodiment of the present invention, refer to Figure 5 As shown, for each wind turbine in the wind farm to be regulated, taking wind turbine 1 as an example, the reactive power decomposition value and the pre-acquired motor reactive power (i.e., the reactive power actually output by wind turbine 1 at the last moment) are processed by the differential controller to obtain the intermediate power regulation value, and the intermediate power regulation value is input into the integral controller and the proportional controller respectively to obtain the first intermediate setting value and the second intermediate setting value. The first intermediate setting value and the second intermediate setting value are added by the summation controller to obtain the reactive power control instruction of wind turbine 1.

[0120] Step 208: Use each reactive power control instruction to adjust the power of the associated wind turbines.

[0121] In the embodiment of the present invention, the power of the associated wind turbines is adjusted according to each reactive power control instruction, thereby achieving reactive power regulation of the wind farm to be regulated.

[0122] In an embodiment of the present invention, the operating parameters of the wind farm to be regulated are obtained, and reactive compensation analysis is performed on the operating parameters to obtain a given reactive power value, and then the operating parameters and the given reactive power value are input into the reactive output control model, thereby solving the reactive power control instructions of each wind turbine in the wind farm to be regulated. The given reactive power value is calculated based on the reactive compensation capacity of the wind farm to be regulated, and the reactive compensation capacity of the wind farm can be used to the maximum extent to reduce the reactive compensation device configured in the wind farm. It overcomes the technical problem that the existing wind farm is equipped with a reactive compensation device to smooth the voltage fluctuation of the power grid, but in actual operation, the wind turbines are basically not involved in reactive power regulation, resulting in large-capacity low-cost reactive power capacity being idle, which increases the operating cost of the wind farm. Compared with the prior art, the present invention calculates a given reactive power value according to the reactive compensation capacity of the wind farm to be regulated, and inputs the given reactive power value into a reactive processing control model, thereby obtaining a reactive power control instruction for each wind turbine in the wind farm to be regulated, thereby maximizing the utilization of the reactive power capacity of each wind turbine and reducing the operating cost of the wind farm.

[0123] See also Figure 8 , Figure 8 This is a structural block diagram of a wind farm reactive power control system provided in Embodiment 3 of the present invention.

[0124] The present invention provides a wind farm reactive power control system, comprising:

[0125] The acquisition module 301 is used to obtain the operating parameters of the wind farm to be regulated, and perform reactive compensation analysis on the operating parameters to obtain a given reactive power value;

[0126] An input module 302, used to input the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module;

[0127] The first analysis module 303 is used to perform integral transformation on the operating condition parameters using the voltage stabilization module to obtain reactive power variation;

[0128] The second analysis module 304 is used to perform power regulation processing on the reactive power variation and the given reactive power through the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated;

[0129] The regulating module 305 is used to use each reactive power control instruction to regulate the power of the associated wind turbine.

[0130] Furthermore, the acquisition module 301 includes:

[0131] The first analysis submodule is used to determine the voltage of the remote control point of the wind farm to be regulated according to the operating parameters and the preset reactive power coefficient;

[0132] A matching submodule is used to match the voltage of the remote control point in a preset reactive compensation adjustment list to obtain a reactive compensation adjustment amount;

[0133] The second analysis submodule is used to perform difference processing on the remote control point voltage and the preset control point reference voltage to obtain the control point voltage difference;

[0134] The voltage difference at the control point is multiplied by the reactive compensation adjustment amount to obtain a given reactive power value.

[0135] Furthermore, the operating parameters include low-voltage bus active power, low-voltage bus reactive power, bus voltage and wind farm impedance. The first analysis submodule includes:

[0136] A first analysis unit is used to multiply the low-voltage bus reactive power by a preset reactive coefficient to obtain a first multiplied value;

[0137] A second analysis unit is used for performing difference processing on the low-voltage bus active power and the first product value to obtain a first difference value;

[0138] A third analysis unit is used to perform ratio processing on the first difference and the bus voltage to obtain a low-voltage side node current;

[0139] The fourth analysis unit is used to multiply the low-voltage side node current and the wind farm impedance to obtain a second multiplication value;

[0140] The bus voltage and the second product value are subjected to difference processing to obtain the remote control point voltage of the wind farm to be regulated.

[0141] Further, the voltage stabilization module includes a first differentiator and a first multiplier, and the first analysis module 303 includes:

[0142] The third analysis submodule is used to perform difference processing on the common point voltage value of the operating condition parameter and the preset common point rated voltage value through the first differentiator to obtain the common point voltage difference;

[0143] The fourth analysis submodule is used to use the first multiplier to multiply the common point voltage difference and the preset common point control coefficient to obtain the reactive power change.

[0144] Further, the regulating module includes a first operation module, a second operation module, a first PI regulator, a power decomposer and a second PI regulator group, and the second analysis module 304 includes:

[0145] A fifth analysis submodule, configured to perform a summation process on the reactive power variation and the given reactive power through the first operation module to obtain a first reactive power setting value;

[0146] a sixth analysis submodule, configured to perform difference processing on the first reactive power setting value and the pre-acquired total reactive power through the second operation module to obtain a second reactive power setting value;

[0147] A first regulating submodule, configured to use a first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value;

[0148] The power distribution submodule is used to distribute power to the reactive power setting reference value by using a power decomposer based on the pre-acquired number of wind turbines to obtain a reactive power decomposition value;

[0149] The second regulating submodule is used to input the reactive power decomposition value and the pre-acquired motor reactive power data into the second PI regulator group for integral operation to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

[0150] Furthermore, the first PI regulator includes an integral controller, a proportional controller and a third operation module, and the first regulation submodule includes:

[0151] An integration unit, used for performing an integration operation on the second reactive power setting value by using an integration controller to obtain a first setting parameter value;

[0152] A proportional unit, used for proportionally adjusting the second reactive power setting value by using a proportional controller to obtain a second setting parameter value;

[0153] The adding unit is used to perform a adding process on the first setting parameter value and the second setting parameter value through the third operation module to obtain a reactive power setting reference value.

[0154] See also Fig. 9 , Fig. 9 This is a structural block diagram of an electronic device provided in Embodiment 4 of the present invention.

[0155] An electronic device according to an embodiment of the present invention includes: a memory 401 and a processor 402, wherein the memory 402 stores a computer program; when the computer program is executed by the processor 402, the processor 402 executes a wind farm reactive power control method according to any of the above embodiments.

[0156] The memory 401 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 401 has a storage space 403 for a program code 413 for executing any method step in the above method. For example, the storage space 403 for the program code may include individual program codes 413 for implementing the various steps in the above method, respectively. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as a hard disk, a compact disk (CD), a memory card or a floppy disk. The program code may be compressed, for example, in an appropriate form. When these codes are run by a computing and processing device, the computing and processing device is caused to execute the various steps in the above-described method.

[0157] Embodiment 5 of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the reactive power control method for a wind farm as described in any of the above embodiments is implemented.

[0158] Embodiment 6 of the present invention further provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes a wind farm reactive power control method as described in any of the above embodiments.

[0159] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0160] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0161] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0162] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0163] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0164] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reactive power control method for a wind farm, characterized in that: include: Acquiring operating parameters of the wind farm to be regulated, and performing reactive power compensation analysis on the operating parameters to obtain a given reactive power value; Inputting the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module; The voltage stabilization module is used to perform integral transformation on the operating condition parameters to obtain a reactive power change; The reactive power variation and the given reactive power are subjected to power regulation processing by the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated; Each of the reactive power control instructions is used to adjust the power of the associated wind turbine.

2. The wind farm reactive power control method according to claim 1, characterized in that: The step of performing reactive compensation analysis on the operating condition parameters to obtain a given reactive power value comprises: Determining the voltage of a remote control point of the wind farm to be regulated according to the operating condition parameters and a preset reactive power coefficient; Matching the remote control point voltage in a preset reactive compensation adjustment list to obtain a reactive compensation adjustment amount; Performing difference processing on the remote control point voltage and a preset control point reference voltage to obtain a control point voltage difference; The control point voltage difference is multiplied by the reactive compensation adjustment amount to obtain a given reactive power value.

3. The wind farm reactive power control method according to claim 2, characterized in that: The operating parameters include low-voltage bus active power, low-voltage bus reactive power, bus voltage and wind farm impedance; the step of determining the remote control point voltage of the wind farm to be regulated according to the operating parameters and a preset reactive power coefficient includes: Multiplying the low-voltage bus reactive power by a preset reactive coefficient to obtain a first product value; Performing difference processing on the low-voltage bus active power and the first multiplication value to obtain a first difference; Performing ratio processing on the first difference and the bus voltage to obtain a low-voltage side node current; Multiplying the low-voltage side node current by the wind farm impedance to obtain a second multiplied value; The bus voltage and the second product value are subjected to difference processing to obtain the remote control point voltage of the wind farm to be regulated.

4. The wind farm reactive power control method according to claim 1, characterized in that: The voltage stabilization module includes a first differentiator and a first multiplier; the step of using the voltage stabilization module to perform integral transformation on the operating condition parameter to obtain the reactive power variation includes: The common point voltage value of the operating condition parameter is subjected to difference processing with a preset common point rated voltage value by the first difference device to obtain a common point voltage difference; The first multiplier is used to multiply the common point voltage difference and a preset common point control coefficient to obtain a reactive power change.

5. The reactive power control method for a wind farm according to any one of claims 1 to 4, characterized in that: The regulating module includes a first operation module, a second operation module, a first PI regulator, a power decomposer and a second PI regulator group; the step of performing power regulation processing on the reactive power variation and the given reactive power by the regulating module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated includes: The reactive power variation and the given reactive power are added together by the first operation module to obtain a first reactive power setting value; Performing difference processing on the first reactive power setting value and the pre-acquired total reactive power by the second operation module to obtain a second reactive power setting value; Using the first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value; Based on the pre-acquired number of wind turbines, the power decomposer is used to perform power distribution on the reactive power setting reference value to obtain a reactive power decomposition value; The reactive power decomposition value and the pre-acquired motor reactive power data are input into the second PI regulator group for integral operation to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated.

6. The wind farm reactive power control method according to claim 5, characterized in that: The first PI regulator includes an integral controller, a proportional controller and a third operation module. The step of using the first PI regulator to perform an integral operation on the second reactive power setting value to obtain a reactive power setting reference value includes: Using the integral controller to perform an integral operation on the second reactive power setting value to obtain a first setting parameter value; Proportional adjustment is performed on the second reactive power setting value by using the proportional controller to obtain a second setting parameter value; The first setting parameter value and the second setting parameter value are added together by the third operation module to obtain a reactive power setting reference value.

7. A wind farm reactive power control system, characterized in that: include: The acquisition module is used to obtain the operating parameters of the wind farm to be regulated, and perform reactive compensation analysis on the operating parameters to obtain a given reactive power value; An input module, used for inputting the operating condition parameters and the given reactive power value into a preset reactive output control model, wherein the reactive output control model includes a voltage stabilization module and a regulation module; A first analysis module, configured to use the voltage stabilization module to perform integral transformation on the operating condition parameter to obtain a reactive power variation; A second analysis module is used to perform power regulation processing on the reactive power variation and the given reactive power through the regulation module to obtain reactive power control instructions for each wind turbine in the wind farm to be regulated; The regulating module is used to use each of the reactive power control instructions to regulate the power of the associated wind turbine.

8. An electronic device, characterized in that: It comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the wind farm reactive power control method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the wind farm reactive power control method according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer is enabled to execute the wind farm reactive power control method according to any one of claims 1 to 6.

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