基于离散小波变换的输电线路故障检测研究

Research on transmission line fault detection based on discrete wavelet transform

针对输电线路故障检测问题,文中提出了一种利用小波变换检测高阻抗输电线路故障(HIF)的新方法,采用基于离散小波变换(DWT)的多分辨率信号分解(MSD)中系数的绝对值,结合故障指示器和故障判据来检测输电线路中的HIF,该方法对故障类型、故障起始角、故障电阻和故障定位具有较强的鲁棒性。在典型的400kV输电线路系统的各种故障条件下测试了所提出方法的性能。

Aiming at the problem of transmission line fault detection,a new method of high impedance transmission line fault(HIF) detection based on wavelet transform is proposed in this paper.The absolute value of coefficients in multi-resolution signal decomposition(MSD) based on discrete wavelet transform(DWT) is used to detect HIF in transmission line with fault indicator and fault criterion.This method can detect fault type,fault start angle and fault reason,and have strong robustness.The performance of the proposed method is tested under various fault conditions of a typical 400 KV transmission line system.