Wind power plant high-voltage fault simulation method, system, equipment and medium

Abstract

The invention discloses a wind power plant high-voltage fault simulation method and system. The method comprises the following steps: constructing a high-voltage fault simulation model to simulate an asymmetric high-voltage fault of a wind power plant; carrying out fault simulation under the condition that the fan controller controls the wind turbine generator to be in a no-load state, obtaining target grid-connected point bus voltage rising data, and determining target asymmetric high-voltage fault parameters of the high-voltage fault simulation model according to the target grid-connected point bus voltage rising data; performing fault simulation under the condition that a fan controller controls a wind turbine generator to be a load, and performing asymmetric high-voltage fault simulation in the high-voltage fault simulation model based on the target asymmetric high-voltage fault parameters; according to the method, the asymmetric high-voltage fault module is simulated when the wind turbine generator is in a no-load state and a load state, and fault parameters can be accurately controlled, so that the test accuracy is improved, the ride-through capability of the wind power plant is comprehensively evaluated, and powerful support is provided for optimal operation, safety and stability of the wind power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy grid-connected performance simulation test, and in particular to a wind farm high voltage fault simulation method, system, equipment and medium. Background Art

[0002] With the access of large-scale wind farms to the power system, a series of major impacts have been brought to the safety and stability of the power system, such as random power changes caused by wind power changes, short-circuit current characteristics during system faults, active and reactive power change characteristics, steady-state reactive power control characteristics, and the impact of large-scale wind power access to the system on the transient, dynamic, and medium- and long-term stability of the power system after replacing the original conventional power supply. In order to meet these challenges, it is necessary to use simulation verification technology in power system analysis to carry out wind farm grid-connected performance evaluation in order to accurately analyze the impact of wind farm access on the power system.

[0003] However, in the prior art, for the simulation of high voltage faults, a method of connecting a negative impedance in parallel on the line is often used to raise the fault phase voltage at the grid connection point. Under the three-phase symmetrical high voltage fault condition, the voltage level and characteristics raised by this setting method are reasonable. However, under the asymmetric high voltage fault condition, this setting method is inconsistent with the actual grid characteristics, which will cause the non-fault phase voltage to far exceed the normal phase voltage, and in severe cases, it will cause the grid protection to malfunction.

[0004] It can be seen that how to reasonably simulate an asymmetric high voltage fault has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The present invention provides a wind farm high voltage fault simulation method, system, device and medium to solve how to reasonably simulate asymmetric high voltage faults, thereby improving the accuracy of wind farm asymmetric high voltage ride-through fault analysis.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a wind farm high voltage fault simulation method, comprising:

[0007] A high voltage fault simulation model is constructed to simulate the asymmetric high voltage fault in the wind farm.

[0008] A fault simulation is performed when the wind turbine controller controls the wind turbine set to be no-loaded to obtain target grid-connected point bus voltage increase data, and target asymmetric high voltage fault parameters of the high voltage fault simulation model are determined based on the target grid-connected point bus voltage increase data.

[0009] A fault simulation is performed when the wind turbine controller controls the wind turbine set to be loaded, and based on the target asymmetric high voltage fault parameter, an asymmetric high voltage fault simulation is performed in the high voltage fault simulation model.

[0010] Furthermore, the high voltage fault simulation model is constructed based on pre-selected data, wherein the data include: parameter data of equivalent power source, parameter data of short-circuit impedance, parameter data of grid connection point bus, parameter data of asymmetric high voltage fault simulation module, parameter data of measurement point, configuration data of box transformer and parameter data of wind turbine.

[0011] Furthermore, the construction of the high voltage fault simulation model further includes:

[0012] In the simulation software, the output end of the wind turbine generator set is connected to the input end of the box transformer, and the output end of the box transformer is connected to the grid connection point bus;

[0013] The asymmetric high voltage fault simulation module is connected in parallel between the grid connection point bus and the measurement point to realize the construction of the high voltage fault simulation model.

[0014] Furthermore, the fault simulation is performed when the wind turbine controller controls the wind turbine set to be no-load, and the target grid-connected point bus voltage increase data is obtained, and the target asymmetric high voltage fault parameters of the high voltage fault simulation model are determined according to the target grid-connected point bus voltage increase data, including:

[0015] When the wind turbine generator set is unloaded, the voltage increase amplitude of the grid-connected point bus is tested to obtain the voltage increase data of the target grid-connected point bus;

[0016] Starting a simulation, setting and adjusting the fault parameters of the asymmetric high voltage on the high voltage fault simulation model, so as to increase the voltage at the busbar of the grid connection point;

[0017] When the voltage at the grid-connected point bus increases to a value corresponding to the target grid-connected point bus voltage increase data, a current fault parameter is determined and used as the target asymmetric high voltage fault parameter.

[0018] Furthermore, the fault simulation is performed when the wind turbine controller controls the wind turbine set to be no-load, including:

[0019] The wind turbine is disconnected from the power grid, and in the high voltage fault simulation model, a signal is triggered to disconnect the three phases of the first circuit breaker and any one or two phases of the second circuit breaker to perform fault simulation under no-load conditions.

[0020] Furthermore, when the wind turbine controller controls the wind turbine set to be loaded, based on the target asymmetric high voltage fault parameter, asymmetric high voltage fault simulation is performed in the high voltage fault simulation model, including:

[0021] At the same time, the trigger signal closes the three phases of the first circuit breaker and the three phases of the second circuit breaker, starts the wind turbine set to be connected to the grid, and adjusts the wind turbine controller to enable the wind turbine set to output rated power;

[0022] In the high voltage fault simulation model, the trigger signal simultaneously disconnects the three phases of the first circuit breaker and any one phase or two phases of the second circuit breaker to perform fault simulation of asymmetric high voltage under load conditions.

[0023] Furthermore, the step of determining the target asymmetric high voltage fault parameter of the high voltage fault simulation model according to the target grid connection point bus voltage increase data includes:

[0024] In the high voltage fault simulation model, based on the target grid-connected point bus voltage rise data and the real-time inductance value under the short-circuit impedance, a target capacitance parameter is obtained, and the target capacitance parameter is expressed by the following formula:

[0025]

[0026] Among them, ω 0 is the angular frequency, L 0 is the real-time inductance, k is the bus voltage increase multiple, and C is the target capacitance;

[0027] The sum of the reactive power of the reactor and the reactive power of the capacitor is set to zero to obtain the target inductance parameter, which is expressed by the following formula:

[0028]

[0029] Among them, ω 0 is the angular frequency, L is the target inductance;

[0030] The target inductance parameter and the target capacitance parameter are used as target asymmetric high voltage fault parameters.

[0031] Another embodiment of the present invention provides a wind farm high voltage fault simulation system, including:

[0032] A simulation model building module, used to build a high voltage fault simulation model to simulate the fault of asymmetric high voltage in a wind farm;

[0033] A parameter determination module is used to perform fault simulation when the wind turbine controller controls the wind turbine set to be no-load, obtain target grid-connected point bus voltage increase data, and determine the target asymmetric high voltage fault parameter of the high voltage fault simulation model according to the target grid-connected point bus voltage increase data;

[0034] The fault simulation module is used to perform fault simulation when the wind turbine controller controls the wind turbine set as a load, and based on the target asymmetric high voltage fault parameters, perform asymmetric high voltage fault simulation in the high voltage fault simulation model.

[0035] Another embodiment of the present invention provides a computer device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the wind farm high voltage fault simulation method as described above when executing the computer program.

[0036] Yet another embodiment of the present invention provides a computer-readable storage medium storing a computer program, wherein when a device where the computer-readable storage medium is located executes the computer program, the wind farm high voltage fault simulation method as described above is implemented.

[0037] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0038] (1) The present invention connects the simulator to the wind turbine controller to simulate the asymmetric high-voltage fault module when the wind turbine is unloaded and loaded, thereby accurately controlling the fault parameters and avoiding various uncertain factors that may be encountered in actual testing, thereby improving the accuracy and repeatability of the test.

[0039] (2) By simulating and analyzing the performance of wind turbines under asymmetric high voltage faults, the control strategy and protection mechanism can be optimized, thereby improving the overall reliability and stability of the wind power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the flow of a wind farm high voltage fault simulation method in one embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the structure of a high voltage fault simulation model in one embodiment of the present invention;

[0042] Figure 3 It is a structural block diagram of a wind farm high voltage fault simulation system in one embodiment of the present invention;

[0043] Figure 4 It is a structural block diagram of a computer device in one embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. 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.

[0045] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0046] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0048] The ride-through capability of a wind farm, especially the ride-through capability in the face of an asymmetric high voltage fault, is an important indicator to ensure the stable operation of the wind farm during a grid fault. By simulating or emulating an asymmetric high voltage fault, the response of the wind farm and its units can be observed intuitively, including the changes in parameters such as voltage, current, and power, so as to evaluate whether the wind farm has sufficient ride-through capability, that is, whether it can maintain grid operation and continue to provide stable power output to the grid during a grid fault.

[0049] An embodiment of the present invention provides a wind farm high voltage fault simulation method, which is not only applicable to electromagnetic transient simulation, but also to electromechanical transient simulation. For details, see Figure 1 , Figure 1 The figure shows a flow chart of a method for simulating a high voltage fault in a wind farm in one embodiment of the present invention, which includes the following steps:

[0050] S1. Build a high voltage fault simulation model to simulate the asymmetric high voltage fault in the wind farm.

[0051] You can use RT-LAB, PSCAD / EMTDC, MATLAB / Simulink and other software and hardware with powerful electromagnetic transient simulation functions for simulation. RT-LAB has powerful real-time simulation and testing capabilities, providing high-precision real-time simulation capabilities, which can ensure the system's rapid response to external events and meet the needs of real-time control and simulation.

[0052] In this embodiment, preferably, a high voltage fault simulation model is established on the RT-LAB real-time simulator software. In some implementations, the high voltage fault simulation model is constructed according to pre-selected data, wherein the data includes: parameter data of equivalent power source, parameter data of short-circuit impedance, parameter data of grid-connected point bus, parameter data of asymmetric high voltage fault simulation module, parameter data of measurement point, configuration data of box transformer and parameter data of wind turbine. Preferably, the high voltage fault simulation model of the embodiment of the present invention includes seven parts: system equivalent power source, system short-circuit impedance, grid-connected point bus, asymmetric high voltage fault simulation module, measurement point, box transformer and wind turbine.

[0053] Specifically, in the process of constructing an equivalent power source, it is necessary to set the corresponding system voltage level and power supply parameters and other parameter data of the equivalent power source. In some embodiments, the voltage amplitude and phase of the equivalent power source are set according to the voltage level of the power system to which the wind farm is connected (such as 110kV, 220kV, etc.), and appropriate power supply impedance parameters are set to ensure consistency with the actual system.

[0054] In the process of constructing the short-circuit impedance, the system short-circuit current and voltage level are used as parameter data of the short-circuit impedance to calculate the specific value of the short-circuit impedance. In the simulation software, resistance and reactance elements can be connected in series to simulate the short-circuit impedance.

[0055] In the process of constructing the grid-connected point bus, it is necessary to set the appropriate bus voltage level and electrical position to construct the grid-connected point bus, wherein the equivalent power source and short-circuit impedance need to be connected to the grid-connected point bus.

[0056] In an embodiment of the present invention, the asymmetric high voltage fault simulation module of the high voltage fault simulation model is formed by setting a reactor, a capacitor, a circuit breaker KL and a circuit breaker KC, and connecting the reactor and the capacitor in parallel between the grid connection point bus and the measuring point through the circuit breaker KL and the circuit breaker KC respectively, so as to form an asymmetric high voltage fault simulation module.

[0057] In the process of setting the measurement points, preferably, the measurement points are set at key locations (such as the grid connection point bus, wind turbine port, etc.), wherein the measurement parameters include key electrical quantities such as voltage, current, and power.

[0058] The box transformer of the model is set according to the actual box transformer configuration of the wind farm. Preferably, corresponding parameters such as rated voltage, transformation ratio and impedance are set as configuration data to construct the box transformer.

[0059] According to the type of wind turbine used in the wind farm (such as fixed-speed wind turbine, double-fed variable-speed wind turbine, etc.), select the appropriate model structure and set the corresponding electrical and control system parameters. The wind turbine model is constructed through the parameter data of the corresponding generator, converter, transformer and other equipment.

[0060] It is worth noting that please refer to Figure 2 , Figure 2 A schematic diagram of the structure of a high voltage fault simulation model in one of the embodiments of the present invention is shown. It can be seen that in the simulation software, it is also necessary to connect the output end of the wind turbine set to the input end of the box transformer, and the output end of the box transformer is connected to the grid-connected point bus, and the asymmetric high voltage fault simulation module is connected in parallel between the grid-connected point bus and the measuring point to realize the construction of the high voltage fault simulation model.

[0061] S2. Perform fault simulation when the wind turbine controller controls the wind turbine set to be no-load, obtain target grid-connected point bus voltage increase data, and determine target asymmetric high voltage fault parameters of the high voltage fault simulation model according to the target grid-connected point bus voltage increase data.

[0062] Before simulation, the wind turbine controller needs to be connected to the RT-LAB real-time simulator, and the voltage and current signals of the measuring point need to be output to the wind turbine controller through the analog interface board, so that the wind turbine controller can return the control pulse to the RT-LAB real-time simulator through the digital input interface board to control the operating status of the wind turbine.

[0063] like Figure 2 As shown, it can be seen that the grid-connected switch B is directly set between the measurement point and the box-type transformer to realize the opening and closing of the grid connection. During the simulation process, it is necessary to run the RT-LAB real-time simulator and disconnect the grid-connected switch B, that is, to perform a no-load test when the wind turbine is disconnected from the grid. The purpose of the no-load test is to measure the voltage at the grid-connected point when the wind turbine is off-grid.

[0064] It can be understood that disconnecting the wind turbine from the power grid can realize system no-load, and then the fault simulation is performed under no-load condition. Specifically: in the high voltage fault simulation model, the trigger signal is simultaneously triggered to disconnect the three phases of the first circuit breaker and any one or two phases of the second circuit breaker to simulate the asymmetric high voltage fault of the grid-connected bus. The first circuit breaker refers to the circuit breaker KL, and the second circuit breaker refers to the circuit breaker KC.

[0065] It is understandable that when the three phases of circuit breaker KL are disconnected at the same time, only the capacitor has an impact on the grid, thereby raising the bus voltage at the grid connection point. At this time, after the three phases of circuit breaker KL are disconnected, one phase of circuit breaker KC is disconnected, and the capacitors on the two phases that are not disconnected will cause the two-phase bus voltage at the grid connection point to increase. At this time, a two-phase asymmetric high voltage fault is simulated, which will have an adverse effect on wind farm equipment and the grid. At this time, attention should be paid to the wind farm control system's ability to identify and respond to asymmetric faults, as well as the power output stability of the wind farm during the fault.

[0066] Similarly, after the three-phase circuit breaker KL is disconnected, two phases of the circuit breaker KC are disconnected, then only the capacitor on the single phase will cause the single-phase bus voltage at the grid connection point to increase. At this time, a single-phase asymmetric high voltage fault is simulated.

[0067] In the above two situations, the focus should be on the high voltage ride-through capability (HVRT) of the wind farm, that is, whether the wind farm can maintain grid-connected operation and continue to provide a certain power output to the grid when the grid voltage increases.

[0068] In this step, when the wind turbine is unloaded, the voltage increase amplitude of the grid-connected point bus is tested to obtain the target grid-connected point bus voltage increase data. The target grid-connected point bus voltage increase data refers to the target voltage increase amplitude (per unit value).

[0069] Preferably, in the embodiment of the present invention, under the two working conditions of high power and low power output of the wind turbine generator set, that is, when the power output of the wind turbine generator set is: P ≥ 90% P n , P n is the rated power (high power output at this time) and the wind turbine power P output is: 10% P n ≤P≤30%P n When the power output is low, the voltage increase at the grid connection point is tested. Specifically, the target voltage increase amplitudes obtained by the test are: 1.2pu, 1.25pu and 1.3pu.

[0070] At this time, start the simulation, set and adjust the fault parameters of the asymmetric high voltage on the high voltage fault simulation model to increase the voltage at the grid-connected point bus. When the voltage increases to the value corresponding to the target grid-connected point bus voltage increase data, determine the current fault parameters and use them as the target asymmetric high voltage fault parameters.

[0071] Specifically, the specific process of obtaining the target asymmetric high voltage fault parameters is described in detail below:

[0072] First, the short-circuit impedance is known to be: Z L0 =ω 0 L 0 , the rated voltage of the equivalent power supply is: U 0 , the current flowing through the system short-circuit impedance can be obtained, which is expressed by the following formula:

[0073]

[0074] Among them, I S is the current, ω 0 is the angular frequency, L 0 is the real-time inductance, that is, the inductance value under the current system short-circuit impedance, and k is the bus voltage increase multiple.

[0075] According to the above formula, the capacitance parameter of the asymmetric high voltage fault simulation module in the high voltage fault simulation model can be further obtained, which can be obtained by the following formula:

[0076]

[0077] Based on the above formula, in the high voltage fault simulation model, the target capacitance parameter is obtained based on the bus voltage increase data of the target grid connection point and the real-time inductance value under the short-circuit impedance. The target capacitance parameter is expressed by the following formula:

[0078]

[0079] Where C is the target capacitance.

[0080] The sum of the reactive power of the reactor and the reactive power of the capacitor is set to zero to obtain the target inductance parameter.

[0081] That is, set the reactive power of the reactor Reactive power of capacitor Q C =-ω 0 ·C·U 2 ,make Where L is the target inductance and U is the effective value of the voltage.

[0082] According to the above formula, we can get:

[0083] Then the target inductance parameter is expressed by the following formula:

[0084]

[0085] Among them, ω 0 is the angular frequency, L is the target inductance;

[0086] Finally, it can be understood that the target inductance parameter and the target capacitance parameter are used as target asymmetric high voltage fault parameters for parameter input of subsequent asymmetric high voltage fault simulation under load conditions.

[0087] S3. When the wind turbine controller controls the wind turbine set as a load, based on the target asymmetric high voltage fault parameter, perform asymmetric high voltage fault simulation in the high voltage fault simulation model.

[0088] According to step S2, under no-load conditions, the asymmetric high voltage fault simulation module of the high voltage fault simulation model is put into operation, that is, the three phases of the circuit breaker KL of the asymmetric high voltage fault simulation module and any one or two phases of the circuit breaker KC are disconnected. Similarly, before the load test, the trigger signal simultaneously closes the three phases of the first circuit breaker and the three phases of the second circuit breaker, and closes the three phases of the grid-connected switch B, starts the wind turbine grid-connected operation, and adjusts the wind turbine controller to enable the wind turbine group to output rated power.

[0089] Then, under load conditions, target asymmetric high voltage fault parameters are set, and the asymmetric high voltage fault simulation module is put into use again. In the high voltage fault simulation model, the three phases of the circuit breaker KL of the asymmetric high voltage fault simulation module and any one or two phases of the circuit breaker KC are disconnected to perform asymmetric high voltage fault simulation. During the simulation process, key operating data such as voltage, current, power, controller output signal, etc. are recorded, and the simulation results are analyzed to accurately evaluate the stability and power output capacity of the wind farm under asymmetric faults, the control system's ability to identify and respond to asymmetric faults, or the wind farm's ability to support grid voltage and frequency, especially during the fault period and after the fault is restored.

[0090] In summary, the embodiment of the present invention performs simulation of asymmetric high voltage under no-load and load conditions, tests the voltage increase at the grid-connected point bus under no-load conditions, adjusts and sets the asymmetric high voltage fault simulation module parameters so that the grid-connected point bus voltage reaches a predetermined target value, thereby determining the asymmetric high voltage fault simulation module parameters. Based on this parameter, asymmetric high voltage simulation is performed under load conditions to comprehensively evaluate the wind farm's ride-through capability and its performance in grid faults, thereby providing strong support for the optimized operation of the wind farm and the safety and stability of the grid.

[0091] An embodiment of the present invention provides a wind farm high voltage fault simulation system. For details, see Figure 3 , Figure 3 The structure block diagram of a wind farm high voltage fault simulation system in one embodiment of the present invention is shown, comprising:

[0092] A simulation model building module M1 is used to build a high voltage fault simulation model to simulate the fault of asymmetric high voltage in a wind farm;

[0093] The parameter determination module M2 is used to perform fault simulation when the wind turbine controller controls the wind turbine set to be no-load, obtain the target grid-connected point bus voltage increase data, and determine the target asymmetric high voltage fault parameter of the high voltage fault simulation model according to the target grid-connected point bus voltage increase data;

[0094] The fault simulation module M3 is used to perform asymmetric high voltage fault simulation in the high voltage fault simulation model based on the target asymmetric high voltage fault parameter when the wind turbine controller controls the wind turbine set as a load.

[0095] like Figure 4 As shown, the embodiment of the present invention further provides a computer device, Figure 4A structural block diagram of a preferred embodiment of a computer device provided by the present invention, the computer device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the wind farm high voltage fault simulation method as described above when executing the computer program.

[0096] Preferably, the computer program can be divided into one or more modules / units (such as computer program 1, computer program 2, ...), and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the computer device.

[0097] The processor may be a central processing unit (CPU), or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor. The processor is the control center of the terminal device, and various parts of the terminal device are connected using various interfaces and lines.

[0098] The memory mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function, etc., and the data storage area can store related data, etc. In addition, the memory can be a high-speed random access memory, or a non-volatile memory, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, and a flash card (Flash Card), etc., or the memory can also be other volatile solid-state storage devices.

[0099] It should be noted that the above terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that Figure 4The structural block diagram is only an example of a terminal device and does not constitute a limitation on the terminal device. It may include more or fewer components than shown in the figure, or combine certain components, or different components. A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium may be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0100] Accordingly, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to perform the steps in the wind farm high voltage fault simulation method of the above embodiment, for example Figure 1 Steps S1 to S3 described in .

[0101] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A wind farm high voltage fault simulation method, characterized in that: include: Construct a high voltage fault simulation model to simulate the asymmetric high voltage fault in wind farms; Perform fault simulation under the condition that the wind turbine controller controls the wind turbine set to be no-load, obtain target grid-connected point bus voltage increase data, and determine the target asymmetric high voltage fault parameters of the high voltage fault simulation model according to the target grid-connected point bus voltage increase data; When the wind turbine controller controls the wind turbine set as a load, an asymmetric high voltage fault simulation is performed in the high voltage fault simulation model based on the target asymmetric high voltage fault parameter.

2. The wind farm high voltage fault simulation method according to claim 1, characterized in that: The high voltage fault simulation model is constructed according to pre-selected data, wherein the data include: parameter data of equivalent power source, parameter data of short-circuit impedance, parameter data of grid connection point bus, parameter data of asymmetric high voltage fault simulation module, parameter data of measurement point, configuration data of box transformer and parameter data of wind turbine.

3. The wind farm high voltage fault simulation method according to claim 2, characterized in that: The constructing of the high voltage fault simulation model further includes: In the simulation software, the output end of the wind turbine generator set is connected to the input end of the box transformer, and the output end of the box transformer is connected to the grid connection point bus; The asymmetric high voltage fault simulation module is connected in parallel between the grid connection point bus and the measurement point to realize the construction of the high voltage fault simulation model.

4. The wind farm high voltage fault simulation method according to claim 2, characterized in that: The fault simulation is performed when the wind turbine controller controls the wind turbine set to be no-load, and the target grid-connected point bus voltage increase data is obtained, and the target asymmetric high voltage fault parameter of the high voltage fault simulation model is determined according to the target grid-connected point bus voltage increase data, including: When the wind turbine generator set is unloaded, the voltage increase amplitude of the grid-connected point bus is tested to obtain the voltage increase data of the target grid-connected point bus; Starting a simulation, setting and adjusting the fault parameters of the asymmetric high voltage on the high voltage fault simulation model, so as to increase the voltage at the busbar of the grid connection point; When the voltage at the grid-connected point bus increases to a value corresponding to the target grid-connected point bus voltage increase data, a current fault parameter is determined and used as the target asymmetric high voltage fault parameter.

5. The wind farm high voltage fault simulation method according to claim 1, characterized in that: The fault simulation is performed when the wind turbine controller controls the wind turbine set to be no-load, including: The wind turbine is disconnected from the power grid, and in the high voltage fault simulation model, a signal is triggered to disconnect the three phases of the first circuit breaker and any one or two phases of the second circuit breaker to perform fault simulation under no-load conditions.

6. The wind farm high voltage fault simulation method according to claim 5, characterized in that: When the wind turbine controller controls the wind turbine set to be loaded, based on the target asymmetric high voltage fault parameter, performing asymmetric high voltage fault simulation in the high voltage fault simulation model includes: At the same time, the trigger signal closes the three phases of the first circuit breaker and the three phases of the second circuit breaker, starts the wind turbine set to be connected to the grid, and adjusts the wind turbine controller to enable the wind turbine set to output rated power; In the high voltage fault simulation model, the trigger signal simultaneously disconnects the three phases of the first circuit breaker and any one phase or two phases of the second circuit breaker to perform fault simulation of asymmetric high voltage under load conditions.

7. The wind farm high voltage fault simulation method according to claim 2, characterized in that: The step of determining the target asymmetric high voltage fault parameter of the high voltage fault simulation model according to the target grid connection point bus voltage increase data includes: In the high voltage fault simulation model, based on the target grid-connected point bus voltage rise data and the real-time inductance value under the short-circuit impedance, a target capacitance parameter is obtained, and the target capacitance parameter is expressed by the following formula: Among them, ω0 is the angular frequency, L0 is the real-time inductance, k is the bus voltage increase multiple, and C is the target capacitance; The sum of the reactive power of the reactor and the reactive power of the capacitor is set to zero to obtain the target inductance parameter, which is expressed by the following formula: Where ω0 is the angular frequency and L is the target inductance; The target inductance parameter and the target capacitance parameter are used as target asymmetric high voltage fault parameters.

8. A wind farm high voltage fault simulation system, characterized in that: include: A simulation model building module, used to build a high voltage fault simulation model to simulate the fault of asymmetric high voltage in a wind farm; A parameter determination module is used to perform fault simulation when the wind turbine controller controls the wind turbine set to be no-load, obtain target grid-connected point bus voltage increase data, and determine the target asymmetric high voltage fault parameter of the high voltage fault simulation model according to the target grid-connected point bus voltage increase data; The fault simulation module is used to perform asymmetric high voltage fault simulation in the high voltage fault simulation model based on the target asymmetric high voltage fault parameter when the wind turbine controller controls the wind turbine set as a load.

9. A computer device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the wind farm high voltage fault simulation method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the wind farm high voltage fault simulation method according to any one of claims 1 to 7 is implemented.

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