采用形态学峰谷检测的谐振接地系统故障选线方法
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摘要
谐振接地系统发生单相接地故障时暂态量十分丰富。文中对各线路发生故障后1/4周期零序电流的短窗数据进行小波变换,剔除工频所在频带,按能量和最大的原则选取特征频带,并对特征频带下重构的小波系数进行形态学峰谷检测。故障线路零序电流首波头峰谷形态与各线路零序电流首波头整体的峰谷形态相反,据此构成故障选线判据。仿真分析和实录数据验证均表明所提方法选线准确、可靠性高。
Transient electrical quantity information is very abundant when single-phase grounding fault occurs in resonant earthed system.The short window data of 1/4 period of zero sequence current fault of each line are transformed by wavelet transform.The frequency band of power frequency is eliminated and the feature frequency band is selected according to the principle of maximum energy sum.The reconstructed wavelet coefficients under the feature frequency band are checked by morphological peak-valley detection.The peak-valley characteristic of the fault feeder is opposite to that of the total feeders,which is used as the fault line selection criterion.The simulation analysis and practical verification demonstrate the feasibility and effectivity of this method.
Transient electrical quantity information is very abundant when single-phase grounding fault occurs in resonant earthed system.The short window data of 1/4 period of zero sequence current fault of each line are transformed by wavelet transform.The frequency band of power frequency is eliminated and the feature frequency band is selected according to the principle of maximum energy sum.The reconstructed wavelet coefficients under the feature frequency band are checked by morphological peak-valley detection.The peak-valley characteristic of the fault feeder is opposite to that of the total feeders,which is used as the fault line selection criterion.The simulation analysis and practical verification demonstrate the feasibility and effectivity of this method.
引文
[1]薛永端,冯祖仁,徐丙垠,等.基于暂态零序电流比较的小电流接地选线研究[J].电力系统自动化,2003,27(9):48-53.XUE Yongduan,FENG Zuren,XU Bingyin,et al.Earth fault protection in non-solidly earthed network based on transient zero sequence current comparison[J].Automation of Electric Power Systems,2003,27(9):48-53.
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[3]TANG J R,YIN X G,WEN M H,et al.Fault location in neutral non-effectively grounded distribution systems using phase current and line-to-line voltage[J].Electric Power Components and Systems,2014,42(13):1371-1385.
[4]刘健,张小庆,申巍,等.中性点非有效接地配电网的单相接地定位能力测试技术[J].电力系统自动化,2018,42(1):138-143.DOI:10.7500/AEPS20170508012.LIU Jian,ZHANG Xiaoqing,SHEN Wei,et al.Performance testing of single phase to earth fault location for distribution network with neutral point non-effectively grounded systems[J].Automation of Electric Power Systems,2018,42(1):138-143.DOI:10.7500/AEPS20170508012.
[5]汤涛,黄纯,江亚群,等.基于高低频段暂态信号相关分析的谐振接地故障选线方法[J].电力系统自动化,2016,40(16):105-111.DOI:10.7500/AEPS20151125013.TANG Tao,HUANG Chun,JIANG Yaqun,et al.Fault line selection method in resonant earthed system based on transient signal correlation analysis under high and low frequencies[J].Automation of Electric Power Systems,2016,40(16):105-111.DOI:10.7500/AEPS20151125013.
[6]曲轶龙,谭伟璞,杨以涵.基于形态滤波的谐振接地系统故障选线新方法[J].电力系统自动化,2008,32(12):73-77.QU Yilong,TAN Weipu,YANG Yihan.A new transient method for earth fault line selection in resonant grounded power system based on morphological filtering[J].Automation of Electric Power Systems,2008,32(12):73-77.
[7]张艳霞,王清亮.应用故障暂态特性实现配电网故障选线的新方法[J].电力系统自动化,2009,33(16):76-80.ZHANG Yanxia,WANG Qingliang.New method for single phase to ground fault feeder selection based on analysis of fault transient characteristics[J].Automation of Electric Power Systems,2009,33(16):76-80.
[8]周登登,刘志刚,胡非,等.基于小波去噪和暂态能量分组比较的小电流选线接地新方法[J].电力系统保护与控制,2010,38(7):22-28.ZHOU Dengdeng,LIU Zhigang,HU Fei,et al.A new method for fault line selection based on wavelet de-noising and transient current energy grouping comparison in ineffective grounding system[J].Power System Protection and Control,2010,38(7):22-28.
[9]束洪春,彭仕欣.配网缆-线混合线路故障选线相对能量法[J].电力自动化设备,2009,29(11):1-5.SHU Hongchun,PENG Shixin.Faulty line detection by relative energy method for hybrid transmission lines[J].Electric Power Automation Equipment,2009,29(11):1-5.
[10]张钧,何正友,贾勇.基于S变换的故障选线新方法[J].中国电机工程学报,2011,31(10):109-155.ZHANG Jun,HE Zhengyou,JIA Yong.Fault line identification approach based on S-transform[J].Proceedings of the CSEE,2011,31(10):109-155.
[11]董新洲,毕见广.配电线路暂态行波的分析和接地选线研究[J].中国电机工程学报,2005,25(4):3-8.DONG Xinzhou,BI Jianguang.Analysis on transient traveling wave and study on fault line selection for distribution lines[J].Proceedings of the CSEE,2005,25(4):3-8.
[12]黄景光,刘会家,胡汉梅,等.行波小波系数极大值极性法接地故障选线研究[J].高电压技术,2006,32(8):100-104.HUANG Jingguang,LIU Huijia,HU Hanmei,et al.Distribution grid earth fault line detection study by traveling wave wavelets coefficient maxim um polarities[J].High Voltage Engineering,2006,32(8):100-104.
[13]刘渝根,王建南,马晋佩,等.结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法[J].高电压技术,2015,41(5):1519-1525.LIU Yugen,WANG Jiannan,MA Jinpei,et al.Comprehensive fault line selection method for resonant grounded system combining wavelet packet transform with fifth harmonic method[J].High Voltage Engineering,2015,41(5):1519-1525.
[14]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009.YAO Huannian,CAO Meiyue.Resonant grounding in power system[M].Beijing:China Electric Power Press,2009.
[15]唐金锐,杨晨,程利军.配电网馈线零序电流随过补偿度动态调节的变化特性分析[J].电力系统自动化,2017,41(13):125-132.DOI:10.7500/AEPS20161114004.TANG Jinrui,YANG Chen,CHENG Lijun.Analysis on zerosequence current variation characteristic for feeders of distribution network at different residual current compensation factors[J].Automation of Electric Power Systems,2017,41(13):125-132.DOI:10.7500/AEPS20161114004.
[16]张林利,徐丙垠,薛永端,等.基于线电压和零模电流的小电流接地故障暂态定位方法[J].中国电机工程学报,2012,32(13):110-115.ZHANG Linli,XU Bingyin,XUE Yongduan,et al.Transient fault locating method based on line voltage and zero-mode current in non-solidly earthed network[J].Proceedings of the CSEE,2012,32(13):110-115.
[17]束洪春,刘娟,司大军,等.自适应消弧线圈接地系统故障选线实用新方法[J].电力系统自动化,2005,29(13):64-68.SHU Hongchun,LIU Juan,SI Dajun,et al.New adaptive method for fault line selection in non-solidly grounded system[J].Automation of Electric Power Systems,2005,29(13):64-68.
[2]束洪春,段锐敏,朱梦梦,等.基于零序电流小波变换系数均方根值的故障选线ANN方法[J].电力科学与技术学报,2013,28(1):17-24.SHU Hongchun,DUAN Ruimin,ZHU Mengmeng,et al.An ANN method of faulted feeder detection based on continuous wavelet transform coefficients’RMS values of zero sequence current[J].Journal of Electric Power Science and Technology,2013,28(1):17-24.
[3]TANG J R,YIN X G,WEN M H,et al.Fault location in neutral non-effectively grounded distribution systems using phase current and line-to-line voltage[J].Electric Power Components and Systems,2014,42(13):1371-1385.
[4]刘健,张小庆,申巍,等.中性点非有效接地配电网的单相接地定位能力测试技术[J].电力系统自动化,2018,42(1):138-143.DOI:10.7500/AEPS20170508012.LIU Jian,ZHANG Xiaoqing,SHEN Wei,et al.Performance testing of single phase to earth fault location for distribution network with neutral point non-effectively grounded systems[J].Automation of Electric Power Systems,2018,42(1):138-143.DOI:10.7500/AEPS20170508012.
[5]汤涛,黄纯,江亚群,等.基于高低频段暂态信号相关分析的谐振接地故障选线方法[J].电力系统自动化,2016,40(16):105-111.DOI:10.7500/AEPS20151125013.TANG Tao,HUANG Chun,JIANG Yaqun,et al.Fault line selection method in resonant earthed system based on transient signal correlation analysis under high and low frequencies[J].Automation of Electric Power Systems,2016,40(16):105-111.DOI:10.7500/AEPS20151125013.
[6]曲轶龙,谭伟璞,杨以涵.基于形态滤波的谐振接地系统故障选线新方法[J].电力系统自动化,2008,32(12):73-77.QU Yilong,TAN Weipu,YANG Yihan.A new transient method for earth fault line selection in resonant grounded power system based on morphological filtering[J].Automation of Electric Power Systems,2008,32(12):73-77.
[7]张艳霞,王清亮.应用故障暂态特性实现配电网故障选线的新方法[J].电力系统自动化,2009,33(16):76-80.ZHANG Yanxia,WANG Qingliang.New method for single phase to ground fault feeder selection based on analysis of fault transient characteristics[J].Automation of Electric Power Systems,2009,33(16):76-80.
[8]周登登,刘志刚,胡非,等.基于小波去噪和暂态能量分组比较的小电流选线接地新方法[J].电力系统保护与控制,2010,38(7):22-28.ZHOU Dengdeng,LIU Zhigang,HU Fei,et al.A new method for fault line selection based on wavelet de-noising and transient current energy grouping comparison in ineffective grounding system[J].Power System Protection and Control,2010,38(7):22-28.
[9]束洪春,彭仕欣.配网缆-线混合线路故障选线相对能量法[J].电力自动化设备,2009,29(11):1-5.SHU Hongchun,PENG Shixin.Faulty line detection by relative energy method for hybrid transmission lines[J].Electric Power Automation Equipment,2009,29(11):1-5.
[10]张钧,何正友,贾勇.基于S变换的故障选线新方法[J].中国电机工程学报,2011,31(10):109-155.ZHANG Jun,HE Zhengyou,JIA Yong.Fault line identification approach based on S-transform[J].Proceedings of the CSEE,2011,31(10):109-155.
[11]董新洲,毕见广.配电线路暂态行波的分析和接地选线研究[J].中国电机工程学报,2005,25(4):3-8.DONG Xinzhou,BI Jianguang.Analysis on transient traveling wave and study on fault line selection for distribution lines[J].Proceedings of the CSEE,2005,25(4):3-8.
[12]黄景光,刘会家,胡汉梅,等.行波小波系数极大值极性法接地故障选线研究[J].高电压技术,2006,32(8):100-104.HUANG Jingguang,LIU Huijia,HU Hanmei,et al.Distribution grid earth fault line detection study by traveling wave wavelets coefficient maxim um polarities[J].High Voltage Engineering,2006,32(8):100-104.
[13]刘渝根,王建南,马晋佩,等.结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法[J].高电压技术,2015,41(5):1519-1525.LIU Yugen,WANG Jiannan,MA Jinpei,et al.Comprehensive fault line selection method for resonant grounded system combining wavelet packet transform with fifth harmonic method[J].High Voltage Engineering,2015,41(5):1519-1525.
[14]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009.YAO Huannian,CAO Meiyue.Resonant grounding in power system[M].Beijing:China Electric Power Press,2009.
[15]唐金锐,杨晨,程利军.配电网馈线零序电流随过补偿度动态调节的变化特性分析[J].电力系统自动化,2017,41(13):125-132.DOI:10.7500/AEPS20161114004.TANG Jinrui,YANG Chen,CHENG Lijun.Analysis on zerosequence current variation characteristic for feeders of distribution network at different residual current compensation factors[J].Automation of Electric Power Systems,2017,41(13):125-132.DOI:10.7500/AEPS20161114004.
[16]张林利,徐丙垠,薛永端,等.基于线电压和零模电流的小电流接地故障暂态定位方法[J].中国电机工程学报,2012,32(13):110-115.ZHANG Linli,XU Bingyin,XUE Yongduan,et al.Transient fault locating method based on line voltage and zero-mode current in non-solidly earthed network[J].Proceedings of the CSEE,2012,32(13):110-115.
[17]束洪春,刘娟,司大军,等.自适应消弧线圈接地系统故障选线实用新方法[J].电力系统自动化,2005,29(13):64-68.SHU Hongchun,LIU Juan,SI Dajun,et al.New adaptive method for fault line selection in non-solidly grounded system[J].Automation of Electric Power Systems,2005,29(13):64-68.