摘要
针对电力电缆行波定位法中难以准确检测含噪行波的问题,提出了一种基于差分和变换的电缆故障行波定位方法。对故障行波进行前后向差分运算,得到行波差分和信号,无需对行波信号进行降噪处理;利用奇异值分解和自适应阈值量化处理以滤除行波差分和信号中的背景噪声,从而准确检测故障行波的奇异值时刻;采用两端测距法实现电缆故障的精确在线定位。最后通过仿真模型验证了所提方法的有效性和优越性。
In order to solve the problem that it is difficult to detect the noisy traveling-wave accurately in the fault location method of power cable,a traveling-wave location method based on difference summation transformation is proposed.The difference summation signal of travelingwave can be obtained by the forward and backward difference operation of the fault traveling-wave without noise reduction.Singular value decomposition and adaptive threshold processing are used to filter out the background noise of the difference summation signal of traveling-wave,thereby accurately detect the singular value time of the fault traveling-wave.The method of two-terminal location can realize the accurate on-line location of power cable fault.Simulation results show the effectiveness and superiority of the proposed method.
作者
田二伟
刘持涛
林顺富
TIAN Erwei;LIU Chitao;LIN Shunfu(The State Grid Zhejiang Zhuji Power Supply Co.,Ltd.,Zhuji,Zhejiang 311800,China;Shanghai University of Electric Power,Shanghai 200090,China)
出处
《上海电力大学学报》
CAS
2020年第5期461-465,共5页
Journal of Shanghai University of Electric Power
基金
国家自然科学基金(51977127)。
关键词
差分和变换
行波定位
奇异值分解
两端测距
difference summation transformation
traveling-wave location
singular value decomposition
two-terminal location
