基于小波包多频带相关分析的故障选线方法

针对故障选线问题有许多的研究,提出了许多解决方案,但从现场使用情况看,基于不同原理的选线装置选线效果并不理想。因此,如何可靠的实现故障自动选线,有必要对其进行更深入的研究。本文针对传统小波变换在故障选线中的优缺点分析,提出一种基于小波包多频带相关分析的故障选线新方法。通过对各线路暂态零序电流进行一系列变换,得到各线路的故障测距系数,并按大小排序,其中最小值对应的线路即为故障线路。PSCAD仿真验证该方法正确有效。

A New Scheme to Faulty Line Selection Based on Wavelet Packets Technology and Correlation Analysis

For a long period, people have done a lot of research for the problem of fanh line detection, and pro- posed a number of methods. However, these devices based on different methods are not ideal from the actual use. Therefore, it＇s essential to do futher research on how to automatically and dependablely select fault line. The faulty line selection based on wavelet transform is an effective method, but it has poor anti -interference a- bility. To address this, a new fault line detection method is proposed by both wavelet packets technology and cor- relation analysis. We can get fault measures through a series transform of transient zero - sequence current, the smallest one is fault line. The simulation experiment based on PSCAD show that the accuracy and effectivity.