Three-phase short-circuit test method and device for modeling at new energy power plant level

Abstract

This invention discloses a three-phase short-circuit test method and apparatus for modeling new energy power plants. The method includes: verifying the normal operation of the new energy unit by putting the dynamic reactive power compensation device into AVC reactive power closed-loop operation and ensuring that the output of the wind-solar-storage new energy power plant is not less than the preset power; temporarily taking the wind turbine and transformer connected to the wind turbine feeder out of operation, disconnecting switch 341, and cooling the wind turbine line for standby; wrapping 40cm of three-phase steel-cored aluminum stranded wire with aluminum-clad tape at the end of the wind turbine line; short-circuiting the three-phase transmission line at the center of the aluminum-clad tape wrapping using a momentary failure conductor; cooling the wind turbine line for standby to prepare for the test; closing switch 341 to induce a three-phase short circuit fault in the wind turbine line, causing the momentary failure conductor to burn out, triggering the line protection switch 341 to trip, and completing the test.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a three-phase short-circuit test method and apparatus for modeling new energy power plants. Background Technology

[0002] To achieve the goals of "carbon peaking and carbon neutrality," building a new power system dominated by new energy sources is a future development trend. The grid connection of numerous new energy power plants will pose significant challenges to the safety and stability of the power grid. Currently, modeling at the new energy power plant level is conducted from a theoretical and simulation perspective, requiring comparison of simulation data with actual field test data to ensure the model closely matches the actual power grid. Three-phase short-circuit faults are among the most serious faults in power systems. Conducting three-phase short-circuit tests on new energy power plants can effectively assess their grid connection performance, verify short-circuit characteristic curves, and perform transient characteristic fitting, which is beneficial for subsequent new energy power plant-level modeling calculations. However, short-circuit tests pose certain risks to the safe and stable operation of the power grid and equipment, requiring special operating modes, protection coordination methods, and the setting of reasonable short-circuit locations to minimize the impact of the test on the power grid.

[0003] Therefore, how to select an accurate, efficient, and safe testing method for three-phase short-circuit testing of new energy power plant-level models is an urgent problem to be solved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a three-phase short-circuit test method and apparatus for modeling new energy power plant levels.

[0005] According to one aspect of the present invention, a three-phase short-circuit test method for modeling at the renewable energy power plant level is provided, comprising:

[0006] Verify whether the new energy units are operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind, solar and energy storage new energy power station is not less than the preset power.

[0007] Temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect switch 341, and turn the fan line to standby for cooling.

[0008] At the end of the wind turbine line, use aluminum-clad tape to wrap the three-phase steel core aluminum stranded wire for 40 cm;

[0009] At the center of the aluminum-clad tape wrapping, use a quick-break wire to short-circuit the three-phase transmission line;

[0010] The fan line was heated and put into standby mode to prepare for the test.

[0011] Close switch 341 to simulate a three-phase short circuit fault in the wind turbine line. The instantaneous fault line burns out, the line protection switch 341 trips, and the test is complete.

[0012] Optionally, the method also includes: after the test is completed, switching the fan line to cold standby, removing the temporary test equipment, and restoring it to its original operating state.

[0013] Optionally, the preset power is 30% of the rated power.

[0014] Optionally, the method further includes:

[0015] Select the transformer substation as the test wiring lead-out location;

[0016] Disconnect the transformer fan side cable from the grid side, connect the temporary test cable to the grid side feeder, pass through the insulation support, and go to the circuit breaker break side.

[0017] Connect the other side of the circuit breaker break to the reactor via an insulating support;

[0018] The reactor is short-circuited via the tail-end insulating support and the short-circuit instantaneous failure line;

[0019] Before the test, the circuit breaker was switched off. After the wiring was completed, the grid-side feeder was restored to power.

[0020] The test command was issued, and the circuit breaker was triggered to close via remote control, causing a three-phase short circuit. The short circuit current caused the short-circuit instantaneous failure line to burn out, and the test was completed.

[0021] Optionally, the method further includes: delaying the disconnection of the circuit breaker to prevent test failure.

[0022] According to another aspect of the present invention, a three-phase short-circuit test device for modeling at the renewable energy power plant level is provided, comprising:

[0023] The operation module is used to verify whether the new energy units are operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind, solar and energy storage new energy power station is not less than the preset power.

[0024] The cooling standby module is used to temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect the 341 switch, and switch the fan line to cooling standby.

[0025] The winding module is used to wrap a 40cm section of three-phase steel-core aluminum stranded wire with aluminum-clad tape at the end of the wind turbine line.

[0026] A short-circuit module is used to short-circuit three-phase transmission lines at the center of the aluminum-clad tape wrapping using a quick-break wire;

[0027] The heat transfer backup module is used to switch the fan line to heat backup, so that the test conditions are met;

[0028] The three-phase short-circuit fault module is used to simulate a three-phase short circuit fault in the wind turbine line by closing the 341 switch. The instantaneous line burns out, the line protection 341 switch trips, and the test is completed.

[0029] Optionally, the device also includes a recovery module for: switching the fan line to cold standby after the test is completed, removing the temporary test equipment, and restoring it to its original operating state.

[0030] Optionally, the preset power is 30% of the rated power.

[0031] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0032] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0033] Therefore, this invention conducted three-phase short-circuit tests on 35kV feeders for wind turbine units and transformer substations for new energy units to meet the testing requirements under different operating conditions. This invention allows for flexible three-phase short-circuit testing in various scenarios, with highly operable testing methods, high accuracy, and guaranteed safety. It facilitates checking the symmetry of three-phase currents, reduces the influence of zero-sequence current, better enables parameter identification, and facilitates new energy modeling. Attached Figure Description

[0034] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0035] Figure 1 This is a flowchart illustrating a three-phase short-circuit test method for new energy power station-level modeling provided by an exemplary embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a three-phase short-circuit test of a 35kV overhead line provided in an exemplary embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of a three-phase short-circuit test of the transformer substation lead wires provided in an exemplary embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of a three-phase short-circuit test device for modeling new energy power stations, provided by an exemplary embodiment of the present invention;

[0039] Figure 5This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0040] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0041] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0042] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0043] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0044] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0045] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0046] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0047] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0048] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0049] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0051] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0052] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0053] Exemplary methods

[0054] Figure 1 This is a flowchart illustrating a three-phase short-circuit test method for new energy power plant-level modeling, provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 1 As shown, the three-phase short-circuit test method 100 for new energy power plant-level modeling includes the following steps:

[0055] Step 101: Verify whether the new energy unit is operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind-solar-storage new energy power station is not less than the preset power.

[0056] Optionally, the preset power is 30% of the rated power.

[0057] Step 102: Temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect switch 341, and turn the fan line into a standby cooling mode.

[0058] Step 103: At the end of the wind turbine line, wrap 40 cm of the three-phase steel core aluminum stranded wire with aluminum-clad tape.

[0059] Step 104: At the center of the aluminum-clad tape wrapping, use a quick-break wire to short-circuit the three-phase transmission line;

[0060] Step 105: Heat up the fan line for standby to prepare for the test.

[0061] Step 106: Close switch 341 to simulate a three-phase short circuit fault in the wind turbine line. The instantaneous fault line burns out, the line protection switch 341 trips, and the test is complete.

[0062] Optionally, the method also includes: after the test is completed, switching the fan line to cold standby, removing the temporary test equipment, and restoring it to its original operating state.

[0063] In an embodiment of the present invention, a schematic diagram of a three-phase short-circuit test of a 35kV overhead line is shown below. Figure 2 As shown. Combined with Figure 2 As shown, the specific steps of the three-phase short-circuit test method for the 35kV feeder of the wind turbine are as follows:

[0064] In step 1, a three-phase short-circuit test is conducted on the 35kV feeder of the wind turbine. This verifies the normal operation of the renewable energy unit, ensures the Dynamic Var Compensator (SVG) is engaged in AVC reactive power closed-loop operation, and guarantees that the output of the wind-solar-storage renewable energy power station is not less than 30% of its rated power. A schematic diagram of the test is shown below. Figure 1 As shown.

[0065] In step 2, the fan and transformer connected to the fan feeder are temporarily taken out of operation, the 341 switch is disconnected, and the fan line is switched to standby for cooling.

[0066] In step 3, aluminum-clad tape is used to wrap 40 cm of the three-phase steel-cored aluminum stranded wire at the end of the wind turbine line. The wrapping must be secure to effectively protect the transmission line.

[0067] In step 4, the three-phase transmission lines are short-circuited using a break wire at the center of the aluminum-clad tape wrapping.

[0068] In step 5, the fan line is heated and put into standby mode to prepare for the test.

[0069] In step 6, the test commander issues the test instruction: close switch 341 to induce a three-phase short circuit fault in the wind turbine line. The instantaneous fault line burns out, the line protection switch 341 trips, and the test is completed.

[0070] In step 7, the fan line is switched to cold standby, the temporary test equipment is removed, and the original operating state is restored.

[0071] Furthermore, this invention also proposes a three-phase short-circuit test method for transformer substations in new energy power generation units, specifically including the following steps:

[0072] In step 1, to ensure the test method is applicable to wind power and photovoltaic power, common wiring locations at various power stations were identified, and the unit's transformer substation was selected as the test wiring lead-out location. The test schematic diagram is shown below. Figure 3 As shown.

[0073] In step 2, the transformer fan side cable is disconnected from the grid side, and the temporary test cable is connected to the grid side feeder, passing through the insulating support to the circuit breaker break side; the other side of the circuit breaker break is connected to the reactor through the insulating support; the reactor passes through the tail end insulating support and is short-circuited through the short-circuit instantaneous failure line.

[0074] In step 3, the circuit breaker is switched off before the test; after the wiring is completed, the grid-side feeder is restored to power.

[0075] In step 4, a test command is issued, triggering the circuit breaker to close via remote control, causing a three-phase short circuit. The short-circuit current causes the short-circuit fault line to burn out, completing the test. To prevent test failure, the circuit breaker should disconnect after a time delay.

[0076] Therefore, this invention conducted three-phase short-circuit tests on 35kV feeders for wind turbine units and transformer substations for new energy units to meet the testing requirements under different operating conditions. This invention allows for flexible three-phase short-circuit testing in various scenarios, with highly operable testing methods, high accuracy, and guaranteed safety. It facilitates checking the symmetry of three-phase currents, reduces the influence of zero-sequence current, better enables parameter identification, and facilitates new energy modeling.

[0077] Exemplary System

[0078] Figure 4 This is a schematic diagram of the structure of a three-phase short-circuit test device for new energy power plant-level modeling, provided by an exemplary embodiment of the present invention. Figure 4 As shown, the device 400 includes:

[0079] The operation module 410 is used to verify whether the new energy unit is operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind, solar and energy storage new energy power station is not less than the preset power.

[0080] The cooling standby module 420 is used to temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect the 341 switch, and switch the fan line to cooling standby.

[0081] The winding module 430 is used to wrap a 40cm section of three-phase steel-core aluminum stranded wire with aluminum-clad tape at the end of a wind turbine line.

[0082] The short-circuit module 440 is used to short-circuit a three-phase transmission line at the center of the aluminum-clad tape wrapping using a quick-break wire;

[0083] The heat transfer standby module 450 is used to switch the fan line to heat standby so that the test conditions are met.

[0084] The three-phase short-circuit fault module 460 is used to perform a simulated three-phase short-circuit fault on the wind turbine line by closing switch 341. The instantaneous line burns out, the line protection switch 341 trips, and the test is completed.

[0085] Optionally, the device 400 also includes a recovery module for: switching the fan line to cold standby after the test is completed, removing the temporary test equipment, and restoring it to its original operating state.

[0086] Optionally, the preset power is 30% of the rated power.

[0087] Optionally, the device 400 further includes:

[0088] The selection module is used to select the test wiring lead-out position of the unit's transformer box;

[0089] The access module is used to disconnect the transformer fan side cable from the grid side, connect the temporary test cable to the grid side feeder, and then, through the insulated support, to the circuit breaker break side.

[0090] A connecting module is used to connect the other side of the circuit breaker break to the reactor via an insulating support;

[0091] The short-circuit module is used to short-circuit the reactor via the tail-end insulating support and the short-circuit instantaneous failure line;

[0092] The power restoration module is used to disconnect the circuit breaker before testing and restore power to the grid-side feeder after the wiring is completed.

[0093] The three-phase short-circuit module is used to issue test commands. The circuit breaker is triggered to close via remote control, causing a three-phase short circuit. The short-circuit current causes the short-circuit instantaneous failure wire to burn out, and the test is completed.

[0094] Optionally, the device 400 also includes a time-delay disconnect module for delaying the disconnection of the circuit breaker to prevent test failure.

[0095] The three-phase short-circuit test device 400 for new energy power station-level modeling in one embodiment of the present invention corresponds to the three-phase short-circuit test method 100 for new energy power station-level modeling in another embodiment of the present invention, and will not be described again here.

[0096] Exemplary electronic devices

[0097] Figure 5 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. The electronic device may be either or both of a first device and a second device, or a standalone device independent of them, which may communicate with the first device and the second device to receive acquired input signals from them. Figure 5A block diagram of an electronic device according to an embodiment of the present invention is illustrated. Figure 5 As shown, the electronic device 50 includes one or more processors 51 and memory 52.

[0098] The processor 51 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0099] The memory 52 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 51 may execute the program instructions to implement the methods for information mining of historical change records and / or other desired functions of the software programs of the various embodiments of the present invention described above. In one example, the electronic device may also include an input system 53 and an output system 54, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0100] In addition, the input system 53 may also include, for example, a keyboard, a mouse, etc.

[0101] The output system 54 can output various types of information to the outside. The output system 54 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0102] Of course, for the sake of simplicity, Figure 5 Only some of the components of the electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0103] Exemplary computer program products and computer-readable storage media

[0104] In addition to the methods and devices described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps of the methods for information mining of historical change records according to various embodiments of the present invention as described in the "Exemplary Methods" section of this specification.

[0105] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0106] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods for information mining of historical change records according to various embodiments of the present invention as described in the "Exemplary Methods" section above.

[0107] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0108] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0109] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0110] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0111] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0112] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0113] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A three-phase short-circuit test method for modeling at new energy power plant levels, characterized in that, include: Verify whether the new energy units are operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind, solar and energy storage new energy power station is not less than the preset power. Temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect switch 341, and turn the fan line to standby for cooling. At the end of the wind turbine line, use aluminum-clad tape to wrap the three-phase steel core aluminum stranded wire for 40 cm; At the center of the aluminum-clad tape wrapping, use a quick-break wire to short-circuit the three-phase transmission line; The fan line was heated and put into standby mode to prepare for the test. Close switch 341 to simulate a three-phase short circuit fault in the wind turbine line. The instantaneous fault line burns out, the line protection switch 341 trips, and the test is complete.

2. The method according to claim 1, characterized in that, Also includes: After the test is completed, the fan line will be switched to cold standby, the temporary test equipment will be removed, and the original operating status will be restored.

3. The method according to claim 1, characterized in that, The preset power is 30% of the rated power.

4. The method according to claim 1, characterized in that, Also includes: Select the transformer substation as the test wiring lead-out location; Disconnect the transformer fan side cable from the grid side, connect the temporary test cable to the grid side feeder, pass through the insulation support, and go to the circuit breaker break side. Connect the other side of the circuit breaker break to the reactor via an insulating support; The reactor is short-circuited via the tail-end insulating support and the short-circuit instantaneous failure line; Before the test, the circuit breaker was switched off. After the wiring was completed, the grid-side feeder was restored to power. The test command was issued, and the circuit breaker was triggered to close via remote control, causing a three-phase short circuit. The short circuit current caused the short-circuit instantaneous failure line to burn out, and the test was completed.

5. The method according to claim 4, characterized in that, Also includes: To prevent test failure, the circuit breaker will disconnect after a delay.

6. A three-phase short-circuit test device for modeling at new energy power plant levels, characterized in that, include: The operation module is used to verify whether the new energy units are operating normally, put the dynamic reactive power compensation device into AVC reactive power closed-loop operation, and ensure that the output of the wind, solar and energy storage new energy power station is not less than the preset power. The cooling standby module is used to temporarily take the fan and transformer connected to the fan feeder out of operation, disconnect the 341 switch, and switch the fan line to cooling standby. The winding module is used to wrap a 40cm section of three-phase steel-core aluminum stranded wire with aluminum-clad tape at the end of the wind turbine line. A short-circuit module is used to short-circuit three-phase transmission lines at the center of the aluminum-clad tape wrapping using a quick-break wire; The heat transfer backup module is used to switch the fan line to heat backup, so that the test conditions are met; The three-phase short-circuit fault module is used to simulate a three-phase short circuit fault in the wind turbine line by closing the 341 switch. The instantaneous line burns out, the line protection 341 switch trips, and the test is completed.

7. The apparatus according to claim 6, characterized in that, It also includes a recovery module, which is used to: switch the fan line to cold standby after the test is completed, remove the temporary test equipment, and restore it to its original operating state.

8. The apparatus according to claim 6, characterized in that, The preset power is 30% of the rated power.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-5.

10. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-5.

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