一种用于局部放电信号分析的维格纳分布交叉项抑制方法  

A WVD′s Cross-term Suppressing Method for Partial Discharge Signal Analysis

作　　者：范佳兴 范杰清[2] FAN Jiaxing;FAN Jieqing(Hohhot Power Supply Bureau,Inner Mongolia Power(Group)Company Ltd,Inner Mongolia Hohhot 010000,China;School of Electrical and Electronic Engineering,North China Electric Power Universty,Beijing 102206,China)

机构地区：[1]内蒙古电力(集团)有限责任公司呼和浩特供电局,内蒙古呼和浩特010000 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《河北师范大学学报（自然科学版）》2020年第6期500-506,共7页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(U1730247,11571047,61372050)。

摘　　要：电力设备介质局部击穿产生的放电信号是一种非平稳随机信号.为获得其时频信息,提出了一种维格纳分布交叉干扰项的抑制方法.该方法从维格纳分布时频平面截取数据段进行多项式拟合,根据拟合残差定位交叉干扰项并用二值化数组加以抑制.仿真结果表明,所提出的改进方法在保持维格纳分布自项的同时有效抑制了交叉干扰项,为局部放电信号的时频域分析提供了一种有效方法.The partial discharge signal produced by partial breakdown of insulating medium is a kind of non-stationary random signal.To obtain the time-frequency domain information of partial discharge signal,a suppressing method for WVD(Wigner-Ville distribution)cross-term is proposed.Data segments of the WVD time-frequency plane were used for polynomial fitting.Fitting residual was used in locatingcross-terms which were suppressed by a binary array.The simulation results show this method not only reduces the interfering cross-terms but also preserves the auto-term of the WVD.The improved method is an effective way for partial discharge signal analyzing in time-frequency domain.

关 键 词：局部放电 维格纳分布 交叉干扰项 多项式拟合 

分 类 号：TN911.7[电子电信—通信与信息系统]