小波阈值降噪在输电线路短路故障中的应用  

Application of Wavelet Threshold De-noising in Transmission Line Short-circuited Fault

作　　者：甄兰兰[1] 黄自元[1] 周建萍[1,2] 

机构地区：[1]上海电力学院电力与自动化工程学院,上海200090 [2]同济大学电子与信息工程学院,上海200092

出　　处：《太原理工大学学报》2009年第3期294-296,共3页Journal of Taiyuan University of Technology

基　　金：上海市教育委员会重点学科建设项目资助(J51301);国家自然科学基金(60674076);上海市教委优青后备基金(Z2006-78)

摘　　要：输电线路的破坏多半是由短路故障引起的,通过分析短路故障,采用小波分层阈值对故障后的短路电流进行降噪。笔者依据实际电力系统输电线路进行短路故障实例仿真,仿真结果表明小波分层阈值不但能有效对故障后的短路电流进行降噪,而且其降噪后的均方误差比小波全局阈值降低了45.9%,从而为下一步故障测距提供有利依据。Transient signal is abrupt and singular after transmission line faults occur. And the signal contains abundant fault information. Transmission line damage is mostly caused by short-circuited fault. The short-circuited fault was analyzed and then fault current was de-noised using wavelet hierachical threshold. According to the actual power system transmission line, short-circuited fault simulation was set up. The simulation results show that wavelet hierachical threshold de-noises effectively the short-circuited current of transmission line and mean square error of wavelet hierachical threshold decreases by 45.9 % compared with wavelet global threshold, which provides support for next fault location.

关 键 词：小波 输电线路 短路电流 降噪 阈值 

分 类 号：TM726[电气工程—电力系统及自动化]