摘要
行波启动元件是超高速保护和行波测距中必不可少的组成部分,然而现有的行波启动算法存在故障时拒动的现象。该文从度量函数Lipschitz系数的小波理论出发,阐明常用的小波变换模极大值方法不能用于非孤立奇异信号的检测:推导出一种新型的信号检测方法——小波变换模之和(WTMS)法,以“影响锥”内小波变换模的积分来度量信号的奇异性;并结合对输电线故障行波波头奇异性特点的分析,提出了基于WTMS的行波启动算法,用以准确检测、区分故障行波与噪声干扰,从而弥补了以往行波启动算法的不足。人量的EMTP仿真数据和现场实录数据都验证了新故障启动算法的快速、可靠。
The traveling-wave-based starting element is indispensable for ultra-high-speed protection and fault location, however the previously proposed starting algorithms perhaps do not work in the case of some close-in faults. This paper illuminated that the signal non-isolated singularity of close-in faults cannot be characterized by using wavelet transform modulus maximum. Then a novel signal detection method was introduced, which measures the signal regularity by computing the wavelet transform modulus sum (WTMS) inside the corresponding 'cone of influence'. Therefore after analyzing the singularity features of the fault surge, the paper presented a new starting algorithm using WTMS, which can correctly distinguish fault traveling-waves from noise disturbances. Numerous tests with EMTP simulation data and field-recorded data show that the new starting algorithm makes up for deficiencies of other algorithms, and that the new algorithm is fairly fast and reliable.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第9期30-36,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50277027)~~
关键词
电力系统
行波保护
行波启动元件
算法
小波理论
继电保护
Electric power engineering
Power system
Starting element
Traveling-waves
Lipschitz exponent
WTMS
EMTP simulation
Field-recorded data
