Simulation method and system for very fast electromagnetic transient process VFT of GIS substation

Abstract

The invention discloses a VFT simulation method and system for a GIS substation ultra-fast electromagnetic transient process, and belongs to the technical field of electromagnetic transient of a power system. The method comprises the following steps: establishing a GIS external space full-wave model for the outside of a GIS substation and establishing a GIS internal transmission line model for the inside of the GIS substation; through the GIS internal transmission line model, taking equivalent impedance of a GIS transformer substation outside a GIS transformer substation at a GIS transformer substation bushing unshielded port as a load, and taking an isolation switch arc process as an excitation source, performing simulation on the internal VFT of the GIS transformer substation; and through the GIS external space full-wave model, taking a Thevenin equivalent circuit at the port of the unshielded part of the GIS transformer substation sleeve in the GIS transformer substation as an excitation source, and performing simulation on the external VFT of the GIS transformer substation. The method is simple in calculation and small in workload.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic transient technology of power system, and more specifically, to a simulation method and system for ultra-fast electromagnetic transient process VFT of GIS substation. Background Art

[0002] The very fast transient electromagnetic process (VFT) generated by the disconnector operation of GIS substation has the characteristics of high amplitude, short waveform rise time, wide frequency range, and continuous multiple pulses, which not only threatens the insulation of the primary equipment of the substation, but also affects the reliable operation of the secondary equipment of the substation. The simulation modeling of the very fast transient electromagnetic process of GIS substation can realize the prediction and analysis of the transient process and provide a basis for the design of GIS substation.

[0003] The simulation of ultra-fast electromagnetic transient processes is usually based on the transmission line method. The GIS busbar, overhead line, and bushing adopt the transmission line model, while the disconnector, mutual inductor, transformer and other equipment are embedded in the transmission line model in the form of lumped circuits. In engineering applications, it is found that there are still large errors between the calculated and measured results in the waveform attenuation speed and some high-frequency components, and the focus is on the modeling of bushings and overhead lines. In terms of the bushing model, since the conductors above the unshielded port of the bushing do not meet the TEM wave mode and are perpendicular to the ground, there is an unreasonable transmission line approximation problem, and the radiation effect should not be ignored. In terms of the overhead line model, the GIS substation overhead line is tens of meters above the ground, and the frequency range that meets the transmission line approximation conditions is only a few MHz, which cannot cover the frequency range of tens of MHz of the GIS ultra-fast electromagnetic transient process, and the transmission line model is difficult to consider the influence of the dispersion effect of the soil under the line. In recent years, a small number of studies have established full-wave models of GIS substations, but due to the large amount of calculation, the engineering feasibility is low. Summary of the invention

[0004] In view of the above problems, the present invention proposes a simulation method for ultra-fast electromagnetic transient process VFT of GIS substation, comprising:

[0005] Establish a GIS external space full-wave model for the outside of the GIS substation and a GIS internal transmission line model for the inside of the GIS substation;

[0006] Through the GIS internal transmission line model, the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing is used as the load, and the arc process of the disconnector is used as the excitation source to simulate the VFT inside the GIS substation;

[0007] Through the GIS external space full-wave model, the GIS substation external VFT is simulated by taking the Thevenin equivalent circuit at the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source.

[0008] Optionally, the GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation bushing port as the coupling point.

[0009] Optionally, the coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and the connection between the GIS internal transmission line model and the GIS external space full-wave model is completed through port equivalence.

[0010] Optionally, the GIS external space full-wave model uses the unshielded port of the internal bushing of the GIS substation as the excitation port.

[0011] Optionally, the VFT inside the GIS substation is simulated by using the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source, including:

[0012] Equivalence the outside of GIS substation at the bushing port inside GIS substation;

[0013] The equivalent of the outside of the GIS substation at the GIS substation bushing port includes:

[0014] The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load;

[0015] Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

[0016] Optionally, the GIS external space full-wave model is used to simulate the external VFT of the GIS substation by taking the Thevenin equivalent circuit of the port at the unshielded part of the GIS substation bushing inside the GIS substation as the excitation source, including:

[0017] The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established.

[0018] Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

[0019] On the other hand, the present invention also proposes a simulation system for ultra-fast electromagnetic transient process VFT of GIS substation, comprising:

[0020] A modeling unit, used to establish a GIS external space full-wave model for the outside of the GIS substation and a GIS internal transmission line model for the inside of the GIS substation;

[0021] An internal simulation unit is used to simulate the VFT inside the GIS substation through the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source;

[0022] The external simulation unit is used to simulate the external VFT of the GIS substation through the GIS external space full-wave model and the Thevenin equivalent circuit of the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source.

[0023] Optionally, the GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation bushing port as the coupling point.

[0024] Optionally, the coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and the connection between the GIS internal transmission line model and the GIS external space full-wave model is completed through port equivalence.

[0025] Optionally, the GIS external space full-wave model uses the unshielded port of the internal bushing of the GIS substation as the excitation port.

[0026] Optionally, the VFT inside the GIS substation is simulated by using the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source, including:

[0027] Equivalence the outside of GIS substation at the bushing port inside GIS substation;

[0028] The equivalent of the outside of the GIS substation at the GIS substation bushing port includes:

[0029] The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load;

[0030] Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

[0031] Optionally, the GIS external space full-wave model is used to simulate the external VFT of the GIS substation by taking the Thevenin equivalent circuit of the port at the unshielded part of the GIS substation bushing inside the GIS substation as the excitation source, including:

[0032] The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established.

[0033] Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

[0034] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0035] a processor for executing one or more programs;

[0036] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0037] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention provides a simulation method for very fast electromagnetic transient process VFT of GIS substation, including: establishing a GIS external space full-wave model for the outside of GIS substation and establishing a GIS internal transmission line model for the inside of GIS substation; through the GIS internal transmission line model, taking the equivalent impedance of the port at the unshielded part of the GIS substation bushing outside the GIS substation as the load, and taking the arc process of the disconnector as the excitation source, simulating the VFT inside the GIS substation; through the GIS external space full-wave model, taking the Thevenin equivalent circuit of the port at the unshielded part of the GIS substation bushing inside the GIS substation as the excitation source, simulating the VFT outside the GIS substation. The method of the present invention is simple in calculation and has a small workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a flow chart of the method of the present invention;

[0041] Figure 2 It is a structural principle diagram of a model of an embodiment of the method of the present invention;

[0042] Figure 3 The structural diagram of the system of the present invention is DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] Embodiment 1:

[0046] The present invention proposes a simulation method for ultra-fast electromagnetic transient process VFT in GIS substation, such as Figure 1 As shown, including:

[0047] Step 1: Establish a GIS external space full-wave model for the outside of the GIS substation and establish a GIS internal transmission line model for the inside of the GIS substation;

[0048] Step 2, through the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source, the VFT inside the GIS substation is simulated;

[0049] Step 3: Through the GIS external space full-wave model, the Thevenin equivalent circuit at the unshielded port of the GIS substation bushing inside the GIS substation is used as an excitation source to simulate the external VFT of the GIS substation.

[0050] Among them, the GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation casing port as the coupling point.

[0051] Among them, the coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and through port equivalence, the connection between the GIS internal transmission line model and the GIS external space full-wave model is completed.

[0052] Among them, the GIS external space full-wave model uses the unshielded port of the internal bushing of the GIS substation as the excitation port.

[0053] Among them, through the GIS internal transmission line model, the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing is used as the load, and the arc process of the disconnector is used as the excitation source to simulate the VFT inside the GIS substation, including:

[0054] Equivalence the outside of GIS substation at the bushing port inside GIS substation;

[0055] The equivalent of the outside of the GIS substation at the GIS substation bushing port includes:

[0056] The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load;

[0057] Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

[0058] Among them, through the GIS external space full-wave model, the Thevenin equivalent circuit of the port at the unshielded part of the GIS substation bushing inside the GIS substation is used as the excitation source to simulate the external VFT of the GIS substation, including:

[0059] The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established.

[0060] Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

[0061] The present invention is further described below with reference to specific cases:

[0062] The specific cases are as follows:

[0063] The full-wave model of the GIS external space is coupled with the transmission line model of the GIS internal space at the casing, such as Figure 2 As shown, the specific modeling and simulation steps are as follows:

[0064] 1) Modeling: The full-wave model of GIS external space uses the unshielded port of the bushing as the excitation port, the high-voltage end is the high-voltage conductor such as the bushing conductor and overhead line, and the grounding end is the grounding conductor such as the GIS shell, bracket, grounding grid, and secondary cable shielding layer. The GIS internal transmission line model uses the arc process of the disconnector as the source, which is equivalent to the series connection of the breakdown voltage Vb and the arc resistance Rarc. The GIS busbar constitutes a transmission line network, and the mutual inductor and other equipment are lumped parameters.

[0065] 2) GIS internal VFT simulation: The first step is to perform the equivalence of the GIS outside at the casing port. The Longmire-Smith and other soil models are used to analyze the soil dispersion effect (i.e., the frequency-varying characteristics of the conductivity and dielectric constant). The soil frequency-varying parameters are used in the GIS external space full-wave model to calculate the equivalent impedance ZL of the GIS outside at the casing unshielded port.

[0066] The second step is to calculate the VFT inside the GIS using the internal transmission line model of the GIS. The arc process of the disconnector is used as the excitation source. The arc process excitation source circuit is modeled as a series connection of a step breakdown voltage and a fixed arc resistance. Long-line structures such as the GIS busbar and current transformer are modeled as transmission lines, and non-long-line structures such as voltage transformers, circuit breakers, and disconnectors are modeled as lumped circuits. The transmission line method is then used to calculate the VFT at different locations inside the GIS.

[0067] 3) GIS external VFT simulation: The first step is the equivalence of the GIS inside the bushing port. The arc process is the excitation source. The Thevenin equivalent circuit (VS, ZS) of the GIS inside the bushing unshielded port can be established through the transmission line model; the second step is to calculate the VFT outside the GIS by the GIS external space full-wave model. Since the bushing conductor, overhead line and other high-voltage conductors and the GIS casing, grounding grid, etc. are all line structures, the soil parameters take into account the dispersion effect. The current distribution of the thin wire structure can be calculated by the moment method, and then the spatial potential distribution is calculated to obtain the VFT at different positions outside the GIS.

[0068] The present invention has the following characteristics:

[0069] 1) Establishing the external full-wave model of GIS can analyze the radiation effect of the part above the unshielded port of the casing and the radiation effect of the overhead line, and realize the accurate calculation of the high-frequency components.

[0070] 2) Establish a transmission line model inside GIS. GIS pipelines constitute a good transmission line structure. Compared with the full-wave model, the transmission line method is simple to calculate and reduces the overall calculation amount of the full-wave model.

[0071] Embodiment 2:

[0072] The present invention also proposes a simulation system 200 for ultra-fast electromagnetic transient process VFT of GIS substation, such as Figure 3 As shown, including:

[0073] A modeling unit 201 is used to establish a GIS external space full-wave model for the outside of the GIS substation and to establish a GIS internal transmission line model for the inside of the GIS substation;

[0074] The internal simulation unit 202 is used to simulate the VFT inside the GIS substation through the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source;

[0075] The external simulation unit 203 is used to simulate the external VFT of the GIS substation through the GIS external space full-wave model and the Thevenin equivalent circuit at the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source.

[0076] Among them, the GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation casing port as the coupling point.

[0077] Among them, the coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and through port equivalence, the connection between the GIS internal transmission line model and the GIS external space full-wave model is completed.

[0078] Among them, the GIS external space full-wave model uses the unshielded port of the internal bushing of the GIS substation as the excitation port.

[0079] Among them, through the GIS internal transmission line model, the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing is used as the load, and the arc process of the disconnector is used as the excitation source to simulate the VFT inside the GIS substation, including:

[0080] Equivalence the outside of GIS substation at the bushing port inside GIS substation;

[0081] The equivalent of the outside of the GIS substation at the GIS substation bushing port includes:

[0082] The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load;

[0083] Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

[0084] Among them, through the GIS external space full-wave model, the Thevenin equivalent circuit of the port at the unshielded part of the GIS substation bushing inside the GIS substation is used as the excitation source to simulate the external VFT of the GIS substation, including:

[0085] The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established.

[0086] Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

[0087] The method of the invention has simple calculation and small workload.

[0088] Embodiment 3:

[0089] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0090] Embodiment 4:

[0091] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0092] It will be appreciated by those skilled in the art 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 codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0093] 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.

[0094] 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.

[0095] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0096] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0097] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A simulation method for ultra-fast electromagnetic transient process VFT in GIS substation, characterized in that: include: Establish a GIS external space full-wave model for the outside of the GIS substation and a GIS internal transmission line model for the inside of the GIS substation; Through the GIS internal transmission line model, the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing is used as the load, and the arc process of the disconnector is used as the excitation source to simulate the VFT inside the GIS substation; Through the GIS external space full-wave model, the GIS substation external VFT is simulated by taking the Thevenin equivalent circuit at the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source.

2. The simulation method according to claim 1, characterized in that: The GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation bushing port as the coupling point.

3. The simulation method according to claim 1, characterized in that: The coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and completes the connection between the GIS internal transmission line model and the GIS external space full-wave model through port equivalence.

4. The simulation method according to claim 1, characterized in that: The GIS external space full-wave model uses the unshielded port of the inner bushing of the GIS substation as the excitation port.

5. The simulation method according to claim 1, characterized in that: The GIS internal transmission line model is used to simulate the VFT inside the GIS substation by taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load and taking the arc process of the disconnector as the excitation source, including: Equivalence the outside of GIS substation at the bushing port inside GIS substation; The equivalent of the outside of the GIS substation at the GIS substation bushing port includes: The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load; Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

6. The simulation method according to claim 1, characterized in that: The GIS external space full-wave model is used to simulate the external VFT of the GIS substation by taking the Thevenin equivalent circuit of the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source, including: The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established. Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

7. A simulation system for ultra-fast electromagnetic transient process VFT in GIS substation, characterized in that: include: A modeling unit, used to establish a GIS external space full-wave model for the outside of the GIS substation and a GIS internal transmission line model for the inside of the GIS substation; An internal simulation unit is used to simulate the VFT inside the GIS substation through the GIS internal transmission line model, taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load, and taking the arc process of the disconnector as the excitation source; The external simulation unit is used to simulate the external VFT of the GIS substation through the GIS external space full-wave model and the Thevenin equivalent circuit of the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source.

8. The simulation system according to claim 7, characterized in that: The GIS external space full-wave model and the GIS internal transmission line model are coupled with the GIS substation bushing port as the coupling point.

9. The simulation system according to claim 7, characterized in that: The coupling point is used to connect the GIS internal transmission line model with the GIS external space full-wave model, and completes the connection between the GIS internal transmission line model and the GIS external space full-wave model through port equivalence.

10. The simulation system according to claim 7, characterized in that: The GIS external space full-wave model uses the unshielded port of the inner bushing of the GIS substation as the excitation port.

11. The simulation system according to claim 7, characterized in that: The GIS internal transmission line model is used to simulate the VFT inside the GIS substation by taking the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing as the load and taking the arc process of the disconnector as the excitation source, including: Equivalence the outside of GIS substation at the bushing port inside GIS substation; The equivalent of the outside of the GIS substation at the GIS substation bushing port includes: The Longmire-Smith soil model is used to calculate the soil dispersion effect outside the GIS substation to obtain soil frequency-dependent parameters, and the soil frequency-dependent parameters are used through the GIS internal transmission line model to calculate the equivalent impedance of the port outside the GIS substation at the unshielded part of the GIS substation bushing, and the equivalent impedance is used as the load; Based on the load, the VFT value inside the GIS substation is calculated through the GIS internal transmission line model, and the VFT values ​​at different positions inside the GIS are calculated using the transmission line method with the arc process of the disconnector as the excitation source.

12. The simulation system according to claim 7, characterized in that: The GIS external space full-wave model is used to simulate the external VFT of the GIS substation by taking the Thevenin equivalent circuit of the unshielded port of the GIS substation bushing inside the GIS substation as the excitation source, including: The GIS substation is equivalent to the bushing port, and the arc process is used as the excitation source. Through the GIS internal transmission line model, the Thevenin equivalent circuit of the bushing unshielded port inside the GIS substation is established. Based on the Thevenin equivalent circuit, the VFT value outside the GIS substation is calculated by the GIS external space full-wave model, the current distribution of the fine wire structure is calculated by the moment method, and the spatial potential distribution is calculated based on the current distribution, based on the spatial potential distribution and the VFT value outside the GIS substation.

13. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 6 is implemented.

14. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 6 is implemented.

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