基于模糊熵双重判据的多分支配电线路故障区段定位方法  

Fault Section Location Method for Multi-branch Distribution Lines Based on Dual Fuzzy Entropy Criterion

作　　者：姜洪华 李晓晨[2] 刘晓军[2] 尤金石 王小林 方雅民 盛晓星 JIANG Honghua;LI Xiaochen;LIU Xiaojun;YOU Jinshi;WANG Xiaolin;FANG Yamin;SHENG Xiaoxing(State Grid Baishan Power Supply Company,Baishan 134300,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]国网吉林省电力有限公司白山供电公司,吉林白山134300 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《智慧电力》2025年第1期90-97,共8页Smart Power

基　　金：国家自然科学基金资助项目(52377170);国网吉林省电力有限公司科技项目(2024-33)。

摘　　要：为提高复杂拓扑结构下多分支配电线路发生单相接地故障时故障区段定位的准确度,提出了一种基于暂态零序电流的模糊熵(FurryEn)双重判据故障区段定位方法。首先,对小电流接地系统故障区段的暂态零序电流进行分析,得到不同拓扑下故障区段暂态零序电流特征与分支线路增加的关系。其次,利用自适应噪声完备集合经验模态分解(CEEMDAN)对暂态零序电流信号进行预处理,提取其高频部分。最后引入模糊熵来刻画暂态零序电流信号特征,构建模糊熵比值判据,作为故障区段定位的主判据;同时引入模糊熵波形的初始极性判据,作为辅助判据。通过PSCAD搭建的仿真模型验证表明该方法受分支线路增加、噪声的影响小,具有较强的适用性。In order to improve the accuracy of fault section location when a single-phase grounding fault occurs on a multi-branch distribution line under complex topology,the paper proposes a dual fuzzy entropy criterion based fault section location method based on transient zero-sequence current.Firstly,the transient zero sequence current of the fault section in a small current grounding system is analyzed to obtain the relationship between the characteristics of the transient zero sequence current of the fault section and the increase of branch lines under different topologies.Secondly,the transient zero-sequence current signal is preprocessed using the complete ensemble empirical modal decomposition with adaptive noise(CEEMDAN)to extract its high-frequency part.Finally,fuzzy entropy(FurryEn)is introduced to characterize the transient zero-sequence current signal characteristics,and the fuzzy entropy ratio criterion is constructed as the main criterion for the fault section location.At the same time,the initial polarity criterion for the fuzzy entropy waveform is introduced as the auxiliary criterion.The the simulation model validation in PSCAD shows that the method is less affected by the increase of the branch lines and noise,and has strong applicability.

关 键 词：多分支配电线路 故障区段定位 暂态零序电流 CEEMDAN 模糊熵 双重判据 

分 类 号：TM713[电气工程—电力系统及自动化]