摘要
介绍了连续小波变换定义、基于多分辨分析的Mallat快速小波分解算法。基于超高压 (EHV)输电线路故障暂态电流的特点和暂态保护的基本原理 ,充分利用小波分析的时频局部化特点 ,建立了基于小波分析的暂态保护启动判据和跳闸判据。借助EMTDC仿真分析软件 ,研究了一实际电网EHV输电线路故障电弧特点和在不同故障条件下保护判据的有效性。结果表明 ,基于小波分析的暂态保护方案是可行的。
The continuous wavelet transform, Mallat fast decomposition algorithm based on multiresolution analysis is introduced. According as the character of EHV transmission line fault transient current, based on the time and frequency localization character of wavelet transform. a new non-unit transient protection criterion based on wavelet analysis are established, and the base option rules are briefly set forth By virtue of the EMTDC, The simulation study of a real system declared the character of fault arc and the validity of protection criterion facing to change fault conditions, so the protection scheme is feasible.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2001年第10期10-14,19,共6页
Proceedings of the CSEE
基金
国家自然科学基金资助项目 ( 5 99770 19)~~
关键词
输电线路
小波分析
单端量暂态保护
继电保护
wavelet analysis
mallat algorithm
transient protection
protection criterion
