电测与仪表Issue(2)：50-53,90,5.
基于小波多分辨率分析的输电线距离保护
Distance Protection for Transmission Lines Based on Wavelet Multi-Resolution Analysis
摘要
Abstract
During the transient period after a fault in the transmission line occurs, the estimated resistance and reactance of faulty transmission line, which are obtained from differential equation algorithm (DEA), show the characteristics of attenuate oscillating. In order to improve the performance of DEA based distance relaying, it is necessary to remove high frequency components from the estimates. A method which utilizes wavelet multi-resolution analysis technology is suggested to process the results estimated by DEA. The Daubechies wavelets are applied to analysis the sequences which consist of the results from DEA. The sequences are decomposed and emerged as approximations and details, and the estimated resistance and reactance are reconstructed from the approximations. Quick evaluation of the impedance after fault occurred is achieved with high accuracy. PSCAD/EMTDC simulation results show that the relay can trip rapidly and reliably, and its performance is little influenced by various factors such as different fault inception angles and fault distances.关键词
小波多分辨率分析/微分方程算法/距离保护/输电线路Key words
wavelet multi-resolution analysis/differential equation algorithm/distance relay/transmission lines分类
信息技术与安全科学引用本文复制引用
刘兴茂..基于小波多分辨率分析的输电线距离保护[J].电测与仪表,2014,(2):50-53,90,5.基金项目
成都信息工程学院科研基金资助项目 （）
