摘要
分析了输电线路在发生两相接地故障时,永久性故障与瞬时性故障自振电压的特性,提出一种基于小波能量熵的自适应三相重合闸故障类型的判别方法。对采集到的故障后电压信号进行5层小波分解,提取相应的熵值,通过比较熵值的大小来区分故障的类型。理论分析和大量MATLAB仿真实验表明,该方法对于三相重合情况下判别故障类型具有较好的效果。
The formation of the natural vibration voltage in temporary and permanent two-phase faults was analyzed. A novel method, which bases on the wavelet energy entropy to identify fault types for the adaptive three-phase reclosure on transmission lines, was proposed. The five-layer wavelet decomposition of the acquired post-fault votage signal was performed and the entropy was extracted and then was compared with entropy to detect fault types. Theoretical analysis and lots of MATLAB simulation experiments expatiated that this method can discriminate the type of faults under three-phase reclosing condition and has better effect.
出处
《辽宁工业大学学报（自然科学版）》
2009年第1期27-29,共3页
Journal of Liaoning University of Technology(Natural Science Edition)
关键词
三相重合闸
故障识别
小波能量熵
小波变换
three-phase reclosure
fault identification
wavelet energy entropy
wavelet transfer
