基于小波包-贝叶斯的小电流接地故障区域定位方法  

Localization method for small current grounding faults based on wavelet packet-Bayesian

作　　者：陈景文[1] 褚恩亮 李英春[1] 杨亚莉 CHEN Jingwen;CHU Enliang;LI Yingchun;YANG Yali(College Of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021,China;State Grid Shaanxi Electric Power Company Maintenance Company, Xi’an 710000, China)

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021 [2]国家电网陕西省电力公司检修公司,陕西西安710000

出　　处：《实验技术与管理》2019年第8期148-152,共5页Experimental Technology and Management

基　　金：国家自然科学基金资助项目(51577110);陕西科技大学校教学改革研究项目(17Y065)

摘　　要：为了解决配电网中性点经消弧线圈接地系统单相接地故障选线难、定位难的问题,提出一种基于小波包-贝叶斯的小电流接地故障区域定位方法。首先通过小波包变换获取故障暂态电流信号的频带能比因子、阻抗因子和能谱熵等3个属性,利用加权贝叶斯分类器可准确判别出系统的故障模式。根据所得故障模式即可进一步进行故障选线。在此基础上,利用波形辨识的方法对比各相邻波形间的邻点差异系数,定位出系统的故障位置。通过ATP和MATLAB联合仿真,验证了该方法在此类系统单相接地故障选线与定位中的快速性与有效性。In order to solve the problem of difficult line selection and location of single-phase grounding fault in neutral grounding system via arc suppression coil, a fault location method based on wavelet packet-Bayesian for small current grounding fault area is proposed. Firstly, three attributes of fault transient current signal, namely, band energy ratio factor, impedance factor and energy spectrum entropy, are obtained by wavelet packet transform. The fault mode of the system can be accurately identified by using the weighted Bayesian classifier, and fault line selection can be further carried out according to the fault modes obtained. Through the joint simulation of ATP and MATLAB, it is proved that this method is fast and effective in fault line selection and location of single-phase-to-ground fault in such system.

关 键 词：小电流接地 单相接地故障 小波包 贝叶斯 故障区域定位 

分 类 号：TP311.52[自动化与计算机技术—计算机软件与理论]