Method and system for determining corona current pulse attenuation law of overhead transmission line

Abstract

The invention discloses a method and system for determining a corona current pulse attenuation rule of an overhead transmission line, and belongs to the technical field of high voltage. The method comprises the steps that a simulation model is built in advance according to overhead power transmission parameters for an overhead power transmission line; using a pre-built simulation model to simulate a propagation rule of corona current of the overhead transmission lines with different lengths, and obtaining a simulation result of the propagation rule; and according to the simulation result, determining the attenuation law along the corona current pulse under the high-voltage overhead transmission line. The method overcomes the defects that an existing method relates to a large number of matrix transformation and line parameter solution and only carries out calculation for a single frequency point, and is simple and practical for accurately obtaining the attenuation under the corona current pulse time domain under an actual line.

Description

Technical Field

[0001] The present invention relates to the field of high voltage technology, and more particularly to a method and system for determining a corona current pulse attenuation law of an overhead transmission line. Background Art

[0002] Corona discharge on high-voltage transmission lines can have a range of environmental impacts, the most significant of which is radio interference. If not properly controlled, it can interfere with nearby radio stations, navigation equipment, and television reception, severely impacting the surrounding electromagnetic environment. Radio interference has always been a key consideration in the conductor design of ultra-high and ultra-high voltage transmission lines. Radio interference is caused by randomly generated corona pulse currents on the conductors. When corona discharge occurs on a line, the corona pulse current flows along the conductor. Only by understanding the distribution of the corona pulse current along the line can the radio interference field strength distribution at different locations be accurately calculated.

[0003] In theory, the propagation of corona pulse current on transmission lines follows transmission line theory. In multi-conductor conditions, decoupling is typically performed using a mode transformation matrix, followed by repeated calculations of the attenuation coefficient using a single-conductor system approach. However, this approach involves extensive line parameter calculations and complex matrix transformations, such as calculating line impedance and admittance in multi-conductor systems, as well as operations involving the mode transformation matrix. For practical engineering applications, a simpler method is needed to obtain the corresponding attenuation law. Currently, few studies in the literature have simplified this approach. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a method for determining the attenuation law of corona current pulses of overhead transmission lines, comprising:

[0005] For overhead transmission lines, a simulation model is pre-built based on overhead transmission parameters;

[0006] Use a pre-built simulation model to simulate the propagation of corona currents in overhead transmission lines of different lengths and obtain simulation results of the propagation law;

[0007] Based on the simulation results, the attenuation law of the corona current pulse along the high-voltage overhead transmission line is determined.

[0008] Optional, simulation model including:

[0009] Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

[0010] Optional, pre-built simulation model including:

[0011] Based on overhead transmission parameters, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained;

[0012] Based on the double exponential model of the surge module of ATP-EMTP, a positive corona pulse current source model and a negative corona pulse current source model are established according to the positive corona current pulse waveform and the negative corona current pulse waveform respectively;

[0013] Based on the Jmarti model of the LCC line module of ATP-EMTP, an overhead transmission line simulation model is established according to the high-voltage overhead transmission line parameters.

[0014] Optionally, the positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

[0015] Optional parameters of high-voltage overhead transmission lines, including: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines above the ground, ground wire spacing, height of ground wire above the ground, soil resistivity, and tower grounding resistance.

[0016] Optionally, simulate the propagation of corona currents along overhead transmission lines of varying lengths and obtain simulation results, including:

[0017] Simulate the propagation of corona current in overhead transmission lines of different lengths. Using the preset ATP-EMTP calculation step size, calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths.

[0018] According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows:

[0019] Att=20×lg(A0-A L )

[0020] Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude;

[0021] A curve is drawn according to the Att, and the curve is drawn as the simulation result.

[0022] In another aspect, the present invention further provides a system for determining a corona current pulse decay law of an overhead transmission line, comprising:

[0023] Initial unit, used to pre-build simulation models for overhead transmission lines based on overhead transmission parameters

[0024] A simulation unit is used to simulate the propagation law of corona current in overhead transmission lines of different lengths using a pre-built simulation model and obtain simulation results of the propagation law;

[0025] The output unit is used to determine the attenuation law of the corona current pulse along the high-voltage overhead transmission line according to the simulation results.

[0026] Optional, simulation model including:

[0027] Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

[0028] Optional, pre-built simulation model including:

[0029] Based on overhead transmission parameters, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained;

[0030] Based on the double exponential model of the surge module of ATP-EMTP, a positive corona pulse current source model and a negative corona pulse current source model are established according to the positive corona current pulse waveform and the negative corona current pulse waveform respectively;

[0031] Based on the Jmarti model of the LCC line module of ATP-EMTP, an overhead transmission line simulation model is established according to the high-voltage overhead transmission line parameters.

[0032] Optionally, the positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

[0033] Optional parameters of high-voltage overhead transmission lines, including: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines above the ground, ground wire spacing, height of ground wire above the ground, soil resistivity, and tower grounding resistance.

[0034] Optionally, simulate the propagation of corona currents along overhead transmission lines of varying lengths and obtain simulation results, including:

[0035] Simulate the propagation of corona current in overhead transmission lines of different lengths. Using the preset ATP-EMTP calculation step size, calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths.

[0036] According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows:

[0037] Att=20×lg(A0-A L )

[0038] Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude;

[0039] A curve is drawn according to the Att, and the curve is drawn as the simulation result.

[0040] In yet another aspect, the present invention further provides a computing device comprising: one or more processors;

[0041] a processor for executing one or more programs;

[0042] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0043] In 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.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention provides a method for determining the attenuation law of corona current pulses in overhead transmission lines, comprising: pre-building a simulation model for the overhead transmission line according to overhead transmission parameters; using the pre-built simulation model to simulate the propagation law of corona currents in overhead transmission lines of different lengths to obtain simulation results of the propagation law; and determining, based on the simulation results, the attenuation law of corona current pulses along the high-voltage overhead transmission line.

[0046] The present invention overcomes the shortcomings of current methods involving a large number of matrix transformations and line parameter solutions, as well as only calculating a single frequency point, and provides a simple and practical method for accurately obtaining the attenuation of corona current pulses in the time domain under actual lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a flow chart of the method of the present invention;

[0048] Figure 2 is a flow chart of an embodiment of the method of the present invention;

[0049] Figure 3 This is a typical positive current pulse time domain waveform diagram of an embodiment of the method of the present invention;

[0050] Figure 4 Dimensional drawing of a 1000kV double-circuit transmission line on the same tower according to an embodiment of the method of the present invention;

[0051] Figure 5 This is a graph showing the attenuation of the positive corona current pulse under different L values in accordance with an embodiment of the method of the present invention;

[0052] Figure 6 This is an average trend diagram of attenuation based on high-voltage and ultra-high-voltage line test results according to an embodiment of the method of the present invention;

[0053] Figure 7 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0054] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0055] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that 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.

[0056] Example 1:

[0057] The present invention proposes a method for determining the decay law of corona current pulses in overhead transmission lines, such as Figure 1 Shown, including:

[0058] Step 1: For overhead transmission lines, a simulation model is pre-built according to overhead transmission parameters;

[0059] Step 2: Use a pre-built simulation model to simulate the propagation law of corona current in overhead transmission lines of different lengths and obtain simulation results of the propagation law;

[0060] Step 3: Determine the attenuation law of the corona current pulse along the high-voltage overhead transmission line based on the simulation results.

[0061] Among them, the simulation model includes:

[0062] Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

[0063] For overhead transmission lines, a simulation model is pre-built, including:

[0064] Based on the overhead transmission line, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained;

[0065] Based on the double exponential model of the surge module of ATP-EMTP, a positive corona pulse current source model and a negative corona pulse current source model are established according to the positive corona current pulse waveform and the negative corona current pulse waveform respectively;

[0066] Based on the Jmarti model of the LCC line module of ATP-EMTP, an overhead transmission line simulation model is established according to the high-voltage overhead transmission line parameters.

[0067] Among them, the positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

[0068] Among them, the parameters of high-voltage overhead transmission lines include: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines to the ground, ground wire spacing, height of ground wire to the ground, soil resistivity and tower grounding resistance.

[0069] Among them, the propagation of corona current in overhead transmission lines of different lengths is simulated, and simulation results are obtained, including:

[0070] Simulate the propagation of corona current in overhead transmission lines of different lengths. Using the preset ATP-EMTP calculation step size, calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths.

[0071] According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows:

[0072] Att=20×lg(A0-A L )

[0073] Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude;

[0074] A curve is drawn according to the Att, and the curve is drawn as the simulation result.

[0075] The present invention will be further described below with reference to specific cases:

[0076] Case steps such as Figure 2 Shown, including:

[0077] Step 1: Determine the positive corona current pulse waveform, which is usually a double exponential function waveform with a pulse amplitude of A0.

[0078] Step 2: Obtain the parameters of the high-voltage overhead transmission line, including the number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines above the ground, ground wire spacing, ground wire height above the ground, soil resistivity, and tower grounding resistance.

[0079] Step 3: Use the Jmarti model of the LCC line module of ATP-EMTP to establish an overhead transmission line simulation model;

[0080] Step 4: Use the double exponential model of the surge module of ATP-EMTP to establish a positive corona pulse current source model;

[0081] Step 5: Simulate overhead transmission lines L of different lengths as needed;

[0082] Step 6: Select an appropriate ATP-EMTP calculation step size, usually between 1 ns and 10 ns;

[0083] Step 7: Calculate the positive corona current pulse amplitude A at the line terminal under different L conditions L ;

[0084] Step 8: Convert the attenuation to decibels using the following formula:

[0085] Att = 20×lg(A0-A L ) (1)

[0086] Step 9: Draw the curves of Att under different L to obtain the attenuation law of the positive corona current pulse along the high-voltage overhead transmission line.

[0087] Step 10: Determine the negative corona current pulse waveform;

[0088] Step 11: Repeat steps 4 to 9 to obtain the attenuation law of the negative corona current pulse along the high-voltage overhead transmission line.

[0089] The propagation patterns of high-frequency corona pulse currents on multi-conductor transmission lines typically require decoupling using a mode transformation matrix, followed by repeated calculation of the attenuation coefficient using a single-conductor system approach. This involves numerous line parameter calculations and complex matrix transformations. For practical engineering applications, a simpler method is needed to obtain the corresponding attenuation patterns. Currently, few studies have simplified this approach.

[0090] This paper uses the open-source electromagnetic transient calculation program ATP-EMTP to establish the JMartin model and surge pulse current source for actual high-voltage overhead transmission lines in a simple procedure. This simulation then derives the corona current pulse attenuation for different line lengths. This method overcomes the shortcomings of existing methods, which involve extensive matrix transformations and line parameter solutions, as well as calculations based solely on a single frequency point. It provides a simple and practical method for accurately determining the time-domain attenuation of corona current pulses in actual lines. This method is beneficial for further evaluating the electromagnetic interference level generated by corona discharge in high-voltage overhead transmission lines.

[0091] The following is an example to illustrate:

[0092] By referring to relevant literature, the typical positive corona current pulse time domain waveform is obtained as the following double exponential function:

[0093] i + (t) = 2.7312×A0×(e -0.01214t -e -0.03508t ) (1)

[0094] Where A0 = 20mA, the unit of t is ns, and the waveform is as follows Figure 3 shown.

[0095] Step 2: Obtain the parameters of a 1000kV double-circuit transmission line on the same tower. The line uses ACSR 8×LGJ-630 / 45, with 8 splits and a split spacing of 400mm. The ground wire uses ACSR LBGJ-240-20AC. The tower grounding resistance is 10Ω, the soil resistivity is 100Ω·m, and the average height of the line relative to the ground is 30m. Other dimensions are as follows: Figure 4 shown.

[0096] Step 3: Establish the overhead transmission line using the Jmarti model of the LCC line module of ATP-EMTP;

[0097] Step 4: Use the double exponential model of the surge module of ATP-EMTP to establish a positive corona pulse current source model;

[0098] Step 5: Simulate overhead transmission lines of different lengths L = 0 to 40 km;

[0099] Step 6: The ATP-EMTP calculation step size is 10 ns;

[0100] Step 7: Calculate the positive corona current pulse amplitude A at the line terminal under different L conditions L ;

[0101] Step 8: Convert the attenuation to decibels using the following formula:

[0102] Att = 20×lg(A0-A L ) (1)

[0103] Step 9: Draw the curve of Att under different L, such as Figure 5 As shown in Figure 3, the attenuation law of the positive corona current pulse along the high-voltage overhead transmission line is obtained.

[0104] In order to verify whether the calculation is correct, the average trend of attenuation based on the experimental results of high-voltage and ultra-high-voltage lines is referred to, such as Figure 6 As shown. Figure 5 and Figure 6 It can be seen that the attenuation curve obtained by the present invention is consistent with the measured result, which shows that the present invention is effective and simpler.

[0105] Example 2:

[0106] The present invention also provides a system 200 for determining the decay law of corona current pulses in overhead transmission lines, such as Figure 7 Shown, including:

[0107] Initial unit 201 is used to pre-build a simulation model for overhead transmission lines based on overhead transmission parameters

[0108] The simulation unit 202 is used to simulate the propagation law of the corona current of overhead transmission lines of different lengths using a pre-built simulation model and obtain simulation results of the propagation law;

[0109] The output unit 203 is used to determine the attenuation law of the corona current pulse along the high-voltage overhead transmission line according to the simulation result.

[0110] Among them, the simulation model includes:

[0111] Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

[0112] Among them, the simulation model is pre-built, including:

[0113] Based on overhead transmission parameters, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained;

[0114] Based on the double exponential model of the surge module of ATP-EMTP, a positive corona pulse current source model and a negative corona pulse current source model are established according to the positive corona current pulse waveform and the negative corona current pulse waveform respectively;

[0115] Based on the Jmarti model of the LCC line module of ATP-EMTP, an overhead transmission line simulation model is established according to the high-voltage overhead transmission line parameters.

[0116] Among them, the positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

[0117] Among them, the parameters of high-voltage overhead transmission lines include: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines to the ground, ground wire spacing, height of ground wire to the ground, soil resistivity and tower grounding resistance.

[0118] Among them, the propagation of corona current in overhead transmission lines of different lengths is simulated, and simulation results are obtained, including:

[0119] Simulate the propagation of corona current in overhead transmission lines of different lengths. Using the preset ATP-EMTP calculation step size, calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths.

[0120] According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows:

[0121] Att=20×lg(A0-A L )

[0122] Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude;

[0123] A curve is drawn according to the Att, and the curve is drawn as the simulation result.

[0124] The present invention overcomes the shortcomings of current methods involving a large number of matrix transformations and line parameter solutions, as well as only calculating a single frequency point, and provides a simple and practical method for accurately obtaining the attenuation of corona current pulses in the time domain under actual lines.

[0125] Example 3:

[0126] 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 may be 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., which are the computing core and control core of the terminal, which is suitable for implementing one or more instructions, 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.

[0127] Example 4:

[0128] 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 can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. 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.

[0129] It will be understood by those skilled in the art that the 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. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0130] 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 flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 flowcharts and / or block diagrams. 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.

[0131] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0132] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0133] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional 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.

[0134] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for determining the decay law of corona current pulses in overhead transmission lines, characterized in that: include: For overhead transmission lines, a simulation model is pre-built based on overhead transmission parameters; Use a pre-built simulation model to simulate the propagation of corona currents in overhead transmission lines of different lengths and obtain simulation results of the propagation law; Based on the simulation results, the attenuation law of the corona current pulse along the high-voltage overhead transmission line is determined.

2. The method according to claim 1, characterized in that The simulation model comprises: Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

3. The method according to claim 1, characterized in that ,,Pre-built simulation model, including: Based on overhead transmission parameters, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained; According to the positive corona current pulse waveform and the negative corona current pulse waveform, a positive corona pulse current source model and a negative corona pulse current source model are respectively established; An overhead transmission line simulation model is established based on the high-voltage overhead transmission line parameters.

4. The method according to claim 3, characterized in that The positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

5. The method according to claim 3, characterized in that The parameters of the high-voltage overhead transmission line include: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines above the ground, ground wire spacing, ground wire height above the ground, soil resistivity and tower grounding resistance.

6. The method according to claim 1, characterized in that The method of simulating the propagation of corona currents in overhead transmission lines of different lengths and obtaining simulation results includes: Simulate the propagation of corona current in overhead transmission lines of different lengths, calculate the step size, and calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths; According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows: At=20×lg(A0-A L ) Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude; A curve is drawn according to the Att, and the curve is drawn as the simulation result.

7. A system for determining the decay law of corona current pulses in overhead transmission lines, characterized in that: include: Initial unit, used to pre-build simulation models for overhead transmission lines based on overhead transmission parameters A simulation unit is used to simulate the propagation law of corona current in overhead transmission lines of different lengths using a pre-built simulation model and obtain simulation results of the propagation law; The output unit is used to determine the attenuation law of the corona current pulse along the high-voltage overhead transmission line according to the simulation results.

8. The system according to claim 7, characterized in that The simulation model comprises: Overhead transmission line simulation model, positive corona pulse current source model and negative corona pulse current source model.

9. The system according to claim 7, wherein: Pre-built simulation model, including: Based on overhead transmission parameters, the positive corona current pulse waveform, the negative corona current pulse waveform and the high-voltage overhead transmission line parameters of the overhead transmission line are obtained; Based on the double exponential model of the surge module of ATP-EMTP, a positive corona pulse current source model and a negative corona pulse current source model are established according to the positive corona current pulse waveform and the negative corona current pulse waveform respectively; Based on the Jmarti model of the LCC line module of ATP-EMTP, an overhead transmission line simulation model is established according to the high-voltage overhead transmission line parameters.

10. The system according to claim 9, characterized in that The positive corona current pulse waveform and the negative corona current pulse waveform are double exponential function waveforms.

11. The system according to claim 9, wherein: The parameters of the high-voltage overhead transmission line include: line length, number of split conductors, split radius, sub-conductor radius, ground wire radius, horizontal spacing between phase lines, average height of phase lines above the ground, ground wire spacing, ground wire height above the ground, soil resistivity and tower grounding resistance.

12. The system according to claim 9, wherein: The method of simulating the propagation of corona currents in overhead transmission lines of different lengths and obtaining simulation results includes: Simulate the propagation of corona current in overhead transmission lines of different lengths. Using the preset ATP-EMTP calculation step size, calculate the positive / negative corona current pulse amplitude at the terminal of the high-voltage transmission line at different lengths. According to the amplitude of the positive / negative corona current pulse, the attenuation of the positive / negative corona current pulse is converted into decibels, and the formula is as follows: At=20×lg(A0-A L ) Among them, Att is decibel, A0 is the initial pulse amplitude, A L is the terminal pulse amplitude; A curve is drawn according to the Att, and the curve is drawn as the simulation result.

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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