基于小波模极大值极性的行波信号识别  

TRAVELING WAVE SIGNAL IDENTIFICATION BASED ON WAVELET POLARITY OF MODULUS MAXIMA

作　　者：艾斌[1] 吕艳萍[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2003年第5期55-57,71,共4页Power System Technology

摘　　要：对于行波保护,暂态信号的识别方法是非常关键的,尤其要正确区别正常操作(合闸于空载线路)和线路发生故障等相似的暂态过程。根据行波在波阻抗变化处折反射的规律,利用小波变换模极大值的极性关系可以实现行波信号的快速正确识别。EMPT仿真试验证明了这种方法的有效性和正确性。For traveling wave protection, the identification of transient signals is very important, especially it is very necessary to correctly discriminate the similar transient processes, such as the normal operation, e.g., switching on un-loaded transmission line, and fault occurring in transmission line. According to the refraction and reflection laws of traveling wave at the discontinuous point where the wave impedance varies and using the polarity relations of modulus maxima of wavelet transform, the traveling wave signals can be identified quickly and accurately. The effectiveness and correctness of this method is proved by EMTP simulation.

关 键 词：超高压输电线路 分布参数特性 行波信号 信号识别 小波变换模 极大值 极性 行波保护 

分 类 号：TM726.1[电气工程—电力系统及自动化]