基于锁相环的故障选线综合比较法研究  

Study on Fault Line Selection Based on Phase-locked Loop Comprehensive Comparative

作　　者：曹令军 李春华 石磊 殷庆斌 邢晓敏[2] 丁震宇 CAO Lingjun;LI Chunhua;SHI Lei;YIN Qingbin;XING Xiaomin;DING Zhenyu(State Grid Baishan Power Supply Company,Baishan 134300,China;Northeast Electric Power University School,Jilin 132012,China)

机构地区：[1]国网白山供电公司,吉林白山134300 [2]东北电力大学,吉林吉林132012

出　　处：《吉林电力》2019年第4期5-8,共4页Jilin Electric Power

摘　　要：针对配电网发生单相接地故障时,一般的滤波器直接提取五次谐波会附带产生其他频次谐波,严重影响五次谐波选线准确率的问题,利用锁相环对故障电流的频率和相位进行跟踪,而后进行五次谐波选线分析;同时,为了提高五次谐波选线的灵敏性,采用数据幅值极性综合比较法。通过对仿真波形及数据的分析,得出锁相环提取出的故障电流中五次谐波含量远多于其他次谐波含量,检测到的故障线路电流恰好为其他非故障线路电流之和,并且相位相反,有效地提高了故障选线的准确率。When single-phase grounding fault occurs in distribution network,the filter directly extracts the fifth harmonic which will produce other frequency harmonics,seriously affecting the accuracy of the fifth harmonic line selection.Phase-locked loop is used to track the frequency and phase of the fault current,and then the fifth harmonic line selection analysis is carried out.At the same time,in order to improve the fifth harmonic line selection.The sensitivity of line selection is based on the comprehensive comparison method of data amplitude polarity.Through the analysis of simulation waveform and data,it is concluded that the fifth harmonic content of fault current extracted by PLL is much more than that of other sub-harmonics.The detected fault line current is the sum of other non-fault line currents,and the phase is opposite,which effectively improves the accuracy of fault line selection.

关 键 词：故障选线 配电网 小电流接地 单相接地 锁相环 五次谐波 

分 类 号：TM771[电气工程—电力系统及自动化]