Power-control hardware-in-loop combined wind power integration test system and method

Abstract

The invention discloses a power-control hardware-in-loop combined wind power grid-connected test system and method, and the system comprises a power grid subsystem which is used for carrying out the real-time simulation of a power grid, outputting the voltage of a grid-connected node of a wind turbine generator, and transmitting the voltage as a voltage reference value to a power grid simulation device subsystem; the power grid simulation device subsystem is used for carrying out real-time simulation on a power grid simulation device and controlling the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value; and the tested wind turbine generator subsystem is used for performing real-time simulation on the tested wind turbine generator and outputting feedback current to the power grid subsystem based on the grid-connected voltage. A controller hardware-in-the-loop mode is adopted, the system and functions of the wind turbine generator power hardware-in-the-loop grid-connected test are achieved, the development speed of the wind turbine generator power hardware-in-the-loop grid-connected test can be increased, and development and application safety risks of a high-voltage and high-power hardware-in-the-loop test system are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy grid connection, and more specifically, to a wind power grid connection test system and method combining power and control hardware in the loop. Background Art

[0002] At present, in order to verify the operating characteristics of wind turbines after they are connected to the power grid system, a wind power grid-connected test method based on power hardware in the loop can be used. Among them, the power grid system to which the wind turbine is connected is simulated by a real-time simulation method. The real-time simulation subsystem of the power grid sends the voltage reference signal of the wind turbine grid connection point to the power amplifier device, and the power amplifier device amplifies the voltage reference signal to a voltage level that can be used for the actual wind turbine to be connected to the grid. After the wind turbine to be tested is connected to the power amplifier device, the output current of the unit is sampled and fed back to the real-time simulation subsystem of the power grid, thereby completing the closed loop and forming an equivalent operating environment for the wind turbine to be connected to the power grid, so as to carry out the wind turbine grid-connected characteristic test. However, the above-mentioned power hardware in the loop system is difficult to develop, and due to the high voltage and power levels, there are great safety risks. Its research and development and application are quite challenging and are rarely used at present.

[0003] Therefore, a wind power grid-connected test system combining power and control hardware in the loop is needed. Summary of the invention

[0004] The present invention provides a wind power grid-connected test system and method combining power and control hardware in the loop, so as to solve the problem of how to test the wind power grid-connected characteristics.

[0005] In order to solve the above problems, according to one aspect of the present invention, a wind power grid-connected test system combining power and control hardware in the loop is provided, the system comprising:

[0006] The power grid subsystem is used to simulate the power grid in real time, output the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device subsystem as a voltage reference value;

[0007] A power grid simulation device subsystem, used for simulating the power grid simulation device in real time, and controlling the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value;

[0008] The wind turbine generator set subsystem under test is used to perform real-time simulation on the wind turbine generator set under test and output feedback current to the power grid subsystem based on the grid-connected voltage.

[0009] Preferably, the power grid subsystem comprises:

[0010] A power grid operation control module, used to generate a first control instruction based on the first operation status information sent by the power grid real-time simulation module, and send the first control instruction to the power grid real-time simulation module;

[0011] The real-time power grid simulation module is used to simulate the primary topology of the power grid in real time based on the first control instruction, and obtain the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device operation control module as a voltage reference value.

[0012] Preferably, the power grid simulation device subsystem comprises:

[0013] A power grid simulation device operation control module, used to generate a second control instruction based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, and send the second control instruction to the power grid simulation device real-time simulation module;

[0014] The real-time simulation module of the power grid simulation device is used to simulate the primary circuit of the power grid simulation device in real time based on the second control instruction and output the required grid-connected voltage.

[0015] Preferably, the wind turbine generator subsystem under test comprises:

[0016] The wind turbine unit under test operation control module is used to generate a third control instruction based on the third operation status information sent by the real-time simulation module of the wind turbine unit under test, and send the third control instruction to the real-time simulation module of the wind turbine unit under test,

[0017] The real-time simulation module of the wind turbine under test is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and output feedback current to the real-time simulation module of the power grid based on the grid-connected voltage.

[0018] Preferably, the operation control module of the wind turbine set under test is further used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be grid-connected.

[0019] According to another aspect of the present invention, a test method of a wind power grid-connected test system based on the power-control hardware-in-the-loop combination as described above is provided, the method comprising:

[0020] The power grid subsystem is used to simulate the power grid in real time, output the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device subsystem as a voltage reference value;

[0021] Using the power grid simulation device subsystem to perform real-time simulation on the power grid simulation device, and outputting the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value;

[0022] The wind turbine generator set under test is simulated in real time using the wind turbine generator set under test subsystem, and a feedback current is output to the power grid subsystem based on the grid-connected voltage.

[0023] Preferably, the power grid subsystem is used to simulate the power grid in real time, output the node voltage of the wind turbine generator set connected to the grid, and send it to the power grid simulation device subsystem as a voltage reference value, including:

[0024] Using the power grid operation control module in the power grid subsystem, a first control instruction is generated based on the first operation status information sent by the power grid real-time simulation module, and sent to the power grid real-time simulation module;

[0025] The real-time grid simulation module in the grid subsystem is used to simulate the primary topology of the grid in real time based on the first control instruction, and the grid-connected node voltage of the wind turbine is obtained and sent to the grid simulation device operation control module as a voltage reference value.

[0026] Preferably, the power grid simulation device is simulated in real time by using the power grid simulation device subsystem, and the grid-connected voltage required by the primary circuit output of the power grid simulation device is controlled based on the node voltage reference value, including:

[0027] Using the power grid simulation device operation control module in the power grid simulation device subsystem, based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, a second control instruction is generated and sent to the power grid simulation device real-time simulation module;

[0028] The real-time simulation module of the power grid simulation device in the power grid simulation device subsystem is used to perform real-time simulation of the primary circuit of the power grid simulation device based on the second control instruction to output the required grid-connected voltage.

[0029] Preferably, the method of using the wind turbine subsystem to simulate the wind turbine subsystem in real time and outputting feedback current to the grid subsystem based on the grid-connected voltage includes:

[0030] Using the tested wind turbine operation control module in the tested wind turbine subsystem, a third control instruction is generated based on the third operation status information sent by the tested wind turbine real-time simulation module, and sent to the tested wind turbine real-time simulation module,

[0031] The real-time simulation module of the wind turbine under test in the wind turbine under test subsystem is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and the feedback current is output to the grid real-time simulation module based on the grid-connected voltage.

[0032] Preferably, the method further comprises:

[0033] The operation control module of the wind turbine set under test is used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be grid-connected.

[0034] The present invention provides a wind power grid-connected test system and method combining power-control hardware in the loop, including: a power grid subsystem, used for real-time simulation of the power grid, outputting the node voltage of the wind turbine grid-connected, and sending it to the power grid simulation device subsystem as a voltage reference value; a power grid simulation device subsystem, used for real-time simulation of the power grid simulation device, and controlling the grid-connected voltage required by the primary circuit of the power grid simulation device output based on the node voltage reference value; a tested wind turbine subsystem, used for real-time simulation of the tested wind turbine, and outputting feedback current to the power grid subsystem based on the grid-connected voltage. The present invention adopts the controller hardware in the loop to realize the system and function of the wind turbine power hardware in the loop grid-connected test, which can speed up the development speed of the wind turbine power hardware in the loop grid-connected test, reduce the development and application safety risks of high-voltage and high-power power hardware in the loop test system, and test and test the grid-connected operation characteristics of the tested wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0036] Figure 1 It is a structural schematic diagram of a wind power grid-connected test system 100 combining power and control hardware in the loop according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the interaction of a wind power grid-connected test system combining power and control hardware-in-the-loop according to an embodiment of the present invention;

[0038] Figure 3 An exemplary diagram of a wind power grid-connected test system combining power and control hardware in the loop according to an embodiment of the present invention;

[0039] Figure 4 Flow chart of a wind power grid-connected test method 400 combining power and control hardware-in-the-loop according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0041] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0042] Figure 1 FIG. 1 is a schematic diagram of a wind power grid-connected test system 100 combining power and control hardware in the loop according to an embodiment of the present invention. Figure 1 As shown, the wind power grid-connected test system combining power and control hardware in the loop provided by the embodiment of the present invention adopts the controller hardware in the loop to realize the system and function of the wind turbine power hardware in the loop grid-connected test, which can speed up the development speed of the wind turbine power hardware in the loop grid-connected test, reduce the development and application safety risks of high-voltage and high-power power hardware in the loop test system, and test and test the grid-connected operation characteristics of the tested wind turbine. The wind power grid-connected test system 100 combining power and control hardware in the loop provided by the embodiment of the present invention includes: a power grid subsystem 101, a power grid simulation device subsystem 102 and a tested wind turbine subsystem 103.

[0043] Preferably, the power grid subsystem 101 is used to simulate the power grid in real time, output the node voltage of the wind turbine connected to the grid, and send it to the power grid simulation device subsystem as a voltage reference value.

[0044] Preferably, the power grid subsystem comprises:

[0045] A power grid operation control module, used to generate a first control instruction based on the first operation status information sent by the power grid real-time simulation module, and send the first control instruction to the power grid real-time simulation module;

[0046] The real-time power grid simulation module is used to simulate the primary topology of the power grid in real time based on the first control instruction, and obtain the grid-connected node voltage of the wind turbine group, and send it to the power grid simulation device operation control module as a voltage reference value.

[0047] Preferably, the power grid simulation device subsystem 102 is used to simulate the power grid simulation device in real time, and control the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value.

[0048] Preferably, the power grid simulation device subsystem comprises:

[0049] A power grid simulation device operation control module, used to generate a second control instruction based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, and send the second control instruction to the power grid simulation device real-time simulation module;

[0050] The real-time simulation module of the power grid simulation device is used to simulate the primary circuit of the power grid simulation device in real time based on the second control instruction and output the required grid-connected voltage.

[0051] Preferably, the wind turbine generator set under test subsystem 103 is used to perform real-time simulation on the wind turbine generator set under test, and output feedback current to the power grid subsystem based on the grid-connected voltage.

[0052] Preferably, the wind turbine generator subsystem under test comprises:

[0053] The wind turbine unit under test operation control module is used to generate a third control instruction based on the third operation status information sent by the real-time simulation module of the wind turbine unit under test, and send the third control instruction to the real-time simulation module of the wind turbine unit under test,

[0054] The real-time simulation module of the wind turbine under test is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and output feedback current to the real-time simulation module of the power grid based on the grid-connected voltage.

[0055] Preferably, the operation control module of the wind turbine set under test is further used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be grid-connected.

[0056] Combination Figure 2 As shown, the wind power grid-connected test system combining power and control hardware in the loop of the present invention includes three subsystems, namely: a power grid subsystem, a power grid simulation device subsystem and a tested wind turbine subsystem.

[0057] Among them, the power grid subsystem includes a power grid operation control part and a power grid real-time simulation part. The power grid operation control part generates and issues control instructions based on the operation status information reported by the power grid real-time simulation part. The power grid real-time simulation part simulates the primary topology of the power grid in real time according to the control instructions.

[0058] The power grid simulation device subsystem includes a control part and a real-time simulation part. The control part generates control instructions for the power grid simulation device according to the operating status information reported by the real-time simulation part. The real-time simulation part receives the control instructions and performs real-time simulation on the primary circuit of the power grid simulation device.

[0059] The wind turbine subsystem under test also includes a control part and a real-time simulation part. The control part generates a grid-connected control instruction for the wind turbine under test according to the operating status information reported by the real-time simulation part. The real-time simulation part receives the control instruction and performs real-time simulation on the primary circuit of the wind turbine under test.

[0060] Among the above three subsystems, the real-time simulation part in the power grid subsystem sends the node voltage reference to the control part in the power grid simulation device subsystem after simulating and obtaining the voltage of the wind turbine grid-connected node. The control part in the power grid simulation device subsystem uses the received node voltage reference as a control instruction to control the primary circuit output required grid-connected voltage in the real-time simulation part. The real-time simulation part in the tested wind turbine subsystem, under the control of its grid-connected control part, is electrically connected to the grid with the real-time simulation part in the grid simulation control subsystem; at the same time, after simulating and obtaining the grid-connected current of the tested wind turbine, the real-time simulation part in the tested wind turbine subsystem sends the grid-connected current feedback to the real-time simulation part in the power grid subsystem for the next cycle simulation.

[0061] The wind power grid-connected test system combining power and control hardware in the loop according to the embodiment of the present invention is as follows: Figure 3 As shown, it includes: real-time simulation equipment, power grid operation controller, power grid simulation device controller and tested wind turbine controller. A power grid primary topology simulation model, a power grid simulation device primary circuit simulation model and a tested wind turbine primary circuit simulation model are established in the real-time simulation equipment. The power grid simulation device primary circuit simulation model and the tested wind turbine primary circuit simulation model are electrically connected to exchange three-phase voltage and current information; the wind turbine primary circuit simulation model performs analog quantity communication with the power grid primary topology simulation model to transmit the output current information of the tested wind turbine. The power grid operation controller and the power grid primary topology simulation model in the real-time simulation equipment perform analog quantity and digital quantity communication, exchange operation status and control instruction information; the power grid simulation device controller and the power grid simulation device primary circuit simulation model in the real-time simulation equipment perform analog quantity and digital quantity communication, exchange operation status and control instruction information; the tested wind turbine controller and the tested wind turbine primary circuit simulation model in the real-time simulation equipment perform analog quantity and digital quantity communication, exchange operation status and control instruction information. In addition, the power grid primary topology simulation model in the real-time simulation equipment performs analog quantity communication with the power grid simulation device controller to transmit node voltage reference information.

[0062] The wind power grid-connected test system combining power and control hardware in the loop of the present invention adopts the control hardware in the loop method to perform wind power grid-connected test, which can accelerate the development of wind turbine power hardware in the loop grid-connected test and ensure the operational safety of the power hardware in the loop test system.

[0063] Figure 4 FIG. 4 is a flow chart of a wind power grid connection test method 400 combining power and control hardware in the loop according to an embodiment of the present invention. Figure 4As shown, the test method 400 of the wind power grid-connected test system based on the power-control hardware-in-the-loop combined as described above provided in the embodiment of the present invention starts from step 401. In step 401, the power grid subsystem is used to simulate the power grid in real time, and the node voltage of the wind turbine group connected to the grid is output and sent to the power grid simulation device subsystem as a voltage reference value.

[0064] Preferably, the power grid subsystem is used to simulate the power grid in real time, and the voltage of the wind turbine grid-connected node is output and sent to the power grid simulation device subsystem as a voltage reference value, including:

[0065] Using the power grid operation control module in the power grid subsystem, a first control instruction is generated based on the first operation status information sent by the power grid real-time simulation module, and sent to the power grid real-time simulation module;

[0066] The real-time grid simulation module in the grid subsystem is used to simulate the primary topology of the grid in real time based on the first control instruction, and the grid-connected node voltage of the wind turbine is obtained and sent to the grid simulation device operation control module as a voltage reference value.

[0067] In step 402, the power grid simulation device subsystem is used to perform real-time simulation on the power grid simulation device, and the grid-connected voltage required by the primary circuit output of the power grid simulation device is controlled based on the node voltage reference value.

[0068] Preferably, the power grid simulation device is simulated in real time by using the power grid simulation device subsystem, and the grid-connected voltage required by the primary circuit output of the power grid simulation device is controlled based on the node voltage reference value, including:

[0069] Using the power grid simulation device operation control module in the power grid simulation device subsystem, based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, a second control instruction is generated and sent to the power grid simulation device real-time simulation module;

[0070] The real-time simulation module of the power grid simulation device in the power grid simulation device subsystem is utilized to perform real-time simulation of the primary circuit of the power grid simulation device based on the second control instruction to obtain the required grid-connected voltage.

[0071] In step 403, the wind turbine generator set under test is simulated in real time using the wind turbine generator set under test subsystem, and a feedback current is output to the grid subsystem based on the grid-connected voltage.

[0072] Preferably, the method of using the wind turbine subsystem to simulate the wind turbine subsystem in real time and outputting feedback current to the grid subsystem based on the grid-connected voltage includes:

[0073] Using the tested wind turbine set operation control module in the tested wind turbine set subsystem, a third control instruction is generated based on the third operation state information sent by the tested wind turbine set real-time simulation module, and sent to the tested wind turbine set real-time simulation module;

[0074] The real-time simulation module of the wind turbine under test in the wind turbine under test subsystem is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and the feedback current is output to the grid real-time simulation module based on the grid-connected voltage.

[0075] Preferably, the method further comprises:

[0076] The operation control module of the wind turbine set under test is used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be grid-connected.

[0077] The power-control hardware-in-the-loop combined wind power grid-connected test method 400 of the embodiment of the present invention corresponds to the power-control hardware-in-the-loop combined wind power grid-connected test system 100 of another embodiment of the present invention, which will not be described in detail here.

[0078] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0079] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of said means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0080] 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.

[0081] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), 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 produce 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.

[0082] 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 1 A function specified in one or more boxes.

[0083] 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.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A wind power grid-connected test system combining power and control hardware in the loop, characterized in that: The system comprises: The power grid subsystem is used to simulate the power grid in real time, output the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device subsystem as a voltage reference value; A power grid simulation device subsystem, used to simulate the power grid simulation device in real time, and control the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value; The wind turbine generator set subsystem under test is used to perform real-time simulation on the wind turbine generator set under test and output feedback current to the power grid subsystem based on the grid-connected voltage.

2. The system according to claim 1, characterized in that The power grid subsystem comprises: A power grid operation control module, used to generate a first control instruction based on the first operation status information sent by the power grid real-time simulation module, and send the first control instruction to the power grid real-time simulation module; The real-time power grid simulation module is used to simulate the primary topology of the power grid in real time based on the first control instruction, and obtain the voltage value of the wind turbine grid-connected node, and send it to the power grid simulation device operation control module as a voltage reference value.

3. The system according to claim 1, characterized in that The power grid simulation device subsystem comprises: A power grid simulation device operation control module, used to generate a second control instruction based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, and send the second control instruction to the power grid simulation device real-time simulation module; The real-time simulation module of the power grid simulation device is used to simulate the primary circuit of the power grid simulation device in real time based on the second control instruction and output the required grid-connected voltage.

4. The system according to claim 1, characterized in that The wind turbine subsystem under test comprises: The wind turbine unit under test operation control module is used to generate a third control instruction based on the third operation status information sent by the real-time simulation module of the wind turbine unit under test, and send the third control instruction to the real-time simulation module of the wind turbine unit under test; The real-time simulation module of the wind turbine under test is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and output feedback current to the real-time simulation module of the power grid based on the grid-connected voltage.

5. The system according to claim 4, characterized in that The operation control module of the wind turbine set under test is also used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be connected to the grid.

6. A test method for a wind power grid-connected test system based on the power-control hardware-in-the-loop combined system according to any one of claims 1 to 5, characterized in that: The method comprises: The power grid subsystem is used to simulate the power grid in real time, output the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device subsystem as a voltage reference value; Using the power grid simulation device subsystem to perform real-time simulation on the power grid simulation device, and controlling the grid-connected voltage required by the primary circuit output of the power grid simulation device based on the node voltage reference value; The wind turbine generator set under test is simulated in real time using the wind turbine generator set under test subsystem, and a feedback current is output to the power grid subsystem based on the grid-connected voltage.

7. The method according to claim 6, characterized in that The power grid subsystem is used to simulate the power grid in real time, output the voltage of the wind turbine grid-connected node, and send it to the power grid simulation device subsystem as a voltage reference value, including: Using the power grid operation control module in the power grid subsystem, a first control instruction is generated based on the first operation status information sent by the power grid real-time simulation module, and sent to the power grid real-time simulation module; The real-time grid simulation module in the grid subsystem is used to simulate the primary topology of the grid in real time based on the first control instruction, and the node voltage of the wind turbine connected to the grid is obtained and sent to the grid simulation device operation control module as a voltage reference value.

8. The method according to claim 6, characterized in that The power grid simulation device is simulated in real time by using the power grid simulation device subsystem, and the grid-connected voltage required by the primary circuit output of the power grid simulation device is controlled based on the node voltage reference value, including: Using the power grid simulation device operation control module in the power grid simulation device subsystem, based on the second operation status information sent by the power grid simulation device real-time simulation module and the node voltage reference value, a second control instruction is generated and sent to the power grid simulation device real-time simulation module; The real-time simulation module of the power grid simulation device in the power grid simulation device subsystem is used to simulate the primary circuit of the power grid simulation device in real time based on the second control instruction to output the required grid-connected voltage.

9. The method according to claim 6, characterized in that Using the wind turbine subsystem to perform real-time simulation on the wind turbine subsystem to be tested, and outputting feedback current to the grid subsystem based on the grid-connected voltage includes: Using the tested wind turbine operation control module in the tested wind turbine subsystem, a third control instruction is generated based on the third operation status information sent by the tested wind turbine real-time simulation module, and sent to the tested wind turbine real-time simulation module, The real-time simulation module of the wind turbine under test in the wind turbine under test subsystem is used to perform real-time simulation on the primary circuit of the wind turbine under test based on the third control instruction, and the feedback current is output to the real-time simulation module of the power grid based on the grid-connected voltage.

10. The method according to claim 9, characterized in that The method further comprises: The operation control module of the wind turbine set under test is used to control the real-time simulation module of the wind turbine set under test to be electrically connected to the real-time simulation module of the power grid simulation device and to be grid-connected.

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