Method and device for determining switch arrangement of extra-high voltage transformer substation based on VFTO simulation calculation

Abstract

The invention provides a method and a device for determining switch arrangement of an extra-high voltage transformer substation based on VFTO simulation calculation. The method comprises the following steps: establishing an electromagnetic simulation transient model of the transformer substation according to a design drawing of the extra-high voltage transformer substation to be established, a self-defined equipment inlet capacitance value table and an element equivalent circuit relation table; enabling a corresponding switch to act according to the selected switch operation mode based on the self-defined transformer substation switch operation mode table, and performing simulation calculation on the amplitude of the very fast transient overvoltage of the transformer substation main equipment after the switch action; calculating the insulation margin of the corresponding switch operation mode according to the amplitude and the GIS rated lightning impulse withstand voltage; and according to the insulation margin and a custom margin threshold, determining a switch arrangement result of the extra-high voltage transformer substation to be built. According to the method and the device, the construction cost of the transformer substation is reduced, the internal arrangement is optimized, and the safety of the main equipment of the extra-high voltage transformer substation is fully ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of UHV power transmission, and more particularly, to a method and device for determining the switch arrangement of a UHV substation based on VFTO simulation calculation. Background Art

[0002] Very Fast Transient Over-voltage (VFTO) refers to a transient over-voltage with a wavefront time in the range of 3 ns to 100 ns. VFTO is mainly caused by the operation of disconnectors in Gas Insulated Switchgear (GIS), and can also be caused by other events such as the operation of circuit breakers, the closing of earthing switches, or the occurrence of conductor-to-case flashovers. The VFTO generated by the operation of disconnectors is more dangerous to the insulation of winding equipment than to the GIS body itself. One reason is that the disconnector operates at a relatively slow speed (about 7 to 10 cycles), the arc between the disconnector contacts is continuously reignited and extinguished, usually repeating more than several hundred times. The other reason is that the GIS pipes being switched on and off are very short, and the process of the traveling wave's reflection and refraction is very fast, and they are superimposed on each other, resulting in an extremely high frequency and very steep wavefront of the generated over-voltage, ranging from 3 ns to 100 ns, which leads to a very high amplitude of the generated VFTO over-voltage. Whether it is closing or opening, as long as there is a reignition phenomenon, this type of very fast transient over-voltage will be generated. In most cases, the highest VFTO peak value in GIS is around 1.5 to 2.5 p.u., and it is extremely unlikely to exceed 3.0 p.u.

[0003] In the prior art, in order to prevent the impact of VFTO generated by the operation of disconnectors on the safety of main equipment, a damping resistor is usually selected to be installed on the disconnector to avoid the impact and threat to the main equipment. However, the disconnector equipped with a damping resistor must be vertically arranged, which has a large volume, a complex internal structure, a large floor area, is not conducive to compactness, and is expensive. Summary of the Invention

[0004] In order to solve the technical problems in the prior art that the disconnector equipped with a damping resistor for preventing the impact and threat of VFTO on the safety of main equipment must be vertically arranged, which has a large volume, a complex internal structure, a large floor area, is not conducive to compactness, and is expensive, the present invention provides a method and device for determining the switch arrangement of a UHV substation based on VFTO simulation calculation.

[0005] According to one aspect of the present invention, the present invention provides a method for determining the switch arrangement of a UHV substation based on VFTO simulation calculation, including:

[0006] According to the design drawings of the proposed UHV substation, a substation electromagnetic simulation transient model is established by customizing the equipment inlet capacitance value table and the component equivalent circuit relationship table;

[0007] Based on a custom substation switch operation mode table, make the corresponding switch act according to the selected switch operation mode, and simulate and calculate the amplitude of the very fast transient overvoltage of the main equipment in the substation after the switch actuation;

[0008] Calculate the insulation margin corresponding to the switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS;

[0009] Determine the switch layout result of the proposed UHV substation according to the insulation margin and the custom margin threshold, and the switch layout result includes installing damping resistors on the disconnectors and canceling the installation of damping resistors on the disconnectors.

[0010] According to another aspect of the present invention, the present invention provides a device for determining the switch layout of a UHV substation based on VFTO simulation calculation, and the device includes:

[0011] A model establishment module for establishing a substation electromagnetic simulation transient model according to the design drawings of the proposed UHV substation, customizing the equipment inlet capacitance value table and the component equivalent circuit relationship table;

[0012] An amplitude calculation module for making the corresponding switch act according to the selected switch operation mode based on the custom substation switch operation mode table, and simulating and calculating the amplitude of the very fast transient overvoltage of the main equipment in the substation after the switch actuation;

[0013] A margin calculation module for calculating the insulation margin corresponding to the switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS;

[0014] A result output module for determining the switch layout result of the proposed UHV substation according to the insulation margin and the custom margin threshold, and the switch layout result includes installing damping resistors on the disconnectors and canceling the installation of damping resistors on the disconnectors.

[0015] According to still another aspect of the present invention, the present invention provides a computer-readable storage medium storing a computer program for executing the method described in any one of the above aspects of the present invention.

[0016] According to still another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing executable instructions of the processor; the processor for reading the executable instructions from the memory and executing the instructions to implement the method described in any one of the above aspects of the present invention.

[0017] The method and device for determining the switch arrangement of UHV substations based on VFTO simulation calculation according to the present invention, wherein the method establishes a substation electromagnetic simulation transient model according to the design drawings of the proposed UHV substation, customizes the equipment inlet capacitance value table and the element equivalent circuit relationship table; based on the customized substation switch operation mode table, makes the corresponding switch act according to the selected switch operation mode, and simulates and calculates the amplitude of the very fast transient overvoltage of the main equipment of the substation after the switch action; calculates the insulation margin corresponding to the switch operation mode according to the amplitude and the GIS rated lightning impulse withstand voltage; determines the switch arrangement result of the proposed UHV substation according to the insulation margin and the customized margin threshold. The method and device calculate the VFTO under various disconnector operation modes by establishing a simulation model at the beginning of the design of UHV substations to determine the corresponding insulation margin. When the insulation margins under all operation modes meet the requirements, the damping resistors of the disconnectors are cancelled, thus reducing the construction cost of the substation, optimizing the internal layout, and at the same time, since the insulation margin of the main equipment of the substation can meet the requirements in any disconnector operation mode, the safety of the main equipment of the UHV substation is fully guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The exemplary embodiments of the present invention can be more fully understood by referring to the following drawings:

[0019] Figure 1 FIG. is a flowchart of a method for determining the switch arrangement of UHV substations based on VFTO simulation calculation according to a preferred embodiment of the present invention;

[0020] Figure 2 FIG. is an equivalent diagram of a typical UHV GIS substation established according to a preferred embodiment of the present invention;

[0021] Figure 3 FIG. is a structural schematic diagram of a device for determining the switch arrangement of UHV substations based on VFTO simulation calculation according to a preferred embodiment of the present invention;

[0022] Figure 4 FIG. is a structural schematic diagram of an electronic device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Now, the exemplary embodiments of the present invention will be introduced with reference to the 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 fully and completely disclose the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same unit / element is denoted by the same reference numeral.

[0024] Unless otherwise specified, the terms (including technical terms) used herein have the ordinary meaning understood by those skilled in the relevant technical field. Additionally, it can be understood that terms defined in commonly used dictionaries should be construed as having a meaning consistent with their context in the relevant field, and should not be construed as having an idealized or overly formal meaning.

[0025] Exemplary method

[0026] Figure 1 It is a flowchart of a method for determining the switch arrangement of a UHV substation based on VFTO simulation calculation according to a preferred embodiment of the present invention. As Figure 1 shown, the method for determining the switch arrangement of a UHV substation based on VFTO simulation calculation described in this preferred embodiment starts from step 101.

[0027] In step 101, according to the design drawings of the proposed UHV substation, a transient electromagnetic simulation model of the substation is established by customizing the equipment inlet capacitance value table and the component equivalent circuit relationship table.

[0028] Preferably, the step of establishing a transient electromagnetic simulation model of the substation by customizing the equipment inlet capacitance value table and the component equivalent circuit relationship table according to the design drawings of the proposed UHV substation includes:

[0029] According to the design drawings of the proposed UHV substation, calculate and determine the distances between the various equipment in the proposed UHV substation;

[0030] Based on the customized equipment inlet capacitance value table, determine the inlet capacitance values corresponding to the various equipment in the proposed UHV substation;

[0031] Based on the customized component equivalent circuit table, determine the equivalent circuits of the various components in the proposed UHV substation;

[0032] Generate a transient electromagnetic simulation model of the proposed UHV substation according to the distances between the various equipment in the proposed UHV substation, the inlet capacitance values corresponding to the various equipment, and the equivalent circuits of the various components.

[0033] In this preferred embodiment, the simulation calculation uses the ATP-EMTP (Alternative Transients Program - Electro-Magnetic Transient Program) program. In the calculation, according to the specific equipment configuration and operation mode, the lines, buses, connecting lines and electrical equipment inside the UHV GIS are considered as a network as a whole. Therefore, the first step in establishing the electromagnetic simulation transient model of the proposed UHV substation is to calculate and determine the distances between various equipment according to the design drawings of the proposed UHV substation. Then, equipment in the substation such as transformers, high-voltage reactors, capacitive voltage transformers (CVTs), circuit breakers inside the GIS, current transformers, disconnectors and bus voltage transformers, etc. are all represented by the entrance capacitance of the equipment. The entrance capacitance values of each equipment in the station are shown in Table 1.

[0034] Table 1

[0035]

[0036]

[0037] After determining the distances between equipment and characterizing the entrance capacitance of the equipment, it is also necessary to equivalent each component in the substation. The specific equivalent principle is shown in Table 2.

[0038] Table 2

[0039]

[0040]

[0041] By calculating and determining the distances between various equipment in the proposed UHV substation, the corresponding entrance capacitance values of each equipment and the equivalent circuits of each component, the electromagnetic simulation transient model of the proposed UHV substation can be generated. Figure 2 It is the equivalent diagram of a typical UHV GIS substation established according to the preferred embodiment of the present invention. As Figure 2 shown, the main nodes in the figure are set as important equipment such as disconnectors DS***, circuit breakers CB**, bushings BG**, transformers T**, GIS pipes, etc.

[0042] In step 102, based on the custom substation switch operation mode table, make the corresponding switches act according to the selected switch operation mode, and simulate and calculate the amplitude of the very fast transient overvoltage of the main equipment in the substation after the switch action.

[0043] Preferably, based on the custom substation switch operation mode table, the corresponding switch is actuated according to the selected switch operation mode, and the simulation calculates the amplitude of the very fast transient overvoltage of the main substation equipment after the switch actuation, which means that when the residual DC voltage on the load side is not less than the custom voltage threshold, based on the custom substation switch operation mode table, the corresponding switch is actuated according to the selected switch operation mode, and after the peak-to-peak pre-breakdown occurs between the contacts, the amplitude of the very fast transient overvoltage of the main equipment of the proposed UHV substation is simulated and calculated.

[0044] In this preferred embodiment, for Figure 2 the shown substation equivalent diagram, the custom substation switch operation mode is shown in Table 3.

[0045]

[0046] Taking the custom voltage threshold of 1 p.u. as an example, when there is 1 p.u. residual DC voltage on the load side of the disconnect switch to be operated before operation, a peak-to-peak breakdown occurs between the contacts during operation, and the VFTO amplitude at this time is calculated, then the transient overvoltage level of the main equipment in the substation under this operation mode can be obtained.

[0047] In step 103, according to the amplitude and the GIS rated lightning impulse withstand voltage, the insulation margin corresponding to the switch operation mode is calculated.

[0048] Preferably, for calculating the insulation margin corresponding to the switch operation mode according to the amplitude and the GIS rated lightning impulse withstand voltage, the calculation formula is:

[0049]

[0050] In the formula, safe i and U i are respectively the insulation margin and the very fast transient overvoltage amplitude under the i-th switch operation mode, and U e is the GIS rated lightning impulse withstand voltage.

[0051] In this preferred embodiment, U e is the GIS rated lightning impulse withstand voltage, which is generally set to 2400 kV.

[0052] In step 104, according to the insulation margin and the custom margin threshold, the switch layout result of the proposed UHV substation is determined, and the switch layout result includes installing damping resistors on the disconnect switches and canceling the installation of damping resistors on the disconnect switches.

[0053] Preferably, determining the switch layout result of the proposed UHV substation according to the insulation margin and the custom margin threshold includes:

[0054] When the insulation margins of all switch operation modes are greater than the user-defined margin threshold, it is determined that the switch layout result of the proposed UHV substation is to cancel the installation of damping resistors for disconnectors; otherwise, the switch layout result of the proposed UHV substation is to install damping resistors for disconnectors.

[0055] In this preferred embodiment, the margin threshold is generally set to 15%. When the insulation margins under some disconnector operation modes do not meet the requirement of being greater than 15%, it is considered that canceling the installation of damping resistors for disconnectors cannot effectively suppress VFTO. Therefore, only damping resistors can be installed. On the contrary, the installation of damping resistors can be canceled.

[0056] Preferably, the method further includes evaluating the safety performance of the main equipment of the UHV substation according to the insulation margin. Among them, when the insulation margin is greater than the margin threshold, it is determined that the safety performance of the main equipment meets the standard; otherwise, it does not meet the standard.

[0057] The method for determining the switch layout of the UHV substation based on VFTO simulation calculation described in this preferred embodiment can calculate the electromagnetic transient characteristics of the UHV substation in the frequency range from dozens of Hz to dozens of MHz by establishing an electromagnetic transient simulation model of the proposed UHV substation, covering most of the equivalent frequency ranges of transient overvoltages, and can provide strong support for the broadband electromagnetic transient simulation of the AC system. Further, the preliminary design scheme of the UHV part can also be optimized through the simulation calculation evaluation method to determine the layout of the disconnectors in the substation. Moreover, when optimizing the layout of the disconnectors through the established model, the overvoltage amplitudes of each main equipment in the substation, especially the winding equipment, and the insulation margin of the main equipment determined based on the overvoltage amplitudes can be obtained intuitively, so as to evaluate the safety performance of the main equipment of the UHV substation.

[0058] Exemplary apparatus

[0059] Figure 3 It is a schematic structural diagram of a device for determining the switch layout of a UHV substation based on VFTO simulation calculation according to a preferred embodiment of the present invention. As Figure 3 shown, the device 300 for determining the switch layout of a UHV substation based on VFTO simulation calculation described in this preferred embodiment includes:

[0060] A model establishment module 301, configured to establish an electromagnetic simulation transient model of the substation according to the design drawings of the proposed UHV substation, customize the table of equipment inlet capacitance values and the table of element equivalent circuit relationships;

[0061] An amplitude calculation module 302, configured to make the corresponding switches act based on the customized substation switch operation mode table according to the selected switch operation mode, and simulate and calculate the amplitude of the very fast transient overvoltage of the main equipment of the substation after the switches act;

[0062] A margin calculation module 303, configured to calculate the insulation margin corresponding to the switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS;

[0063] A result output module 304, configured to determine the switch layout result of the planned UHV substation according to the insulation margin and the custom margin threshold, where the switch layout result includes adding damping resistors to disconnectors and canceling the installation of damping resistors for disconnectors.

[0064] Preferably, the model establishment module 301 establishes an electromagnetic simulation transient model of the substation according to the design drawings of the planned UHV substation, a custom equipment inlet capacitance value table, and a component equivalent circuit relationship table, including:

[0065] Calculating and determining the distances between the devices in the planned UHV substation according to the design drawings of the planned UHV substation;

[0066] Based on the custom equipment inlet capacitance value table, determining the inlet capacitance values corresponding to the devices in the planned UHV substation;

[0067] Based on the custom component equivalent circuit table, determining the equivalent circuits of the components in the planned UHV substation;

[0068] Generating an electromagnetic simulation transient model of the planned UHV substation according to the distances between the devices in the planned UHV substation, the inlet capacitance values corresponding to the devices, and the equivalent circuits of the components.

[0069] Preferably, the amplitude calculation module 302, based on the custom substation switch operation mode table, makes the corresponding switch act according to the selected switch operation mode, and the amplitude of the very fast transient overvoltage of the main equipment of the substation after the switch action is simulated and calculated, which means that when the residual DC voltage on the load side is not less than the custom voltage threshold, based on the custom substation switch operation mode table, the corresponding switch acts according to the selected switch operation mode, and after the peak-to-peak pre-breakdown occurs between the contacts, the amplitude of the very fast transient overvoltage of the main equipment of the planned UHV substation is simulated and calculated.

[0070] Preferably, the margin calculation module 303 calculates the insulation margin corresponding to the switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS, and its calculation formula is:

[0071]

[0072] In the formula, safe i and U i are the insulation margin and the amplitude of the very fast transient overvoltage under the i-th switch operation mode respectively, and U e is the rated lightning impulse withstand voltage of the GIS.

[0073] Preferably, the result output module 304 determines the switch layout result of the proposed UHV substation according to the insulation margin and the custom margin threshold, including:

[0074] When the insulation margins of all switch operation modes are greater than the custom margin threshold, it is determined that the switch layout result of the proposed UHV substation is to cancel the installation of damping resistors for disconnectors; otherwise, the switch layout result of the proposed UHV substation is to install damping resistors for disconnectors.

[0075] Preferably, the device further includes a safety assessment module for assessing the safety performance of the main equipment of the UHV substation according to the insulation margin. Among them, when the insulation margin is greater than the margin threshold, it is determined that the safety performance of the main equipment meets the standard; otherwise, it does not meet the standard.

[0076] The device for determining the switch layout of a UHV substation based on VFTO simulation calculation according to the preferred embodiment of the present invention establishes an electromagnetic simulation transient model of the proposed UHV substation, simulates and calculates the overvoltage amplitude under various switch operation modes, and the insulation margin corresponding to the operation mode, so as to determine the steps of the switch layout result of the substation operation switch are the same as those of the method for determining the switch layout of a UHV substation based on VFTO simulation calculation described in the present invention, and the achieved technical effects are also the same, which will not be elaborated here.

[0077] Exemplary electronic device

[0078] Figure 4 It is a schematic structural diagram of an electronic device according to a preferred embodiment of the present invention. The electronic device can be any one or both of the first device and the second device, or a stand-alone device independent of them. The stand-alone device can communicate with the first device and the second device to receive the input signals collected from them. Figure 4 It illustrates a block diagram of an electronic device according to an embodiment of the present disclosure. As Figure 4 shown, the electronic device includes one or more processors 401 and a memory 402.

[0079] The processor 401 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions.

[0080] The memory 402 may include one or more computer program products, and the computer program products 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 (RAL) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROL), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage media, and the processor 401 may run the program instructions to implement the energy consumption anomaly diagnosis method based on the enterprise energy consumption space of the disclosed various embodiments above and / or other desired functions. In one example, the electronic device may further include: an input device 403 and an output device 404, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0081] In addition, the input device 403 may further include, for example, a keyboard, a mouse, and so on.

[0082] The output device 404 may output various information to the outside. The output device 404 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0083] Of course, for simplicity, Figure 4 only some of the components related to the present disclosure in the electronic device are shown, and components such as a bus, an input / output interface, and so on are omitted. In addition, according to specific application scenarios, the electronic device may further include any other appropriate components.

[0084] Exemplary computer program product and computer-readable storage medium

[0085] In addition to the above methods and devices, the embodiments of the present disclosure may also be a computer program product, which includes computer program instructions, and when the computer program instructions are run by a processor, the processor is caused to execute the steps in the method for determining the switch arrangement of a UHV substation based on VFTO simulation calculation according to various embodiments of the present disclosure described in the "Exemplary Method" section above of this specification.

[0086] The computer program product may be written in any combination of one or more programming languages for programming code to perform the operations of the embodiments of the present disclosure. The programming languages include object-oriented programming languages, such as Java, C++, etc., and also include conventional procedural programming languages, such as the "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0087] In addition, an embodiment of the present disclosure may also be a computer-readable storage medium storing computer program instructions, which, when run by a processor, cause the processor to execute the steps in the method for determining the switch arrangement of a UHV substation based on VFTO simulation calculation according to various embodiments of the present disclosure described in the "Exemplary Method" section above of this specification.

[0088] The computer-readable storage medium may adopt any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAL), a read-only memory (ROL), an erasable programmable read-only memory (EPROL or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROL), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0089] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present disclosure. In addition, the above-described specific details are only for illustrative and easy-to-understand purposes and are not limitations. The above details do not limit the present disclosure to necessarily adopt the above specific details for implementation.

[0090] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and reference can be made to the partial description of the method embodiment for the relevant parts.

[0091] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present disclosure are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with each other.

[0092] The apparatus and method of the present disclosure can be implemented in many ways. For example, the apparatus and method of the present disclosure can be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of the steps for the method is only for illustration, and the steps of the method of the present disclosure are not limited to the specific order described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0093] It should also be noted that in the apparatus, device, and method of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present disclosure. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects are very obvious 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 present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0094] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A method for determining the layout of switches in a UHV substation based on VFTO simulation calculation, characterized in that: The method comprises: According to the design drawings of the proposed UHV substation, the equipment inlet capacitance value table and component equivalent circuit relationship table are customized to establish the substation electromagnetic simulation transient model; Based on the user-defined substation switch operation mode table, the corresponding switch is operated according to the selected switch operation mode, and the amplitude of the ultra-fast transient overvoltage of the substation main equipment after the switch operation is simulated and calculated; Calculate the insulation margin corresponding to the switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS; The switch arrangement result of the proposed UHV substation is determined according to the insulation margin and the user-defined margin threshold, and the switch arrangement result includes adding damping resistors to the disconnecting switches and removing damping resistors from the disconnecting switches.

2. The method according to claim 1, characterized in that According to the design drawings of the proposed UHV substation, a customized equipment inlet capacitance value table and a component equivalent circuit relationship table are used to establish a substation electromagnetic simulation transient model, including: According to the design drawings of the proposed UHV substation, calculate and determine the distance between the equipment in the proposed UHV substation; Based on the custom equipment inlet capacitance value table, determine the corresponding inlet capacitance value of each equipment in the proposed UHV substation; Based on the user-defined component equivalent circuit table, determine the equivalent circuit of each component in the proposed UHV substation; According to the distance between the equipment in the proposed UHV substation, the corresponding inlet capacitance value of each equipment and the equivalent circuit of each component, the electromagnetic simulation transient model of the proposed UHV substation is generated.

3. The method according to claim 1, characterized in that The method of operating the corresponding switch according to the selected switch operation mode based on the user-defined substation switch operation mode table, and simulating and calculating the amplitude of the ultra-fast transient overvoltage of the main equipment of the substation after the switch operation is to simulate and calculate the amplitude of the ultra-fast transient overvoltage of the main equipment of the proposed ultra-high voltage substation after the peak-to-peak value pre-breakdown occurs between the contacts, by operating the corresponding switch according to the selected switch operation mode based on the user-defined substation switch operation mode table when the residual DC voltage on the load side is not less than the user-defined voltage threshold.

4. The method according to claim 1, characterized in that: The insulation margin corresponding to the switch operation mode is calculated according to the amplitude and the rated lightning impulse withstand voltage of GIS, and the calculation formula is: In the formula, safe i and U i are the insulation margin and ultra-fast transient overvoltage amplitude under the i-th switch operation mode, U e Rated lightning impulse withstand voltage of GIS.

5. The method according to claim 1, characterized in that The step of determining the switch arrangement result of the proposed UHV substation according to the insulation margin and the custom margin threshold comprises: When the insulation margins of all switch operation modes are greater than the custom margin threshold, the switch arrangement result of the proposed UHV substation is determined to cancel the installation of damping resistors for the disconnectors; otherwise, the switch arrangement result of the proposed UHV substation is to add damping resistors to the disconnectors.

6. The method according to claim 1, characterized in that The method also includes evaluating the safety performance of the UHV station main equipment according to the insulation margin, wherein when the insulation margin is greater than a margin threshold, it is determined that the safety performance of the main equipment meets the standard, otherwise, it does not meet the standard.

7. A device for determining the layout of switches in a UHV substation based on VFTO simulation calculation, characterized in that: The device comprises: The model building module is used to build a substation electromagnetic simulation transient model based on the design drawings of the proposed UHV substation, custom equipment inlet capacitance value table and component equivalent circuit relationship table; Amplitude calculation module, used to operate the corresponding switch according to the selected switch operation mode based on the self-defined substation switch operation mode table, and simulate and calculate the amplitude of the ultra-fast transient overvoltage of the main equipment of the substation after the switch operation; A margin calculation module, used to calculate the insulation margin of the corresponding switch operation mode according to the amplitude and the rated lightning impulse withstand voltage of the GIS; The result output module is used to determine the switch layout result of the proposed ultra-high voltage substation according to the insulation margin and the custom margin threshold, and the switch layout result includes the installation of damping resistors on the disconnector and the removal of damping resistors on the disconnector.

8. The device according to claim 7, characterized in that The device also includes a safety assessment module, which is used to evaluate the safety performance of the UHV station main equipment according to the insulation margin, wherein when the insulation margin is greater than a margin threshold, it is determined that the safety performance of the main equipment meets the standard, otherwise, it does not meet the standard.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 7.

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