基于小波变换的接触网故障检测新方法

A Novel Method of Fault Detection Based on Wavelet Transform in Overhead Contact Network

通过分析小波变换的原理及其算法,把小波的局部时-频特性与铁路接触网故障结合起来,用基数B-样条构造紧支集双正交小波提取故障时刻电流信号的瞬时特征量,提出了以此为基础的快速检测接触网故障的新方法。该方法有效地提高了检测的可靠性和快速性。本文应用PSCAD/EMTDC仿真获得故障电流数据,在MATLAB上实现小波变换分析算法,并介绍了门槛值的确定方法。根据仿真和计算结果得出结论。

By analyzing the theory and the algorithm of wavelet transform, the partial time-frequency characteristic of wavelet transform and the fault of railway＇s overhead contact network are well combined, the current signal＇s transient value at the time of fauh is picked up by constructing compact support set biorthogonal wavelet with cardinal B-spline, based on this, a novel method of fault detection in overhead contact network is presented. This novel method improves the reliability and the speediness of detection efficiently. PSCAD/EMTDC is applied to obtain the data of fault current, the analysis algorithm of wavelet transform is executed in MATLAB, and the way of confirming the threshold value is presented. All conclusions are obtained based on the results of simulation and calculation.