摘要
暂态信号分析是电力系统故障诊断和暂态保护的基础和依据,小波变换为暂态信号分析提供了强有力的数学工具。应用小波变换对超高压输电线路的暂态电压、电流分量进行分析和处理,提出了一种利用经小波滤波后综合电压量确定故障方向和相别,在电压增量中提取行波信号来快速计算故障距离的新方法。ATP-EMTP和Matlab/Wavelet Tool-box仿真结果表明,提出的保护方案具有很好的快速性和可靠性。
The analysis of power system transient signals is the basis of fault diagnosis and the transient protection theory. Wavelet transform is a powerful mathematic tool for transient signal analysis. In this paper, a novel high speed distance protection scheme for EHV transmission line protection based on transient signals wavelet transform is presented. The fault distance is estimated from the travelling waves directly. The relaying signals are processed using the wavelet transform instead of conventional filtering. At the same time, a new algorithm wavelet transform is proposed. The simulation results of ATP-EMTP and Matlab/Wavelet Tool- box show that the novel theory and the proposed methods are working fast and reliable.
出处
《华中电力》
2008年第4期22-25,共4页
Central China Electric Power
关键词
快速距离保护
超高压输电线路
小波变换
high speed distance protection
EHV transmission hnes
wavelet transform
