基于多频带多特征融合的配电网单相接地故障选段方法  

Single-phase-to-ground fault section location method of distribution network based on multi-frequency band and multi-feature fusion

作　　者：肖文妍 郭谋发[1] 林佳壕 林骏捷 XIAO Wenyan;GUO Moufa;LIN Jiahao;LIN Junjie(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108)

机构地区：[1]福州大学电气工程与自动化学院,福州350108

出　　处：《电气技术》2024年第7期7-14,共8页Electrical Engineering

摘　　要：针对现有配电网单相接地故障选段方法存在的通信负担重、阈值设置困难及故障特征量单一等问题,提出一种基于多频带多特征融合的配电网单相接地故障选段方法。首先,利用小波包变换分别对故障后首半个工频周期的零序电压导数和零序电流进行分解和重构,得到原始波形的不同频带分量。其次,根据不同频带分量间的极性关系分别引入伏安特性特征向量与零序功率累加和作为故障特征。最后,筛选特征频带并构造基于特征频带与故障特征融合的选段判据。仿真实验及现场数据验证结果表明,所提方法能够有效实现单相接地故障免阈值就地选段。Aiming at the existing distribution network single-phase-to-ground fault section location method,which has problems such as heavy communication burden,difficulty in threshold setting,and a single amount of fault features,a distribution network single-phase-to-ground fault section location method based on multi-frequency band and multi-feature fusion is proposed.Firstly,the wavelet packet transform is used to decompose and reconstruct the derivative of the zero-sequence voltage and the zero-sequence current of the first half of the industrial frequency cycle after the fault,respectively,to obtain the different frequency band components of the original waveform.Secondly,the volt-ampere characteristic eigenvectors and zero-sequence power cumulative sum are introduced as fault characteristics according to the polarity relationship,respectively.Finally,the feature bands are screened and the section location criterion based on the fusion of feature bands and fault features is constructed.Simulation experiments and field data validation results show that the proposed method can effectively realize the threshold-free in local section location of single-phase-to-ground fault.

关 键 词：谐振接地系统 单相接地故障 故障选段 多频带多特征融合 免阈值 小波包变换 

分 类 号：TM862[电气工程—高电压与绝缘技术]