Transmission tower line simulation method, device and equipment and storage medium

Abstract

The invention discloses a power transmission tower line simulation method, device and equipment and a storage medium, and the method comprises the steps: building a partial element equivalent circuit model for a first subsystem composed of a lightning channel, a tower and an overhead line segment directly connected with the tower through employing a partial element equivalent circuit method; establishing a multi-conductor power transmission line model for a second subsystem formed by overhead line segments which are not directly connected with the tower by adopting a one-dimensional time domain finite difference method, and establishing an interface node analysis equation of the first subsystem and the second subsystem; and jointly solving the voltage of each node and the branch current of each branch of the high-voltage overhead transmission line system with the grounding wire. The method solves the problems that a traditional transmission tower model does not consider mutual coupling among a lightning channel, a tower and a transmission line, so that the error of tower surge evaluation is large; and the technical problem that the analysis on the lightning surge influence is inaccurate due to the limitation that the MTL model based on the TEM cannot accurately capture the real propagation behavior of the electromagnetic waves on the power transmission line tower during lightning stroke is solved.

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. As the transmission line network continues to expand year by year, system blackouts caused by lightning strikes have increased significantly, and lightning-related tripping accounts for almost 30% of the total tripping rate in severe thunderstorm areas. It is important to note that the surge response of the tower is the main factor in evaluating back flashover. Correct evaluation of lightning surges is necessary for insulation coordination and risk management of power systems.

[0003] Lightning surges can be evaluated by conducting experiments on full-scale or small-scale towers. However, in order to efficiently evaluate lightning hazards, numerical calculations are always preferred in practical situations. 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 propagation behavior of surges 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 current are important factors in determining the tower surge response, ignoring the mutual coupling may lead to significant errors in evaluating tower surges.

[0004] The Multiple Transmission Line (MTL) model is often used when analyzing lightning surges on towers. This model specifically focuses on the electromagnetic response of the transmission line and its attached structures when struck by lightning. It is well known that when a tower is struck by lightning, the resulting electromagnetic field initially spreads in a spherical manner on the tower. This spreading is very special because it does not proceed entirely in the transverse electromagnetic mode (TEM), which is usually the basis for the assumptions of the MTL model. This means that the conventional TEM-based MTL model may not accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when struck by lightning. In practical applications, this limitation may lead to an inaccurate analysis of the effects of lightning surges. In particular, in the case of direct lightning strikes on high-voltage transmission line towers, the propagation characteristics of the electromagnetic waves may differ significantly from those predicted by the conventional MTL model.

[0005] Therefore, how to solve the problem that the existing transmission tower model does not take into account the mutual coupling between the lightning channel, tower and transmission line, resulting in large errors in evaluating tower surges, and the problem of inaccurate analysis of the impact of lightning surges due to the limitation of the TEM-based MTL model that cannot accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when lightning strikes, are technical problems that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The present invention provides a transmission tower line simulation method, device, equipment and storage medium, which are used to solve the technical problems that the traditional transmission tower model does not consider the mutual coupling between the lightning channel, the tower and the transmission line, resulting in large errors in evaluating the tower surge, and the MTL model based on TEM cannot accurately capture the actual propagation behavior of electromagnetic waves on the transmission line tower when lightning strikes, resulting in inaccurate analysis of the impact of lightning surge.

[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, wherein the first subsystem includes a lightning channel formed in the air by the accumulated charges 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;

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

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

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

[0024] A system division module, used for dividing 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 in a 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;

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

[0026] An interface node model building module, used to build an interface node analysis equation between the first subsystem and the second subsystem;

[0027] The 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 each branch 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 ith 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 partial element equivalent circuit, 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 for:

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

[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 used to execute the transmission tower line simulation method described in 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] It can be seen from the above technical solutions 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 charges accumulated in a 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, and the mutual coupling between the lightning channel, the tower, and the transmission line is fully considered. 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, an interface node analysis equation between the first subsystem and the second subsystem is established. 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 the high-voltage overhead transmission line system with a grounding wire are solved, which avoids the limitation of the TEM-based MTL model that cannot accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when struck by lightning. It also solves the technical problems that the traditional transmission tower model does not consider the mutual coupling between the lightning channel, tower and transmission line, resulting in large errors in evaluating tower surges, and the inaccurate analysis of the impact of lightning surges caused by the limitation of the TEM-based MTL model that cannot accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when struck by lightning. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 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 It is a structural schematic diagram of a transmission tower line simulation device provided in an embodiment of the present invention;

[0049] Figure 4 It 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 scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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 creative work are 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 the present 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, lightning directly hits one of the towers, and the charge accumulated in 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, and 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 in the lightning leader process, the tower and the overhead line segment directly connected to the tower, and 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 time-domain finite difference 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, for the first subsystem, the Partial Element Equivalent Circuit (PEEC) method is used to establish a partial element equivalent circuit model, in which 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, and 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 ith 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, the one-dimensional finite-difference-time-domain (FDTD) method is used to establish a multiple transmission line (MTL) model for simulation. The lightning voltage and current on the transmission line are 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 between 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 partial element equivalent circuit, 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, combining the partial element equivalent circuit model, the multi-conductor transmission line model and the interface node analysis equation to solve the node voltages and branch currents 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, the multi-conductor transmission line model and the interface node analysis equation, the backward Euler method is used to solve the node voltage and branch current 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 charges accumulated in a 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, and the mutual coupling between the lightning channel, the tower, and the transmission line is fully considered. 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, an interface node analysis equation between the first subsystem and the second subsystem is established. 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 the high-voltage overhead transmission line system with a grounding wire are solved, which avoids the limitation of the TEM-based MTL model that cannot accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when struck by lightning. It also solves the technical problems that the traditional transmission tower model does not consider the mutual coupling between the lightning channel, tower and transmission line, resulting in large errors in evaluating tower surges, and the inaccurate analysis of the impact of lightning surges caused by the limitation of the TEM-based MTL model that cannot accurately capture the true propagation behavior of electromagnetic waves on the transmission line tower when struck by lightning.

[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, used for dividing 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 in a 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;

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

[0073] An interface node model building module, used to build an interface node analysis equation between the first subsystem and the second subsystem;

[0074] The 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 each branch 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 ith 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 partial element equivalent circuit, 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 solution module is specifically used for:

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

[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 principle 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 comprising 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 codes, and the program codes are 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 principle 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", etc. (if any) in the specification and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein, for example. 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 device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[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 aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may 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, wherein the first subsystem includes a lightning channel formed in the air by the accumulated charges 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; 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; 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 each branch of the high-voltage overhead transmission line system with grounding wire.

2. The transmission tower line simulation method according to claim 1, characterized in that: The equivalent circuit model of some elements is: in, is the resistance of the ith 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.

3. The transmission tower line simulation method according to claim 2, 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.

4. The transmission tower line simulation method according to claim 3, characterized in that: 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 partial element equivalent circuit, 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 method according to claim 4, characterized in that: Combined with the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equation, the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire are solved, including: The backward Euler method is used to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire by combining the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equation.

6. A transmission tower line simulation device, characterized in that: include: A system division module, used for dividing 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 in a 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; A modeling module, used for establishing a partial element equivalent circuit model for the first subsystem by using a partial element equivalent circuit method, and establishing a multi-conductor transmission line model for the second subsystem by using a one-dimensional finite difference time domain method; An interface node model building module, used to build an interface node analysis equation between the first subsystem and the second subsystem; The 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 each branch of the high-voltage overhead transmission line system with grounding wire.

7. The transmission tower line simulation device according to claim 6, characterized in that: The equivalent circuit model of some elements is: in, is the resistance of the ith 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 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; 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 partial element equivalent circuit, 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.

8. The transmission tower line simulation device according to claim 7, characterized in that: The solution module is specifically used for: The backward Euler method is used to solve the node voltage and branch current of the high-voltage overhead transmission line system with grounding wire by combining the partial element equivalent circuit model, multi-conductor transmission line model and interface node analysis equation.

9. A transmission tower line simulation device, characterized in that: The device comprises 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 1-5 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the transmission tower line simulation method according to any one of claims 1-5.

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