摘要
针对高压输电线路行波测距法中不易精确检测含噪行波的问题,提出一种新的行波奇异点检测方法。对于含噪故障行波信号,其奇异点处前向差分和后向差分之和不为零,通过求解一段时间视窗内以奇异点时刻为中心的行波差分和,得到行波的差分和信号,且无需对行波信号降噪处理。基于奇异值分解降噪和Donoho阈值处理,可将差分和信号中噪声全部滤除,从而获得精确的行波奇异点时刻。采用三个测点行波测距算法,可实现行波波速在线计算和精确的测距结果。仿真结果验证了该方法的正确性和有效性。
Aiming at the issue of accurately detecting noisy traveling waves in the traveling wave ranging method of high-voltage transmission lines,a new method for detecting traveling wave singular points is proposed.For the noisy fault traveling wave signal,the summation of the forward difference and the backward difference at the singular point is not zero.By solving the difference between the traveling wave and the center of the singular point in the window for a period of time,the difference and the signal of the traveling wave are obtained,and the traveling wave signal is not required to be denoised.Based on singular value decomposition noise reduction and Donoho threshold processing,all noise in the difference summation signal can be filtered out to obtain accurate traveling wave singular point moments.The three-point traveling wave ranging algorithm can realize on-line calculation of traveling wave velocity and accurate ranging results.Simulation results verify the correctness and effectiveness of the proposed method.
作者
曹雨
林顺富
于俊苏
李东东
CAO Yu;LIN Shun-fu;YU Jun-su;LI Dong-dong(College of Electric Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《水电能源科学》
北大核心
2019年第12期171-175,共5页
Water Resources and Power
基金
上海市人才发展基金(2018004)
上海市教委曙光计划(15SG50)
关键词
行波检测
差分和变换
奇异值分解
阈值
故障测距
traveling-wave detection
difference summation transformation
singular value decomposition
threshold
fault locating
