漏电排查系统中漏电电流基波和谐波分量分离方法  

Method for separation of base and harmonious wave component of leakage current in the leakage detection system

作　　者：杨帅 张治国 黄治国 李政廉 YANG Shuai;ZHANG Zhiguo;HUANG Zhiguo;LI Zhenglian(Yiyang Power Supply Branch,State Grid Hunan Electric Power Co.,Ltd.,Yiyang 413000,China;Hunan Power Transmission and Transformation Engineering Co.,Ltd.,Changsha 410015,China)

机构地区：[1]国网湖南省电力有限公司益阳供电分公司,湖南益阳413000 [2]湖南省送变电工程有限公司,湖南长沙410015

出　　处：《电力科学与技术学报》2020年第6期180-186,共7页Journal of Electric Power Science And Technology

基　　金：国网湖南省电力公司科技项目(5216AB50009);湖南省重点实验室开放研究基金(5216A01600VZ)。

摘　　要：为了能够快速排查漏电点,漏电排查系统在低压配电台区(简称“台区”)被广泛使用。由于台区存在非线性负荷所造成的零序谐波,严重降低了漏电排查系统的漏电电流检测精度,且现有的频域滤波方法难以准确测量暂态漏电电流。因此,提出一种漏电电流基波和谐波分量分离的方法,即单相d-q变换滤波法,相对于频域滤波方法,该方法能够对台区线路中的零序谐波进行较好抑制,同时又不会造成暂态漏电电流基波幅值的衰减,解决了漏电排查系统检测漏电电流时受零序谐波干扰的问题,并用MATLAB软件仿真验证该文方法的可行性。In order to quickly check the leakage point,the leakage detection system is widely used in the low voltage radio station area("station area").Due to the zero-order harmonic caused by the nonlinear load in the station area,the accuracy of leakage current detection in the leakage detection system is seriously reduced,and the existing frequency domain filtering method is difficult to measure the transient leakage current accurately.Therefore,a separation method of leakage current base wave and harmonic component is proposed,that is,a single-phase d-q transformation filtering method.Comparing with the frequency domain filtering method,It can suppress the zero-order harmonics in the station line well without causing the attenuation of the temporary leakage current base wave value.The leakage current is detected by the leakage system and the problem of zero-order harmonic interference is then solved.The feasibility of the method is verified by MATLAB software simulation finally.

关 键 词：漏电排查系统 频域滤波 零序谐波 漏电电流 

分 类 号：TM930[电气工程—电力电子与电力传动]