基于故障特征频带及形态谱的单相接地故障选线
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摘要
针对谐振接地系统中发生小故障角故障和高阻接地故障的故障选线可靠性不高的问题,利用各线路零模电流暂态分量能量和最大原理构成的特征频带,详细讨论了故障线路和健全线路在不同故障情况下的零模电流在特征频带内的相位幅值差异,避免了传统提取特征频带时无法统一各线路特征频带的不足。基于此提出了综合利用特征频带和数学形态谱的融合判据实现故障选线,利用故障零模电流进行特征频带求取,提取特征频带内电流进行形态谱运算,用形态谱表征特征频带特征。PSCAD/EMTDC及综合实验平台仿真和实测数据表明:一方面零模电流的特征频带能有效滤除信号干扰,使故障线路与健全线路零模电流的幅值和相位差异更显著;另一方面由于形态谱在多刻度下对信号形态进行分析,基于形态谱的选线方法具有较强的抗干扰能力,可靠性更高。
For the problem of low reliability of faulty line selection when small inception angle fault or high impedance fault occurs, by utilizing characteristic band formed by maximum zero mode current energy principle of each line, the amplitude and phase differences of zero mode currents of faulty line and healthy line in the characteristic frequency band are analyzed to avoid inability to unify the characteristic frequency band of each line when frequency distribution of transient currents at each line is not always the same. In this paper, a novel algorithm for faulty line selection method is proposed, combining fusion criteria of the characteristic frequency band and mathematical morphological spectrum. The algorithm uses zero mode currents to extract the characteristic frequency band, and the currents in the characteristic band are utilized for morphological spectrum operation, using morphological spectrum to characterize phase and amplitude differences of the currents in the characteristic band. A large number of data show that, on one hand, characteristic band of zero mode currents can effectively eliminate signal interference, so as to reflect differences of transient currents between faulty line and healthy line; on the other hand, because the analysis of signal morphology is performed under multi scale, morphological spectrum based line selection method has stronger anti-interference ability and higher reliability.
For the problem of low reliability of faulty line selection when small inception angle fault or high impedance fault occurs, by utilizing characteristic band formed by maximum zero mode current energy principle of each line, the amplitude and phase differences of zero mode currents of faulty line and healthy line in the characteristic frequency band are analyzed to avoid inability to unify the characteristic frequency band of each line when frequency distribution of transient currents at each line is not always the same. In this paper, a novel algorithm for faulty line selection method is proposed, combining fusion criteria of the characteristic frequency band and mathematical morphological spectrum. The algorithm uses zero mode currents to extract the characteristic frequency band, and the currents in the characteristic band are utilized for morphological spectrum operation, using morphological spectrum to characterize phase and amplitude differences of the currents in the characteristic band. A large number of data show that, on one hand, characteristic band of zero mode currents can effectively eliminate signal interference, so as to reflect differences of transient currents between faulty line and healthy line; on the other hand, because the analysis of signal morphology is performed under multi scale, morphological spectrum based line selection method has stronger anti-interference ability and higher reliability.
引文
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[14]陈筱薷,薛永端,王超,等.基于同步量测的谐振接地系统高阻接地故障区段暂态定位[J].电力系统自动化,2016,40(22):93-99.Chen Xiaolei,Xue Yongduan,Wang Chao,et al.Synchronous measurement based transient high resistance earth fault location in resonant grounding system[J].Automation of Electric Power Systems,2016,40(22):93-99(in Chinese).
[15]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.Wu Lepeng,Huang Chun,Lin Dabin,et al.Faulty line selection based on transient wavelet energy for non-solid-earthed network[J].Electric Power Automation Equipment,2013,33(5):70-75(in Chinese).
[16]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(in Chinese).
[2]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 phase-current[J].Proceedings of the CSU-EPSA,2017,29(1):30-36(in Chinese).
[3]魏向向,温渤婴.基于2阶累加生成相关性的谐振接地系统故障选线方法[J].电网技术,2017,41(5):1674-1682.Wei Xiangxiang,Wen Boying.A novel fault line detection method based on 2-order accumulated generating operation correlation analysis for resonant earthed system[J].Power System Technology,2017,41(5):1674-1682(in Chinese).
[4]郭谋发,陈静洁,张伟骏,等.基于单相级联H桥变流器的配电网故障消弧与选线新方法[J].电网技术,2015,39(9):2677-2684.Guo Moufa,Chen Jingjie,Zhang Weijun,et al.A novel approach for fault arc extinguishing and feeder selection in distribution networks based on single phase cascade H-bridge converter[J].Power System Technology,2015,39(9):2677-2684(in Chinese).
[5]赖平,周想凌,邱丹,小电流接地系统暂态电流频率特性分析及故障选线方法研究[J].电力系统保护与控制,2015,43(4):51-57.Lai Ping,Zhou Xiangling,Qiu Dan.Research on transient current frequency analysis and faulty line detecting method in indirectly grounding power system[J].Power System Protection and Control,2015,43(4):51-57(in Chinese).
[6]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 Shenxing.A method of single phase to ground fault feeder selection based on single phase current travelling wave for distribution lines[J].Proceedings of the CSEE,2014,34(34):6216-6227(in Chinese).
[7]束洪春.配电网络故障选线[M].北京:机械工业出版社,2008:122-123.
[8]束洪春.电力工程信号处理应用[M].北京:科学出版社,2011:144-154.
[9]徐佩霞,孙功宪.小波分析与应用实例[M].合肥:中国科学技术大学出版社,1996:10-20.
[10]黄南天,张卫辉,蔡国伟,等.采用改进多分辨率快速S变换的电能质量扰动识别[J].电网技术,2015,39(5):1412-1418.Huang Nantian,Zhang Weihui,Cai guowei,et al.Power quality disturbances classification with improved multiresolution fast s-transform[J].Power System Technology,2015,39(5):1412-1418(in Chinese).
[11]欧阳森,黄润鸿.基于形态边缘检测的电能质量暂态扰动定位方法[J].电网技术,2012,36(4):63-67.Ou Yangsen,Huang Runhong.A method of locating transient disturbance of power quality based on morphological edge detection[J].Power System Technology,2012,36(4):63-67(in Chinese).
[12]李天云,祝磊,王飞,等.基于数学形态谱的配电网接地选线新方法[J].电力自动化设备,2009,29(2):35-38.Li Tianyun,Zhu Lei,Wang Fei,et al.A new method of distribution network grounding line selection based on mathematical morphology spectrum[J].Electric Power Automation Equipment,2009,29(2):35-38(in Chinese).
[13]陈仕龙,曹蕊蕊,毕贵红,等.基于形态学的特高压直流输电线路单端电流方向暂态保护[J].电力自动化设备,2016,36(1):67-72.Chen Shilong,Cao Ruirui,Bi Guihong,et al.Single side current transient protection of UHVDC transmission line based on mathematical morphology spectrum[J].Electric Power Automation Equipment,2016,36(1):67-72(in Chinese).
[14]陈筱薷,薛永端,王超,等.基于同步量测的谐振接地系统高阻接地故障区段暂态定位[J].电力系统自动化,2016,40(22):93-99.Chen Xiaolei,Xue Yongduan,Wang Chao,et al.Synchronous measurement based transient high resistance earth fault location in resonant grounding system[J].Automation of Electric Power Systems,2016,40(22):93-99(in Chinese).
[15]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.Wu Lepeng,Huang Chun,Lin Dabin,et al.Faulty line selection based on transient wavelet energy for non-solid-earthed network[J].Electric Power Automation Equipment,2013,33(5):70-75(in Chinese).
[16]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(in Chinese).