Identification of Lightning Strike on ±800kV UHVDC Transmission Line Based on the PSCAD

Abstract

This paper proposed an effective method of lightning stroke recognition. The characteristic of non-faulty lightning is that the correlation degree with the axis voltage approaches 1.This feature can identify lightning interference. The characteristic of the lightning failure is that when the flashover occurs, a large number of high frequency components in the lightning wave are immediately reduced; the characteristic of the ground fault is that contain less high frequency components. After wavelet transform, the ratio of high-frequency components caused by lightning stroke to middle and low frequencies components is larger than that of ground fault. This feature can be used to identify lightning fault and ground fault. This paper is based on the model of ±800kV UHVDC power transmission project from Yunnan to Guangdong, and simulation results show that the proposed method is effective.