Modeling and simulation analysis method for three-stranded-wire electromagnetic pulse coupling response

Abstract

The invention discloses a three-stranded-wire electromagnetic pulse coupling response modeling and simulation analysis method, and relates to the technical field of transmission line simulation in an electromagnetic environment, and the method comprises the steps: building a three-stranded-wire-based parameter and a corresponding three-stranded-wire three-dimensional structure model; obtaining three-stranded wire attribute parameters and an application scene to construct a cable library model; determining a use scene, an erection condition and a position coordinate of the three-stranded wire; forming a stranded wire laying path according to the position coordinates of the three stranded wires and the erection conditions; obtaining electromagnetic environment related parameters required by simulation; setting model ground attributes and boundary conditions according to the environmental parameters; setting an excitation source input form, a pulse propagation direction and an electric field direction in electromagnetic simulation software according to the electromagnetic pulse parameters; completing three-dimensional modeling of the three-stranded wire according to the parameters; designing an equivalent circuit according to the twisted wire model schematic diagram, and arranging terminal pin positions; setting an equivalent circuit grounding mode and a load; three-dimensional model grid division is completed, and grid calculation solving requirements are met; a transient simulation task is established, a simulation frequency range is determined, and a solving mode is field-circuit co-simulation; simulation parameters are set, a stranded wire coupling simulation result is obtained by changing parameter variables in the joint simulation model and detecting electric signals at the load end of the model, and the parameter change influence condition is analyzed according to the coupling change rule.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission line simulation in an electromagnetic environment, and relates to a method for modeling and simulating the electromagnetic pulse coupling response of a three-strand wire. Background Art

[0002] With the intelligent development of electronic devices and the widespread popularity of wireless communication technologies, the electromagnetic interference of the external electromagnetic environment on various electronic and electrical devices has become increasingly serious. In addition to the nuclear electromagnetic pulse (NEMP) generated by nuclear explosions, the high-power microwave (HPM) and ultra-wideband (UWB) electromagnetic pulses generated by high-power pulse source radiation, there is also the lightning electromagnetic pulse (LEMP) generated by common lightning. Therefore, it is very important to reduce the coupling interference of the complex electromagnetic environment on the transmitted signal or energy and ensure the normal operation of the device and the transmission path.

[0003] As a basic transmission medium for transmitting signals and energy, cables are widely used in power transmission, communication, industry and other fields, and are an important part of modern national infrastructure. Among them, stranded wires are often used in power transmission, network communication and other fields in engineering due to their advantages such as low cost, high strength and strong anti-interference ability. Common simulation models for studying the coupling response of stranded wires include: lumped parameter models, field-circuit combined simulation models and transmission line models. Electromagnetic simulation software often uses the field-circuit combined simulation model. Its core principle is to combine electromagnetic field simulation and circuit simulation, and use numerical methods such as the finite integration method (FIT) and the transmission line matrix method (TLM) to calculate the electromagnetic characteristics of the cable. Create a cable model through a modeling tool according to the structure and material properties of the cable, convert the three-dimensional cable model into an equivalent circuit schematic diagram, and perform time-domain and frequency-domain simulation in the solver.

[0004] Compared with traditional twisted pairs, three-strand wires have a longer transmission distance, better stability and stronger anti-interference ability, so they are used as a high-quality transmission cable. In order to analyze the electromagnetic pulse coupling response problem of three-strand wires, the field-circuit combined simulation model can be used to accurately calculate the coupling response results at the load of three-strand wires and shorten the operation time. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for modeling and simulating the electromagnetic pulse coupling response of a three-strand wire aiming at the coupling interference problem of a three-strand wire in an electromagnetic environment.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A modeling and simulation analysis method for the electromagnetic pulse coupling response of a three-strand wire, comprising:

[0008] Step 1: Obtain the relevant parameters of the three-strand wire for constructing a three-strand wire cable model;

[0009] Step 2: Determine the type and position coordinates of the three-strand wire according to the cable usage scenario and erection conditions;

[0010] Step 3: Obtain the relevant parameters of the electromagnetic environment according to the external environment where the three-strand wire is located;

[0011] Step 4: Set the property parameters of the model floor according to the environmental parameters;

[0012] Step 5: Set the excitation source parameters and the incident plane wave direction according to the electromagnetic pulse excitation source in the electromagnetic environment;

[0013] Step 6: Complete the modeling operations in Steps 1 to 5 to obtain a three-dimensional simulation model of the three-strand wire and complete the model mesh division;

[0014] Step 7: Arrange the positions of the cable pins according to the schematic diagram of the three-strand wire model, and set the terminal load and grounding method;

[0015] Step 8: Perform simulation settings on the co-simulation model, establish a transient simulation task and set the parameters;

[0016] Step 9: Detect the electrical signal at the load end of the model by changing the parameter variables in the co-simulation model; according to the coupling simulation results of the three-strand wire, obtain the analysis of the coupling change law and the influence of parameter changes.

[0017] Further, in Step 1, the relevant parameters of the three-strand wire include structural parameters, electrical parameters, and application parameters. The structural parameters include conductor material and diameter, insulator material and thickness, twist angle, and arc length; the electrical parameters include strand resistance, capacitance, inductance, and impedance; the application parameters include rated voltage, current, and frequency range.

[0018] The twist angle of the three-strand wire is expressed as

[0019]

[0020] where s is the distance between the strand and the origin, and p is the pitch of the three-strand wire;

[0021] The arc length is expressed as

[0022] l = 2πL / pα

[0023] where L is the length of the strand.

[0024] Furthermore, in step 2, the stranded wire types can be divided into bare stranded wires, insulated stranded wires, and shielded stranded wires according to the insulation type; the position coordinates include the cable starting coordinates, erection height, and stranded wire path trajectory.

[0025] Furthermore, in step 3, the electromagnetic environment related parameters include electromagnetic pulse parameters and space parameters; the electromagnetic pulse parameters include amplitude parameters, time parameters, frequency spectrum parameters, energy parameters, and source parameters; the space parameters include the spatial distribution of electromagnetic waves, propagation direction, and electric field polarization direction.

[0026] Furthermore, in step 4, the model floor attribute parameters include material attribute parameters, geometric attribute parameters, and electrical characteristic parameters; the material attribute parameters include conductivity, relative permittivity, and relative permeability; the geometric attribute parameters include floor size, floor shape, and floor thickness; the electrical characteristic parameters include grounding impedance and grounding method.

[0027] Furthermore, in step 5, the excitation source parameters include pulse waveform, pulse rise, fall time, and pulse width; the incident plane wave direction includes the incident wave propagation direction and polarization direction.

[0028] The incident plane wave is expressed as,

[0029]

[0030] where E is the incident electric field vector and E0 is the magnitude of the incident electric field;

[0031] The incident wave propagation direction is expressed as,

[0032]

[0033] where e x 、e y and e z are the incident electric field vectors, and θ p 、φ p and θ E are the incident wave pitch angle, azimuth angle, and polarization angle;

[0034] The incident wave propagation direction is expressed as,

[0035]

[0036] where k x 、k y and k Z are the wave number components.

[0037] Furthermore, in step 7, the terminal load is composed of resistors, inductors, capacitors, nonlinear devices, etc. connected in series and parallel; the grounding methods include direct grounding, indirect grounding, and shield grounding.

[0038] Further, in step 8, the transient simulation task is a field-circuit coupled simulation; the task parameters include the simulation frequency range, simulation time, and coupling ports.

[0039] Further, in step 9, the parameter variables of the simulation model include excitation source parameters, plane wave parameters, and stranded wire parameters. The plane wave parameters include elevation angle, azimuth angle, and polarization angle; the stranded wire parameters include stranded wire arc length, twist angle, rotation parameter, radius, length, height, load impedance, etc.

[0040] The beneficial effects of the present invention are as follows: The present invention provides a method for modeling and simulation analysis of the electromagnetic pulse coupling response of three stranded wires. Aiming at the coupling interference problem of three stranded wires in the electromagnetic environment, an electromagnetic simulation software is used to construct a stranded wire simulation model in the radiation environment. The actual stranded wire structure is simulated through three-dimensional modeling, and the influence of factors such as the electromagnetic pulse radiation environment and stranded wire parameters on the coupling response is calculated. Finally, the coupling laws of different factors on the coupling current and voltage are summarized. The present invention is conducive to deeply understanding the coupling path of three stranded wires, improving the anti-interference ability of the three-stranded wire structure, and reasonably planning the wiring pattern of three stranded wires. Description of the Drawings

[0041] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings, where:

[0042] Figure 1 is a flowchart for modeling and simulation of the electromagnetic pulse coupling response of three stranded wires;

[0043] Figure 2 is a schematic diagram of the cross-sectional coordinates of three stranded wires;

[0044] Figure 3 is a schematic diagram of the three-stranded wire three-helix structure model in an example of the present invention;

[0045] Figure 4 is a schematic diagram of the model of a uniform plane wave incident on three stranded wires in an example of the present invention;

[0046] Figure 5 is the electromagnetic pulse waveform diagram selected in an example of the present invention;

[0047] Figure 6 is the three-dimensional modeling diagram of three stranded wires in an example of the present invention;

[0048] Figure 7 is the circuit schematic diagram corresponding to the three-stranded wire model in an example of the present invention;

[0049] Figure 8 is the graph of the peak value change of current and voltage at the load in Experiment 1 in an example of the present invention;

[0050] Figure 9This is the current waveform diagram at the load under different electromagnetic pulse excitations in Experiment 2 of the present invention example. Detailed implementation manners

[0051] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0052] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "due north", "due south", "due east", "due west", "southeast", "northeast", "southwest", "northwest", etc. indicating the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0053] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation of the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0054] In Embodiment 1 of the present invention, aiming at the coupling response problem of three-strand wires under electromagnetic pulse irradiation, a modeling and simulation method as Figure 1 shown is proposed.

[0055] Referring to Figure 1 , this method includes:

[0056] Step 1: Obtain the relevant parameters of the three-strand wire for constructing the three-strand wire cable model;

[0057] Among them, the relevant parameters of the three-strand wire include structural parameters, electrical parameters and application parameters. The structural parameters include conductor material and diameter, insulator material and thickness, torsion angle, arc length; the electrical parameters include strand resistance, capacitance, inductance, impedance; the application parameters include rated voltage, current, frequency range.

[0058] As shown in Figure 2 the schematic diagram of the cross-sectional coordinates of the three-strand wire in

[0059]

[0060] where s is the distance between the stranded wire and the origin, and p is the pitch of the three-strand wire;

[0061] As shown in Figure 3 the schematic diagram of the three-helix structure model of the three-strand wire in

[0062] l = 2πL / pα

[0063] where L is the length of the stranded wire.

[0064] Step 2: Determine the type and position coordinates of the three-strand wire according to the cable usage scenario and erection conditions;

[0065] The stranded wire type can be divided into bare stranded wire, insulated stranded wire, and shielded stranded wire according to the insulation type; the position coordinates include the cable starting coordinates, erection height, and stranded wire path trajectory.

[0066] Step 3: Obtain the electromagnetic environment related parameters according to the external environment where the three-strand wire is located;

[0067] The electromagnetic environment related parameters include electromagnetic pulse parameters and space parameters; the electromagnetic pulse parameters include amplitude parameters, time parameters, frequency spectrum parameters, energy parameters, space parameters, and source parameters; the space parameters include the spatial distribution of electromagnetic waves, propagation direction, and electric field polarization direction.

[0068] Step 4: Set the model floor attribute parameters according to the environmental parameters;

[0069] The model floor attribute parameters include material attribute parameters, geometric attribute parameters, and electrical characteristic parameters; the material attribute parameters include conductivity, relative permittivity, and relative permeability; the geometric attribute parameters include floor size, floor shape, and floor thickness; the electrical characteristic parameters include grounding impedance and grounding method.

[0070] Step 5: Set the excitation source parameters and incident plane wave direction according to the electromagnetic pulse excitation source in the electromagnetic environment;

[0071] Among them, the excitation source parameters include pulse waveform, pulse rise, fall time, and pulse width; the incident plane wave direction includes the incident wave propagation direction and polarization direction.

[0072] The incident plane wave is expressed as

[0073]

[0074] Among them, E is the incident electric field vector, and E0 is the magnitude of the incident electric field;

[0075] The propagation direction of the incident wave is expressed as

[0076]

[0077] Among them, ex, ey, and ez are the incident electric field vectors, and θ p , φ p and θ E are the elevation angle, azimuth angle, and polarization angle of the incident wave;

[0078] The propagation direction of the incident wave is expressed as

[0079]

[0080] Among them, kx, ky, and kZ are the wave number components.

[0081] Step 6: Complete the modeling operations in Steps 1 to 5 to obtain a three-strand wire three-dimensional simulation model and complete the model mesh division;

[0082] Step 7: According to the schematic diagram of the three-strand wire model, arrange the positions of the cable pins and set the terminal load and grounding method; among them, the terminal load is composed of resistors, inductors, capacitors, nonlinear devices, etc. connected in series and parallel; the grounding methods include direct grounding, indirect grounding, and shielding grounding.

[0083] Step 8: Perform simulation settings on the co-simulation model, establish a transient simulation task and set parameters; among them, the transient simulation task is a field-circuit co-simulation; the task parameters include the simulation frequency range, simulation time, and coupling ports.

[0084] Step 9: By changing the parameter variables in the co-simulation model, detect the electrical signals at the load end of the model; according to the three-strand wire coupling simulation results, obtain the analysis of the coupling change law and the influence of parameter changes.

[0085] Among them, the parameter variables of the simulation model include excitation source parameters, plane wave parameters, and strand wire parameters. The plane wave parameters include elevation angle, azimuth angle, and polarization angle; the strand wire parameters include strand wire arc length, twist angle, rotation parameter, radius, length, height, load impedance, etc.

[0086] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0087] Embodiment 2

[0088] The embodiment of the present invention adopts the method described in the above embodiment to establish a coupling model and set simulation tasks in an actual electromagnetic simulation software. First, refer to Figure 4 the schematic diagram of the model of a uniform plane wave incident on a three-strand wire for parameter setting. The length of the three-strand wire is L, the height from the ground is h, and the head and tail ends of the wire are grounded through impedances Zs and ZL. E and H are the electric field component and magnetic field component of the incident electromagnetic field respectively, and k is the incident direction of the electromagnetic wave. θ p is the elevation angle of the incident wave, defined as the angle between the incident direction and the positive direction of the x-axis; φ p is the azimuth angle of the incident wave, defined as the angle between the incident direction and the y-axis in the yoz plane; θ E is the polarization angle of the incident wave, defined as the angle between the incident electric field and the incident plane in the spherical coordinate system -αθ and -αφ.

[0089] According to the above three-strand wire model, the specific modeling and simulation method steps in the electromagnetic simulation software are as follows:

[0090] Step 1: Start the general electromagnetic simulation software, select the cable type in the cable library, and construct the corresponding three-strand wire cable (corresponding to Figure 1 the three-strand wire cable library);

[0091] Step 2: Set the corresponding strand parameters according to the structural parameters and electrical parameters of the three-strand wire (corresponding to Figure 1 the three-strand wire parameters);

[0092] Step 3: Determine the shielding layer, insulating layer materials, and structure settings according to the type of the three-strand wire (corresponding to Figure 1 the three-strand wire type);

[0093] Step 4: Create the strand node coordinates (X, Y, Z) in the cable node settings, and set the endpoint coordinates of the three-strand wire according to the wire length L and the height h from the ground of the three-strand wire (corresponding to Figure 1 the three-strand wire position coordinates);

[0094] Step 5: Use MATLAB software to simulate the pulse waveform, import the drawn waveform into the excitation source library, and use it as the excitation source signal, as Figure 5 shown (corresponding to Figure 1 the electromagnetic pulse parameters);

[0095] Step 6: In the material module, set the geometric property parameters, material property parameters, and electrical characteristic parameters of the reflecting ground (corresponding to Figure 1 the floor property parameters);

[0096] Step 7: After adding the three-strand wire cable library, setting the relevant parameters of the electromagnetic environment, and the floor property parameters, complete the three-dimensional simulation model of the three-strand wire, as Figure 6 shown;

[0097] Step 8: According to the simulation solution task, set the terminal load parameters of the twisted wire and the port grounding method in the circuit schematic diagram, as Figure 7 shown (corresponding to Figure 1 the setting of the twisted wire port load and grounding method in

[0098] Step 9: In the global properties of the navigation bar, perform mesh division on the 3D model, select the mesh type and time-domain mesh settings to ensure that the calculation and solution accuracy are met (corresponding to Figure 1 the model mesh division in

[0099] Step 10: In the simulation settings module, set the background material and background spacing, and at the same time set the boundary condition type and symmetry plane (corresponding to Figure 1 the setting of background attributes and boundary conditions in

[0100] Step 11: Set the solution task for the co-simulation model. Select transient co-simulation for the circuit simulator, and set the simulation frequency range, simulation time, and excitation settings (corresponding to Figure 1 the setting of the solution task in

[0101] Step 12: After completing the above simulation operations, by changing the excitation source parameters, plane wave parameters, and twisted wire parameters, the coupled response current and voltage change results can be obtained, and the change law of the coupled response can be summarized (corresponding to Figure 1 the data post-processing and analysis in

[0102] Embodiment 3

[0103] Based on Embodiment 2 of the present invention, for the three-twisted wire model, specific parameters are set for simulation verification. Specific simulation parameter settings: The length L of the three-twisted wire cable is 100 m, the erection height h is 5 m, and the corresponding node coordinates are (-50, 0, 5) and (50, 0, 5); the conductor radius r of the cable is 1 mm, the conductor material is Al, the insulation layer thickness d is 1 mm, and the insulation layer material is PE; the incident plane wave electric field direction is (1, 0, 0), the propagation direction is (0, 0, -1), the excitation signal is a 10 / 350 us lightning electromagnetic pulse, the rise time is 10 us, the fall time is 350 us, and the corresponding pulse time-domain waveform Figure 5 ; Connect the load impedance R = 50 Ω at both ends of the twisted wire, and the simulation frequency is 0 - 1 MHz.

[0104] The simulation content includes:

[0105] (1) The influence of the terminal load of the twisted wire on the coupled response

[0106] Set variable parameters. The length of the stranded wire is 100 m, and the height from the ground is 5 m. Considering three cases of open circuit at the load end of the stranded wire, matched load, and short circuit, set the resistance at the beginning of the stranded wire to 50 Ω, and the terminal resistances to 1 Ω, 50 Ω, and 1 kΩ. Detect the coupled current and voltage results at the load port of the stranded wire.

[0107] According to Figure 8 the simulation results, it can be seen that under different terminal load conditions, the pulse response duration and pulse waveform basically remain unchanged, but the peak value of the coupled current of the three-stranded wire gradually decreases, and the peak value of the coupled voltage gradually increases, and the changing trend gradually slows down.

[0108] (2) Influence of different lightning electromagnetic pulses on the coupled response

[0109] Set variable parameters. The length of the stranded wire is 1000 m, the height from the ground is 10 m, and the loads at both ends of the stranded wire are 50 Ω. Set lightning current waveforms with 10 / 350 us, 0.25 / 100 us, and 8 / 20 us standards, and detect the coupled current and voltage results at the load port of the stranded wire.

[0110] According to Figure 9 the simulation results, it can be seen that under the excitation of different lightning electromagnetic pulses, the response time of the coupled current at the load basically remains unchanged, and the peak value of the coupled response current is most affected by the peak current of different pulses. From the comparison of different pulses, the smaller the wavefront attenuation coefficient, the larger the amplitude of the coupled response current; the larger the wave-tail attenuation coefficient, the longer the duration of the coupled response current.

[0111] In summary, a method for modeling and simulation analysis of the electromagnetic pulse coupled response of a three-stranded wire proposed by the present invention takes into account the influence of the electromagnetic pulse radiation environment and the actual three-stranded wire structure on the coupled response characteristics of the three-stranded wire in the calculation process. Through three-dimensional modeling and simulation condition setting, the present invention simulates the real environment, avoids various condition limitations such as samples, sites, and equipment, reduces the calculation time and expands the application range.

[0112] The above-described examples are only used to illustrate the implementation manner of the present invention, but should not be construed as limiting the scope of the present invention. Although the present invention has been described in detail with reference to the preferred examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A modeling and simulation analysis method for electromagnetic pulse coupling response of three-twisted wires, characterized in that: The following steps are involved: Step 1: Obtain the relevant parameters of the three-twisted cable to build a three-twisted cable model; Step 2: Determine the type and location coordinates of the three-twisted cable according to the cable usage scenario and installation conditions; Step 3: Obtain electromagnetic environment related parameters according to the external environment where the three-twisted cable is located; Step 4: Set the model floor attribute parameters according to the environmental parameters; Step 5: According to the electromagnetic pulse excitation source in the electromagnetic environment, set the excitation source parameters and the direction of the incident plane wave; Step 6: Complete the modeling operations of steps 1 to 5, obtain the three-dimensional simulation model of the three-twisted wire and complete the model mesh division; Step 7: Arrange the cable pin positions, set the terminal load and grounding method according to the three-twisted cable model schematic diagram; Step 8: Set up the joint simulation model, establish a transient simulation task and set parameters; Step 9: By changing the parameter variables in the joint simulation model, the electrical signal at the load end of the model is detected; according to the three-twisted-wire coupling simulation results, the coupling change law is obtained to analyze the influence of the parameter change.

2. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The three-twisted wire related parameters in step 1 include structural parameters, electrical parameters and application parameters. The structural parameters include conductor material and diameter, insulator material and thickness, torsion angle, and arc length; the electrical parameters include stranded wire resistance, capacitance, inductance, and impedance; and the application parameters include rated voltage, current, and frequency range. The three-twisted wire torsion angle is expressed as, Among them, s is the distance between the strands and the origin, and p is the pitch of the three strands; The arc length is expressed as, l=2πL / pα Where L is the length of the strand.

3. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The types of stranded wires described in step 2 can be divided into bare stranded wires, insulated stranded wires, and shielded stranded wires according to the insulation type; the position coordinates include the cable starting coordinates, the installation height, and the stranded wire path trajectory.

4. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The electromagnetic environment related parameters in step 3 include electromagnetic pulse parameters and space parameters; the electromagnetic pulse parameters include amplitude parameters, time parameters, spectrum parameters, energy parameters, and source parameters; the space parameters include electromagnetic wave spatial distribution, propagation direction, and electric field polarization direction.

5. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The model floor attribute parameters in step 4 include material attribute parameters, geometric attribute parameters, and electrical characteristic parameters; the material attribute parameters include electrical conductivity, relative dielectric constant, and relative magnetic permeability; the geometric attribute parameters include floor size, floor shape, and floor thickness; the electrical characteristic parameters include grounding impedance and grounding method.

6. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The excitation source parameters in step 5 include pulse waveform, pulse rise and fall time, and pulse width; the incident plane wave direction includes the incident wave propagation direction and polarization direction. The incident plane wave is expressed as, Where E is the incident electric field vector, and E0 is the magnitude of the incident electric field; The incident wave propagation direction is expressed as, Among them, e x 、e y and e z is the incident electric field vector, θ p ,φ p and θ E are the incident wave pitch angle, azimuth angle, and polarization angle; The incident wave propagation direction is expressed as, Among them, k x , k y and k Z is the wave number component.

7. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The terminal load in step 7 is composed of resistors, inductors, capacitors, nonlinear devices, etc. connected in series and parallel; the grounding methods include direct grounding, indirect grounding, and shielded grounding.

8. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: The transient simulation task in step 8 is a field-circuit joint simulation; the task parameters include simulation frequency range, simulation time and coupling port.

9. The modeling and simulation analysis method of the electromagnetic pulse coupling response of a three-twisted cable according to claim 1 is characterized in that: Step 9: The parameter variables in the simulation model include excitation source parameters, plane wave parameters and stranded wire parameters. The plane wave parameters include pitch angle, azimuth angle and polarization angle; the stranded wire parameters include stranded wire arc length, torsion angle, rotation parameters, radius, length, height, load impedance, etc.

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