Lightning overvoltage calculation method based on full-wave electromagnetic transient model

Abstract

The invention discloses a lightning overvoltage calculation method based on a full-wave electromagnetic transient model. The method comprises the following steps of 1, by regarding lightning current, a power transmission line, a pole tower and a pole tower grounding net as conductors, building a full-wave electromagnetic wave pause model integrating the power transmission line, the pole tower and a grounding electrode; 2, performing frequency domain and time domain conversion on lightning voltage or lightning current to obtain time domain signals of the lightning voltage or the lightning current; 3, calculating the impact response characteristic of the pole tower by using a moment method; obtaining the distribution of leakage current on the pole tower and conductor section potential; 4, obtaining voltage on a pole tower cross arm conductor according to the leakage current of each conductor section and the conductor section potential, wherein a difference value of the voltage on the pole tower transverse beam conductor and the operation voltage of the power transmission line is the voltage value. The method provided by the invention has the advantages that the lightning overvoltage calculation precision can be improved; the reliable technical support is provided for the electric power system lightning protection; the feasible lightning protection technical scheme can be favorably made.

Description

technical field [0001] The invention belongs to the technical field of lightning protection and grounding of power systems, and in particular relates to a lightning overvoltage calculation method based on a full-wave electromagnetic transient model. Background technique [0002] Lightning strike transmission lines is a complex electromagnetic transient process, but due to the limitation of calculation methods and computer development level, a lot of simplifications have been made in theoretical research methods, making the calculation accuracy of lightning overvoltage difficult to meet engineering needs. Reducing lightning overvoltage during lightning strikes is one of the main goals of lightning protection transformation of power systems. The national electric power industry invests billions of yuan in lightning protection transformation every year. Although it has a certain effect, it is not ideal. The reason is that, on the one hand, the complexity and uncertainty of the ...

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Problems solved by technology

[0006] In order to solve the problem of inaccurate calculation results caused by the use of circuit models in the study of lightning overvoltage of transmission lines, and also to solve the problem of inaccurate calculation models caused by lightning conductor shunting in the characteristic analysis of tower impulse response, the present invention is based on the full wave The analytical method establishes a full-wave electromagnetic transient model integrating transmission lines, towers and grounding electrodes, and calculates lightning overvoltage based on the established full-wave electromagnetic transient model

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