Extra-high voltage line lightning resistance level evaluation method and device based on tower head gap structure

Abstract

The invention relates to an ultra-high voltage line lightning resistance level evaluation method and device based on a tower head gap structure. The method comprises the following steps: constructing a simulation model according to line structure information and electrical parameters of an extra-high voltage line and tower structure information of a power transmission tower; inputting lightning current waveform parameters and lightning channel wave impedance parameters of the extra-high voltage line into the simulation model to obtain voltage distribution information and current propagation characteristic information of the extra-high voltage line under a lightning stroke condition; flashover criterion information is determined according to the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information of the extra-high voltage line; and according to the voltage distribution information, the current propagation characteristic information and the flashover criterion information, determining a lightning resistance level evaluation result. By adopting the method, the influence of the breakdown characteristic of the tower head air gap, the complexity of the tower structure and the dynamic characteristic of lightning current propagation on the lightning resistance level evaluation can be comprehensively considered, and the accuracy of the lightning resistance level evaluation result of the extra-high voltage line is improved.

Description

Technical Field

[0001] This application relates to the technical field of lightning withstand level assessment for UHV lines, and particularly to a method, device, computer device, computer-readable storage medium, and computer program product for assessing the lightning withstand level of UHV lines based on the tower head gap structure. Background Art

[0002] UHV transmission lines are key infrastructure for realizing long-distance and large-capacity electric energy transmission in modern power systems, and their operating safety and stability are directly related to the reliability of the power grid. Since UHV lines usually operate in areas with high altitude, complex terrain, and frequent lightning activities, lightning strikes have become one of the main factors threatening their safe operation. The lightning withstand level assessment of UHV lines can quantify the line's lightning resistance ability by analyzing the electrical characteristics of the line under lightning strike conditions.

[0003] Traditional technologies mainly use simplified line models and fixed parameters for lightning withstand level assessment. However, traditional technologies do not consider the impact of the complex physical characteristics of the line on the lightning withstand level assessment, which is not conducive to improving the accuracy of the lightning withstand level assessment results for UHV lines. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a method, device, computer device, computer-readable storage medium, and computer program product for assessing the lightning withstand level of UHV lines based on the tower head gap structure, which can improve the accuracy of the lightning withstand level assessment results for UHV lines.

[0005] In a first aspect, this application provides a method for assessing the lightning withstand level of UHV lines based on the tower head gap structure, including:

[0006] Construct a simulation model according to the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission tower of the UHV line; the simulation model characterizes the electrical characteristics of the power transmission system under lightning strike conditions; the power transmission system includes the UHV line and the transmission tower;

[0007] Input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions;

[0008] Determine the flashover criterion information according to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV line;

[0009] Determine the lightning withstand level assessment result of the UHV line according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information.

[0010] In one embodiment, constructing a simulation model based on the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission towers of the UHV line includes:

[0011] According to the tower structure information of the transmission tower, determining the geometric structure size parameters of each component of the transmission tower, and generating the three-dimensional coordinate information of the transmission tower;

[0012] According to the geometric structure size parameters and the three-dimensional coordinate information, determining the wave impedance parameters of each component of the transmission tower; the wave impedance parameters of each component of the transmission tower include characteristic impedance information and propagation speed information;

[0013] Constructing the simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower.

[0014] In one embodiment, constructing the simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower includes:

[0015] Constructing an initial model according to the line structure information of the UHV line; the initial model represents the structure and layout of the UHV line;

[0016] According to the electrical parameters of the UHV line, determining the electrical characteristic information of each node in the initial model; the nodes in the initial model represent each component of the UHV line;

[0017] According to the positional relationship between each component of the UHV line and each component of the transmission tower, determining the wave impedance parameters of each node in the initial model;

[0018] According to the actual working conditions of the UHV line and the wave impedance parameters of each node in the initial model, adjusting the electrical characteristic information of each node in the initial model to obtain the simulation model.

[0019] In one embodiment, inputting the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions includes:

[0020] Through the simulation model, according to the lightning current waveform parameters and the lightning channel wave impedance parameters, determining the voltage information of each component of the UHV line, and determining the voltage distribution information according to the voltage information;

[0021] Based on the lightning current waveform parameters and the voltage information through the simulation model, determine the current waveform information and electrical characteristic parameters of each component of the UHV line, and determine the current propagation characteristic information according to the current waveform information and the electrical characteristic parameters.

[0022] In one embodiment, the determining the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information includes:

[0023] Determine the safety margin coefficient of the nodes corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information;

[0024] In the case where the safety margin coefficient is less than a preset threshold, use the node corresponding to the safety margin coefficient as a potential flashover risk point;

[0025] Determine the flashover risk function values of each component of the UHV line according to the current propagation characteristic information and the safety margin coefficients of each potential flashover risk point, and determine the flashover probability information of each component of the UHV line according to the number of potential flashover risk points and the flashover risk function values;

[0026] Perform a weighted sum on the flashover probability information according to the weights of each component of the UHV line to obtain the lightning withstand level evaluation result of the UHV line.

[0027] In one embodiment, the determining the flashover criterion information according to the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information of the UHV line includes:

[0028] Determine the critical flashover voltage information of the insulator string of the UHV line according to the insulator string discharge voltage characteristic information;

[0029] Determine the breakdown voltage information of the tower head air gap according to the tower head air gap breakdown voltage characteristic information;

[0030] Determine the flashover criterion information from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information.

[0031] In a second aspect, the present application also provides a UHV line lightning withstand level evaluation device based on the tower head gap structure, including:

[0032] A building module is used to build a simulation model according to the line structure information and electrical parameters of an UHV line, as well as the tower structure information of the transmission towers of the UHV line; the simulation model characterizes the electrical characteristics of the power transmission system under lightning strike conditions; the power transmission system includes the UHV line and the transmission towers;

[0033] An analysis module is used to input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions;

[0034] A determination module is used to determine flashover criterion information according to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV line;

[0035] An evaluation module is used to determine the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information and the flashover criterion information.

[0036] In a third aspect, the present application also provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0037] In a fourth aspect, the present application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0038] In a fifth aspect, the present application also provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0039] The above-mentioned method, device, computer equipment, computer-readable storage medium, and computer program product for evaluating the lightning withstand level of UHV transmission lines based on the tower head gap structure construct a simulation model by using the line structure information and electrical parameters of the UHV transmission line, as well as the tower structure information of the transmission towers of the UHV transmission line. The simulation model characterizes the electrical characteristics of the power transmission system under lightning strike conditions. The power transmission system includes the UHV transmission line and the transmission tower. Therefore, by combining the line structure and electrical parameters of the UHV transmission line and the tower structure of the transmission tower, a simulation model is constructed to simulate the electrical characteristics of the power transmission system composed of the UHV transmission line and the transmission tower under lightning strike conditions, so as to accurately analyze the voltage distribution and current propagation characteristics of the UHV transmission line under lightning strike conditions by using the simulation model in the follow-up. The lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV transmission line are input into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV transmission line under lightning strike conditions. Therefore, the voltage distribution and current propagation characteristics of the UHV transmission line under lightning strike conditions are accurately analyzed by using the simulation model, and the accuracy of the voltage distribution and current propagation characteristics of the UHV transmission line under lightning strike conditions is improved. According to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV transmission line, the flashover criterion information is determined. Therefore, by comprehensively considering the insulator string discharge voltage characteristic and tower head air gap breakdown voltage characteristic of the UHV transmission line, an accurate flashover criterion is determined. According to the voltage distribution information, current propagation characteristic information, and flashover criterion information, the evaluation result of the lightning withstand level of the UHV transmission line is determined. Therefore, by combining the voltage distribution and current propagation characteristics of the UHV transmission line under lightning strike conditions, the lightning withstand level of the UHV transmission line is accurately analyzed by using the flashover criterion, and an accurate evaluation result of the lightning withstand level is obtained. It can comprehensively consider the influence of the breakdown characteristics of the tower head air gap, the complexity of the tower structure, and the dynamic characteristics of lightning current propagation on the evaluation of the lightning withstand level, accurately analyze the lightning withstand level of the UHV transmission line, and thus improve the accuracy of the evaluation result of the lightning withstand level of the UHV transmission line. Brief Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 It is an application environment diagram of a method for evaluating the lightning withstand level of UHV transmission lines based on the tower head gap structure in an embodiment;

[0042] Figure 2 It is a flowchart of a method for evaluating the lightning withstand level of UHV transmission lines based on the tower head gap structure in an embodiment;

[0043] Figure 3 Schematic diagram of the process for evaluating the lightning withstand level of UHV lines based on the tower head clearance structure in an embodiment;

[0044] Figure 4 Schematic diagram of a system for evaluating the lightning withstand level of UHV lines based on the tower head clearance structure in an embodiment;

[0045] Figure 5 Block diagram of the structure of a device for evaluating the lightning withstand level of UHV lines based on the tower head clearance structure in an embodiment;

[0046] Figure 6 Internal structure diagram of a computer device in an embodiment. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] The method for evaluating the lightning withstand level of UHV lines based on the tower head clearance structure provided by the embodiments of the present application can be applied to, for example Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or can be placed on the cloud or other network servers. The terminal 102 constructs a simulation model according to the line structure information and electrical parameters of the UHV line, as well as the tower structure information of the transmission towers of the UHV line; the simulation model characterizes the electrical characteristics of the transmission system under lightning strike conditions; the transmission system includes the UHV line and the transmission tower; the terminal 102 inputs the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions; the terminal 102 determines the flashover criterion information according to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV line; the terminal 102 determines the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, current propagation characteristic information and flashover criterion information. Among them, the terminal 102 can be but is not limited to various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart vehicle-mounted devices, projection devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0049] In an exemplary embodiment, as Figure 2 shown, a method for evaluating the lightning withstand level of a UHV line based on the tower head gap structure is provided. Taking this method applied to the terminal as an example, the following steps S202 to step S208 are included. Among them:

[0050] Step S202, construct a simulation model according to the line structure information and electrical parameters of the UHV line, as well as the tower structure information of the transmission towers of the UHV line; the simulation model characterizes the electrical characteristics of the transmission system under lightning strike conditions; the transmission system includes the UHV line and the transmission tower.

[0051] Among them, the UHV line can refer to a transmission line for transmitting electric power resources of a specific voltage level.

[0052] Among them, the line structure information can refer to the information characterizing the structures such as conductors, lightning conductors, insulators, towers and fittings in the transmission line.

[0053] Among them, the electrical parameters may refer to information characterizing parameters such as the resistance, inductance, capacitance, conductance, wave impedance, and propagation constant of a transmission line.

[0054] Among them, the transmission tower may refer to a structure used to support and fix a transmission line.

[0055] Among them, the tower structure information may refer to information characterizing the structures such as the tower head, tower body, cross arm, and grounding device of a transmission tower.

[0056] Among them, the simulation model may refer to a model used to characterize the electrical characteristics of a transmission system including an UHV line and a transmission tower under lightning strike conditions.

[0057] As an example, in order to analyze the lightning withstand level of an UHV line, the terminal can first obtain the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line, and obtain the tower structure information of the transmission tower of the UHV line. Then, the terminal can analyze the electrical characteristics of a transmission system including an UHV line and a transmission tower under lightning strike conditions according to the line structure information and electrical parameters of the UHV line, as well as the tower structure information of the transmission tower of the UHV line, and construct a simulation model used to characterize the electrical characteristics of the transmission system under lightning strike conditions, so as to further analyze the lightning withstand level of the line in combination with the simulation model subsequently.

[0058] Step S204, input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions.

[0059] Among them, the lightning current waveform parameters may refer to information characterizing parameters such as the peak current and wavefront time of the lightning current.

[0060] Among them, the lightning channel wave impedance parameters may refer to information characterizing the degree of obstruction of the lightning channel to current propagation. In practical applications, the lightning channel wave impedance parameters can be regarded as a kind of wave impedance.

[0061] Among them, the voltage distribution information may refer to information characterizing the voltages of the respective components of the UHV line under lightning strike conditions.

[0062] Among them, the current propagation characteristic information may refer to information characterizing the currents in the respective components of the UHV line under lightning strike conditions. In practical applications, the current propagation characteristics may include current traveling waves, etc.

[0063] As an example, after constructing the simulation model, the terminal can determine the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line according to the lightning impulse characteristics of the UHV line, and then the terminal can input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model. The simulation model can simulate the voltage and current corresponding to each component of the UHV line under the lightning strike condition based on the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line, thereby determining the voltage distribution information and current propagation characteristic information of the UHV line under the lightning strike condition.

[0064] Step S206, determining flashover criterion information according to the discharge voltage characteristic information of the insulator string of the UHV line and the breakdown voltage characteristic information of the tower head air gap.

[0065] The insulator string discharge voltage characteristic information may refer to information on the maximum voltage that the insulator string can withstand when no electrical breakdown or flashover occurs in the insulator string under specific conditions.

[0066] The tower head air gap breakdown voltage characteristic information may refer to information characterizing the maximum voltage at which the air gap between the top of the power line tower and the ground or other conductors can maintain insulation without electrical breakdown when subjected to voltage.

[0067] The flashover criterion information may refer to information used to determine whether an insulator or an air gap will experience electrical flashover. In practical applications, the flashover criterion information may include voltage.

[0068] As an example, in order to simultaneously consider the impact of the discharge characteristics of the insulator string and the breakdown characteristics of the tower head air gap on the lightning resistance level of the line, the terminal can first obtain the discharge voltage characteristic information of the insulator string and the breakdown voltage characteristic information of the tower head air gap of the ultra-high voltage line, and then the terminal can determine the flashover criterion information from the discharge voltage characteristic information of the insulator string and the breakdown voltage characteristic information of the tower head air gap according to the relationship between the discharge voltage characteristic information of the insulator string and the breakdown voltage characteristic information of the tower head air gap of the ultra-high voltage line.

[0069] Step S208, determining the lightning resistance level assessment result of the UHV line according to the voltage distribution information, the current propagation characteristic information and the flashover criterion information.

[0070] Among them, the lightning resistance level assessment result may refer to information that characterizes whether the transmission line can withstand lightning strikes and / or whether flashover or other forms of electrical damage occur to the transmission line under lightning strike conditions. In practical applications, the lightning resistance level assessment result may include the probability of whether flashover or other forms of electrical damage occur to the transmission line under lightning strike conditions.

[0071] As an example, the terminal can analyze whether flashover occurs in each component of the UHV line based on the voltage distribution information and flashover criterion information. Then, the terminal can combine whether flashover occurs in each component of the UHV line and the current propagation characteristic information to analyze the probability of flashover or other forms of electrical damage occurring in the transmission line under lightning strike conditions, thereby determining the lightning withstand level evaluation result of the UHV line.

[0072] In the above UHV line lightning withstand level evaluation method based on the tower head gap structure, a simulation model is constructed by according to the line structure information and electrical parameters of the UHV line, as well as the tower structure information of the transmission towers of the UHV line; the simulation model characterizes the electrical characteristics of the transmission system under lightning strike conditions; the transmission system includes the UHV line and the transmission tower, so as to combine the line structure and electrical parameters of the UHV line and the tower structure of the transmission tower to construct a simulation model for simulating the electrical characteristics of the transmission system composed of the UHV line and the transmission tower under lightning strike conditions, so as to accurately analyze the voltage distribution and current propagation characteristics of the UHV line under lightning strike conditions by using the simulation model in the follow-up; input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions, so as to accurately analyze the voltage distribution and current propagation characteristics of the UHV line under lightning strike conditions by using the simulation model, and improve the accuracy of the voltage distribution and current propagation characteristics of the UHV line under lightning strike conditions; determine the flashover criterion information according to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV line, so as to comprehensively consider the insulator string discharge voltage characteristic and tower head air gap breakdown voltage characteristic of the UHV line to determine an accurate flashover criterion; determine the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, current propagation characteristic information and flashover criterion information, so as to combine the voltage distribution and current propagation characteristics of the UHV line under lightning strike conditions and use the flashover criterion to accurately analyze the lightning withstand level of the UHV line to obtain an accurate lightning withstand level evaluation result, which can comprehensively consider the influence of the breakdown characteristics of the tower head air gap, the complexity of the tower structure and the dynamic characteristics of lightning current propagation on the lightning withstand level evaluation, accurately analyze the lightning withstand level of the UHV line, and thus improve the accuracy of the UHV line lightning withstand level evaluation result.

[0073] In an exemplary embodiment, a simulation model is constructed based on the line structure information and electrical parameters of an UHV line, as well as the tower structure information of the transmission towers of the UHV line, including: determining the geometric structure dimension parameters of each component of the transmission tower according to the tower structure information of the transmission tower, and generating the three-dimensional coordinate information of the transmission tower; determining the wave impedance parameters of each component of the transmission tower according to the geometric structure dimension parameters and the three-dimensional coordinate information; the wave impedance parameters of each component of the transmission tower include characteristic impedance information and propagation speed information; constructing a simulation model according to the line structure information and electrical parameters of the UHV line, as well as the wave impedance parameters of each component of the transmission tower.

[0074] Among them, the components of the transmission tower may include the tower head, tower body, cross arm, grounding device, etc. of the transmission tower. The geometric structure dimension parameters may refer to the information characterizing the dimensions of the components of the transmission tower.

[0075] Among them, the three-dimensional coordinate information may refer to the information characterizing the coordinates of the components of the transmission tower in a preset coordinate system.

[0076] Among them, the wave impedance parameters of each component of the transmission tower may refer to the information characterizing the degree of obstruction of each component of the transmission tower to the propagation of current. In practical applications, the wave impedance parameters of each component of the transmission tower may include characteristic impedance and propagation speed.

[0077] As an example, the terminal can analyze the dimensions of the geometric structures of each component of the transmission tower according to the tower structure information of the transmission tower to obtain the geometric structure dimension parameters of each component of the transmission tower. Then, the terminal can determine the positions of each component of the transmission tower in a preset coordinate system according to the geometric structure dimension parameters. The terminal can determine the three-dimensional coordinate information of the transmission tower in the preset coordinate system according to the coordinates of the positions of each component of the transmission tower and the geometric structure dimension parameters. Then, the terminal can calculate the wave impedance parameters such as the characteristic impedance information and propagation speed information of each component of the transmission tower according to the geometric structure dimension parameters and the three-dimensional coordinate information, in combination with a preset tower wave impedance calculation expression. After that, the terminal can analyze the electrical characteristics of the UHV line and the transmission tower under lightning strike conditions according to the line structure information and electrical parameters of the UHV line, as well as the wave impedance parameters of each component of the transmission tower, and construct a simulation model.

[0078] In this embodiment, according to the pole structure information of the transmission tower, the geometric structure size parameters of each component of the transmission tower are determined, and the three-dimensional coordinate information of the transmission tower is generated; according to the geometric structure size parameters and the three-dimensional coordinate information, the wave impedance parameters of each component of the transmission tower are determined; the wave impedance parameters of each component of the transmission tower include characteristic impedance information and propagation velocity information; according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower, a simulation model is constructed, which can accurately analyze the electrical characteristics of the UHV line and the transmission tower under lightning strike conditions in combination with the complex structure of the tower, obtain an accurate simulation model, and avoid the reduction of the accuracy of the simulation model caused by equivalent the tower to a single wave impedance model, so as to accurately analyze the lightning withstand level of the UHV line in combination with the simulation model subsequently, thereby improving the accuracy of the evaluation result of the lightning withstand level of the UHV line.

[0079] In some embodiments, constructing a simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower includes: constructing an initial model according to the line structure information of the UHV line; determining the electrical characteristic information of each node in the initial model according to the electrical parameters of the UHV line; the nodes in the initial model represent each component of the UHV line; determining the wave impedance parameters of each node in the initial model according to the positional relationship between each component of the UHV line and each component of the transmission tower; adjusting the electrical characteristic information of each node in the initial model according to the actual working conditions of the UHV line and the wave impedance parameters of each node in the initial model to obtain the simulation model.

[0080] Among them, the initial model may refer to the information representing the structure and layout of the UHV line.

[0081] Among them, the nodes in the initial model may represent each component of the UHV line. The electrical characteristic information of each node in the initial model may refer to the information representing the electrical parameters of each component of the UHV line. The wave impedance parameters of each node in the initial model may refer to the information representing the wave impedance of each component of the UHV line.

[0082] Among them, the actual working conditions may refer to the information of the environmental parameters (such as meteorological conditions, power load, geographical environment, etc.) representing the actual working environment of the UHV line.

[0083] As an example, the terminal can analyze the structure and layout of the UHV line based on the line structure information of the UHV line, and construct an initial model based on the structure and layout of the UHV line. Then, the terminal can determine the electrical characteristic information of the nodes corresponding to the components of the UHV line in the initial model according to the electrical parameters of the UHV line. In practical applications, the electrical characteristic information of the nodes can include node impedance, and the calculation expression for determining the node impedance of each node in the initial model can be expressed as:

[0084] .

[0085] Among them, can refer to node impedance, can refer to the preset reference resistance value of the node, can refer to the preset reference reactance of the node, can refer to the distance from the node to the preset reference node (such as Euclidean distance), can refer to the preset geometric dimension empirical adjustment coefficient, can refer to the preset distance empirical adjustment coefficient, can refer to the imaginary unit.

[0086] After that, the terminal can analyze the component of the UHV line with the smallest spatial distance (such as Euclidean distance) from the components of the transmission tower according to the positional relationship between the components of the UHV line and the components of the transmission tower, and determine the wave impedance parameters of each node in the initial model in combination with the wave impedance parameters of the components of the transmission tower. Since the lightning withstand level of the line is also affected by the operating conditions, the terminal can adjust the electrical characteristic information of each node in the initial model according to the actual operating conditions of the UHV line and the wave impedance parameters of each node in the initial model to obtain a simulation model. In practical applications, the electrical characteristic information of the nodes can include node impedance, and the calculation expression for adjusting the node impedance of each node in the initial model can be expressed as:

[0087] ,

[0088] .

[0089] Among them, can refer to the adjusted node impedance (such as the node impedance correction value), can refer to the modulus of the node impedance, can refer to the target impedance value determined according to the wave impedance parameters and actual operating conditions of the components of the transmission tower. In practical applications, the target impedance value can be calculated by using a preset calculation expression in combination with the wave impedance parameters and actual operating conditions of the components of the transmission tower, can refer to the preset adjustment factor, It may refer to the wave impedance parameter of the main members of the transmission tower. It may refer to the wave impedance parameter of the diagonal members of the transmission tower. It may refer to the wave impedance parameter of the cross arm of the transmission tower. It may refer to the equivalent length or weight factor of the main members of the transmission tower, which is used to reflect the relative influence of the main members of the transmission tower in the overall tower structure. It may refer to the equivalent length or weight factor of the diagonal members of the transmission tower, which is used to reflect the relative influence of the diagonal members of the transmission tower in the overall tower structure. It may refer to the equivalent length or weight factor of the cross arm of the transmission tower, which is used to reflect the relative influence of the cross arm of the transmission tower in the overall tower structure. It may refer to the key parameters (such as rated load, environmental correction factor, etc.) under the current actual working conditions. It may refer to the key parameters (such as rated load, environmental correction factor, etc.) under the standard working conditions.

[0090] In this embodiment, by constructing an initial model according to the line structure information of the UHV line; determining the electrical characteristic information of each node in the initial model according to the electrical parameters of the UHV line; the nodes in the initial model represent each component of the UHV line; determining the wave impedance parameters of each node in the initial model according to the positional relationship between each component of the UHV line and each component of the transmission tower; adjusting the wave impedance parameters of each node in the initial model according to the actual working conditions of the UHV line to obtain a simulation model, it is possible to accurately analyze and adjust the electrical characteristics of the UHV line and the transmission tower under lightning strike conditions by combining the wave impedance of different structures of the tower and the actual working conditions, and obtain an accurate simulation model, so as to accurately analyze the lightning withstand level of the UHV line in combination with the simulation model subsequently, thereby improving the accuracy of the lightning withstand level assessment result of the UHV line.

[0091] In some embodiments, inputting the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions, including: determining the voltage information of each component of the UHV line through the simulation model according to the lightning current waveform parameters and the lightning channel wave impedance parameters, and determining the voltage distribution information according to the voltage information; determining the current waveform information and electrical characteristic parameters of each component of the UHV line through the simulation model according to the lightning current waveform parameters and the voltage information, and determining the current propagation characteristic information according to the current waveform information and the electrical characteristic parameters.

[0092] As an example, the terminal inputs the lightning current waveform parameters and the lightning channel wave impedance parameters into the simulation model, and then uses the simulation model to calculate the voltages of the various components of the UHV line according to the lightning current waveform parameters (such as waveform type, wavefront time, wave tail time, lightning current amplitude, etc.) and the lightning channel wave impedance parameters, obtaining the voltage information of the various components of the UHV line. Then, the terminal can determine the voltage distribution information of the UHV line under lightning strike conditions based on the voltage information. The terminal can also use the simulation model to calculate the electrical characteristic parameters of the various components of the UHV line and current waveform information such as the current amplitude according to the lightning current waveform parameters and the voltage information (or voltage distribution information), and then the terminal can determine the current propagation characteristic information of the UHV line under lightning strike conditions based on the current waveform information and the electrical characteristic parameters.

[0093] In this embodiment, according to the lightning current waveform parameters and the lightning channel wave impedance parameters through the simulation model, the voltage information of the various components of the UHV line is determined, and the voltage distribution information is determined based on the voltage information; according to the lightning current waveform parameters and the voltage information through the simulation model, the current waveform information and the electrical characteristic parameters of the various components of the UHV line are determined, and the current propagation characteristic information is determined based on the current waveform information and the electrical characteristic parameters. It is possible to accurately analyze the voltages, currents, and electrical characteristics of the various components of the UHV line by using the simulation model in combination with the lightning current waveform parameters and the lightning channel wave impedance parameters, improving the accuracy of the voltage distribution information and the current propagation characteristic information of the UHV line under lightning strike conditions, so as to subsequently evaluate the lightning withstand level of the line in combination with the voltage distribution information and the current propagation characteristic information of the UHV line under lightning strike conditions, thereby improving the accuracy of the evaluation result of the lightning withstand level of the UHV line.

[0094] In some embodiments, according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information, the evaluation result of the lightning withstand level of the UHV line is determined, including: determining the safety margin coefficient of the node corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information; in the case where the safety margin coefficient is less than the preset threshold, taking the node corresponding to the safety margin coefficient as a potential flashover risk point; determining the flashover risk function value of each component of the UHV line according to the current propagation characteristic information and the safety margin coefficient of each potential flashover risk point, and determining the flashover probability information of each component of the UHV line according to the number of potential flashover risk points and the flashover risk function value; performing a weighted sum on the flashover probability information according to the weights of the various components of the UHV line to obtain the evaluation result of the lightning withstand level of the UHV line.

[0095] Among them, the safety margin coefficient may refer to the information characterizing the safety and reliability degree of each node in the simulation model. In practical applications, the safety margin coefficient can characterize whether there is a risk of flashover at the node in the simulation model.

[0096] Among them, the flashover risk function value can refer to the information calculated based on the preset flashover risk function, using the current and safety margin coefficient corresponding to each node in the simulation model, etc.

[0097] Among them, the flashover probability information can refer to the information characterizing the flashover probability of each node in the simulation model.

[0098] As an example, the terminal can calculate the safety margin coefficient of the nodes corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information. For example, the calculation expression of the safety margin coefficient can be expressed as:

[0099] .

[0100] Among them, can refer to the safety margin coefficient of node , can refer to the flashover criterion information corresponding to node , can refer to the voltage corresponding to node , the voltage corresponding to node can be determined by the voltage distribution information, can refer to the preset adaptive smoothing coefficient.

[0101] When the safety margin coefficient is less than the preset threshold, the terminal can regard the node corresponding to the safety margin coefficient as a potential flashover risk point. To determine the lightning withstand level assessment result, the terminal can first determine the flashover risk function value of each component of the UHV line according to the current propagation characteristic information and the safety margin coefficient of each potential flashover risk point, and determine the flashover probability information of each component of the UHV line according to the number of potential flashover risk points and the flashover risk function value. For example, the calculation expression of the flashover probability information can be expressed as:

[0102] ,

[0103] .

[0104] Among them, can refer to the flashover probability information of the UHV line under lightning strike conditions, can refer to the number of potential flashover risk points, can refer to the flashover risk function value calculated from the current parameter and safety margin coefficient of node , can refer to the current parameter of node , can refer to the preset environmental randomness coupling weighting factor, It may refer to a preset reference lightning current amplitude, It may refer to a preset risk sensitivity adjustment factor, It may refer to a preset safety margin weight factor.

[0105] Then, the terminal can perform a weighted sum on the flashover probability information corresponding to each component of the UHV line according to the weights of each component of the UHV line to obtain the lightning withstand level evaluation result of the UHV line.

[0106] In this embodiment, by determining the safety margin coefficient of the node corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information; when the safety margin coefficient is less than the preset threshold, the node corresponding to the safety margin coefficient is used as a potential flashover risk point; according to the current propagation characteristic information and the safety margin coefficient of each potential flashover risk point, the flashover risk function value of each component of the UHV line is determined, and according to the number of potential flashover risk points and the flashover risk function value, the flashover probability information of each component of the UHV line is determined; by performing a weighted sum on the flashover probability information according to the weights of each component of the UHV line, the lightning withstand level evaluation result of the UHV line is obtained, which can accurately calculate the flashover probability information of each component of the UHV line by combining the difference between the voltage distribution information and the flashover criterion information, so as to obtain an accurate lightning withstand level evaluation result by using the flashover probability information and improve the accuracy of the lightning withstand level evaluation result.

[0107] In some embodiments, determining the flashover criterion information according to the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information of the UHV line includes: determining the critical flashover voltage information of the insulator string of the UHV line according to the insulator string discharge voltage characteristic information; determining the breakdown voltage information of the tower head air gap according to the tower head air gap breakdown voltage characteristic information; determining the flashover criterion information from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information.

[0108] Among them, the critical flashover voltage information may refer to the voltage (such as the critical value) applied to both ends of the insulator string when electrical breakdown (i.e., flashover) occurs on the surface of the insulator or the air gap around it under specific conditions.

[0109] Among them, the breakdown voltage information may refer to the voltage (such as the critical value) applied to the air gap when the air in the air gap between the top of the transmission line tower and the ground or other conductors loses its insulation performance and electrical breakdown occurs.

[0110] As an example, the terminal can determine the critical flashover voltage information of the insulator string of the UHV line according to the insulator string discharge voltage characteristic information, and determine the breakdown voltage information of the tower head air gap according to the tower head air gap breakdown voltage characteristic information. Then, the terminal can screen out the smaller value from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information, and use this smaller value as the flashover criterion information. For example: when the critical flashover voltage information is less than the breakdown voltage information, the critical flashover voltage information is used as the flashover criterion information; when the critical flashover voltage information is greater than the breakdown voltage information, the breakdown voltage information is used as the flashover criterion information.

[0111] In this embodiment, by determining the critical flashover voltage information of the insulator string of the UHV line according to the insulator string discharge voltage characteristic information, determining the breakdown voltage information of the tower head air gap according to the tower head air gap breakdown voltage characteristic information, and determining the flashover criterion information from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information, it is possible to accurately analyze the flashover criterion based on the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information, and obtain accurate flashover criterion information, so as to subsequently evaluate the lightning withstand level of the line in combination with the flashover criterion information.

[0112] In some embodiments, as Figure 3 shown, a schematic flow diagram for evaluating the lightning withstand level of a UHV line based on the tower head gap structure is provided. The UHV line lightning withstand level evaluation system based on the tower head gap structure can implement the evaluation of the lightning withstand level of the UHV line based on the tower head gap structure, as Figure 4As shown in the figure, a schematic diagram of a lightning withstand level evaluation system for UHV transmission lines based on the tower head clearance structure is provided. The terminal can, through the structure decomposition and wave impedance setting module, decompose the tower into main members, diagonal members, and cross arms according to the structure information of the transmission line tower, and set the wave impedance parameters of the main members, diagonal members, and cross arms respectively. Through the simulation model establishment module, according to the actual structure and electrical parameters of the transmission line, combined with the wave impedance parameters of each section of the tower, a simulation model of the UHV transmission line is established. Among them, the simulation model mainly characterizes the electrical characteristics of the UHV transmission line under lightning strike conditions, including voltage distribution, current propagation characteristics, and the dynamic response of the line. The simulation model is not limited to the distribution of electromagnetic fields, but also reflects voltage distribution and current propagation characteristics. Through the lightning current waveform and channel wave impedance calculation module, according to the lightning impulse characteristics of the UHV transmission line, the lightning current waveform and lightning current waveform parameters are set, and the lightning channel wave impedance value is determined in combination with the lightning current amplitude. Through the lightning characteristics calculation module, based on the simulation model, combined with the lightning channel wave impedance value and the lightning current waveform, the voltage distribution map and current propagation characteristics of the UHV transmission line under lightning strike conditions are calculated. Through the flashover criterion determination module, the discharge voltage characteristics of the insulator string of the UHV transmission line and the breakdown voltage characteristics of the tower head air gap are compared, and the smaller value of the two is selected as the final flashover criterion. Through the lightning withstand level evaluation module, based on the final flashover criterion, voltage distribution map, and current propagation characteristics, the lightning withstand level of the UHV transmission line is evaluated.

[0113] In practical applications, according to the structure information of the transmission line tower, the tower is decomposed into main members, diagonal members, and cross arms, and the wave impedance parameters of the main members, diagonal members, and cross arms are set respectively. Specifically, based on the CAD structure diagram of the UHV transmission line tower, the geometric structure dimension parameters of the main members, diagonal members, and cross arms of the tower are extracted, and a three-dimensional coordinate system of the tower structure is established. The extracted geometric structure dimension parameters include: the cross-sectional area and perimeter of the main member, the inclination angle and length of the diagonal member, and the cantilever length and installation height of the cross arm. The three-dimensional coordinate system takes the center of the tower foundation as the origin, and an XYZ rectangular coordinate system is established, where the Z-axis is along the vertical direction of the tower, the X-axis is along the direction of the transmission line, and the Y-axis is perpendicular to the XZ plane. According to the geometric structure dimension parameters and the three-dimensional coordinate system, the wave impedance parameters of the main members, diagonal members, and cross arms are calculated. The wave impedance parameters include characteristic impedance and propagation speed. By accurately extracting the geometric structure dimension parameters of the main members, diagonal members, and cross arms of the tower (such as the cross-sectional area and perimeter of the main member, the inclination angle and length of the diagonal member, the cantilever length and installation height of the cross arm, etc.) based on the CAD structure diagram of the UHV transmission line tower, and establishing a three-dimensional coordinate system with the center of the tower foundation as the origin, the accurate modeling of the tower structure is realized. By establishing a standardized three-dimensional coordinate system and a detailed geometric parameter extraction method, a reliable data basis is provided for the accurate calculation of wave impedance parameters, effectively improving the accuracy of tower structure decomposition and wave impedance setting.

[0114] In practical applications, according to the actual structure and electrical parameters of the transmission line, and in combination with the wave impedance parameters of each section of the tower, a simulation model of the UHV line is established, which specifically includes: extracting key geometric parameters and spatial layout information from the actual structure of the transmission line. The key geometric parameters include the cross-sectional area, length, installation angle, and relative position of each component of the tower. Based on the key geometric parameters and spatial layout information, an initial model of the UHV line is constructed; based on the electrical parameters of the transmission line, the electrical parameters include line reactance, capacitance, and base impedance information, and a fusion assignment algorithm is used to assign preliminary electrical characteristics to each node of the initial model to obtain an initial simulation model. Among them, when constructing the initial model, the key geometric parameters of each tower component (main material, diagonal member, cross arm) in the transmission line and their corresponding spatial positions have been extracted. In the initial model, the spatial position of each node (determined by its Euclidean distance D) is closely related to the position of the corresponding component in the actual structure. Therefore, the corresponding wave impedance parameters (such as the impedance of the main material, diagonal member, and cross arm calculated from the CAD structure diagram) can be assigned to the nodes that match their positions using the coordinate information of the nodes. When a node falls within or near the area of a tower component (such as the main material), the target wave impedance parameter corresponding to the node can be the wave impedance value calculated from this component; if the node is at the junction of different components, the impedance parameters of the corresponding components can be comprehensively determined to obtain the target wave impedance of the node by using weighted or interpolation methods. The wave impedance parameters of each section of the tower are matched with the corresponding nodes in the initial simulation model, and the preliminary electrical parameters are corrected according to the actual distribution of the nodes in the transmission line. For example: first calculate the actual impedance (preliminary assignment) of each node, then determine the target impedance (obtained by correcting based on the wave impedance parameters of each section and the on-site working conditions), and finally calculate the impedance correction value based on the difference between the two through a parameter optimization algorithm; the impedance and local load of each node in the initial simulation model are adjusted through a parameter optimization algorithm to obtain a simulation model.

[0115] In practical applications, according to the lightning impulse characteristics of the UHV line, the lightning current waveform and its parameters are set, and the wave impedance value of the lightning channel is determined in combination with the lightning current amplitude, which specifically includes: according to the lightning impulse characteristics of the UHV line, the standard parameters of the lightning current waveform are determined, including the waveform type, wavefront time, and wave tail time. Among them, the waveform type includes double exponential waveform, Heidler waveform, or modified Heidler waveform. According to the geographical location of the line and the intensity of lightning activity, the wavefront time and wave tail time of the lightning current waveform are determined, where the wavefront time ranges from 1 μs to 10 μs, and the wave tail time ranges from 20 μs to 200 μs; in combination with the lightning current amplitude, the wave impedance value of the lightning channel is calculated, and the wave impedance value of the lightning channel is used as an input parameter of the simulation model. In specific implementation, the calculation expression of the wave impedance value of the lightning channel can be expressed as:

[0116] 。

[0117] Among them, it may refer to the lightning channel impedance value, it may refer to the lightning current amplitude, it may refer to the peak voltage of the lightning channel, it may refer to a preset correction coefficient for the geometric characteristics of the lightning channel. By dynamically selecting an appropriate lightning current waveform type and accurately calculating the wave impedance value of the lightning channel, it is ensured that the simulation model can truly reflect the electrical characteristics under lightning strikes, improving the accuracy of calculating the voltage distribution and current propagation characteristics under lightning strike conditions and providing more reliable input parameters.

[0118] In practical applications, based on the simulation model, combined with the wave impedance value of the lightning channel and the lightning current waveform, the voltage distribution map and current propagation characteristics of the UHV line under lightning strike conditions are calculated. Specifically, it includes: based on the simulation model, the wave impedance value of the lightning channel and the lightning current waveform, numerically calculating the voltage distribution of the UHV line under lightning strike conditions to obtain the voltage values of each node of the transmission line; combining the lightning current waveform and the dynamic response of the simulation model, calculating the current propagation characteristics of the UHV line under lightning strike conditions to obtain the current waveform information of each node and the corresponding electrical characteristic parameters. For example: applying the comprehensive attenuation and coupling algorithm to calculate the voltage values of each node, where an optimized calculation method based on distance attenuation and dynamic coupling influence is used to determine the node voltage. Combining the lightning current waveform and the dynamic response of the simulation model, calculating the current propagation characteristics of the UHV line under lightning strike conditions to obtain the current waveform information of each node and the corresponding electrical characteristic parameters. Modeling the transmission delay, amplitude attenuation, and waveform distortion between each node based on the lightning current waveform parameters and the simulation model; using the time-domain transmission model and combining the feedback adjustment algorithm to calculate the current amplitude and waveform characteristics of each node to ensure that the calculated current propagation characteristics can truly reflect the dynamic response under lightning strike conditions. By numerically calculating the voltage distribution and current propagation characteristics of the UHV line under lightning strike conditions based on the simulation model, the wave impedance value of the lightning channel, and the lightning current waveform, extracting the voltage values, current waveform information, and electrical characteristic parameters of each node, and optimizing the node voltage calculation by combining the distance attenuation and dynamic coupling algorithm, while modeling and correcting the current propagation characteristics through the time-domain transmission model and the feedback adjustment algorithm; comprehensively considering the distance attenuation between nodes, the dynamic coupling effect, and the time-domain characteristics of lightning current propagation, it can truly reflect the dynamic response characteristics of the line under lightning strike conditions and improve the accuracy of calculating the voltage distribution and current propagation characteristics.

[0119] In practical applications, the discharge voltage characteristics of the insulator string and the breakdown voltage characteristics of the tower head air gap of the UHV line are compared, and the smaller value of the two is selected as the final flashover criterion, which specifically includes: according to the structural parameters and operating conditions of the UHV line, combined with the key parameters of the insulator string, including the string length, the number of petticoats, the creepage distance, and the pollution level, considering the geometric size effect of the insulator string, the polarity influence of the lightning shock wave, the correction of the relative humidity and temperature of the air, and the influence of the pollution degree on the insulation strength, calculating the discharge voltage characteristics of the insulator string and the corresponding voltage-time curve, and obtaining the critical flashover voltage value of the insulator string; based on the structural size of the tower head air gap and the atmospheric environment conditions, such as based on the gap distance, the electrode shape factor, and the spatial electric field distribution characteristics, considering information such as atmospheric pressure, air density, relative humidity, and temperature correction factors, calculating the breakdown voltage characteristics of the tower head air gap, and determining the final flashover criterion by comparing the magnitudes. By calculating the discharge voltage characteristics of the insulator string of the UHV line and the breakdown voltage characteristics of the tower head air gap, comprehensively considering the geometric size, the number of petticoats, the creepage distance, the pollution level of the insulator string, and the structural parameters and atmospheric environment conditions of the air gap, the voltage-time characteristic curve of the insulator string and the breakdown characteristic model of the air gap are established, and the final flashover criterion is determined by comparing the two; comprehensively analyzing the key parameters and environmental correction factors of the insulator string and the tower head air gap, accurately determining the critical flashover voltage of the line under lightning conditions, improving the applicability of the flashover criterion, and at the same time enhancing the adaptability of the evaluation results to the actual operating conditions.

[0120] In practical applications, based on the final flashover criterion, the voltage distribution map, and the current propagation characteristics, the lightning withstand level of the UHV line is evaluated, which specifically includes: based on the final flashover criterion and the voltage distribution map of each node, comparing the voltage value of each node with the final flashover criterion to determine the difference between the voltage of each node and the critical discharge voltage of the insulator string or the breakdown voltage of the tower head space gap; calculating the safety margin coefficient of the node based on the magnitude of the difference. When the safety margin coefficient is lower than the preset threshold, the current node is marked as a potential flashover risk point; extracting the characteristic parameters of the current waveform of each node, and combining the node flashover risk, establishing a flashover probability model of the UHV line, comprehensively quantitatively analyzing the flashover probability and lightning withstand level of the UHV line, normalizing and weighting the results output by the flashover probability model, quantitatively evaluating the lightning withstand level of the entire UHV line, and giving the corresponding judgment basis for the lightning withstand level.

[0121] In this embodiment, by decomposing the tower structure into main members, diagonal members and cross arms and setting corresponding wave impedance parameters, a simulation model is established in combination with the actual structure. The lightning current waveform is set and the wave impedance value of the lightning channel is determined. The voltage distribution and current propagation characteristics of the line under lightning strike conditions are calculated. By comparing the discharge voltage characteristics of the insulator string and the breakdown voltage characteristics of the air gap at the tower head, the final flashover criterion is determined. Considering the influence of the air gap structure at the tower head, an accurate wave impedance model for tower segments is established, and the characteristics of the insulator string and the air gap at the tower head are comprehensively analyzed, improving the accuracy of the lightning withstand level assessment of UHV lines and realizing a comprehensive assessment of the lightning withstand level of UHV lines. By extracting key geometric parameters and spatial layout information from the actual structure of the transmission line, combining with the wave impedance parameters of each tower segment, an initial model of the UHV line is constructed, and the electrical characteristics of the initial model are corrected and feedback adjusted through a parameter optimization algorithm, accurately extracting geometric parameters and optimizing the electrical characteristics of the nodes, improving the ability of the simulation model to reflect the actual operating state of the UHV line and ensuring a high consistency between the simulation model and the actual working conditions. By establishing a safety margin coefficient and a flashover probability model, comparing and analyzing the node voltage value with the final flashover criterion, and combining with the characteristic parameters of the current waveform and the coupling effect of environmental randomness, an adaptive smoothing coefficient and an environmental randomness coupling weighting factor are introduced, and the flashover probabilities of multiple key nodes are comprehensively considered, improving the accuracy of the flashover risk assessment.

[0122] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, there is no strict order limit for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0123] Based on the same inventive concept, an embodiment of the present application further provides a device for evaluating the lightning withstand level of an UHV line based on the tower head gap structure for implementing the method for evaluating the lightning withstand level of an UHV line based on the tower head gap structure described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the device for evaluating the lightning withstand level of an UHV line based on the tower head gap structure provided below can refer to the limitations on the method for evaluating the lightning withstand level of an UHV line based on the tower head gap structure in the above text, and will not be repeated here.

[0124] In an exemplary embodiment, as Figure 5 shown, a lightning withstand level evaluation device for UHV lines based on the tower head clearance structure is provided, including: a construction module 502, an analysis module 504, a determination module 506, and an evaluation module 508, where:

[0125] The construction module 502 is configured to construct a simulation model according to the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission tower of the UHV line; the simulation model characterizes the electrical characteristics of the power transmission system under lightning strike conditions; the power transmission system includes the UHV line and the transmission tower.

[0126] The analysis module 504 is configured to input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions.

[0127] The determination module 506 is configured to determine flashover criterion information according to the insulator string discharge voltage characteristic information and tower head air gap breakdown voltage characteristic information of the UHV line.

[0128] The evaluation module 508 is configured to determine the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information.

[0129] In one exemplary embodiment, the construction module 502 is further specifically configured to determine the geometric structure size parameters of each component of the transmission tower according to the tower structure information of the transmission tower, and generate three-dimensional coordinate information of the transmission tower; according to the geometric structure size parameters and the three-dimensional coordinate information, determine the wave impedance parameters of each component of the transmission tower; the wave impedance parameters of each component of the transmission tower include characteristic impedance information and propagation speed information; construct the simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower.

[0130] In one exemplary embodiment, the building block 502 is further specifically configured to construct an initial model according to the line structure information of the UHV line; the initial model represents the structure and layout of the UHV line; determine the electrical characteristic information of each node in the initial model according to the electrical parameters of the UHV line; the nodes in the initial model represent the components of the UHV line; determine the wave impedance parameters of each node in the initial model according to the positional relationship between the components of the UHV line and the components of the transmission tower; adjust the electrical characteristic information of each node in the initial model according to the actual working condition of the UHV line and the wave impedance parameters of each node in the initial model to obtain the simulation model.

[0131] In one exemplary embodiment, the analysis module 504 is further specifically configured to determine the voltage information of each component of the UHV line through the simulation model according to the lightning current waveform parameters and the lightning channel wave impedance parameters, and determine the voltage distribution information according to the voltage information; determine the current waveform information and electrical characteristic parameters of each component of the UHV line through the simulation model according to the lightning current waveform parameters and the voltage information, and determine the current propagation characteristic information according to the current waveform information and the electrical characteristic parameters.

[0132] In one exemplary embodiment, the evaluation module 508 is further specifically configured to determine the safety margin coefficient of the node corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information; in the case where the safety margin coefficient is less than a preset threshold, use the node corresponding to the safety margin coefficient as a potential flashover risk point; determine the flashover risk function value of each component of the UHV line according to the current propagation characteristic information and the safety margin coefficient of each potential flashover risk point, and determine the flashover probability information of each component of the UHV line according to the number of potential flashover risk points and the flashover risk function value; perform a weighted sum on the flashover probability information according to the weights of each component of the UHV line to obtain the lightning withstand level evaluation result of the UHV line.

[0133] In one exemplary embodiment, the determination module 506 is further specifically configured to determine the critical flashover voltage information of the insulator string of the UHV line according to the discharge voltage characteristic information of the insulator string; determine the breakdown voltage information of the tower head air gap according to the breakdown voltage characteristic information of the tower head air gap; determine the flashover criterion information from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information.

[0134] Each module in the above UHV line lightning withstand level evaluation device based on the tower head clearance structure can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0135] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as Figure 6 shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used for exchanging information between the processor and external devices. The communication interface of the computer device is used for communicating with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a UHV line lightning withstand level evaluation method based on the tower head clearance structure. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, a touchpad, or a mouse, etc.

[0136] Those skilled in the art can understand that Figure 6 the structure shown in

[0137] is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0138] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

[0139] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

[0140] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0141] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0142] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0143] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method for evaluating the lightning withstand level of UHV lines based on the tower head clearance structure, characterized in that, The method includes: Construct a simulation model according to the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission towers of the UHV line; the simulation model characterizes the electrical characteristics of the power transmission system under lightning strike conditions; the power transmission system includes the UHV line and the transmission towers; Input the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions; Determine the flashover criterion information according to the discharge voltage characteristic information of the insulator string of the UHV line and the breakdown voltage characteristic information of the tower head air gap; Determine the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information and the flashover criterion information.

2. The method according to claim 1, wherein The constructing a simulation model according to the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission towers of the UHV line includes: Determine the geometric structure dimension parameters of each component of the transmission tower according to the tower structure information of the transmission tower, and generate the three-dimensional coordinate information of the transmission tower; Determine the wave impedance parameters of each component of the transmission tower according to the geometric structure dimension parameters and the three-dimensional coordinate information; the wave impedance parameters of each component of the transmission tower include characteristic impedance information and propagation speed information; Construct the simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower.

3. The method according to claim 2, wherein The constructing the simulation model according to the line structure information and electrical parameters of the UHV line, and the wave impedance parameters of each component of the transmission tower includes: Construct an initial model according to the line structure information of the UHV line; the initial model characterizes the structure and layout of the UHV line; Determine the electrical characteristic information of each node in the initial model according to the electrical parameters of the UHV line; the nodes in the initial model characterize each component of the UHV line; Determine the wave impedance parameters of each node in the initial model according to the positional relationship between each component of the UHV line and each component of the transmission tower; Adjust the electrical characteristic information of each node in the initial model according to the actual working conditions of the UHV line and the wave impedance parameters of each node in the initial model to obtain the simulation model.

4. The method according to claim 1, characterized in that, The inputting the lightning current waveform parameters and lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and current propagation characteristic information of the UHV line under lightning strike conditions includes: Through the simulation model, determine the voltage information of each component of the UHV line according to the lightning current waveform parameters and the lightning channel wave impedance parameters, and determine the voltage distribution information according to the voltage information; Based on the lightning current waveform parameters and the voltage information through the simulation model, determine the current waveform information and electrical characteristic parameters of each component of the UHV line, and determine the current propagation characteristic information based on the current waveform information and the electrical characteristic parameters.

5. The method according to claim 4, characterized in that Determine the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information, including: Determine the safety margin coefficient of the node corresponding to each component of the UHV line according to the difference between the voltage distribution information and the flashover criterion information; In the case where the safety margin coefficient is less than the preset threshold, use the node corresponding to the safety margin coefficient as a potential flashover risk point; Determine the flashover risk function value of each component of the UHV line according to the current propagation characteristic information and the safety margin coefficient of each potential flashover risk point, and determine the flashover probability information of each component of the UHV line according to the number of potential flashover risk points and the flashover risk function value; Perform weighted summation on the flashover probability information according to the weight of each component of the UHV line to obtain the lightning withstand level evaluation result of the UHV line.

6. The method according to claim 1, wherein Determine the flashover criterion information according to the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information of the UHV line, including: Determine the critical flashover voltage information of the insulator string of the UHV line according to the insulator string discharge voltage characteristic information; Determine the breakdown voltage information of the tower head air gap according to the tower head air gap breakdown voltage characteristic information; Determine the flashover criterion information from the critical flashover voltage information and the breakdown voltage information according to the magnitude relationship between the critical flashover voltage information and the breakdown voltage information.

7. An UHV line lightning withstand level evaluation device based on the tower head clearance structure, characterized in that The device includes: A construction module for constructing a simulation model according to the line structure information and electrical parameters of the UHV line, and the tower structure information of the transmission tower of the UHV line; the simulation model represents the electrical characteristics of the power transmission system under lightning strike conditions; the power transmission system includes the UHV line and the transmission tower; An analysis module for inputting the lightning current waveform parameters and the lightning channel wave impedance parameters corresponding to the UHV line into the simulation model to obtain the voltage distribution information and the current propagation characteristic information of the UHV line under lightning strike conditions; A determination module for determining the flashover criterion information according to the insulator string discharge voltage characteristic information and the tower head air gap breakdown voltage characteristic information of the UHV line; An evaluation module for determining the lightning withstand level evaluation result of the UHV line according to the voltage distribution information, the current propagation characteristic information, and the flashover criterion information.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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