基于五次谐波特征数据的配网单相接地故障识别方法  

Single-phase Grounding Fault Identification Method of Distribution Network Based on the Fifth Harmonic Characteristic Data

作　　者：徐桂培 吴小宁 张国龙 赖洁文 XU Guipei;WU Xiaoning;ZHANG Guolong;LAI Jiewen(Yunfu Yunan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Yunfu 527199,China)

机构地区：[1]广东电网有限责任公司云浮郁南供电局,广东云浮527199

出　　处：《电工技术》2021年第4期70-72,76,共4页Electric Engineering

摘　　要：针对配网经常发生的单相接地故障,提出了一种基于五次谐波特征数据的故障识别方法。首先分析了配网接地故障的特点以及故障相和非故障相五次谐波相量的关系。对小波包能量计算进行了说明,提出了基于小波包能量的利用五次谐波电压和电流的接地故障辨识方法,通过提取零序电流中的五次谐波,并对小波包分解得到总能量值,从而实现对故障线路的选线。最后针对具体算例对所提方法进行了仿真,说明了所提方法的有效性。Aiming at the single-phase grounding faults that often occur in distribution networks,a fault identification method based on the fifth harmonic characteristic data is proposed.First,the characteristics of the ground fault in the distribution network and the relationship between the phasor of the fifth harmonic of the fault phase and the non-fault phase are analyzed.The calculation of wavelet packet energy is introduced,and a ground fault identification method using the fifth harmonic voltage and current based on wavelet packet energy is proposed.The total energy is obtained by extracting the fifth harmonic from the zero-sequence current and decomposing the wavelet packet value,so as to realize the fault line selection.Finally,the proposed method is simulated for a specific example,which shows the effectiveness of the proposed method.

关 键 词：单相接地故障 配网故障 五次谐波 小波分解 

分 类 号：TM77[电气工程—电力系统及自动化]