摘要
提出了一种基于小波变换的无通道全线速动行波保护。它利用小波变换提取行波信号 ,利用阻波器对行波波头的平滑作用 ,通过计算初始行波波头的平缓程度判断故障是在区内还是在区外 :当波头非常陡时 ,判断为内部故障 ;当波头比较平滑时 ,判断为外部故障。理论分析和实际系统的EMTP仿真表明了该原理是正确、可行的。
Inceptive travelling wave is smoothed when it passes through the line trap. Based on the variation difference of inceptive travelling waves between internal and external faults, a wavelet and travelling wave based non-communication high speed transmission line protection is described in this paper. Steep inceptive wave means the internal faults while flat inceptive wave indicates the external faults. Wavelet transform is used to pick up travelling wave component and determine the time when the sharpest variation appears. Theoretical analysis and EMTP simulation have proved the correction and feasibility of this principle. This project is supported by National Natural Science Foundation of China (No. 59877020, No. 50077011).
出处
《电力系统自动化》
EI
CSCD
北大核心
2001年第10期18-22,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目! (5 98770 2 0 5 0 0 770 11)
关键词
行波保护
小波变换
超高速保护
线路保护
电力系统
距离保护
Computer simulation
Electric fault currents
Electric power system protection
Wavelet transforms
