基于互补集合经验模态分解与样本熵算法的接地系统故障选线研究  

Fault Line Selection of Grounding System Based on CEEMD and Sample Entropy Algorithm

作　　者：马超 林希 刘振祥 Ma Chao;Lin Xi;Liu Zhen-xiang(Jiangmen Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Jiangmen 529000,China;Guangzhou Sitai Information Technology Corporation,Guangzhou 510006,China)

机构地区：[1]广东电网有限责任公司江门供电局,广东江门529000 [2]广州思泰信息技术有限公司,广东广州510006

出　　处：《广东工业大学学报》2023年第5期94-101,共8页Journal of Guangdong University of Technology

基　　金：南方电网公司科技项目(GDKJXM20200681)。

摘　　要：针对中性点经消弧线圈接地的配电网接地系统在发生单相接地故障时存在故障电流特征不明显、阈值整定困难和故障选线准确性不高等问题,本文提出一种无阈值的基于互补集合经验模态分解(Complementary Ensemble Empirical Mode Decomposition,CEEMD)与样本熵的故障选线方法。通过研究故障线路零序电流暂态特性,选定震荡和衰减特征的高频分量作为观测对象,提出基于CEEMD算法的高频分量快速提取方法及故障表征策略,探究基于高频分量的样本熵作为无阈值选线判据的可靠性。模拟建立多场景扰动下中性点经消弧线圈接地系统模型,验证了所提算法在不同线路位置、故障合闸角、接地电阻和消弧线圈补偿度等工程场景下应用的可行性。其中,所提的算法能够实现仅采集半个周期电流的快速故障选线,并且该方法无需设置阈值,不受系统不同运行方式影响,易于多场景故障选线的工程应用。For the resonant grounding system of the distribution network with the neutral point grounded through the arc suppression coil,there are problems such as inconspicuous fault current characteristics,difficulty in threshold setting and low accuracy of fault line selection when a single-phase grounding fault occurs.In this research,a threshold-free fault line selection method based on Complementary Ensemble Empirical Mode Decomposition(Complementary Ensemble Empirical Mode Decomposition,CEEMD)and sample entropy is proposed.By analyzing the transient characteristics of the zero-sequence current of the fault line,the highfrequency components of the oscillation and attenuation characteristics are selected as the observation objects.A fast extraction method and fault characterization strategy of high-frequency components based on CEEMD algorithm are proposed,and the reliability of sample entropy based on high-frequency components as a thresholdfree line selection criterion is explored.The resonant grounding system model under disturbance under multiple scenarios is simulated and established,and the feasibility of the proposed algorithm in engineering scenarios such as different line positions,fault closing angle,grounding resistance and arc suppression coil compensation degree is verified.Among them,the proposed algorithm can realize fast fault line selection that only collects half-cycle current.In addition,the method does not need to set a threshold value,and is not affected by different operating modes of the system,which is easy for engineering application of multi-scenario fault line selection.

关 键 词：配电网 中性点经消弧线圈接地系统 单相接地故障选线 互补集合经验模态分解 样本熵 

分 类 号：TM862[电气工程—高电压与绝缘技术]