基于五次谐波法与改进型锁相环结合的配电网故障选线研究  

Research on Fault Line Selection for Distribution Networks Based on Five Times Harmonic Method and Improved Phase Locked Loop

作　　者：王建元[1] 张峥[1] 杨爽 Wang Janyuan;Zhang Zheng;Yang Shuang(Electrical Engineering College, Northeast Electric Power University, Jilin Jilin 132012;Yunnan Electric PowerCompany Limited,Qujing Electric Power Bureau,Qujing Yunnan 655000)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]云南电网有限责任公司曲靖供电局,云南曲靖655000

出　　处：《东北电力大学学报》2018年第3期1-7,共7页Journal of Northeast Electric Power University

摘　　要：随着用户侧非线性负荷的增加,系统正常运行时线路中的谐波分量增加,故障时难以精确识别故障线路的零序电流谐波分量,使得以往利用滤波器进行五次谐波分析法的精度降低.为了解决这个问题,将应用于风电并网发电的锁相环经改进后用于小电流接地系统故障选线,对故障信号进行处理,通过比较各条线路波形相位与幅值的不同来确定故障线路,获得了很好的效果.以10 kV架空线-电缆混合线路为例,建立锁相环的小信号模型,利用改进型锁相环将波形中的五次谐波进行锁定,并用名为Simulink的软件进行仿真验证,仿真结果证明了理论分析的正确性.With the increase of non-linear loads in the user side,the harmonic component of current when the system is in normal operation has increased,it is difficult to identify the fault line by the harmonic components accurately,so the precision of fifth harmonic analysis method using filters is decreased. In order to solve this problem,the phase-locked loop used in wind power integration was applied for fault line selection in small current grounding system,it obtained a very good effect in selecting the fault line by processing fault signal and comparing different lines wave phase and amplitude.Take the 10 kV power cable with transmission mixed lines for instance,the small signal model of phase locked loop was established to lock the fifth harmonic waveform.And we use Simulink to verify that the results prove the correctness of the analysis.

关 键 词：小电流接地系统 架空线-电缆混合线路 五次谐波 改进锁相环 故障选线 

分 类 号：TM862[电气工程—高电压与绝缘技术]