摘要
提出了一种基于单端电流暂态信号小波变换的超高压输电线路快速保护方案。利用单端暂态电流信号的小波变换模极大值,对电流信号的李氏指数进行最小二乘法估计,来判断故障线路。通过大量ATP仿真证明,在各种故障情况下该保护算法能准确、可靠地动作。
In this paper, a new high-speed protection scheme for EHV transmission line based on the wavelet transform of transient current signals from one end of the line is presented. With the wavelet modulus maxima of oneterminal transient current, the Lipschitz exponent of transient current signals is estimated by using least square method, then the fault line and non-fault line are distinguished. A large of ATP simulation results prove that the protection scheme can delimitate between faulty lines and non-faulty lines accurately and reliably.
出处
《现代电力》
2006年第6期21-24,共4页
Modern Electric Power
关键词
EHV输电线路
暂态电流
小波变换
李氏指数
EHV transmission line
transient current
wavelet transform
Lipschitz exponent
