A transmission line lightning strike simulation analysis method and system

Abstract

The present invention discloses a transmission line lightning strike simulation analysis method and system, which relates to the field of transmission line technology, including obtaining transmission line information, collecting lightning information in the transmission line area, obtaining a regional lightning data set, and performing lightning strike simulation on the transmission line according to regional environmental information and simulated lightning data, and obtaining lightning strike simulation data. The present invention divides the regional lightning data set by lightning attribute feature quantity, realizes the analysis of lightning data, ensures the accuracy and stability of lightning data, improves the accuracy of subsequent lightning simulation, further adjusts the lightning current model by lightning data correction term and lightning current peak correction coefficient, reduces simulation error, accurately evaluates the impact of lightning strike on transmission line by transmission line lightning strike risk index, improves the safety, stability and reliability of power system, and reduces failures and losses caused by lightning strike.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission lines, and in particular to a method and system for simulating and analyzing lightning strikes on power transmission lines. Background Art

[0002] Transmission lines are an important part of the power system, and they are responsible for the transportation and distribution of electric power. Their safe and stable operation has always been the focus of attention of power grid companies. Since transmission lines cover a large area and are more susceptible to environmental influences, if they are damaged by lightning accidents, it will cause the stagnation of power transmission and affect the safe and stable operation of the power grid. There are two main types of lightning accidents on transmission lines, namely, direct lightning strikes on transmission lines and induced lightning strikes on transmission lines.

[0003] At present, there are still problems in lightning simulation for transmission lines, such as the inability to analyze lightning data according to the regional environment of the transmission lines, the inability to select appropriate lightning data for lightning simulation based on historical lightning data, the inability to accurately analyze lightning simulation results, and the inability to accurately evaluate the impact of different lightning strikes on transmission lines. Summary of the invention

[0004] In order to solve the above technical problems, a method and system for simulating and analyzing lightning strikes on transmission lines are provided. The technical solution solves the problems raised in the above background technology that the lightning data cannot be analyzed according to the regional environment of the transmission line, the appropriate lightning data cannot be selected for lightning simulation based on historical lightning data, the lightning simulation results cannot be accurately analyzed, and the impact of different lightning strikes on the transmission line cannot be accurately evaluated.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A transmission line lightning strike simulation analysis method, comprising:

[0007] Acquire transmission line information, wherein the transmission line information includes transmission line parameter information and transmission line area information;

[0008] Collecting lightning information in the transmission line area to obtain a regional lightning data set, wherein the regional lightning data set includes several groups of regional historical lightning data;

[0009] Obtain lightning current model based on regional lightning dataset;

[0010] Based on the lightning current model, obtaining simulated lightning data, wherein the simulated lightning data represents lightning current data that changes with time;

[0011] Acquire regional environmental information according to the transmission line regional information, wherein the regional environmental information includes regional terrain information and regional soil characteristic information;

[0012] Performing lightning strike simulation on the transmission line according to the regional environmental information and the simulated lightning data to obtain lightning strike simulation data, wherein the lightning strike simulation data includes direct lightning strike simulation data and induced electricity simulation data;

[0013] Based on lightning strike simulation data, the transmission line is evaluated to obtain the transmission line lightning strike risk index;

[0014] According to the transmission line lightning risk index, it is determined whether the transmission line needs to be adjusted. If not, the lightning simulation data is recorded. If so, the transmission line is adjusted according to the lightning simulation data.

[0015] Preferably, obtaining a lightning current model according to a regional lightning data set specifically includes:

[0016] According to the transmission line information, the transmission line parameters are analyzed to obtain the maximum current information of the transmission line;

[0017] According to the regional lightning data set, the lightning current waveform information, lightning current peak information and duration information corresponding to each set of regional historical lightning data are obtained;

[0018] Based on the maximum current of the transmission line, the duration is further divided to obtain the lightning current rise time and lightning current decay time;

[0019] Based on the ratio of the lightning current peak value and the lightning current rise time, the lightning current change rate is obtained;

[0020] The product of the lightning current peak value and the lightning current change rate is used as the lightning attribute characteristic quantity;

[0021] Based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning dataset, a box plot of lightning attribute characteristic quantity is obtained;

[0022] Based on the box plot analysis requirements, obtain the box plot outlier limit information, wherein the box plot outlier limit includes the box plot outlier lower limit and the box plot outlier upper limit;

[0023] According to the outlier boundary information of the box plot, the regional lightning dataset is divided to obtain the classification information of the regional lightning dataset;

[0024] The regional lightning data set classification includes a first historical lightning data set, a second historical lightning data set and a third historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​lower than the lower limit of the box plot outlier is classified into the first historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​higher than the upper limit of the box plot outlier is classified into the third historical lightning data set;

[0025] The lightning current model is obtained based on the classification information of the regional lightning dataset.

[0026] Preferably, further dividing the duration to obtain the lightning current rise time and the lightning current decay time specifically includes:

[0027] Obtain duration information based on regional lightning datasets;

[0028] The time required for the current waveform to rise from the initial value of the lightning current to the peak value of the lightning current is taken as the rise time;

[0029] Based on the lightning current peak information and the maximum current information of the transmission line, the lightning current characteristic value and the transmission line current calibration value are obtained;

[0030] If the lightning current characteristic value is greater than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the transmission line current calibration value is taken as the decay time;

[0031] If the lightning current characteristic value is less than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the lightning current characteristic value is taken as the decay time.

[0032] Preferably, obtaining the lightning current model according to the classification information of the regional lightning data set specifically includes:

[0033] According to the classification information of the regional lightning dataset, a first historical lightning dataset, a second historical lightning dataset and a third historical lightning dataset are obtained;

[0034] The historical lightning data of the area with the largest lightning current peak value in the first historical lightning data set is used as the lightning data of the first data set for calibration;

[0035] Calibrate lightning data according to the first historical lightning data set and the first data set to obtain lightning data correction items;

[0036] The average value of the lightning current peak value in the second historical lightning data set is used as the standard lightning current peak value;

[0037] Based on the standard lightning current peak, an initial lightning current model is constructed;

[0038] According to the second historical lightning data set, the initial lightning current model is adjusted to obtain a basic lightning current model;

[0039] Obtaining the average value of the lightning current rise time and the average value of the lightning current decay time in the second historical lightning data set, and using them as the third data set to calibrate the lightning current rise time and the lightning current decay time;

[0040] The third historical lightning data set is screened based on the lightning current rise time and lightning current decay time calibrated by the third data set;

[0041] Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained;

[0042] A lightning current model is obtained according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient.

[0043] Preferably, the step of obtaining the lightning current model according to the lightning data correction term, the basic lightning current model and the lightning current peak correction coefficient specifically includes:

[0044] According to the first historical lightning data set, obtaining the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set;

[0045] Aligning the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set with the peak moment of lightning current of the calibrated lightning data of the first data set;

[0046] Calibrate the lightning data according to the first data set, and obtain duration information in the calibrated lightning data of the first data set;

[0047] Calibrate the duration information in the lightning data and the first historical lightning data set according to the first data set to obtain a lightning data correction item;

[0048] Based on the calibrated lightning current rise time and lightning current decay time of the third data set, the lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set is obtained:

[0049]

[0050] In the formula, represents the lightning duration difference coefficient of the j-th group of regional historical lightning data in the third historical lightning data set, is the lightning current rise time of the jth group of regional historical lightning data in the third historical lightning data set, Calibrate the lightning current rise time for the third data set, is the lightning current decay time of the jth group of regional historical lightning data in the third historical lightning data set, calibrating a lightning current decay time for a third data set;

[0051] According to the lightning duration difference coefficient, determine whether the historical lightning data of the group of regions is available;

[0052] Among them, if , then remove the historical lightning data of this group of regions. , then the historical lightning data of this group of regions are available;

[0053] Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained;

[0054] Obtaining a lightning current model according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient;

[0055] The lightning data correction items are specifically:

[0056]

[0057] In the formula, is the lightning data correction item, is the first historical lightning data set for each i-th group of regional historical lightning data The lightning current value at the moment, The first dataset is used to calibrate the lightning data. The lightning current value at the time, d is the total duration of the lightning data calibrated by the first data set, and n is the total number of historical lightning data sets in the region in the first historical lightning data set;

[0058] The lightning current peak correction coefficient is specifically:

[0059]

[0060] Where k is the lightning current peak correction factor, is the lightning current peak influence coefficient of the jth group of regional historical lightning data in the third historical lightning data set after screening, is the peak value of lightning current of the jth group of regional historical lightning data in the third historical lightning data set after screening, is the standard lightning current peak value, where ,but ,like ,but , m is the total number of regional historical lightning data sets of the third historical lightning data set after screening;

[0061] The lightning current model is specifically:

[0062]

[0063] In the formula, is the lightning current at time t, and Lightning current model attenuation parameter, t is the time variable.

[0064] Preferably, judging whether the transmission line needs to be adjusted according to the transmission line lightning risk index specifically includes:

[0065] According to the lightning strike simulation data, direct lightning strike simulation data and induced electricity simulation data are obtained;

[0066] According to the direct lightning strike simulation data, the lightning strike transient overvoltage data of the transmission line is obtained;

[0067] Based on the lightning transient overvoltage data of transmission lines, obtain the direct lightning risk index;

[0068] Obtain the lightning overvoltage data of the transmission line based on the induced electricity simulation data;

[0069] Obtain the induced electricity risk index based on the lightning overvoltage data of the transmission line;

[0070] Acquiring regional lightning strike frequency information, wherein the regional lightning strike frequency information includes regional direct lightning strike frequency information and regional total lightning strike frequency information;

[0071] The ratio of the regional direct lightning strike frequency to the regional total lightning strike frequency is used as the risk coefficient of the direct lightning strike risk index;

[0072] According to the regional environmental information and based on expert evaluation, a direct lightning strike influence coefficient is obtained, wherein the direct lightning strike influence coefficient indicates the degree of influence of the regional environment on the probability of direct lightning strikes on the transmission line;

[0073] Based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning impact coefficient, the transmission line lightning risk index is obtained;

[0074] Based on the lightning safety requirements of the transmission line, the threshold of the lightning risk index of the transmission line is obtained;

[0075] According to the transmission line lightning risk index and the transmission line lightning risk index threshold, it is judged whether the transmission line needs to be adjusted. If the transmission line lightning risk index is lower than the transmission line lightning risk index threshold, the lightning strike simulation data is recorded. If the transmission line lightning risk index is higher than the transmission line lightning risk index threshold, the transmission line is adjusted according to the lightning strike simulation data.

[0076] Wherein, the transmission line lightning risk index is:

[0077]

[0078] In the formula, is the transmission line lightning risk index, is the direct lightning strike frequency in the area, f is the total lightning strike frequency in the area, is the direct lightning impact coefficient, is the maximum operating voltage of the transmission line, is the standard lightning current peak value, is the inductance per unit length of the transmission line, C is the capacitance per unit length of the transmission line, is the vacuum permeability, and , is the distance between the lightning strike point and the transmission line, and r is the height between the transmission line and the ground.

[0079] Furthermore, a transmission line lightning strike simulation analysis system is proposed, which is used to implement the above analysis method, including:

[0080] A main control module, the main control module is used to determine whether the group of regional historical lightning data is available according to the lightning duration difference coefficient, determine whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold, further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain the lightning attribute characteristic quantity box plot based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data;

[0081] An information acquisition module, the information acquisition module is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, acquire a regional lightning data set, acquire regional environmental information, including regional terrain information and regional soil property information, based on the transmission line area information, perform lightning strike simulation on the transmission line based on the regional environmental information and simulated lightning data, acquire lightning strike simulation data, and transmit the lightning strike simulation data to the evaluation module;

[0082] An evaluation module, wherein the evaluation module is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the calibrated lightning current rise time and lightning current decay time of the third data set, obtain a direct lightning risk index based on the lightning transient overvoltage data of the transmission line, obtain an induced electricity risk index based on the lightning overvoltage data of the transmission line, and obtain a transmission line lightning risk index based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning influence coefficient;

[0083] A display module interacts with the main control module and is used to display the lightning current model, lightning strike simulation data and the transmission line lightning strike risk index.

[0084] Optionally, the main control module specifically includes:

[0085] A control unit, wherein the control unit is used to further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain a box plot of the lightning attribute characteristic quantity based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data;

[0086] An information receiving unit, which interacts with the information acquisition module and the evaluation module to receive data and transmit it to the judgment unit;

[0087] A judgment unit is used to judge whether the historical lightning data of the group of regions is available according to the lightning duration difference coefficient, and to judge whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold.

[0088] Optionally, the information acquisition module specifically includes:

[0089] A first acquisition unit, the first acquisition unit is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, and acquire a regional lightning data set;

[0090] The second acquisition unit is used to acquire regional environmental information, including regional terrain information and regional soil characteristic information, based on the regional information of the transmission line, perform lightning strike simulation on the transmission line based on the regional environmental information and the simulated lightning data, acquire lightning strike simulation data, and transmit it to the evaluation module.

[0091] Optionally, the evaluation module specifically includes:

[0092] A data evaluation unit, the data evaluation unit is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the lightning current rise time and the lightning current decay time calibrated by the third data set;

[0093] A transmission line assessment unit, the transmission line assessment unit is used to obtain a direct lightning strike risk index based on the transmission line lightning transient overvoltage data, obtain an induced electricity risk index according to the transmission line lightning overvoltage data, and obtain a transmission line lightning strike risk index based on the direct lightning strike risk index, the induced electricity risk index, the regional lightning strike frequency information and the direct lightning strike influence coefficient.

[0094] Compared with the prior art, the present invention has the following beneficial effects:

[0095] The present invention proposes a transmission line lightning strike simulation analysis method and system, which divides the regional lightning data set through lightning attribute characteristic quantities, realizes the analysis of lightning data, ensures the accuracy and stability of lightning data, improves the accuracy of subsequent lightning simulation, further adjusts the lightning current model through lightning data correction items and lightning current peak correction coefficients, reduces simulation errors, accurately evaluates the impact of lightning strikes on transmission lines through transmission line lightning strike risk indexes, improves the safety, stability and reliability of the power system, and reduces failures and losses caused by lightning strikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] Figure 1 A flow chart of a transmission line lightning strike simulation analysis method proposed by the present invention;

[0097] Figure 2 A flow chart for obtaining a lightning current model in the present invention;

[0098] Figure 3 A flow chart for obtaining the lightning current rise time and lightning current decay time in the present invention;

[0099] Figure 4 A flow chart for obtaining the lightning risk index of a power transmission line in the present invention;

[0100] Figure 5 This is a structural block diagram of a transmission line lightning strike simulation and analysis system proposed by the present invention. DETAILED DESCRIPTION

[0101] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0102] Reference Figure 1 - Figure 4 As shown, a transmission line lightning strike simulation analysis method in an embodiment of the present invention includes:

[0103] Acquire transmission line information, wherein the transmission line information includes transmission line parameter information and transmission line area information;

[0104] Collecting lightning information in the transmission line area to obtain a regional lightning data set, wherein the regional lightning data set includes several groups of regional historical lightning data;

[0105] Obtain lightning current model based on regional lightning dataset;

[0106] Specifically, based on the regional lightning dataset, a lightning current model is obtained, including:

[0107] According to the transmission line information, the transmission line parameters are analyzed to obtain the maximum current information of the transmission line;

[0108] According to the regional lightning data set, the lightning current waveform information, lightning current peak information and duration information corresponding to each set of regional historical lightning data are obtained;

[0109] Based on the maximum current of the transmission line, the duration is further divided to obtain the lightning current rise time and lightning current decay time;

[0110] Based on the ratio of the lightning current peak value and the lightning current rise time, the lightning current change rate is obtained;

[0111] The product of the lightning current peak value and the lightning current change rate is used as the lightning attribute characteristic quantity;

[0112] Based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning dataset, a box plot of lightning attribute characteristic quantity is obtained;

[0113] Based on the box plot analysis requirements, obtain the box plot outlier limit information, wherein the box plot outlier limit includes the box plot outlier lower limit and the box plot outlier upper limit;

[0114] According to the outlier boundary information of the box plot, the regional lightning dataset is divided to obtain the classification information of the regional lightning dataset;

[0115] The regional lightning data set classification includes a first historical lightning data set, a second historical lightning data set and a third historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​lower than the lower limit of the box plot outlier is classified into the first historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​higher than the upper limit of the box plot outlier is classified into the third historical lightning data set;

[0116] The lightning current model is obtained based on the classification information of the regional lightning dataset.

[0117] In this scheme, the product of the lightning current peak value and the lightning current change rate is used as the lightning attribute characteristic quantity. Based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, a box plot of the lightning attribute characteristic quantity is obtained. Based on the box plot analysis requirements, the box plot outlier boundary information is obtained. Through the box plot outlier boundary information, the regional lightning data set is divided, which is convenient for the subsequent analysis of lightning data and the selection of standard lightning data.

[0118] It can be understood that in the box plot of lightning attribute characteristics, the 25th percentile of the lightning attribute characteristics in the regional lightning dataset is taken as the lower quartile. , the 75th percentile of the lightning attribute characteristic quantity in the regional lightning dataset is taken as the upper quartile , then the interquartile range ;

[0119] In this embodiment, the box plot outlier lower limit , box plot outlier upper limit .

[0120] Specifically, the duration is further divided to obtain the lightning current rise time and lightning current decay time, which specifically includes:

[0121] Obtain duration information based on regional lightning datasets;

[0122] The time required for the current waveform to rise from the initial value of the lightning current to the peak value of the lightning current is taken as the rise time;

[0123] Based on the lightning current peak information and the maximum current information of the transmission line, the lightning current characteristic value and the transmission line current calibration value are obtained;

[0124] If the lightning current characteristic value is greater than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the transmission line current calibration value is taken as the decay time;

[0125] If the lightning current characteristic value is less than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the lightning current characteristic value is taken as the decay time.

[0126] In this scheme, the duration of lightning is divided by the peak value of lightning current, and the time required for the current waveform to rise from the initial value of lightning current to the peak value of lightning current is taken as the rise time, wherein the initial value of lightning current is 10% of the peak value of lightning current, the characteristic value of lightning current is 30% of the initial value of lightning current and the calibration value of transmission line current is 40% of the maximum current of transmission line. The lightning current attenuation time is obtained through the characteristic value of lightning current and the calibration value of transmission line current, thereby improving the accuracy and reliability of lightning data.

[0127] Specifically, according to the classification information of the regional lightning data set, the lightning current model is obtained, including:

[0128] According to the classification information of the regional lightning dataset, a first historical lightning dataset, a second historical lightning dataset and a third historical lightning dataset are obtained;

[0129] The historical lightning data of the area with the largest lightning current peak value in the first historical lightning data set is used as the lightning data of the first data set for calibration;

[0130] Calibrate the lightning data according to the first historical lightning data set and the first data set to obtain a lightning data correction item;

[0131] The average value of the lightning current peak value in the second historical lightning data set is used as the standard lightning current peak value;

[0132] Based on the standard lightning current peak, an initial lightning current model is constructed;

[0133] According to the second historical lightning data set, the initial lightning current model is adjusted to obtain a basic lightning current model;

[0134] Obtaining the average value of the lightning current rise time and the average value of the lightning current decay time in the second historical lightning data set, and using them as the third data set to calibrate the lightning current rise time and the lightning current decay time;

[0135] The third historical lightning data set is screened based on the lightning current rise time and lightning current decay time calibrated by the third data set;

[0136] Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained;

[0137] A lightning current model is obtained according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient.

[0138] In this scheme, the lightning data correction item is obtained by calibrating the lightning data with the first historical lightning data set and the first data set, and the initial lightning current model is adjusted by the second historical lightning data set to obtain the basic lightning current model. The lightning current peak correction coefficient is obtained based on the screened third historical lightning data set and the standard lightning current peak. The lightning current model is obtained according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient, thereby improving the authenticity of the lightning current model and ensuring the accuracy of the transmission line lightning strike simulation results.

[0139] According to the second historical lightning data set, the initial lightning current model is adjusted to obtain the basic lightning current model, specifically:

[0140] Based on the standard lightning current peak, construct the initial lightning current model:

[0141]

[0142] In the formula, is the lightning current at time t, and is the lightning current model attenuation parameter, is the standard lightning current peak value;

[0143] According to the second historical lightning data set and the initial lightning current model, the error function is constructed:

[0144]

[0145] In the formula, is the error function, represents the hth group of regional historical lightning data in the second historical lightning data set. The lightning current at the moment, is the total duration of lightning current, g is the total number of historical lightning data sets in the second historical lightning data set;

[0146] Based on the least squares method, Find the partial derivative and set it to zero to get the optimal fitting parameters .

[0147] Specifically, according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient, the lightning current model is obtained, which specifically includes:

[0148] According to the first historical lightning data set, obtaining the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set;

[0149] Aligning the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set with the peak moment of lightning current of the calibrated lightning data of the first data set;

[0150] Calibrate the lightning data according to the first data set, and obtain duration information in the calibrated lightning data of the first data set;

[0151] Calibrate the duration information in the lightning data and the first historical lightning data set according to the first data set to obtain a lightning data correction item;

[0152] Based on the calibrated lightning current rise time and lightning current decay time of the third data set, the lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set is obtained:

[0153]

[0154] In the formula, represents the lightning duration difference coefficient of the j-th group of regional historical lightning data in the third historical lightning data set, is the lightning current rise time of the jth group of regional historical lightning data in the third historical lightning data set, Calibrate the lightning current rise time for the third data set, is the lightning current decay time of the jth group of regional historical lightning data in the third historical lightning data set, calibrating a lightning current decay time for a third data set;

[0155] According to the lightning duration difference coefficient, determine whether the historical lightning data of the group of regions is available;

[0156] Among them, if , then remove the historical lightning data of this group of regions. , then the historical lightning data of this group of regions are available;

[0157] Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained;

[0158] Obtaining a lightning current model according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient;

[0159] The lightning data correction items are specifically:

[0160]

[0161] In the formula, is the lightning data correction item, is the first historical lightning data set for each i-th group of regional historical lightning data The lightning current value at the moment, The first dataset is used to calibrate the lightning data. The lightning current value at the time, d is the total duration of the lightning data calibrated by the first data set, and n is the total number of historical lightning data sets in the region in the first historical lightning data set;

[0162] The lightning current peak correction coefficient is specifically:

[0163]

[0164] Where k is the lightning current peak correction factor, is the lightning current peak influence coefficient of the jth group of regional historical lightning data in the third historical lightning data set after screening, is the peak value of lightning current of the jth group of regional historical lightning data in the third historical lightning data set after screening, is the standard lightning current peak value, where ,but ,like ,but , m is the total number of regional historical lightning data sets of the third historical lightning data set after screening;

[0165] The lightning current model is specifically:

[0166]

[0167] In the formula, is the lightning current at time t, and Lightning current model attenuation parameter, t is the time variable.

[0168] In this scheme, the lightning current peak moment of each group of regional historical lightning data in the first historical lightning data set is aligned with the lightning current peak moment of the calibrated lightning data of the first data set, and the lightning data correction item is obtained according to the duration information in the calibrated lightning data of the first data set and the first historical lightning data set. The lightning current peak correction coefficient is obtained based on the screened third historical lightning data set and the standard lightning current peak. The lightning current model is further adjusted through the lightning data correction item and the lightning current peak correction coefficient, thereby reducing the simulation error.

[0169] Based on the lightning current model, obtaining simulated lightning data, wherein the simulated lightning data represents lightning current data that changes with time;

[0170] Acquire regional environmental information according to the transmission line regional information, wherein the regional environmental information includes regional terrain information and regional soil characteristic information;

[0171] Performing lightning strike simulation on the transmission line according to the regional environmental information and the simulated lightning data to obtain lightning strike simulation data, wherein the lightning strike simulation data includes direct lightning strike simulation data and induced electricity simulation data;

[0172] Based on lightning strike simulation data, the transmission line is evaluated to obtain the transmission line lightning strike risk index;

[0173] According to the transmission line lightning risk index, it is determined whether the transmission line needs to be adjusted. If not, the lightning simulation data is recorded. If so, the transmission line is adjusted according to the lightning simulation data.

[0174] Specifically, according to the transmission line lightning risk index, it is judged whether the transmission line needs to be adjusted, including:

[0175] According to the lightning strike simulation data, direct lightning strike simulation data and induced electricity simulation data are obtained;

[0176] According to the direct lightning strike simulation data, the lightning strike transient overvoltage data of the transmission line is obtained;

[0177] Based on the lightning transient overvoltage data of transmission lines, obtain the direct lightning risk index;

[0178] Obtain the lightning overvoltage data of the transmission line based on the induced electricity simulation data;

[0179] Obtain the induced electricity risk index based on the lightning overvoltage data of the transmission line;

[0180] Acquiring regional lightning strike frequency information, wherein the regional lightning strike frequency information includes regional direct lightning strike frequency information and regional total lightning strike frequency information;

[0181] The ratio of the regional direct lightning strike frequency to the regional total lightning strike frequency is used as the risk coefficient of the direct lightning strike risk index;

[0182] According to the regional environmental information and based on expert evaluation, a direct lightning strike influence coefficient is obtained, wherein the direct lightning strike influence coefficient indicates the degree of influence of the regional environment on the probability of direct lightning strikes on the transmission line;

[0183] Based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning impact coefficient, the transmission line lightning risk index is obtained;

[0184] Based on the lightning safety requirements of the transmission line, the threshold of the lightning risk index of the transmission line is obtained;

[0185] According to the transmission line lightning risk index and the transmission line lightning risk index threshold, it is judged whether the transmission line needs to be adjusted. If the transmission line lightning risk index is lower than the transmission line lightning risk index threshold, the lightning strike simulation data is recorded. If the transmission line lightning risk index is higher than the transmission line lightning risk index threshold, the transmission line is adjusted according to the lightning strike simulation data.

[0186] Wherein, the transmission line lightning risk index is:

[0187]

[0188] In the formula, is the transmission line lightning risk index, is the direct lightning strike frequency in the area, f is the total lightning strike frequency in the area, is the direct lightning impact coefficient, is the maximum operating voltage of the transmission line, is the standard lightning current peak value, is the inductance per unit length of the transmission line, C is the capacitance per unit length of the transmission line, is the vacuum permeability, and , is the distance between the lightning strike point and the transmission line, and r is the height between the transmission line and the ground.

[0189] In this scheme, the transmission line lightning risk index is obtained through the direct lightning risk index, induced electricity risk index, regional lightning frequency information and direct lightning impact coefficient. The transmission line lightning risk index is used to accurately evaluate the impact of lightning strikes on transmission lines, thereby improving the safety, stability and reliability of the power system and reducing failures and losses caused by lightning strikes.

[0190] In this embodiment, the transmission line lightning risk index threshold is 1.37.

[0191] Reference Figure 5 As shown, further, in combination with the above-mentioned transmission line lightning strike simulation analysis method, a transmission line lightning strike simulation analysis system is proposed, including:

[0192] A main control module, the main control module is used to determine whether the group of regional historical lightning data is available according to the lightning duration difference coefficient, determine whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold, further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain the lightning attribute characteristic quantity box plot based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data;

[0193] An information acquisition module, the information acquisition module is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, acquire a regional lightning data set, acquire regional environmental information, including regional terrain information and regional soil property information, based on the transmission line area information, perform lightning strike simulation on the transmission line based on the regional environmental information and simulated lightning data, acquire lightning strike simulation data, and transmit the lightning strike simulation data to the evaluation module;

[0194] An evaluation module, wherein the evaluation module is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the calibrated lightning current rise time and lightning current decay time of the third data set, obtain a direct lightning risk index based on the lightning transient overvoltage data of the transmission line, obtain an induced electricity risk index based on the lightning overvoltage data of the transmission line, and obtain a transmission line lightning risk index based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning influence coefficient;

[0195] A display module interacts with the main control module and is used to display the lightning current model, lightning strike simulation data and the transmission line lightning strike risk index.

[0196] Main control module, including:

[0197] A control unit, wherein the control unit is used to further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain a box plot of the lightning attribute characteristic quantity based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data;

[0198] An information receiving unit, which interacts with the information acquisition module and the evaluation module to receive data and transmit it to the judgment unit;

[0199] A judgment unit is used to judge whether the historical lightning data of the group of regions is available according to the lightning duration difference coefficient, and to judge whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold.

[0200] Information acquisition module, specifically including:

[0201] A first acquisition unit, the first acquisition unit is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, and acquire a regional lightning data set;

[0202] The second acquisition unit is used to acquire regional environmental information, including regional terrain information and regional soil characteristic information, based on the regional information of the transmission line, perform lightning strike simulation on the transmission line based on the regional environmental information and the simulated lightning data, acquire lightning strike simulation data, and transmit it to the evaluation module.

[0203] Assessment modules include:

[0204] A data evaluation unit, the data evaluation unit is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the lightning current rise time and the lightning current decay time calibrated by the third data set;

[0205] A transmission line assessment unit, the transmission line assessment unit is used to obtain a direct lightning strike risk index based on the transmission line lightning transient overvoltage data, obtain an induced electricity risk index according to the transmission line lightning overvoltage data, and obtain a transmission line lightning strike risk index based on the direct lightning strike risk index, the induced electricity risk index, the regional lightning strike frequency information and the direct lightning strike influence coefficient.

[0206] In summary, the advantages of the present invention are: by taking the product of the lightning current peak value and the lightning current change rate as the lightning attribute characteristic quantity, the regional lightning data set is divided according to the lightning attribute characteristic quantity, and the classification information of the regional lightning data set is obtained. The lightning data analysis is realized through the regional lightning data set classification information, thereby ensuring the accuracy and stability of the lightning data and improving the accuracy of subsequent lightning simulation. The lightning current model is further adjusted through the lightning data correction term and the lightning current peak correction coefficient, thereby reducing the simulation error. The transmission line lightning risk index is obtained through the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning influence coefficient. Through the transmission line lightning risk index, the impact of lightning strikes on transmission lines is accurately evaluated, thereby improving the safety, stability and reliability of the power system and reducing failures and losses caused by lightning strikes.

[0207] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A transmission line lightning strike simulation analysis method, characterized in that: include: Acquire transmission line information, wherein the transmission line information includes transmission line parameter information and transmission line area information; Collecting lightning information in the transmission line area to obtain a regional lightning data set, wherein the regional lightning data set includes several groups of regional historical lightning data; Obtain lightning current model based on regional lightning dataset; Based on the lightning current model, obtaining simulated lightning data, wherein the simulated lightning data represents lightning current data that changes with time; Acquire regional environmental information according to the transmission line regional information, wherein the regional environmental information includes regional terrain information and regional soil characteristic information; Performing lightning strike simulation on the transmission line according to the regional environmental information and the simulated lightning data to obtain lightning strike simulation data, wherein the lightning strike simulation data includes direct lightning strike simulation data and induced electricity simulation data; Based on lightning strike simulation data, the transmission line is evaluated to obtain the transmission line lightning strike risk index; According to the transmission line lightning risk index, determine whether the transmission line needs to be adjusted. If not, record the lightning simulation data. If so, adjust the transmission line according to the lightning simulation data. The step of obtaining a lightning current model according to the regional lightning data set specifically includes: According to the transmission line information, the transmission line parameters are analyzed to obtain the maximum current information of the transmission line; According to the regional lightning data set, the lightning current waveform information, lightning current peak information and duration information corresponding to each set of regional historical lightning data are obtained; Based on the maximum current of the transmission line, the duration is further divided to obtain the lightning current rise time and lightning current decay time; Based on the ratio of the lightning current peak value and the lightning current rise time, the lightning current change rate is obtained; The product of the lightning current peak value and the lightning current change rate is used as the lightning attribute characteristic quantity; Based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning dataset, a box plot of lightning attribute characteristic quantity is obtained; Based on the box plot analysis requirements, obtain the box plot outlier limit information, wherein the box plot outlier limit includes the box plot outlier lower limit and the box plot outlier upper limit; According to the outlier boundary information of the box plot, the regional lightning dataset is divided to obtain the classification information of the regional lightning dataset; The regional lightning data set classification includes a first historical lightning data set, a second historical lightning data set and a third historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​lower than the lower limit of the box plot outlier is classified into the first historical lightning data set, and the regional historical lightning data set with lightning attribute feature values ​​higher than the upper limit of the box plot outlier is classified into the third historical lightning data set; Obtain lightning current model based on regional lightning data set classification information; The duration is further divided to obtain the lightning current rise time and the lightning current decay time, specifically including: Obtain duration information based on regional lightning datasets; The time required for the current waveform to rise from the initial value of the lightning current to the peak value of the lightning current is taken as the rise time; Based on the lightning current peak information and the maximum current information of the transmission line, the lightning current characteristic value and the transmission line current calibration value are obtained; If the lightning current characteristic value is greater than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the transmission line current calibration value is taken as the decay time; If the lightning current characteristic value is less than the transmission line current calibration value, the time required for the current waveform to decay from the lightning current peak value to the lightning current characteristic value is taken as the decay time; The step of obtaining a lightning current model according to the classification information of the regional lightning data set specifically includes: According to the classification information of the regional lightning dataset, a first historical lightning dataset, a second historical lightning dataset and a third historical lightning dataset are obtained; The historical lightning data of the area with the largest lightning current peak value in the first historical lightning data set is used as the lightning data of the first data set for calibration; Calibrate lightning data according to the first historical lightning data set and the first data set to obtain lightning data correction items; The average value of the lightning current peak value in the second historical lightning data set is used as the standard lightning current peak value; Based on the standard lightning current peak, an initial lightning current model is constructed; According to the second historical lightning data set, the initial lightning current model is adjusted to obtain a basic lightning current model; Obtaining the average value of the lightning current rise time and the average value of the lightning current decay time in the second historical lightning data set, and using them as the third data set to calibrate the lightning current rise time and the lightning current decay time; The third historical lightning data set is screened based on the lightning current rise time and lightning current decay time calibrated by the third data set; Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained; According to the first historical lightning data set, obtaining the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set; Aligning the peak moment of lightning current of each group of regional historical lightning data in the first historical lightning data set with the peak moment of lightning current of the calibrated lightning data of the first data set; Calibrate the lightning data according to the first data set, and obtain duration information in the calibrated lightning data of the first data set; Calibrate the duration information in the lightning data and the first historical lightning data set according to the first data set to obtain a lightning data correction item; Based on the calibrated lightning current rise time and lightning current decay time of the third data set, the lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set is obtained: Wherein, H(j) represents the lightning duration difference coefficient of the j-th group of regional historical lightning data in the third historical lightning data set, t1(j) is the lightning current rise time of the j-th group of regional historical lightning data in the third historical lightning data set, τ1 is the calibrated lightning current rise time of the third data set, t2(j) is the lightning current decay time of the j-th group of regional historical lightning data in the third historical lightning data set, and τ2 is the calibrated lightning current decay time of the third data set; According to the lightning duration difference coefficient, determine whether the historical lightning data of the group of regions is available; Among them, if H(j)>0.12, the historical lightning data of this group of regions are removed, and if H(j)≤0.12, the historical lightning data of this group of regions are available; Based on the screened third historical lightning data set and the standard lightning current peak value, a lightning current peak correction coefficient is obtained; Obtaining a lightning current model according to the lightning data correction item, the basic lightning current model and the lightning current peak correction coefficient; The lightning data correction items are specifically: Where T is the lightning data correction term, is the first historical lightning data set for each i-th group of regional historical lightning data The lightning current value at the moment, The first dataset is used to calibrate the lightning data. The lightning current value at the time, d is the total duration of the lightning data calibrated by the first data set, and n is the total number of historical lightning data sets in the region in the first historical lightning data set; The lightning current peak correction coefficient is specifically: where k is the lightning current peak correction factor, and ω(I j , I0) is the lightning current peak influence factor of the jth group of regional historical lightning data in the third historical lightning data set after screening, I j is the lightning current peak of the jth group of regional historical lightning data in the third historical lightning data set after screening, and I0 is the standard lightning current peak. Among them, if I j ≥I0, then If I j <I0, then m is the total number of groups of regional historical lightning data in the third historical lightning data set after screening; The lightning current model is specifically: I(t)=k·I0·(e -αt -and -βt )+T; Where I(t) is the lightning current at time t, α and β are the attenuation parameters of the lightning current model, and t is the time variable.

2. A transmission line lightning strike simulation analysis method according to claim 1, characterized in that: The step of judging whether the transmission line needs to be adjusted according to the transmission line lightning risk index specifically includes: According to the lightning strike simulation data, direct lightning strike simulation data and induced electricity simulation data are obtained; According to the direct lightning strike simulation data, the lightning strike transient overvoltage data of the transmission line is obtained; Based on the lightning transient overvoltage data of transmission lines, obtain the direct lightning risk index; Obtain the lightning overvoltage data of the transmission line based on the induced electricity simulation data; Obtain the induced electricity risk index based on the lightning overvoltage data of the transmission line; Acquiring regional lightning strike frequency information, wherein the regional lightning strike frequency information includes regional direct lightning strike frequency information and regional total lightning strike frequency information; The ratio of the regional direct lightning strike frequency to the regional total lightning strike frequency is used as the risk coefficient of the direct lightning strike risk index; According to the regional environmental information and based on expert evaluation, a direct lightning strike influence coefficient is obtained, wherein the direct lightning strike influence coefficient indicates the degree of influence of the regional environment on the probability of direct lightning strikes on the transmission line; Based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning impact coefficient, the transmission line lightning risk index is obtained; Based on the lightning safety requirements of the transmission line, the threshold of the lightning risk index of the transmission line is obtained; According to the transmission line lightning risk index and the transmission line lightning risk index threshold, it is judged whether the transmission line needs to be adjusted. If the transmission line lightning risk index is lower than the transmission line lightning risk index threshold, the lightning strike simulation data is recorded. If the transmission line lightning risk index is higher than the transmission line lightning risk index threshold, the transmission line is adjusted according to the lightning strike simulation data. Wherein, the transmission line lightning risk index is: Where W is the transmission line lightning risk index, f1 is the regional direct lightning frequency, f is the regional total lightning frequency, σ is the direct lightning impact coefficient, V0 is the maximum operating voltage of the transmission line, I0 is the standard lightning current peak, L is the inductance per unit length of the transmission line, C is the capacitance per unit length of the transmission line, μ0 is the vacuum permeability, and μ0 = 4π × 10 -7 H / m, R is the distance between the lightning strike point and the transmission line, and r is the height of the transmission line above the ground.

3. A transmission line lightning strike simulation analysis system, used to implement the analysis method according to any one of claims 1-2, characterized in that: include: A main control module, the main control module is used to determine whether the group of regional historical lightning data is available according to the lightning duration difference coefficient, determine whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold, further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain the lightning attribute characteristic quantity box plot based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data; An information acquisition module, the information acquisition module is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, acquire a regional lightning data set, acquire regional environmental information, including regional terrain information and regional soil property information, based on the transmission line area information, perform lightning strike simulation on the transmission line based on the regional environmental information and simulated lightning data, acquire lightning strike simulation data, and transmit the lightning strike simulation data to the evaluation module; An evaluation module, wherein the evaluation module is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the calibrated lightning current rise time and lightning current decay time of the third data set, obtain a direct lightning risk index based on the lightning transient overvoltage data of the transmission line, obtain an induced electricity risk index based on the lightning overvoltage data of the transmission line, and obtain a transmission line lightning risk index based on the direct lightning risk index, the induced electricity risk index, the regional lightning frequency information and the direct lightning influence coefficient; A display module interacts with the main control module and is used to display the lightning current model, lightning strike simulation data and the transmission line lightning strike risk index.

4. A transmission line lightning strike simulation analysis system according to claim 3, characterized in that: The main control module specifically includes: A control unit, wherein the control unit is used to further divide the duration based on the maximum current of the transmission line, obtain the lightning current rise time and the lightning current decay time, obtain a box plot of the lightning attribute characteristic quantity based on the lightning attribute characteristic quantity of each group of regional historical lightning data in the regional lightning data set, divide the regional lightning data set according to the outlier boundary information of the box plot, obtain the classification information of the regional lightning data set, obtain the lightning current model according to the classification information of the regional lightning data set, and adjust the transmission line according to the lightning simulation data; An information receiving unit, which interacts with the information acquisition module and the evaluation module to receive data and transmit it to the judgment unit; A judgment unit is used to judge whether the historical lightning data of the group of regions is available according to the lightning duration difference coefficient, and to judge whether the transmission line needs to be adjusted according to the transmission line lightning risk index and the transmission line lightning risk index threshold.

5. A transmission line lightning strike simulation analysis system according to claim 3, characterized in that: The information acquisition module specifically includes: A first acquisition unit, the first acquisition unit is used to acquire transmission line information, transmission line parameter information and transmission line area information, collect lightning information in the transmission line area, and acquire a regional lightning data set; The second acquisition unit is used to acquire regional environmental information, including regional terrain information and regional soil characteristic information, based on the regional information of the transmission line, perform lightning strike simulation on the transmission line based on the regional environmental information and the simulated lightning data, acquire lightning strike simulation data, and transmit it to the evaluation module.

6. A transmission line lightning strike simulation analysis system according to claim 3, characterized in that: The evaluation module specifically includes: A data evaluation unit, the data evaluation unit is used to obtain a lightning duration difference coefficient of each group of regional historical lightning data in the third historical lightning data set based on the lightning current rise time and the lightning current decay time calibrated by the third data set; A transmission line assessment unit, the transmission line assessment unit is used to obtain a direct lightning strike risk index based on the transmission line lightning transient overvoltage data, obtain an induced electricity risk index according to the transmission line lightning overvoltage data, and obtain a transmission line lightning strike risk index based on the direct lightning strike risk index, the induced electricity risk index, the regional lightning strike frequency information and the direct lightning strike influence coefficient.

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