A transmission tower line simulation method, device, equipment and storage medium

Abstract

The present invention discloses a transmission tower line simulation method, apparatus, device, and storage medium. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for a first subsystem consisting of a lightning channel, a tower, and overhead line segments directly connected to the tower. A one-dimensional time-domain finite difference method is used to establish a multi-conductor transmission line model for a second subsystem consisting of overhead line segments not directly connected to the tower. Interface node analysis equations are established between the first and second subsystems to jointly solve for the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire. This method addresses the technical problems of large errors in tower surge assessments caused by traditional transmission tower models that fail to consider the mutual coupling between the lightning channel, tower, and transmission line, and inaccurate analysis of lightning surge impacts caused by the TEM-based MTL model's inability to accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during lightning strikes.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission lines, and in particular to a power transmission tower line simulation method, device, equipment and storage medium. Background Art

[0002] Direct lightning strikes on high-voltage transmission lines are one of the most serious threats to power systems. With the continuous expansion of transmission line networks, system outages caused by lightning have increased significantly, with lightning-related tripping accounting for nearly 30% of the total tripping rate in areas with severe thunderstorms. It is important to note that the tower's surge response is a primary factor in assessing backflashover. Proper assessment of lightning surges is essential for insulation coordination and risk management in power systems.

[0003] Lightning surges can be assessed experimentally on full-scale or small-scale towers. However, for efficient lightning hazard assessment, numerical calculations are often preferred in practical applications. Traditionally, circuit-based tower models have been used for analysis. Using these models, such as the multi-layer impedance tower model, the insulator voltages on the tower are easily calculated. Circuit-based models can be smoothly integrated into commercial software such as EMTP and PSCAD. However, this circuit-based approach cannot fully describe the surge propagation behavior on the tower. Importantly, the mutual coupling between the tower, lightning channel, and transmission line is not considered. Since the spatiotemporal distribution characteristics of lightning currents are important factors in determining the tower surge response, ignoring mutual coupling can lead to significant errors in tower surge assessments.

[0004] The Multiple Transmission Line (MTL) model is often used to analyze lightning surges on transmission line towers. This model specifically focuses on the electromagnetic response of transmission lines and their associated structures to lightning strikes. It is well known that when a tower is struck by lightning, the resulting electromagnetic field initially diffuses spherically along the tower. This diffusion is highly peculiar because it does not occur entirely in the transverse electromagnetic mode (TEM), which is the underlying assumption of MTL models. This means that traditional TEM-based MTL models may not accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during a lightning strike. In practical applications, this limitation can lead to inaccurate analysis of lightning surge effects. In particular, when high-voltage transmission line towers are struck by direct lightning, the propagation characteristics of the electromagnetic waves can differ significantly from those predicted by traditional MTL models.

[0005] Therefore, how to solve the problem of large errors in evaluating tower surges caused by the existing transmission tower model not considering the mutual coupling between the lightning channel, tower and transmission line, and the problem of inaccurate analysis of the impact of lightning surges caused by the limitation of the TEM-based MTL model that cannot accurately capture the actual propagation behavior of electromagnetic waves on the transmission line tower during lightning strikes, are technical problems that urgently need to be solved by technical personnel in this field. Summary of the Invention

[0006] The present invention provides a transmission tower line simulation method, apparatus, device and storage medium for resolving the technical problems that conventional transmission tower models fail to consider the mutual coupling between lightning channels, towers and transmission lines, resulting in large errors in tower surge assessments; and that TEM-based MTL models are unable to accurately capture the actual propagation behavior of electromagnetic waves on transmission line towers during lightning strikes, leading to inaccurate analysis of lightning surge impacts.

[0007] In view of this, a first aspect of the present invention provides a transmission tower line simulation method, comprising:

[0008] The high-voltage overhead transmission line system with a grounding wire is divided into a first subsystem and a second subsystem. The first subsystem includes the lightning channel formed in the air by the charge accumulated during the lightning leader process, the tower, and the overhead line segment directly connected to the tower. The second subsystem includes the overhead line segment not directly connected to the tower.

[0009] A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for the first subsystem, and a one-dimensional finite difference time-domain method is used to establish a multi-conductor transmission line model for the second subsystem;

[0010] Establishing interface node analysis equations between the first subsystem and the second subsystem;

[0011] The partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations are combined to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire.

[0012] Optionally, the partial element equivalent circuit model is:

[0013]

[0014] in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node.

[0015] Optionally, the multi-conductor transmission line model is:

[0016]

[0017] in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line.

[0018] Optionally, the interface node analysis equation is:

[0019]

[0020] in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

[0021] Optionally, a partial element equivalent circuit model, a multi-conductor transmission line model, and an interface node analysis equation are combined to solve the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire, including:

[0022] The backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire by combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equations.

[0023] A second aspect of the present invention provides a transmission tower line simulation device, comprising:

[0024] a system division module, configured to divide a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem, wherein the first subsystem includes a lightning channel formed in the air by charges accumulated during a lightning leader process, a tower, and an overhead line segment directly connected to the tower, and the second subsystem includes overhead line segments not directly connected to the tower;

[0025] A modeling module, configured to establish a partial element equivalent circuit model for the first subsystem using a partial element equivalent circuit method, and to establish a multi-conductor transmission line model for the second subsystem using a one-dimensional finite difference time domain method;

[0026] An interface node model building module, used for building interface node analysis equations for the first subsystem and the second subsystem;

[0027] The solution module is used to combine the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire.

[0028] Optionally, the partial element equivalent circuit model is:

[0029]

[0030] in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node;

[0031] The multi-conductor transmission line model is:

[0032]

[0033] in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line;

[0034] The interface node analysis equation is:

[0035]

[0036] in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

[0037] Optionally, the solution module is specifically used to:

[0038] The backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire by combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equations.

[0039] A third aspect of the present invention provides a transmission tower line simulation device, the device comprising a processor and a memory:

[0040] The memory is used to store program code and transmit the program code to the processor;

[0041] The processor is configured to execute the transmission tower line simulation method according to any one of the first aspects according to the instructions in the program code.

[0042] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the transmission tower line simulation method described in any one of the first aspects.

[0043] From the above technical solutions, it can be seen that the transmission tower line simulation method provided by the present invention has the following advantages:

[0044] The transmission tower line simulation method provided by the present invention divides a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem. The first subsystem includes a lightning channel formed in the air by the charge accumulated during the lightning leader process, a tower, and an overhead line segment directly connected to the tower. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for the first subsystem, fully considering the mutual coupling between the lightning channel, the tower, and the transmission line. For the second subsystem composed of overhead line segments not directly connected to the tower, a one-dimensional time-domain finite difference method is used to establish a multi-conductor transmission line model. At the same time, interface node analysis equations are established between the first and second subsystems. By combining the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations, the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire are solved. This overcomes the limitation of the TEM-based MTL model, which cannot accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during lightning strikes. It also solves the technical problems of large errors in tower surge assessment caused by the traditional transmission tower model's failure to consider the mutual coupling between lightning channels, towers and transmission lines, as well as inaccurate analysis of the impact of lightning surges caused by the limitation of the TEM-based MTL model. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A schematic diagram of a flow chart of a transmission tower line simulation method provided in an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of a model of a high-voltage overhead transmission line system with a grounding wire provided in an embodiment of the present invention;

[0048] Figure 3 A schematic structural diagram of a transmission tower line simulation device provided in an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of a transmission tower line simulation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] For easier understanding, see Figure 1 The present invention provides an embodiment of a transmission tower line simulation method, comprising:

[0052] Step 101: Divide a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem, wherein the first subsystem includes a lightning channel formed in the air by the charge accumulated during the lightning leader process, a tower, and an overhead line segment directly connected to the tower; and the second subsystem includes an overhead line segment not directly connected to the tower.

[0053] It should be noted that the system cabinet used in the transmission tower line simulation method provided in this invention is a high-voltage overhead transmission line system with a grounding wire. In a high-voltage overhead transmission line system with a grounding wire, if lightning directly strikes one of the towers, the charge accumulated during the lightning leader process will form a lightning channel in the air, and part of the lightning current will go up along the lightning channel into the cloud layer, while the other part will go along the transmission tower into the grounding grid. In order to evaluate the lightning surge of the high-voltage overhead transmission line system, the high-voltage overhead transmission line system is divided into a first subsystem and a second subsystem. The first subsystem includes the lightning channel formed in the air by the charge accumulated during the lightning leader process, the tower, and the overhead line segment directly connected to the tower. The second subsystem includes the overhead line segment not directly connected to the tower.

[0054] Step 102: A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for the first subsystem, and a one-dimensional finite difference time-domain method is used to establish a multi-conductor transmission line model for the second subsystem.

[0055] It should be noted that if Figure 2 As shown in the figure, for the first subsystem, the partial element equivalent circuit (PEEC) method is used to establish a partial element equivalent circuit model. In this model, the mutual coupling between the lightning channel, the tower and the overhead line segment directly connected to the tower is fully considered. Specifically, the tower can be regarded as a set of interconnected conductors. The tower is affected by the lightning return stroke, which is simulated as a voltage source connected to the upward conductor representing the lightning channel. The tower is connected to the part of the tower top on the ground. The tower and the lightning channel are represented by a conductor structure. The conductors in the structure and part of the overhead line are divided into multiple segments for PEEC modeling. The partial element equivalent circuit model is:

[0056]

[0057] in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node.

[0058] For the second subsystem, a multiple transmission line (MTL) model was established using the one-dimensional finite-difference-time-domain (FDTD) method for simulation. The lightning voltage and current on the transmission line were numerically calculated using the MTL model in the time domain. The MTL model is:

[0059]

[0060] in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line. For shorter lines, these parameters can be calculated using an ideal earth, and the line losses can be ignored.

[0061] Step 103: Establish an interface node analysis equation between the first subsystem and the second subsystem.

[0062] It should be noted that in the time domain analysis, the simulation results of each time step of the first subsystem and the second subsystem are exchanged at the interface node. The interface node analysis equation of the first subsystem and the second subsystem established in the present invention is:

[0063]

[0064] in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

[0065] The equivalent circuits of other electronic equipment in the high-voltage overhead transmission line system can also be added to the interface node analysis equations.

[0066] Step 104: Combine the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equation to solve the node voltage and branch current of each branch of the high-voltage overhead transmission line system with a grounding wire.

[0067] It should be noted that by combining the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations, the backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire, which greatly improves the functionality of simulating complex line systems.

[0068] The transmission tower line simulation method provided by the present invention divides a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem. The first subsystem includes a lightning channel formed in the air by the charge accumulated during the lightning leader process, a tower, and an overhead line segment directly connected to the tower. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for the first subsystem, fully considering the mutual coupling between the lightning channel, the tower, and the transmission line. For the second subsystem composed of overhead line segments not directly connected to the tower, a one-dimensional time-domain finite difference method is used to establish a multi-conductor transmission line model. At the same time, interface node analysis equations are established between the first and second subsystems. By combining the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations, the node voltages and branch currents of a high-voltage overhead transmission line system with a grounding wire are solved. This overcomes the limitation of the TEM-based MTL model, which cannot accurately capture the true propagation behavior of electromagnetic waves on transmission line towers during lightning strikes. It also solves the technical problems of large errors in tower surge assessment caused by the traditional transmission tower model's failure to consider the mutual coupling between lightning channels, towers and transmission lines, as well as inaccurate analysis of the impact of lightning surges caused by the limitation of the TEM-based MTL model.

[0069] At the same time, the transmission tower line simulation method provided in the present invention combines the advantages of PEEC and FDTD, and has good calculation efficiency and accuracy.

[0070] For easier understanding, see Figure 3 The present invention provides an embodiment of a transmission tower line simulation device, comprising:

[0071] a system division module, configured to divide a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem, wherein the first subsystem includes a lightning channel formed in the air by charges accumulated during a lightning leader process, a tower, and an overhead line segment directly connected to the tower, and the second subsystem includes overhead line segments not directly connected to the tower;

[0072] A modeling module, configured to establish a partial element equivalent circuit model for the first subsystem using a partial element equivalent circuit method, and to establish a multi-conductor transmission line model for the second subsystem using a one-dimensional finite difference time domain method;

[0073] An interface node model building module, used for building interface node analysis equations for the first subsystem and the second subsystem;

[0074] The solution module is used to combine the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire.

[0075] The equivalent circuit model of some elements is:

[0076]

[0077] in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node;

[0078] The multi-conductor transmission line model is:

[0079]

[0080] in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line;

[0081] The interface node analysis equation is:

[0082]

[0083] in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

[0084] The solver module is specifically used for:

[0085] The backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire by combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equations.

[0086] The transmission tower line simulation device provided in the present invention is used to execute the transmission tower line simulation method provided in the present invention. Its principles and technical effects are the same as those of the transmission tower line simulation method provided in the present invention, and will not be repeated here.

[0087] For easier understanding, see Figure 4 The present invention provides an embodiment of a transmission tower line simulation device, the device including a processor and a memory:

[0088] The memory is used to store program code and transmit the program code to the processor;

[0089] The processor is used to execute the transmission tower line simulation method provided in the present invention according to the instructions in the program code.

[0090] The present invention also provides an embodiment of a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the transmission tower line simulation method provided in the present invention.

[0091] The transmission tower line simulation device and computer-readable storage medium provided in the present invention are used to execute the transmission tower line simulation method provided in the present invention. The principles and technical effects achieved are the same as those of the transmission tower line simulation method provided in the present invention, and will not be repeated here.

[0092] The terms "first," "second," "third," "fourth," and so forth (if any) in the present description and drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can, for example, be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0093] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transmission tower line simulation method, characterized in that: include: The high-voltage overhead transmission line system with a grounding wire is divided into a first subsystem and a second subsystem. The first subsystem includes the lightning channel formed in the air by the charge accumulated during the lightning leader process, the tower, and the overhead line segment directly connected to the tower. The second subsystem includes the overhead line segment not directly connected to the tower. A partial element equivalent circuit method is used to establish a partial element equivalent circuit model for the first subsystem, and a one-dimensional finite difference time-domain method is used to establish a multi-conductor transmission line model for the second subsystem; Establishing interface node analysis equations between the first subsystem and the second subsystem; Combine the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire; The equivalent circuit model of some elements is: ； in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node; The interface node analysis equation is: ； in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

2. The transmission tower line simulation method according to claim 1, characterized in that: The multi-conductor transmission line model is: ； in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line.

3. The transmission tower line simulation method according to claim 2, characterized in that: Combine the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equations to solve the node voltage and branch current of the high-voltage overhead transmission line system with ground wire, including: The backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire by combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equations.

4. A transmission tower line simulation device, characterized in that: include: a system division module, configured to divide a high-voltage overhead transmission line system with a grounding wire into a first subsystem and a second subsystem, wherein the first subsystem includes a lightning channel formed in the air by charges accumulated during a lightning leader process, a tower, and an overhead line segment directly connected to the tower, and the second subsystem includes overhead line segments not directly connected to the tower; A modeling module, configured to establish a partial element equivalent circuit model for the first subsystem using a partial element equivalent circuit method, and to establish a multi-conductor transmission line model for the second subsystem using a one-dimensional finite difference time domain method; An interface node model building module, used for building interface node analysis equations for the first subsystem and the second subsystem; A solution module is used to combine the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equation to solve the node voltage and branch current of the high-voltage overhead transmission line system with a ground wire; The equivalent circuit model of some elements is: ； in, is the resistance of the i-th branch, is the inductance between branch i and branch j, is the mutual potential coefficient between node k and node m, is the self-potential coefficient of node k, is an external voltage source, is an external current source, is the capacitive current vector of the j-th branch, is the node voltage of the kth node, is the node voltage of the k+1th node; The interface node analysis equation is: ； in, is the node-branch connection relationship matrix between the partial element equivalent circuit and the multi-conductor transmission line circuit, is the node-branch connection relationship matrix of the partial element equivalent circuit, is the node-branch connection relationship matrix of the multi-conductor transmission line circuit, is the resistance coefficient matrix of the multi-conductor transmission line circuit, d / dt is the derivative of the variable with respect to time t, is the resistance coefficient matrix of the equivalent circuit of some elements, is the inductance matrix of the equivalent circuit of some elements, is the inverse of the potential coefficient matrix of the partial element equivalent circuit, is the voltage of the multi-conductor transmission line circuit, is the inductance of the multi-conductor transmission line circuit, is the capacitance of the multi-conductor transmission line circuit, is the coupling potential coefficient matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the coupling inductance matrix between the partial element equivalent circuit model and the multi-conductor transmission line model, for The transpose of is the current of the equivalent circuit of some elements, is the external voltage source matrix, is the external current source matrix.

5. The transmission tower line simulation device according to claim 4, characterized in that: The multi-conductor transmission line model is: ； in, is the current generated by lightning at horizontal position x, is the voltage generated by lightning at the horizontal position x, is the inductance per unit length of the line, is the capacitance per unit length of the line.

6. The transmission tower line simulation device according to claim 5, characterized in that: The solver module is specifically used for: The backward Euler method is used to solve the node voltages and branch currents of the high-voltage overhead transmission line system with a grounding wire by combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equations.

7. A transmission tower line simulation device, characterized in that: The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the transmission tower line simulation method according to any one of claims 1-3 according to the instructions in the program code.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store program code, and the program code is used to execute the transmission tower line simulation method according to any one of claims 1 to 3.

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