Evaluation method of lightning disturbance risk of power transmission line section

Abstract

The invention relates to an evaluation method of a lightning disturbance risk of a power transmission line section. Line basic information, line geographic information, line structure characteristic information, and line insulation characteristic information are employed; a lightning parameter statistics analysis program is employed to obtain a lightning parameter of a line corridor within a designated time slot and the obtained lightning parameter are used as an evaluation parameter; a lightning protection simulation calculating program is used to carry out calculation to obtain lightning stroke trip-out rates of all towers; a whole line average lightning stroke trip-out rate value that is obtained by calculation is used as a reference value to carry out comparison, so that lightning disturbance risk levels of all the towers relative to the whole line within a designated time slot are obtained; on the basis of a hierarchical structure model, an improved hierarchical analysis calculation program is used to carry out calculation to obtain weight vectors of all lightning disturbance risk level tower percentages by all sections; with regard to different influence degrees of towers with different lightning disturbance risk levels on a lightning disturbance risk, the improved hierarchical analysis calculation program is continued to be used to carry out calculation so as to obtain weight vectors of the towers with the different lightning disturbance risk levels; and then a computer is used to carry out combination on the weight vectors of all the layers from top to bottom to obtain lightning disturbance risk evaluation results of all the sections.

Description

technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a method for assessing the risk of lightning damage in transmission line sections, which is applicable to the assessment of flash-prone sections of high-voltage transmission lines, ultra-high-voltage transmission lines and ultra-high-voltage transmission lines in power systems. Background technique [0002] The transmission line is an important part of the power grid, and the safe and stable operation of the transmission line directly affects the stability of the power grid and the reliability of power supply. At present, lightning accidents on transmission lines are becoming more and more serious. According to statistics, the number of line trips caused by lightning strikes in my country accounts for 60% to 70% of the total number of line trips. It can be seen that lightning strikes are an important factor causing transmission line trips. Preventing lightning accid...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that it cannot accurately reflect the strength of the mine damage risk of each tower section

Its shortcoming is that it cannot effectively assess the risk of lightning damage in each section of the line for lines with complex terrain conditions and tower structures

[0007] The applicant found through research that the first method is based on the calculation results of the lightning tripping rate of the entire transmission line base-by-base tower, and evaluates the lightning hazard risk of the section by calculating the average value of the lightning tripping rate of all towers in each section. It is a simple arithmetic average method to obtain the average lightning strike trip rate of each tower section, but in the process of arithmetic average, individual differences may be ignored, and it is easily affected by extreme values, and there is a certain error, which cannot accurately reflect each tower. The intensity of lightning damage risk in the section

The second method is based on the statistical results of lightning parameters in the line corridor, and determines the lightning weak section in the line through the size of the ground flash density in each section. This method only considers the characteristics of lightning activity in the line corridor, ignoring the line structure and topographic features. Factors, the weak section obtained is the section susceptible to lightning strikes in the line, that is, the section that is easy to strike, not the section that is easy to flash. Using this method for lines with complex terrain conditions and tower structures cannot effectively evaluate the lightning hazard risk of each section of the line.

So far, there is no effective method for assessing the lightning risk of each tower section that can comprehensively consider the differences in the lightning activity of the line corridor, topographic features, line structure and insulation configuration, and lightning protection measures. Urgent need for change

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