Lightning monitoring terminal layout analysis method and device for multi-branch power distribution lines

Abstract

The present invention relates to the technical field of lightning protection for power transmission and distribution lines, and discloses a method and device for analyzing the distribution of lightning monitoring terminals for multi-branch distribution lines. The present invention constructs a line lightning overvoltage simulation analysis model for a target multi-branch distribution line, constructs a lightning current source model based on the corresponding data of a lightning location system, constructs a corresponding electromagnetic transient model of induced lightning overvoltage based on the two models, and carries out electromagnetic transient simulation to analyze the characteristics and change laws of lightning current waveforms, designs a lightning monitoring terminal distribution scheme that meets the monitoring conditions based on the obtained simulation analysis results and performs simulation verification, and adjusts the distribution position and / or parameters of each lightning monitoring terminal in the scheme according to the simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements. The present invention realizes the optimized design of the lightning monitoring terminal distribution scheme applicable to multi-branch distribution lines, and lays a foundation for the accurate positioning and identification of various lightning faults in multi-branch distribution lines.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning protection for power transmission and distribution lines, and in particular to a method and device for analyzing the distribution of lightning monitoring terminals for multi-branch power distribution lines. Background Art

[0002] Relevant statistics show that the tripping of distribution lines caused by lightning strikes accounts for 60% to 80% of the total line tripping rate, among which the tripping caused by lightning induced overvoltage exceeds 80% of the total lightning tripping. Induced lightning will not cause flashover and tripping of overhead transmission lines, but it is the primary factor causing lightning tripping of distribution networks. Analyzing the induced lightning overvoltage of distribution lines and conducting research on the analysis of induced lightning faults of distribution lines will help to accurately determine the lightning fault point and lightning type of the distribution network, thereby saving a lot of manpower, material resources and time in fault location and repair, while improving the power supply reliability and safety of distribution devices.

[0003] The existing identification and location of lightning fault characteristics of distribution lines are mostly based on the two-terminal method, which applies a continuous polarized light signal to the optical fiber composite overhead ground wire of the transmission line, and uses photoelectric detection devices at both ends of the optical fiber composite overhead ground wire to detect the polarization state of the optical signal on the optical fiber composite overhead ground wire in real time. When lightning occurs, the time difference of the polarization state mutation signal obtained at both ends can be used to realize the lightning location of the transmission line. For multi-branch distribution lines, the lightning current will undergo multiple refractions and reflections when propagating on the line, and the propagation characteristics are more complex. The monitored waveforms and parameters are very different from those of transmission lines. Therefore, it is difficult to use the traditional two-terminal method to locate and identify induced lightning faults in distribution lines.

[0004] At present, there is little research on the lightning fault location and identification technology of multi-branch distribution lines. In order to realize the lightning fault location and identification of multi-branch distribution lines, it is necessary to provide a lightning monitoring terminal layout scheme suitable for multi-branch distribution lines. However, no lightning monitoring terminal layout analysis method for multi-branch distribution lines has been proposed. Summary of the invention

[0005] The present invention provides a lightning monitoring terminal layout analysis method and device for multi-branch power distribution lines, solving the technical problem of how to optimize and design a lightning monitoring terminal layout solution suitable for multi-branch power distribution lines.

[0006] A first aspect of the present invention provides a method for analyzing the placement of lightning monitoring terminals for multi-branch power distribution lines, comprising:

[0007] Acquire the topological structure and parameters of the target multi-branch distribution line, and construct a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters;

[0008] Acquire lightning monitoring data of the area where the target multi-branch distribution line is located from the lightning location system, and construct a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data;

[0009] According to the line lightning overvoltage simulation analysis model and the lightning current source model, considering the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point, a corresponding induced lightning overvoltage electromagnetic transient model is constructed;

[0010] Conduct electromagnetic transient simulation based on the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model to obtain simulation analysis results of lightning current waveform characteristics and change rules;

[0011] A lightning monitoring terminal deployment scheme that meets monitoring conditions is constructed according to the topological structure and the simulation analysis results, wherein the monitoring conditions are that each lightning monitoring terminal can monitor the lightning current waveform characteristics when induced lightning occurs at various locations of the entire target multi-branch power distribution line;

[0012] Based on the simulation analysis results, the lightning monitoring terminal deployment plan is simulated and verified, and the deployment position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal deployment plan are adjusted according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

[0013] According to an achievable manner of the first aspect of the present invention, the constructing a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters includes:

[0014] Establish a line model based on the topological structure, conductor model and line span parameters of the target multi-branch distribution line;

[0015] A single wave impedance model is used to establish the tower model;

[0016] The insulator string flashover model is established using the pilot development method;

[0017] The ground resistance model is established using the concentrated resistance model;

[0018] In combination with the line model, the pole tower model, the insulator string flashover model and the grounding resistance model, a corresponding line lightning overvoltage simulation analysis model is established.

[0019] According to an achievable method of the first aspect of the present invention, the electromagnetic transient model of the induced lightning overvoltage is constructed according to the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point, including:

[0020] Determine the critical distance for lightning current to hit the line and the critical distance for lightning to strike the ground and cause insulation flashover, and obtain the distance determination result;

[0021] According to the determined two critical distances, the target multi-branch power distribution line corresponding area is divided into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike, to obtain an area division result;

[0022] A corresponding electromagnetic transient model of induced lightning overvoltage is constructed according to the distance determination result and the area division result.

[0023] According to an achievable manner of the first aspect of the present invention, the construction of a lightning monitoring terminal deployment scheme that meets monitoring conditions according to the topological structure and the simulation analysis results includes:

[0024] Determine the effective monitoring range of the lightning monitoring terminal according to the simulation analysis results;

[0025] In combination with the topological structure and the effective monitoring range of the lightning monitoring terminal, a lightning monitoring terminal deployment plan that meets the monitoring conditions is constructed with the goal of minimizing the number of deployed lightning monitoring terminals.

[0026] A second aspect of the present invention provides a lightning monitoring terminal point analysis device for multi-branch power distribution lines, comprising:

[0027] The first model building module is used to obtain the topological structure and parameters of the target multi-branch distribution line, and build a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters;

[0028] The second model building module is used to obtain lightning monitoring data of the area where the target multi-branch power distribution line is located from the lightning location system, and to build a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data;

[0029] The third model building module is used to build a corresponding electromagnetic transient model of induced lightning overvoltage based on the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point;

[0030] A simulation analysis module, used to carry out electromagnetic transient simulation according to the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model, and obtain simulation analysis results of lightning current waveform characteristics and change rules;

[0031] A layout scheme design module is used to construct a lightning monitoring terminal layout scheme that meets the monitoring conditions according to the topological structure and the simulation analysis results. The monitoring conditions are that when induced lightning occurs at various locations of the entire target multi-branch distribution line, each lightning monitoring terminal can monitor the lightning current waveform characteristics;

[0032] The point distribution scheme verification and adjustment module is used to perform simulation verification on the lightning monitoring terminal point distribution scheme based on the simulation analysis results, and adjust the point distribution position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal point distribution scheme according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

[0033] According to an achievable manner of the second aspect of the present invention, the first model building module includes:

[0034] The first model building unit is used to build a line model according to the topological structure, conductor model and line span parameters of the target multi-branch power distribution line;

[0035] The second model building unit is used to build a tower model using a single wave impedance model;

[0036] The third model building unit is used to establish an insulator string flashover model by adopting a pilot development method;

[0037] A fourth model building unit is used to build a ground resistance model using a concentrated resistance model;

[0038] The fifth model building unit is used to establish a corresponding line lightning overvoltage simulation analysis model by combining the line model, the tower model, the insulator string flashover model, and the grounding resistance model.

[0039] According to an achievable manner of the second aspect of the present invention, the third model building module includes:

[0040] A first determination unit is used to determine a critical distance for a lightning current to hit a line and a critical distance for a lightning current to strike the ground and cause insulation flashover, and obtain a distance determination result;

[0041] The second determining unit is used to divide the target multi-branch power distribution line corresponding area into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike according to the determined two critical distances, and obtain an area division result;

[0042] The sixth model building unit is used to build a corresponding electromagnetic transient model of induced lightning overvoltage according to the distance determination result and the area division result.

[0043] According to an achievable manner of the second aspect of the present invention, the point layout design module includes:

[0044] A third determining unit, configured to determine an effective monitoring range of a lightning monitoring terminal according to the simulation analysis result;

[0045] The point layout design unit is used to combine the topology structure and the effective monitoring range of the lightning monitoring terminal, with the purpose of minimizing the number of lightning monitoring terminals to build a lightning monitoring terminal point layout plan that meets the monitoring conditions.

[0046] A third aspect of the present invention provides a lightning monitoring terminal point analysis device for multi-branch power distribution lines, comprising:

[0047] A memory for storing instructions; wherein the instructions are used to implement the lightning monitoring terminal layout analysis method for multi-branch power distribution lines as described in any of the above implementation methods;

[0048] A processor is used to execute instructions in the memory.

[0049] A fourth aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the lightning monitoring terminal layout analysis method for multi-branch power distribution lines as described in any of the above achievable methods.

[0050] It can be seen from the above technical solutions that the present invention has the following advantages:

[0051] The present invention constructs a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters of the target multi-branch power distribution line, constructs a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data corresponding to the lightning positioning system, constructs a corresponding electromagnetic transient model of induced lightning overvoltage based on the two models, and carries out electromagnetic transient simulation to obtain simulation analysis results of lightning current waveform characteristics and change laws, and constructs a lightning monitoring terminal deployment plan based on the simulation analysis results. The plan can ensure that each lightning monitoring terminal can monitor the lightning current waveform characteristics when induced lightning occurs at various locations of the entire line. Finally, the plan is simulated and verified, and the deployment position and / or parameters of each lightning monitoring terminal in the plan are adjusted according to the simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements; the present invention realizes the optimization of the lightning monitoring terminal deployment plan applicable to multi-branch power distribution lines. The design finally obtained the lightning monitoring terminal layout scheme can meet the lightning monitoring needs of multi-branch power distribution lines. The lightning monitoring terminal layout scheme obtained based on the method and system analysis of the present invention is used to analyze the lightning current waveform characteristics and change rules, which is conducive to realizing the accurate judgment of the lightning fault point and lightning strike type of the multi-branch power distribution network, thereby saving a lot of manpower, material resources and time in fault location and repair, and improving the power supply reliability and safety of the distribution system. The research results can provide support for the subsequent construction of lightning parameter distributed monitoring terminals and distributed monitoring systems on multi-branch 10kV distribution lines, and lay the foundation for the accurate positioning and identification of various lightning faults on multi-branch power distribution lines. On the whole, it is conducive to quickly identifying the fault location, realizing efficient maintenance and power restoration, improving the digital level of lightning fault positioning in the distribution network, and promoting the intelligent and transparent development of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 A flowchart of a method for analyzing the placement of lightning monitoring terminals for multi-branch distribution lines provided by an optional embodiment of the present invention;

[0054] Figure 2 A schematic diagram of dividing a target multi-branch power distribution line corresponding area into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike, provided in an optional embodiment of the present invention;

[0055] Figure 3A structural connection block diagram of a lightning monitoring terminal point distribution analysis system for multi-branch power distribution lines provided in an optional embodiment of the present invention.

[0056] Reference numerals:

[0057] 1-First model construction module; 2-Second model construction module; 3-Third model construction module; 4-Simulation analysis module; 5-Point layout design module; 6-Point layout verification and adjustment module. DETAILED DESCRIPTION

[0058] The embodiments of the present invention provide a lightning monitoring terminal layout analysis method and device for multi-branch power distribution lines, which are used to solve the technical problem of how to optimize the design of a lightning monitoring terminal layout solution suitable for multi-branch power distribution lines.

[0059] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] The invention provides a lightning monitoring terminal point distribution analysis method for multi-branch power distribution lines.

[0061] See also Figure 1 , Figure 1 A flow chart of a method for analyzing the placement of lightning monitoring terminals for multi-branch power distribution lines provided by an embodiment of the present invention is shown.

[0062] An embodiment of the present invention provides a method for analyzing the placement of lightning monitoring terminals for multi-branch power distribution lines, comprising:

[0063] Step S1, obtaining the topological structure and parameters of the target multi-branch distribution line, and constructing a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters.

[0064] In one achievable manner, the constructing a corresponding line lightning overvoltage simulation analysis model according to the topology structure and parameters includes:

[0065] Establish a line model based on the topological structure, conductor model and line span parameters of the target multi-branch distribution line;

[0066] A single wave impedance model is used to establish the tower model;

[0067] The insulator string flashover model is established using the pilot development method;

[0068] The ground resistance model is established using the concentrated resistance model;

[0069] In combination with the line model, the pole tower model, the insulator string flashover model and the grounding resistance model, a corresponding line lightning overvoltage simulation analysis model is established.

[0070] In this embodiment, the flashover criterion adopts the leader development model. The leader development method regards the flashover process of the insulator string as the breakdown process of a long gap equal to the length of the insulator.

[0071] As a specific implementation method, when the leader development method is used to establish the insulator string flashover model, the leader development speed can be calculated according to the following formula:

[0072]

[0073] Where, v(t) is the leader development speed at time t, in m / μs, u(t) is the voltage across the insulator string at time t, in kV, g is the leader development length, in m, l is the insulator string length, in m, and E0 is the critical breakdown strength, in kV / m;

[0074] In the simulation program, the lightning current waveform is applied to both sides of the insulator, and the leader development speed in a certain period of time is as follows:

[0075]

[0076] Where, v(t0+Δt) is the leader development speed at t0+Δt, in m / μs; u(t0+Δt) is the voltage across the insulator string at t0+Δt, in kV; d g is the insulator string length, is the leader development speed at time t0, and k is the leader development coefficient.

[0077] Step S2, obtaining lightning monitoring data of the area where the target multi-branch power distribution line is located from the lightning location system, and constructing a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data.

[0078] Specifically, based on the data of the lightning location system, the lightning parameter characteristics of the target multi-branch power distribution line within a certain distance range in recent years can be refined and analyzed to establish a lightning current source model. The lightning parameter characteristics include polarity, amplitude and multiple return ground lightning parameters. The distance range and time range of the extracted data can be determined according to actual needs. For example, the lightning parameter characteristics of the target multi-branch power distribution line within 1 km in the past 10 years can be refined and analyzed to establish a lightning current source model.

[0079] When establishing a lightning current source model, the following formula for the lightning induced overvoltage of a conductor without a lightning arrester can be used:

[0080]

[0081] Where U g is the induced lightning overvoltage value, in kV; h d is the height of the conductor from the ground, in meters; D is the distance between the lightning strike point and the conductor, in meters; I is the lightning current amplitude, in kA; K is the coefficient.

[0082] Step S3, based on the line lightning overvoltage simulation analysis model and the lightning current source model, considering the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point, a corresponding induced lightning overvoltage electromagnetic transient model is constructed.

[0083] In an achievable manner, the electromagnetic transient model of the induced lightning overvoltage is constructed according to the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point, including:

[0084] Determine the critical distance for lightning current to hit the line and the critical distance for lightning to strike the ground and cause insulation flashover, and obtain the distance determination result;

[0085] According to the determined two critical distances, the target multi-branch power distribution line corresponding area is divided into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike, to obtain an area division result;

[0086] A corresponding electromagnetic transient model of induced lightning overvoltage is constructed according to the distance determination result and the area division result.

[0087] When establishing the electromagnetic transient model of induced lightning overvoltage, it is necessary to correctly distinguish the critical distance between the lightning strike line area and the lightning strike to the ground causing insulation flashover.

[0088] Among them, according to the formula recommended by the national standard, the expression of the critical distance S of lightning striking the earth corresponding to a certain tower height and lightning current amplitude can be derived as follows:

[0089]

[0090] Where I is the lightning current amplitude, h is the average height of the conductor to the ground, r g The distance that lightning strikes the earth.

[0091] Among them, for the area where lightning directly strikes the line, lightning striking this area may cause lightning conductor flashover or lightning tower flashover of the line insulator; for the area where insulator flashover occurs after lightning strikes, lightning striking the ground in this area will cause insulator flashover; for the area where insulator does not flashover after lightning strikes, lightning striking the ground in this area will not cause insulator flashover.

[0092] Figure 2 The schematic diagram of dividing the target multi-branch power distribution line corresponding area into the lightning direct line area, the insulator flashover area after lightning strike and the insulator non-flashover area after lightning strike provided by the embodiment of the present invention is shown. Figure 2 The area division logic shown is used to divide the target multi-branch distribution lines into corresponding areas. Figure 2 In the figure, A is the area where lightning directly strikes the line, B is the area where the insulator flashes after lightning strikes, and C is the area where the insulator does not flash after lightning strikes. c S is the lightning strike distance to the line, min，i is the lightning strike line distance. Lightning will strike the line if the distance is less than this. For the lightning current striking the conductor, the line flashover rate can be calculated based on the lightning current amplitude probability distribution function and the line lightning withstand level obtained by simulation calculation; S max，i It is the critical distance for lightning flashover to the earth. If the distance is greater than this, the line will not flashover.

[0093] Step S4, performing electromagnetic transient simulation according to the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model, and obtaining simulation analysis results of lightning current waveform characteristics and change rules.

[0094] When conducting electromagnetic transient simulation, fault characteristics are extracted by distributed point monitoring. Specifically, the target multi-branch distribution network line can be divided into monitoring intervals, and monitoring points can be arranged in each monitoring interval to statistically analyze the three-phase lightning current waveform characteristics formed by the induced lightning overvoltage on the distribution line, as well as the wave head peak attenuation rate and wave head change law in each monitoring interval.

[0095] Step S5, constructing a lightning monitoring terminal deployment plan that meets monitoring conditions based on the topological structure and the simulation analysis results, wherein the monitoring conditions are that each lightning monitoring terminal can monitor the lightning current waveform characteristics when induced lightning occurs at any point in the entire target multi-branch distribution line.

[0096] In one achievable manner, the constructing a lightning monitoring terminal deployment plan that meets monitoring conditions according to the topological structure and the simulation analysis results includes:

[0097] Determine the effective monitoring range of the lightning monitoring terminal according to the simulation analysis results;

[0098] In combination with the topological structure and the effective monitoring range of the lightning monitoring terminal, a lightning monitoring terminal deployment plan that meets the monitoring conditions is constructed with the goal of minimizing the number of deployed lightning monitoring terminals.

[0099] When determining the effective monitoring range of a lightning monitoring terminal, since each monitoring terminal has limited monitoring capability for the current wave head, the effective monitoring range of each monitoring point can be inferred based on the law of the wave head peak attenuation rate.

[0100] For example, if the current wave head peak is lower than 40A, it cannot be detected by the monitoring terminal. According to the law of wave head peak attenuation rate, the distance between the lightning strike point and the monitoring point can be inferred, and the wave head peak transmitted to the monitoring point will be attenuated to below 40A, so as to determine the effective monitoring range of each monitoring point.

[0101] With the goal of minimizing the number of lightning monitoring terminals, a lightning monitoring terminal deployment plan that meets the monitoring conditions is constructed, which can ensure that the entire line can be monitored with the smallest possible number of monitoring terminals, thereby maximizing the technical and economic benefits.

[0102] Step S6, based on the simulation analysis results, the lightning monitoring terminal deployment plan is simulated and verified, and the deployment position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal deployment plan are adjusted according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

[0103] Specifically, the simulation analysis is performed under the designed lightning monitoring terminal layout scheme, when each point of the multi-branch distribution line is subjected to induced lightning with different lightning current amplitudes, the change and distribution of lightning current at the monitoring point are obtained, and the corresponding analysis results are obtained. The analysis results include the amplitude, wavefront time, bandwidth, wavefront arrival time and waveform data of the line current wave head after the lightning strike. According to the analysis results, the amplitude range that can be monitored by the lightning monitoring terminal can be known, thereby providing a reference for the subsequent layout location and / or parameter adjustment of the lightning monitoring terminal.

[0104] For the constructed lightning monitoring terminal deployment plan, the number of lightning monitoring terminals will generally be reduced compared to step S4, especially for the lightning monitoring terminal deployment plan constructed with the purpose of minimizing the number of deployed lightning monitoring terminals. In contrast, the features monitored by each monitoring point may not be obvious, and it is necessary to compare the analysis results obtained in step S6 with the simulation analysis results of step S4 to observe whether the waveform characteristics and parameter change rules are consistent with the simulation analysis results of step S4, so as to obtain the simulation verification results.

[0105] When the simulation verification result indicates that the analysis result obtained in step S6 is inconsistent with the simulation analysis result in step S4, it is necessary to adjust the location and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal deployment plan. The parameters may be clock synchronization, sampling rate, amplitude, etc.

[0106] The preset minimum monitoring requirement can be set according to actual conditions. For example, the preset minimum monitoring requirement is that the lightning monitoring terminal can monitor the entire variation range of the three-phase current wave of the line.

[0107] The present invention also provides a lightning monitoring terminal point distribution analysis system for multi-branch power distribution lines.

[0108] See also Figure 3 , Figure 3 The structure connection block diagram of a lightning monitoring terminal point distribution analysis system for multi-branch power distribution lines provided by an embodiment of the present invention is shown.

[0109] An embodiment of the present invention provides a lightning monitoring terminal point analysis system for multi-branch power distribution lines, comprising:

[0110] The first model building module 1 is used to obtain the topological structure and parameters of the target multi-branch distribution line, and build a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters;

[0111] The second model building module 2 is used to obtain lightning monitoring data of the area where the target multi-branch power distribution line is located from the lightning location system, and to build a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data;

[0112] The third model building module 3 is used to build a corresponding electromagnetic transient model of induced lightning overvoltage based on the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point;

[0113] The simulation analysis module 4 is used to carry out electromagnetic transient simulation according to the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model, and obtain simulation analysis results of lightning current waveform characteristics and change rules;

[0114] A layout scheme design module 5 is used to construct a lightning monitoring terminal layout scheme that meets the monitoring conditions according to the topological structure and the simulation analysis results. The monitoring conditions are that each lightning monitoring terminal can monitor the lightning current waveform characteristics when induced lightning occurs at all locations of the entire target multi-branch power distribution line;

[0115] The deployment plan verification and adjustment module 6 is used to perform simulation verification on the lightning monitoring terminal deployment plan based on the simulation analysis results, and adjust the deployment position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal deployment plan according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

[0116] In one achievable manner, the first model building module 1 includes:

[0117] The first model building unit is used to build a line model according to the topological structure, conductor model and line span parameters of the target multi-branch power distribution line;

[0118] The second model building unit is used to build a tower model using a single wave impedance model;

[0119] The third model building unit is used to establish an insulator string flashover model by adopting a pilot development method;

[0120] A fourth model building unit is used to build a ground resistance model using a concentrated resistance model;

[0121] The fifth model building unit is used to establish a corresponding line lightning overvoltage simulation analysis model by combining the line model, the tower model, the insulator string flashover model, and the grounding resistance model.

[0122] In one achievable manner, the third model building module 3 includes:

[0123] A first determination unit is used to determine a critical distance for a lightning current to hit a line and a critical distance for a lightning current to strike the ground and cause insulation flashover, and obtain a distance determination result;

[0124] The second determining unit is used to divide the target multi-branch power distribution line corresponding area into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike according to the determined two critical distances, and obtain an area division result;

[0125] The sixth model building unit is used to build a corresponding electromagnetic transient model of induced lightning overvoltage according to the distance determination result and the area division result.

[0126] In one achievable manner, the site layout design module 5 includes:

[0127] A third determining unit, configured to determine an effective monitoring range of a lightning monitoring terminal according to the simulation analysis result;

[0128] The point layout design unit is used to combine the topology structure and the effective monitoring range of the lightning monitoring terminal, with the purpose of minimizing the number of lightning monitoring terminals to build a lightning monitoring terminal point layout plan that meets the monitoring conditions.

[0129] The present invention also provides a lightning monitoring terminal point analysis device for multi-branch power distribution lines, comprising:

[0130] A memory for storing instructions; wherein the instructions are used to implement the lightning monitoring terminal layout analysis method for multi-branch power distribution lines as described in any one of the above embodiments;

[0131] A processor is used to execute instructions in the memory.

[0132] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for analyzing the layout of lightning monitoring terminals for multi-branch power distribution lines as described in any one of the above embodiments is implemented.

[0133] The above-mentioned embodiment of the present invention realizes the optimized design of the lightning monitoring terminal layout scheme suitable for multi-branch power distribution lines. The final lightning monitoring terminal layout scheme can meet the lightning monitoring needs of multi-branch power distribution lines. The lightning monitoring terminal layout scheme obtained based on the method and system analysis of the present invention is used to analyze the lightning current waveform characteristics and change rules, which is conducive to the accurate judgment of the lightning fault point and lightning type of the multi-branch power distribution network, thereby saving a lot of manpower, material resources and time in fault location and repair, and improving the power supply reliability and safety of the distribution system. The research results can provide support for the subsequent construction of lightning parameter distributed monitoring terminals and distributed monitoring systems on multi-branch 10kV distribution lines, and lay the foundation for the accurate positioning and identification of various lightning faults in multi-branch power distribution lines. It is generally conducive to quickly identifying the fault location, realizing efficient maintenance and power restoration, improving the digital level of lightning fault positioning in the distribution network, and promoting the intelligent and transparent development of the power grid.

[0134] Technical personnel in the relevant field can clearly understand that, for the convenience and conciseness of description, the specific working processes of the devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments, and the specific beneficial effects of the devices and modules described above can refer to the corresponding beneficial effects in the aforementioned method embodiments, which will not be repeated here.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0136] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0137] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0138] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0139] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightning monitoring terminal layout analysis method for multi-branch power distribution lines, characterized in that: include: Acquire the topological structure and parameters of the target multi-branch distribution line, and construct a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters; Acquire lightning monitoring data of the area where the target multi-branch distribution line is located from the lightning location system, and construct a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data; According to the line lightning overvoltage simulation analysis model and the lightning current source model, considering the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point, a corresponding induced lightning overvoltage electromagnetic transient model is constructed; Conduct electromagnetic transient simulation based on the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model to obtain simulation analysis results of lightning current waveform characteristics and change rules; A lightning monitoring terminal deployment scheme that meets monitoring conditions is constructed according to the topological structure and the simulation analysis results, wherein each lightning monitoring terminal can monitor the lightning current waveform characteristics when induced lightning occurs at various locations of the entire target multi-branch power distribution line; Based on the simulation analysis results, the lightning monitoring terminal deployment plan is simulated and verified, and the deployment position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal deployment plan are adjusted according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

2. The lightning monitoring terminal layout analysis method for multi-branch power distribution lines according to claim 1 is characterized in that: The constructing of a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters includes: Establish a line model based on the topological structure, conductor model and line span parameters of the target multi-branch distribution line; A single wave impedance model is used to establish the tower model; The insulator string flashover model is established using the pilot development method; The ground resistance model is established using the concentrated resistance model; In combination with the line model, the pole tower model, the insulator string flashover model and the grounding resistance model, a corresponding line lightning overvoltage simulation analysis model is established.

3. The lightning monitoring terminal layout analysis method for multi-branch power distribution lines according to claim 1 is characterized in that: The method of constructing a corresponding electromagnetic transient model of induced lightning overvoltage based on the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of changes in the induced lightning overvoltage applied to the target multi-branch wiring line with the lightning current amplitude and the distance from the lightning strike point, includes: Determine the critical distance for lightning current to hit the line and the critical distance for lightning to strike the ground and cause insulation flashover, and obtain the distance determination result; According to the determined two critical distances, the target multi-branch power distribution line corresponding area is divided into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike, to obtain an area division result; A corresponding electromagnetic transient model of induced lightning overvoltage is constructed according to the distance determination result and the area division result.

4. The lightning monitoring terminal layout analysis method for multi-branch power distribution lines according to claim 1 is characterized in that: The constructing of a lightning monitoring terminal deployment scheme that meets monitoring conditions according to the topological structure and the simulation analysis results includes: Determine the effective monitoring range of the lightning monitoring terminal according to the simulation analysis results; In combination with the topological structure and the effective monitoring range of the lightning monitoring terminal, a lightning monitoring terminal deployment plan that meets the monitoring conditions is constructed with the goal of minimizing the number of deployed lightning monitoring terminals.

5. A lightning monitoring terminal layout analysis device for multi-branch power distribution lines, characterized in that: include: The first model building module is used to obtain the topological structure and parameters of the target multi-branch distribution line, and build a corresponding line lightning overvoltage simulation analysis model according to the topological structure and parameters; The second model building module is used to obtain lightning monitoring data of the area where the target multi-branch power distribution line is located from the lightning location system, and to build a lightning current source model considering the probability distribution of lightning current amplitude according to the lightning monitoring data; The third model building module is used to build a corresponding electromagnetic transient model of induced lightning overvoltage based on the line lightning overvoltage simulation analysis model and the lightning current source model, taking into account the law of the induced lightning overvoltage applied to the target multi-branch wiring line changing with the lightning current amplitude and the distance from the lightning strike point; A simulation analysis module, used to carry out electromagnetic transient simulation according to the line lightning overvoltage simulation analysis model and the induced lightning overvoltage electromagnetic transient model, and obtain simulation analysis results of lightning current waveform characteristics and change rules; A layout scheme design module is used to construct a lightning monitoring terminal layout scheme that meets the monitoring conditions according to the topological structure and the simulation analysis results. The monitoring conditions are that when induced lightning occurs at various locations of the entire target multi-branch distribution line, each lightning monitoring terminal can monitor the lightning current waveform characteristics; The point distribution scheme verification and adjustment module is used to perform simulation verification on the lightning monitoring terminal point distribution scheme based on the simulation analysis results, and adjust the point distribution position and / or parameters of each lightning monitoring terminal in the lightning monitoring terminal point distribution scheme according to the obtained simulation verification results, so that each lightning monitoring terminal can meet the preset minimum monitoring requirements.

6. The lightning monitoring terminal layout analysis device for multi-branch power distribution lines according to claim 5, characterized in that: The first model building module includes: The first model building unit is used to build a line model according to the topological structure, conductor model and line span parameters of the target multi-branch power distribution line; The second model building unit is used to build a tower model using a single wave impedance model; The third model building unit is used to establish an insulator string flashover model by adopting a pilot development method; A fourth model building unit is used to build a ground resistance model using a concentrated resistance model; The fifth model building unit is used to establish a corresponding line lightning overvoltage simulation analysis model by combining the line model, the tower model, the insulator string flashover model, and the grounding resistance model.

7. The lightning monitoring terminal layout analysis device for multi-branch power distribution lines according to claim 5, characterized in that: The third model building module includes: A first determination unit is used to determine a critical distance for a lightning current to hit a line and a critical distance for a lightning current to strike the ground and cause insulation flashover, and obtain a distance determination result; The second determining unit is used to divide the target multi-branch power distribution line corresponding area into a lightning-directed line area, an insulator flashover area after lightning strike, and an insulator non-flashover area after lightning strike according to the determined two critical distances, and obtain an area division result; The sixth model building unit is used to build a corresponding electromagnetic transient model of induced lightning overvoltage according to the distance determination result and the area division result.

8. The lightning monitoring terminal layout analysis device for multi-branch power distribution lines according to claim 5, characterized in that: The point layout design module includes: A third determining unit, configured to determine an effective monitoring range of a lightning monitoring terminal according to the simulation analysis result; The point layout design unit is used to combine the topology structure and the effective monitoring range of the lightning monitoring terminal, with the purpose of minimizing the number of lightning monitoring terminals to build a lightning monitoring terminal point layout plan that meets the monitoring conditions.

9. A lightning monitoring terminal layout analysis device for multi-branch power distribution lines, characterized in that: include: A memory for storing instructions; wherein the instructions are used to implement the lightning monitoring terminal layout analysis method for multi-branch power distribution lines according to any one of claims 1 to 4; A processor is used to execute instructions in the memory.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for analyzing the placement of lightning monitoring terminals for multi-branch power distribution lines according to any one of claims 1 to 4 is implemented.

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