基于调节脱谐度的谐振接地系统故障选线方法的研究
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摘要
针对谐振接地系统经高阻接地时,故障特征信息微弱易导致选线失败问题,提出一种调谐式故障选线方法。详细分析了故障后系统零序电流特征及所提选线方案的抗过渡电阻能力,通过调节脱谐度改变线路零序电流特征,发现故障线路与健全线路零序电流变化方向相反且变化率差异显著。利用故障线路与健全线路的零序电流变化特征差异,构建了调谐式故障选线方法。仿真计算结果表明,该方法准确可靠,高阻接地下可以有效识别故障线路,进一步提高选线准确率。
In view of failure of line selection due to weak fault characteristic information when then resonant grounding system is grounded through high resistance,a kind of tuning method in fault line selection is proposed. The zero sequence current feature of the system and anti-transition resistance ability of the propose dline selection proposal after the fault are analyzed in detail. It is found through adjusting detuning degree to change the zero-sequence current characteristics of the line that the zero sequence current variation direction for the faultand healthy line is opposite and the variation difference is obvious. The tuned fault line selection method is constructed by using the difference between the zero-sequence current variation characteristics of the fault line and the healthy line. It is shown by the simulation result that the method is accurate and reliable and,under high-resistance grounding,can identify the fault line as well as improvethe accuracy of line selection further.
In view of failure of line selection due to weak fault characteristic information when then resonant grounding system is grounded through high resistance,a kind of tuning method in fault line selection is proposed. The zero sequence current feature of the system and anti-transition resistance ability of the propose dline selection proposal after the fault are analyzed in detail. It is found through adjusting detuning degree to change the zero-sequence current characteristics of the line that the zero sequence current variation direction for the faultand healthy line is opposite and the variation difference is obvious. The tuned fault line selection method is constructed by using the difference between the zero-sequence current variation characteristics of the fault line and the healthy line. It is shown by the simulation result that the method is accurate and reliable and,under high-resistance grounding,can identify the fault line as well as improvethe accuracy of line selection further.
引文
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[9]王楠,张利,杨以涵.10 kV配电网单相接地故障交直流信号注入综合定位法[J].电网技术,2008,32(24):88-92.WANG Nan,ZHANG Li,YANG Yihan.A comprehensive location method using AC/DC signal injecting for singlephase earth fault in 10 kV distribution network[J].Power System Technology,2008,32(24):88-92.
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[11]束洪春,高利,段锐敏,等.利用零序电流全量Hough变换的配电网故障选线方法[J].电力系统自动化,2013,37(9):110-116.SHU Hongchun,GAO Li,DUAN Ruimin,et al.A novel Hough transform approach of fault line selection in distribution networks using total zero sequence current[J].Automation of Electric Power Systems,2013,37(9):110-116.
[12]王清亮,付周兴.基于能谱熵测度的自适应单相接地故障选线方法[J].电力系统自动化,2012,36(5):103-107.WANG Qingliang,FU Zhouxing.An adaptive method for single phase to ground fault line selection based on energy entropy measure[J].Automation of Electric Power Systems,2012,36(5):103-107.
[13]姜博,董新洲,施慎行.基于单相电流行波的配电线路单相接地故障选线方法[J].中国电机工程学报,2014,34(34):6216-6227.JIANG Bo,DONG Xinzhou,SHI Shenhang.A method of single phase to ground fault feeder selection based on single phase current traveling wave for distribution lines[J].Proceedings of the CSEE,2014,34(34):6216-6227.
[14]周聪聪,舒勤,韩晓言.基于线模行波突变的配电网单相接地故障测距方法[J].电网技术,2014,38(7):1973-1978.ZHOU Congcong,SHU Qin,HAN Xiaoyan.A single phase earth fault location scheme for distribution network based on mutation of line mode traveling wave[J].Power System Technology,2014,38(7):1973-1978.
[15]齐郑,郑朝,刘占波,等.S信号定位方法的有效性分析及改进研究[J].电力系统保护与控制,2012,40(8):101-104.QI Zheng,ZHENG Chao,LIU Zhanbo,et al.Effectiveness analysis and improvement of S signal fault locationmethod[J].Power System Protection and Control,2012,40(8):101-104.
[2]唐金锐,尹项根,张哲,等.配电网故障自动定位技术研究综述[J].电力自动化设备,2013,33(5):7-13.TANG Jinrui,YIN Xianggen,ZHANG Zhe,et al.Survey of fault location technology for distribution networks[J].Electric Power Automation Equipment,2013,33(5):7-13.
[3]郭清滔,吴田.小电流接地系统故障选线方法综述[J].电力系统保护与控制,2010,38(2):146-152.GUO Qingtao,WU Tian.Survey of the methods to select fault line in neutral point ineffectively grounded power system[J].Power System Protection and Control,2010,38(2):146-152.
[4]张钧,刘洪星,何正友,等.基于瞬时能量函数的故障选线新方法[J].电力系统保护与控制,2012,40(14):1-9.ZHANG Jun,LIU Hongxing,HE Zhengyou,et al.A novel fault line identification approach based on instantaneous energy function[J].Power System Protection and Control,2012,40(14):1-9.
[5]刘谋海,王媛媛,曾祥君,等.基于暂态相电流特征分析的故障选线新方法[J].电力系统及其自动化学报,2017,29(1):30-36.LIU Mouhai,WANG Yuanyuan,ZENG Xiangjun,et al.Novel method of fault line selection based on characteristic analysis of transient phasecurrent[J].Proceedings of the CSUEP-SA,2017,29(1):30-36.
[6]薛永端,徐丙垠,李天友,等.配网自动化系统小电流接地故障暂态定位技术[J].电力自动化设备,2013,33(12):27-32.XUE Yongduan,XU Bingyin,LI Tianyou,et al.Small current grounding fault location based on transient signals of distribution automation system[J].Electric Power Automation Equipment,2013,33(12):27-32.
[7]束洪春,朱梦梦,黄文珍,等.基于暂态零序电流时频特征量的配网故障选线方法[J].电力自动化设备,2013,33(9):1-6.SHU Hongchun,ZHU Mengmeng,HUANG Wenzhen,et al.Faulty line selection based on time frequency characteristics of transient zero sequence current[J].Electric Power Automation Equipment,2013,33(9):1-6.
[8]李雅洁,孟晓丽,宋晓辉,等.基于最优FIR滤波器与层次聚类的配电网单相接地故障选线方法[J].电网技术,2015,39(1):143-149.LI Yajie,MENG Xiaoli,SONG Xiaohui,et al.Singlephasetoground fault line detection for distribution network based on optimal finite impulse response filter and hierarchical clustering[J].Power System Technology,2015,39(1):143-149.
[9]王楠,张利,杨以涵.10 kV配电网单相接地故障交直流信号注入综合定位法[J].电网技术,2008,32(24):88-92.WANG Nan,ZHANG Li,YANG Yihan.A comprehensive location method using AC/DC signal injecting for singlephase earth fault in 10 kV distribution network[J].Power System Technology,2008,32(24):88-92.
[10]ALEXEY I,SHALIN,EVGENY N.Ground fault protection for 6~10 kV distribution system[C]//2002 Siberian Russian Workshop on Electron Devices and Materials(EDM 2002),2002:96-98.
[11]束洪春,高利,段锐敏,等.利用零序电流全量Hough变换的配电网故障选线方法[J].电力系统自动化,2013,37(9):110-116.SHU Hongchun,GAO Li,DUAN Ruimin,et al.A novel Hough transform approach of fault line selection in distribution networks using total zero sequence current[J].Automation of Electric Power Systems,2013,37(9):110-116.
[12]王清亮,付周兴.基于能谱熵测度的自适应单相接地故障选线方法[J].电力系统自动化,2012,36(5):103-107.WANG Qingliang,FU Zhouxing.An adaptive method for single phase to ground fault line selection based on energy entropy measure[J].Automation of Electric Power Systems,2012,36(5):103-107.
[13]姜博,董新洲,施慎行.基于单相电流行波的配电线路单相接地故障选线方法[J].中国电机工程学报,2014,34(34):6216-6227.JIANG Bo,DONG Xinzhou,SHI Shenhang.A method of single phase to ground fault feeder selection based on single phase current traveling wave for distribution lines[J].Proceedings of the CSEE,2014,34(34):6216-6227.
[14]周聪聪,舒勤,韩晓言.基于线模行波突变的配电网单相接地故障测距方法[J].电网技术,2014,38(7):1973-1978.ZHOU Congcong,SHU Qin,HAN Xiaoyan.A single phase earth fault location scheme for distribution network based on mutation of line mode traveling wave[J].Power System Technology,2014,38(7):1973-1978.
[15]齐郑,郑朝,刘占波,等.S信号定位方法的有效性分析及改进研究[J].电力系统保护与控制,2012,40(8):101-104.QI Zheng,ZHENG Chao,LIU Zhanbo,et al.Effectiveness analysis and improvement of S signal fault locationmethod[J].Power System Protection and Control,2012,40(8):101-104.