A reactive voltage control method and system for rapidly suppressing transient voltage

Abstract

The present invention proposes a reactive voltage control method and system for rapidly suppressing transient voltage, the method comprising: the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbine group, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device; the reactive compensation device performs reactive adjustment according to the voltage command, tracks and controls the grid connection point voltage, and adjusts and suppresses when transient voltage occurs; the wind turbine group performs reactive adjustment according to the reactive command, performs reactive replacement of the reactive compensation device during the reactive adjustment process of the wind turbine group, and maintains a certain reactive margin of the reactive compensation device. The method and system can ensure that the wind farm has the tracking and adjustment capability in steady state, and can also perform rapid tracking and adjustment when transient fluctuations occur in the system voltage, so as to stabilize the grid voltage.

Description

Technical Field

[0001] The present invention relates to the field of power control, and in particular to a reactive voltage control method and system for rapidly suppressing transient voltage. Background Art

[0002] With the depletion of fossil energy and the increasing pressure on environmental protection, people are increasingly thirsting for clean and sustainable energy. Wind power, with its mature technology and abundant resources, has a priority position in the development of clean energy. With the leapfrog development of wind power, the contradiction between the explosive growth of wind power installed capacity and the safety and stability of grid voltage has become increasingly prominent.

[0003] In order to deal with the voltage safety issues of large-scale wind power access, each wind farm is equipped with a reactive voltage control system (AVC, Auto Voltage Control) and a dynamic reactive compensation device (SVG) to improve and coordinate voltage stability. In order to ensure the stability of the voltage at the wind farm grid connection point, the wind farm AVC system adjusts the reactive power of the reactive compensation device and the wind turbine in the station to achieve stable voltage operation at the grid connection point. Wind farms generally operate at the end of the power grid, the grid system is relatively weak, the voltage fluctuation amplitude is large, and the voltage stability is relatively poor. In addition, the wind farm AVC system regulates and controls reactive power through periodic instructions. When the system voltage fluctuates within the AVC regulation cycle, the AVC system cannot be adjusted in time, and it is necessary to wait until the next control cycle to adjust the reactive power and issue instructions. This control strategy can achieve stable operation of the grid connection point voltage in steady state, but it cannot quickly track and adjust the voltage when the system fluctuates.

[0004] In summary, there is an urgent need for a technical solution that can ensure rapid regulation and control of wind farms in a steady state, and can also achieve rapid tracking and regulation when transient fluctuations occur in the system voltage. Summary of the invention

[0005] In order to overcome the problems existing in the prior art, the present invention proposes a reactive voltage control method and system for rapidly suppressing transient voltage. In this method and system, the wind farm AVC sends the required reactive power instructions to the wind turbines during steady-state control, and at the same time calculates the voltage instruction that the reactive compensation device should adjust (with the voltage on the low-voltage side of the main transformer as the control target) and sends it to the reactive compensation device. The reactive compensation device quickly implements reactive power tracking control according to the voltage instruction, and then implements reactive power replacement through reactive power tracking and adjustment of the wind turbines. When the system experiences voltage fluctuations, the reactive compensation device can quickly suppress voltage fluctuations in the constant voltage control mode, thereby stabilizing the grid voltage. This method not only ensures rapid adjustment and control of the wind farm in steady state, but also realizes rapid tracking and adjustment when transient fluctuations occur in the system voltage.

[0006] In a first aspect of an embodiment of the present invention, a reactive voltage control method for rapidly suppressing transient voltage is proposed, the method comprising:

[0007] The wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value on the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device;

[0008] The reactive power compensation device performs reactive power regulation according to the voltage command, tracks and controls the grid connection point voltage, and regulates and suppresses transient voltage when it occurs;

[0009] The wind turbine set performs reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and performs reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine set to maintain a certain reactive power margin of the reactive power compensation device.

[0010] Furthermore, the method also includes:

[0011] After the wind farm AVC receives the target voltage command value, the reactive voltage sensitivity coefficient of the wind farm is calculated, where the calculation formula of the reactive voltage sensitivity coefficient is:

[0012]

[0013] Among them, X1 and X2 are process variables, U1 is the grid-connected point voltage measurement value at the previous moment, Q1 is the grid-connected point reactive power measurement value at the previous moment, U2 is the grid-connected point voltage measurement value at the current moment, Q2 is the grid-connected point reactive power measurement value at the current moment, and Z is the reactive voltage sensitivity coefficient.

[0014] Furthermore, the reactive voltage sensitivity coefficient of the wind farm is calculated through periodic circulation, and the average value of data within four hours is selected as the current reactive voltage sensitivity coefficient.

[0015] Furthermore, the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbine generator, including:

[0016] The calculation formula for the reactive power to be adjusted by the wind farm is:

[0017] Q ref =(U after -U befor )×Z;

[0018] Among them, U after is the target voltage command value received by the wind farm AVC, U berefis the current voltage value of the wind farm, Q ref The reactive power to be adjusted by the calculated wind farm is sent to the wind turbines.

[0019] Furthermore, the wind farm AVC calculates the voltage value of the low-voltage side of the main transformer of the reactive power compensation device according to the main transformer parameters of the wind farm, generates a voltage instruction and sends it to the reactive power compensation device, including:

[0020] According to the reactive voltage sensitivity coefficient of the wind farm, the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is calculated, and the voltage command is sent to the reactive compensation device for tracking and controlling the voltage target command; wherein, the calculation formula of the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is:

[0021] U ref =(U after ×(1-1 / Z)) / R;

[0022] Among them, U after is the target voltage command value received by the wind farm AVC, Z is the reactive voltage sensitivity coefficient, R is the voltage transformation ratio between the high-voltage side and the low-voltage side of the main transformer of the wind farm, and U ref It is the voltage command value of the low-voltage side of the main transformer of the reactive power compensation device.

[0023] Furthermore, the method also includes:

[0024] The control parameters of the voltage control mode of the reactive compensation device are set; wherein, the voltage slope coefficient of the reactive compensation device is adjusted according to the current reactive voltage sensitivity coefficient; when the sensitivity coefficient is less than 10, the voltage slope coefficient of the reactive compensation device is set to 0.1%-1%; when the sensitivity coefficient is greater than 10, the voltage slope coefficient of the reactive compensation device is set to 1%-10%.

[0025] Furthermore, the low-voltage side of the main transformer of the wind farm includes at least two sets of reactive compensation devices; among them, one set of reactive compensation devices is set to the constant voltage control mode of the low-voltage side of the main transformer, and is used to receive the voltage command issued by the wind farm AVC, and the other reactive compensation devices are set to the reactive control mode, and are used to receive the reactive power command issued by the wind farm AVC.

[0026] In a second aspect of the embodiment of the present invention, a reactive voltage control system for rapidly suppressing transient voltage is proposed, the system comprising: a wind farm AVC, a reactive compensation device and a wind turbine generator set; wherein:

[0027] The wind farm AVC is used to calculate the reactive power to be adjusted by the wind farm according to the received target voltage command, generate a reactive power command and send it to the wind turbines, and calculate the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generate a voltage command and send it to the reactive compensation device;

[0028] The reactive power compensation device is used to perform reactive power regulation according to the voltage command, track and control the grid connection point voltage, and regulate and suppress transient voltage when it occurs;

[0029] The wind turbine set is used to perform reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and to perform reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine set, so as to maintain a certain reactive power margin of the reactive power compensation device.

[0030] In a third aspect of an embodiment of the present invention, a computer device is proposed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a reactive voltage control method for rapidly suppressing transient voltage when executing the computer program.

[0031] In a fourth aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a reactive voltage control method for rapidly suppressing transient voltage is implemented.

[0032] The reactive voltage control method and system for rapidly suppressing transient voltage proposed by the present invention, the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbine group, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device; the reactive compensation device performs reactive adjustment according to the voltage command, tracks and controls the grid connection point voltage, and adjusts and suppresses when transient voltage occurs; the wind turbine group performs reactive adjustment according to the reactive command issued by the wind farm AVC, and replaces the reactive power of the reactive compensation device during the reactive adjustment process of the wind turbine group, so as to maintain a certain reactive margin of the reactive compensation device. When voltage fluctuation occurs in the power grid system, the reactive compensation device can be used to rapidly suppress voltage fluctuation in the constant voltage control mode, so as to stabilize the power grid voltage, avoid the problem that the conventional wind farm AVC control strategy cannot rapidly track and respond to voltage fluctuation, and enables the wind farm to have the tracking and adjustment capability in steady state and the rapid tracking and adjustment capability when transient fluctuation occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 The figure is a flow chart of a reactive voltage control method for rapidly suppressing transient voltage according to an embodiment of the present invention.

[0035] Figure 2 The figure is a schematic diagram of a calculation process of reactive power and voltage value according to an embodiment of the present invention.

[0036] Figure 3 It is a schematic diagram of the architecture of a reactive voltage control system for rapidly suppressing transient voltage according to an embodiment of the present invention.

[0037] Figure 4 It is a schematic diagram of the structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] Those skilled in the art will appreciate that the embodiments of the present invention may be implemented as a system, device, apparatus, method or computer program product. Therefore, the present disclosure may be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0040] According to an embodiment of the present invention, a reactive voltage control method and system for rapidly suppressing transient voltage are proposed. By using the method and system, the wind farm can have the ability to track and adjust in steady state and the ability to quickly track and adjust voltage in transient state, avoiding the problem of being unable to quickly track and respond to voltage fluctuations under the AVC control strategy of conventional wind farms. At the same time, different control parameter setting methods can be provided for the problem of different reactive voltage sensitivities of different wind farm access systems, which are more adaptable to different systems. In addition, for wind farms with multiple reactive compensation devices, differentiated reactive compensation device control modes are proposed. By combining the constant voltage control mode of the reactive compensation device with the reactive control mode, the rapid tracking control of the voltage is guaranteed, and the reactive reverse regulation and oscillation of multiple reactive compensation devices in the constant voltage control mode are avoided.

[0041] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0042] Figure 1 FIG. 1 is a flow chart of a reactive voltage control method for rapidly suppressing transient voltage according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0043] Step S1, the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device;

[0044] Step S2, the reactive power compensation device performs reactive power regulation according to the voltage command, tracks and controls the grid connection point voltage, and regulates and suppresses transient voltage when it occurs;

[0045] Step S3, the wind turbine set performs reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and performs reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine set to maintain a certain reactive power margin of the reactive power compensation device.

[0046] Based on the above control method, the reactive power compensation device can quickly track and control the voltage fluctuations that occur, and immediately adjust and suppress the transient voltage when it occurs, without waiting for the control cycle; when the wind turbine performs reactive power adjustment, the reactive power compensation device will be replaced with reactive power to ensure that the reactive power device always retains sufficient reactive power margin to cope with the next voltage fluctuation.

[0047] In order to explain the reactive voltage control method for rapidly suppressing transient voltage more clearly, each step is described in detail below.

[0048] In step S1, the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value on the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device.

[0049] refer to Figure 2 , the specific calculation process of reactive power and voltage value is:

[0050] Step S101: after the wind farm AVC receives the target voltage command value, the reactive voltage sensitivity coefficient of the wind farm is calculated, wherein the calculation formula of the reactive voltage sensitivity coefficient is:

[0051]

[0052] Among them, X1 and X2 are process variables, U1 is the grid-connected point voltage measurement value at the previous moment, Q1 is the grid-connected point reactive power measurement value at the previous moment, U2 is the grid-connected point voltage measurement value at the current moment, Q2 is the grid-connected point reactive power measurement value at the current moment, and Z is the reactive voltage sensitivity coefficient.

[0053] In this embodiment, the reactive voltage sensitivity coefficient of the wind farm is calculated periodically, and the average value of data within four hours is selected as the current reactive voltage sensitivity coefficient to avoid large fluctuations in numerical calculation caused by sudden fluctuations in the system and ensure the accuracy of the numerical value.

[0054] Step S102: The wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines.

[0055] The calculation formula for the reactive power to be adjusted by the wind farm is:

[0056] Q ref =(U after -U befor )×Z;

[0057] Among them, U after is the target voltage command value received by the wind farm AVC, U beref is the current voltage value of the wind farm, Q ref The reactive power to be adjusted by the calculated wind farm is sent to the wind turbines.

[0058] Step S103, according to the reactive voltage sensitivity coefficient of the wind farm, the voltage command value of the low-voltage side of the main transformer of the reactive compensation device is calculated, and the voltage command is sent to the reactive compensation device for tracking control of the voltage target command; wherein the calculation formula of the voltage command value of the low-voltage side of the main transformer of the reactive compensation device is:

[0059] U ref =(U after ×(1-1 / Z)) / R;

[0060] Among them, U after is the target voltage command value received by the wind farm AVC, Z is the reactive voltage sensitivity coefficient, R is the voltage transformation ratio between the high-voltage side and the low-voltage side of the main transformer of the wind farm, and U ref It is the voltage command value of the low-voltage side of the main transformer of the reactive power compensation device.

[0061] Step S2, the reactive power compensation device performs reactive power regulation according to the voltage command, tracks and controls the grid connection point voltage, and regulates and suppresses transient voltage when it occurs;

[0062] Step S3, the wind turbine set performs reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and performs reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine set to maintain a certain reactive power margin of the reactive power compensation device.

[0063] In this embodiment, the method further includes:

[0064] The control parameters of the voltage control mode of the reactive compensation device are set; specifically, when the reactive compensation device and the wind turbine set perform reactive voltage regulation, the regulation speed of the reactive compensation device in the constant voltage mode is faster than the reactive power regulation speed of the wind turbine set. To ensure the smooth reactive regulation of the reactive compensation device and the wind turbine set, the voltage slope coefficient of the reactive compensation device is adjusted according to the current reactive voltage sensitivity coefficient; wherein, when the sensitivity coefficient is less than 10, the voltage slope coefficient of the reactive compensation device is set to 0.1%-1%; when the sensitivity coefficient is greater than 10, the voltage slope coefficient of the reactive compensation device is set to 1%-10%.

[0065] In this embodiment, reference Figure 3 The figure shows a schematic diagram of the architecture of a reactive voltage control system for rapidly suppressing transient voltage according to a specific embodiment of the present invention. The low-voltage side of the main transformer of the wind farm includes at least two sets of reactive compensation devices; one set of reactive compensation devices is set to a constant voltage control mode of the low-voltage side of the main transformer, and is used to receive voltage instructions issued by the wind farm AVC, and the other reactive compensation devices are set to a reactive control mode, and are used to receive reactive power instructions issued by the wind farm AVC.

[0066] The existing technical solutions all use the wind farm AVC control system to send reactive power instructions to wind turbines and reactive compensation devices. In steady state, the tracking control of the grid connection point voltage can be achieved. However, when the system voltage fluctuates, the tracking control cannot be achieved quickly. Therefore, the reactive voltage control method for rapidly suppressing transient voltage proposed in the present invention has at least the following advantages compared with the existing technology:

[0067] 1. The wind farm has the ability to track and regulate in steady state and the ability to quickly track and regulate voltage in transient state, avoiding the problem of being unable to quickly track and respond to voltage fluctuations under the conventional wind farm AVC control strategy.

[0068] 2. Aiming at the problem of different reactive voltage sensitivity of different wind farm access systems, different control parameter setting methods are given, which are more adaptable to different systems.

[0069] 3. For wind farms with multiple reactive compensation devices, a differentiated reactive compensation device control mode is proposed. By combining the constant voltage control mode of the reactive compensation device with the reactive control mode, it not only ensures the rapid tracking control of the voltage, but also avoids the reactive back-regulation and oscillation of multiple reactive compensation devices in the constant voltage control mode.

[0070] It should be noted that, although the operations of the method of the present invention are described in a specific order in the above embodiments and the accompanying drawings, this does not require or imply that the operations must be performed in the specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0071] After introducing the method of the exemplary embodiment of the present invention, next, refer to Figure 3 A reactive voltage control system for rapidly suppressing transient voltage according to an exemplary embodiment of the present invention is introduced.

[0072] The implementation of the reactive voltage control system for rapidly suppressing transient voltage can refer to the implementation of the above method, and the repeated parts will not be repeated. The term "module" or "unit" used below can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0073] Based on the same inventive concept, the present invention also proposes a reactive voltage control system for rapidly suppressing transient voltage, such as Figure 3 As shown, the system includes: wind farm AVC, reactive power compensation device and wind turbine; wherein,

[0074] The wind farm AVC is used to calculate the reactive power to be adjusted by the wind farm according to the received target voltage command, generate a reactive power command and send it to the wind turbines, and calculate the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generate a voltage command and send it to the reactive compensation device;

[0075] The reactive power compensation device is used to perform reactive power regulation according to the voltage command, track and control the grid connection point voltage, and regulate and suppress transient voltage when it occurs;

[0076] The wind turbine set is used to perform reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and to perform reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine set, so as to maintain a certain reactive power margin of the reactive power compensation device.

[0077] Among them, the low-voltage side of the main transformer of the wind farm includes at least two sets of reactive compensation devices; among them, one set of reactive compensation devices is set to the constant voltage control mode of the low-voltage side of the main transformer, used to receive the voltage command issued by the wind farm AVC, and the other reactive compensation devices are set to the reactive control mode, used to receive the reactive power command issued by the wind farm AVC.

[0078] It should be noted that, although several modules of the reactive voltage control system for rapidly suppressing transient voltage are mentioned in the above detailed description, such division is merely exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more modules described above may be embodied in one module. Conversely, the features and functions of one module described above may be further divided into multiple modules for embodiment.

[0079] Based on the above invention concept, Figure 4 As shown, the present invention also proposes a computer device 400, including a memory 410, a processor 420, and a computer program 430 stored in the memory 410 and executable on the processor 420, wherein the processor 420 implements the aforementioned reactive voltage control method for rapidly suppressing transient voltage when executing the computer program 430.

[0080] Based on the aforementioned inventive concept, the present invention proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the reactive voltage control method for rapidly suppressing transient voltage is implemented.

[0081] The reactive voltage control method and system for rapidly suppressing transient voltage proposed by the present invention, the wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbine group, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device; the reactive compensation device performs reactive adjustment according to the voltage command, tracks and controls the grid connection point voltage, and adjusts and suppresses when transient voltage occurs; the wind turbine group performs reactive adjustment according to the reactive command issued by the wind farm AVC, and replaces the reactive power of the reactive compensation device during the reactive adjustment process of the wind turbine group, so as to maintain a certain reactive margin of the reactive compensation device. When voltage fluctuation occurs in the power grid system, the reactive compensation device can be used to rapidly suppress voltage fluctuation in the constant voltage control mode, so as to stabilize the power grid voltage, avoid the problem that the conventional wind farm AVC control strategy cannot rapidly track and respond to voltage fluctuation, and enables the wind farm to have the tracking and adjustment capability in steady state and the rapid tracking and adjustment capability when transient fluctuation occurs.

[0082] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0086] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A reactive voltage control method for rapidly suppressing transient voltage, characterized in that: The method includes: The wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value on the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device; The reactive power compensation device performs reactive power regulation according to the voltage command, tracks and controls the grid connection point voltage, and regulates and suppresses transient voltage when it occurs; The wind turbine sets perform reactive power regulation according to the reactive power command issued by the wind farm AVC, and perform reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine sets, so as to maintain a certain reactive power margin of the reactive power compensation device; The method further comprises: After the wind farm AVC receives the target voltage command value, the reactive voltage sensitivity coefficient of the wind farm is calculated, where the calculation formula of the reactive voltage sensitivity coefficient is: Among them, X1 and X2 are process variables, U1 is the grid connection point voltage measurement value at the previous moment, Q1 is the grid connection point reactive power measurement value at the previous moment, U2 is the grid connection point voltage measurement value at the current moment, Q2 is the grid connection point reactive power measurement value at the current moment, and Z is the reactive voltage sensitivity coefficient; The wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device, including: The calculation formula for the reactive power to be adjusted by the wind farm is: Q ref =(U after -U befor )×Z; Among them, U after is the target voltage command value received by the wind farm AVC, U beref is the current voltage value of the wind farm, Q ref The reactive power to be adjusted for the calculated wind farm is sent to the wind turbines; According to the reactive voltage sensitivity coefficient of the wind farm, the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is calculated, and the voltage command is sent to the reactive compensation device for tracking and controlling the voltage target command; wherein, the calculation formula of the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is: U ref =(U after ×(1-1 / Z)) / R; Among them, U after is the target voltage command value received by the wind farm AVC, Z is the reactive voltage sensitivity coefficient, R is the voltage transformation ratio between the high-voltage side and the low-voltage side of the main transformer of the wind farm, and U ref It is the voltage command value of the low-voltage side of the main transformer of the reactive power compensation device; The control parameters of the voltage control mode of the reactive compensation device are set; wherein, the voltage slope coefficient of the reactive compensation device is adjusted according to the current reactive voltage sensitivity coefficient; when the sensitivity coefficient is less than 10, the voltage slope coefficient of the reactive compensation device is set to 0.1%-1%; when the sensitivity coefficient is greater than 10, the voltage slope coefficient of the reactive compensation device is set to 1%-10%.

2. The method according to claim 1, characterized in that The reactive voltage sensitivity coefficient of the wind farm is calculated periodically, and the average value of data within four hours is selected as the current reactive voltage sensitivity coefficient.

3. The method according to claim 1, characterized in that The low-voltage side of the main transformer of the wind farm includes at least two sets of reactive compensation devices; among them, one set of reactive compensation devices is set to the constant voltage control mode of the low-voltage side of the main transformer, used to receive the voltage command issued by the wind farm AVC, and the other reactive compensation devices are set to the reactive control mode, used to receive the reactive power command issued by the wind farm AVC.

4. A reactive voltage control system for rapidly suppressing transient voltage, characterized in that: The system includes: wind farm AVC, reactive power compensation device and wind turbine; among which, The wind farm AVC is used to calculate the reactive power to be adjusted by the wind farm according to the received target voltage command, generate a reactive power command and send it to the wind turbines, and calculate the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generate a voltage command and send it to the reactive compensation device; The reactive power compensation device is used to perform reactive power regulation according to the voltage command, track and control the grid connection point voltage, and regulate and suppress transient voltage when it occurs; The wind turbine generator set is used to perform reactive power regulation according to the reactive power instruction issued by the wind farm AVC, and to perform reactive power replacement of the reactive power compensation device during the reactive power regulation process of the wind turbine generator set, so as to maintain a certain reactive power margin of the reactive power compensation device; After the wind farm AVC receives the target voltage command value, the reactive voltage sensitivity coefficient of the wind farm is calculated, wherein the calculation formula of the reactive voltage sensitivity coefficient is: Among them, X1 and X2 are process variables, U1 is the grid connection point voltage measurement value at the previous moment, Q1 is the grid connection point reactive power measurement value at the previous moment, U2 is the grid connection point voltage measurement value at the current moment, Q2 is the grid connection point reactive power measurement value at the current moment, and Z is the reactive voltage sensitivity coefficient; The wind farm AVC calculates the reactive power to be adjusted by the wind farm according to the received target voltage command, generates a reactive power command and sends it to the wind turbines, and calculates the voltage value of the low-voltage side of the main transformer of the reactive compensation device according to the main transformer parameters of the wind farm, generates a voltage command and sends it to the reactive compensation device, including: The calculation formula for the reactive power to be adjusted by the wind farm is: Q ref =(U after -U befor )×Z; Among them, U after is the target voltage command value received by the wind farm AVC, U beref is the current voltage value of the wind farm, Q ref The reactive power to be adjusted for the calculated wind farm is sent to the wind turbines; According to the reactive voltage sensitivity coefficient of the wind farm, the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is calculated, and the voltage command is sent to the reactive compensation device for tracking and controlling the voltage target command; wherein, the calculation formula of the voltage command value on the low-voltage side of the main transformer of the reactive compensation device is: U ref =(U after ×(1-1 / Z)) / R; Among them, U after is the target voltage command value received by the wind farm AVC, Z is the reactive voltage sensitivity coefficient, R is the voltage transformation ratio between the high-voltage side and the low-voltage side of the main transformer of the wind farm, and U ref It is the voltage command value of the low-voltage side of the main transformer of the reactive power compensation device; The control parameters of the voltage control mode of the reactive compensation device are set; wherein, the voltage slope coefficient of the reactive compensation device is adjusted according to the current reactive voltage sensitivity coefficient; when the sensitivity coefficient is less than 10, the voltage slope coefficient of the reactive compensation device is set to 0.1%-1%; when the sensitivity coefficient is greater than 10, the voltage slope coefficient of the reactive compensation device is set to 1%-10%.

5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 3 is implemented.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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