基于单端暂态能量谱相似性的配电网故障区段定位新方法  

A novel fault location method for power distribution systems using energy spectrum similarity analysis of single-terminal transient waveform

作　　者：朱占春 潘宗俊 唐金锐[2] 周海 袁成清[3] 闻生学 张新宇 ZHU Zhanchun;PAN Zongjun;TANG Jinrui;ZHOU Hai;YUAN Chengqing;WEN Shengxue;ZHANG Xinyu(Enshi Power Supply Company, State Grid Hubei Electric Power Co.,Ltd., Enshi 445099, China;School of Automation, Wuhan University of Technology,Wuhan 430070,China;School of Energy and Power Engineering, Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]国网湖北省电力有限公司恩施供电公司,湖北恩施445099 [2]武汉理工大学自动化学院,湖北武汉430070 [3]武汉理工大学能源与动力工程学院,湖北武汉430063

出　　处：《电力科学与技术学报》2021年第2期180-191,共12页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51707139)n。

摘　　要：故障行波在配电线路始端与不连续点之间来回反射,这些来回反射路径下的关联特征频率分量的能量明显强于其他频率分量的能量。根据配电网固有不连续点对应的特征频率划分频段。当故障发生在馈线始端附近、主干线路的2个分支点之间、分支点与负荷终端点之间这3类情况时,单端暂态波形在所划分频段的能量谱分布具有显著差异,据此可构建稳定可靠的故障区段定位算法。对记录的单端故障暂态波形能量谱与各区段典型位置对应的能量谱进行相似性比对,当能量谱差异指标小于自适应给定阈值时,即可判定故障区段。所提出的故障区段定位方法不受线路长度误差、导线换位、导线截面积不均匀等影响,定位可靠性高。仿真结果证明了该方法的正确性和可行性。The fault-generated traveling waves will bounce back and forth between the beginning point and the discontinuity points on the distribution line.The energy of frequency components in the corresponding characteristic which are related to such reflected paths will be significantly higher than that of other frequency components.The traveling waves are decomposed into different frequency bands according to the characteristic frequencies in discontinuity points of the distribution line which includes the branch points,the load terminal points,and the connection points of overhead lines and underground cables.The fault scenarios can be divided into three categories:the fault section around the beginning point,fault section between one and another branch point of the main power wire,and the fault section between one branch point and the terminal load.The energy spectrums within the divided frequency bands vary significantly in different scenarios,and thus these energy spectrum differences can be used to identify the location of fault sections.Once the fault occurred,the similarity between the energy spectrum of the recorded fault-generated waveforms and that corresponds to the typical positions was analyzed.The fault section can then be identified based on the constructed fault location criteria.Since the proposed method is not affected by of the following parameters of the distribution line,including the actual length error,incomplete transposition,and heterogeneous surface,the proposed method provides high reliability in the fault location.The simulation results have proved the accuracy and feasibility of the proposed fault section location method.

关 键 词：能量谱 配电网 故障定位 暂态行波 傅里叶变换 

分 类 号：TM863[电气工程—高电压与绝缘技术]