摘要
由于并联电抗器两侧的电流发生变化,传统的行波差动保护无法应用于带并联电抗器的输电线路。针对这个问题,文中将基于小波变换的行波差动保护应用于带并联电抗器的线路,深入分析了带并联电抗器线路上的波过程和并联电抗器对基于小波变换的波头提取算法的影响,结果表明并联电抗器不影响行波波头大小,对波头的提取造成的误差极小,因而基于小波变换的行波差动保护能够适用于带并联电抗器的输电线路。EMTP仿真验证了该保护在带并联电抗器的输电线路上具有优良性能。
Because of the current on the shunt reactor, traditional traveling wave differential protection cannot be applied to transmission line with shunt reactor. To solve this problem, this paper studies the application of traveling wave differential protection based on wavelet transform on this type of lines. The propagation of traveling wave on transmission line with shunt reactor and the effects of the reactor on the calculation of wavefronts are analyzed in details. The results show that the reactor has no influence on the magnitude of wavefronts, and causes only tiny calculation error. Hence the traveling wave differential protection based on wavelet transform can be applied on the transmission line with shunt reactor. EMTP simulations prove the arguments.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第23期41-44,70,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50077011
50377019)国家自然科学基金国际合作基金资助项目(50140430686)
关键词
行波差动保护
并联电抗器
小波变换
traveling wave differential protection
shunt reactor
wavelet transform
