基于交叉重叠差分变换关联性分析的配电网故障选线
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摘要
线缆混合线路的谐振接地系统的自由振荡频率一般在300～3 000Hz之间,且故障初期,配电网暂态信息丰富,交叉重叠差分(SOD)变换能反映零序电流的暂态特征,因而提出基于SOD变换关联性分析的单相接地故障选线方法。结合零序电压梯度和作为选线的启动,提高了选线的灵敏性及快速性。通过小波变换提取出暂态零序电流0～2.5kHz频带的信息,并对其作SOD变换。经SOD变换后,增大了健全线路之间的相似性以及健全线路与故障线路之间的差异,故对SOD变换的结果进行关联性分析。通过关联性分析形成故障线路判别矩阵,若故障线路判别矩阵中全为"1"则为母线故障,否则判别矩阵中"-1"所对应的线路即为故障馈线。仿真表明,该方法有效性几乎不受故障的初始角度、过渡电阻和故障位置的影响,选线结果准确、可靠。
In a resonant grounding system,the free-oscillation frequency of the cable-overhead line is typically between 300 and3 000 Hz.In the initial stage of the fault,the transient information of the distribution network is rich,and the sequential overlapping derivative(SOD)transform can reflect the transient characteristic of the zero-sequence current.Therefore,the single-phase-to-ground fault line selection method based on SOD transform correlation analysis is proposed.And combined with the zero-sequence voltage gradient summation as the starting criterion,the sensitivity and rapidity of the fault line selection are improved.The information of the transient zero-sequence current in the 0～2.5 kHz band is extracted by wavelet transform and SOD transform is conducted.After the SOD transform,the similarity between the healthy lines is improved and the difference between the fault line and healthy lines is increased.Therefore,the correlation analysis of the results of the SOD transform is performed to form a fault line discrimination matrix.If the fault line discriminant matrix is all"1",it is judged that the bus is faulty,otherwise,the line corresponding to"-1"is the fault line.The simulation shows that the method is almost independent of the initial phase angle,transition resistance and fault location,and the line selection result is accurate and reliable.
In a resonant grounding system,the free-oscillation frequency of the cable-overhead line is typically between 300 and3 000 Hz.In the initial stage of the fault,the transient information of the distribution network is rich,and the sequential overlapping derivative(SOD)transform can reflect the transient characteristic of the zero-sequence current.Therefore,the single-phase-to-ground fault line selection method based on SOD transform correlation analysis is proposed.And combined with the zero-sequence voltage gradient summation as the starting criterion,the sensitivity and rapidity of the fault line selection are improved.The information of the transient zero-sequence current in the 0～2.5 kHz band is extracted by wavelet transform and SOD transform is conducted.After the SOD transform,the similarity between the healthy lines is improved and the difference between the fault line and healthy lines is increased.Therefore,the correlation analysis of the results of the SOD transform is performed to form a fault line discrimination matrix.If the fault line discriminant matrix is all"1",it is judged that the bus is faulty,otherwise,the line corresponding to"-1"is the fault line.The simulation shows that the method is almost independent of the initial phase angle,transition resistance and fault location,and the line selection result is accurate and reliable.
引文
[1]郝玉山,高曙,杨以涵,等.MLN系列小电流接地微机选线装置动作原理[J].电力情报,1994,2(2):7-11.HAO Yushan,GAO Shu,YANG Yihan,et al.The principle of MLN series devices for detecting earth fault line in neutral ungrounded power system[J].Information on Electric Power,1994,2(2):7-11.
[2]唐轶,陈奎,陈庆,等.馈出线测量导纳互差求和法小电流接地选线研究[J].电力系统自动化,2005,29(11):69-73.TANG Yi,CHEN Kui,CHEN Qing,et al.Study on the earthed fault detection method in indirectly earthed power system using summation of outgoing feeder measurement admittance mutual difference[J].Automation of Electric Power Systems,2005,29(11):69-73.
[3]唐轶,陈奎,陈庆,等.导纳互差之绝对值和的极大值法小电流接地选线研究[J].中国电机工程学报,2005,25(6):49-54.TANG Yi,CHEN Kui,CHEN Qing,et al.Study on earthed fault location method in indirectly grounding power system using maximum value of absolute value summation of measurement admittance mutual difference[J].Proceedings of the CSEE,2005,25(6):49-54.
[4]曾祥君,尹项根,张哲,等.零序导纳法馈线接地保护的研究[J].中国电机工程学报,2001,21(4):5-10.ZENG Xiangjun,YIN Xianggen,ZHANG Zhe,et al.Study on feeder grounding fault protection based on zero sequence admittance[J].Proceedings of the CSEE,2001,21(4):5-10.
[5]束洪春.谐振接地系统虚幻接地的辨识和综合选线方法[J].电力自动化设备,2016,36(6):122-129.SHU Hongchun.Unreal grounding identification and comprehensive line selection for resonant grounding system[J].Electric Power Automation Equipment,2016,36(6):122-129.
[6]束洪春.配网选线保护与故障定位[M].北京:科学出版社,2016:28-30.SHU Hongchun.Line selection protection and fault location of distribution network[M].Beijing:Science Press,2016:28-30.
[7]齐郑,庄舒仪,刘自发,等.基于并联电阻扰动信号的配电网故障定位方法分析[J].电力系统自动化,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.QI Zheng,ZHUANG Shuyi,LIU Zifa,et al.Analysis on distribution network fault location method based on parallel resistance disturbed signal injection[J].Automation of Electric Power Systems,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.
[8]樊淑娴,徐丙垠,张清周.注入方波信号的经消弧线圈接地系统故障选线方法[J].电力系统自动化,2012,36(4):91-95.FAN Shuxian,XU Bingyin,ZHANG Qingzhou.A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection[J].Automation of Electric Power Systems,2012,36(4):91-95.
[9]王凤,康怡.基于脉冲信号注入法的小电流接地选线技术[J].电网技术,2008,32(15):90-93.WANG Feng,KANG Yi.Pulse single injection based faulty line detection for small current neutral grounding system[J].Power System Technology,2008,32(15):90-93.
[10]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.
[11]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.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.
[12]刘谋海,方涛,姜运,等.基于暂态主频分量相关性分析的故障选线方法[J].电力系统保护与控制,2016,44(2):74-79.LIU Mouhai,FANG Tao,JIANG Yun,et al.A new correlation analysis approach to fault line selection based on transient main-frequency components[J].Power System Protection and Control,2016,44(2):74-79.
[13]李振兴,吴李群,田斌,等.采用区域电网多点测量信息的行波故障定位[J].电力系统自动化,2017,41(8):146-152.DOI:10.7500/AEPS20160414009.LI Zhenxing,WU Liqun,TIAN Bin,et al.Traveling wave fault location using multi-point measurement information of regional power grid[J].Automation of Electric Power Systems,2017,41(8):146-152.DOI:10.7500/AEPS20160414009.
[14]梁睿,崔连华,都志立,等.基于广域行波初始波头时差关系矩阵的配电网故障选线及测距[J].高电压技术,2014,40(11):3411-3417.LIANG Rui,CUI Lianhua,DU Zhili,et al.Fault line selection and location in distribution power network based on traveling wave time difference of arrival relationships[J].High Voltage Engineering,2014,40(11):3411-3417.
[15]束洪春,彭仕欣.利用全频带综合小波能量相对熵的配网故障选线方法[J].高电压技术,2009,35(7):1559-1564.SHU Hongchun,PENG Shixin.Distribution network fault line detection using the full waveband complex relative entropy of wavelet energy[J].High Voltage Engineering,2009,35(7):1559-1564.
[16]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-solidearthed network[J].Electric Power Automation Equipment,2013,33(5):70-75.
[17]李玲玲,李凤强,王成山.基于模糊综合决策的配电网单相接地故障选线[J].电力系统及其自动化学报,2011,23(5):43-46.LI Lingling,LI Fengqiang,WANG Chengshan.Selecting line based on fuzzy fusion decision-making in single-phase-to-earth fault of distribution network[J].Proceedings of the CSU-EPSA,2011,23(5):43-46.
[18]潘本仁,管廷龙,桂小智,等.不接地系统高阻接地故障特征及选线适用性分析[J].电力系统及其自动化学报,2017,29(10):52-59.PAN Benren,GUAN Tinglong,GUI Xiaozhi,et al.Characteristics of high-resistance grounding fault in isolated neutral systems and the adaptability analysis of fault line selection[J].Proceedings of the CSU-EPSA,2017,29(10):52-59.
[19]薛永端,李娟,陈筱薷,等.谐振接地系统高阻接地故障暂态选线与过渡电阻辨识[J].中国电机工程学报,2017,37(17):5037-5048.XUE Yongduan,LI Juan,CHEN Xiaoru,et al.Faulty feeder selection and transition resistance identification of high impedance fault in a resonant grounding system using transient signals[J].Proceedings of the CSEE,2017,37(17):5037-5048.
[20]杨帆,金鑫,沈煜,等.小电流接地故障多层次分类及其识别模型[J].电力系统自动化,2018,42(15):186-191.DOI:10.7500/AEPS20171227009.YANG Fan,JIN Xin,SHEN Yu,et al.Multilevel classification and identification model for earth faults in nonsolidly earthed network[J].Automation of Electric Power Systems,2018,42(15):186-191.DOI:10.7500/AEPS20171227009.
[21]要焕年,曹梅月.电力系统谐振接地[M].2版.北京:中国电力出版社,2009:64-70.YAO Huannian,CAO Meiyue.Power system resonance grounding[M].2nd ed.Beijing:China Electric Power Press,2009:64-70.
[22]HAFEZ D M,ELDIN E H S,ALAZIZ A A M A.A novel unit protective relaying concept based on current signal sequential overlapping derivative transform:two sides fed transmission line application[J].Ain Shams Engineering Journal,2012,3(3):267-277.
[23]何正友,钱清泉.电力系统暂态信号分析中小波基的选择原则[J].电力系统自动化,2003,27(10):45-48.HE Zhengyou,QIAN Qingquan.Mother wavelet option method in the transient signal analysis of electric power systems[J].Automation of Electric Power Systems,2003,27(10):45-48.
[2]唐轶,陈奎,陈庆,等.馈出线测量导纳互差求和法小电流接地选线研究[J].电力系统自动化,2005,29(11):69-73.TANG Yi,CHEN Kui,CHEN Qing,et al.Study on the earthed fault detection method in indirectly earthed power system using summation of outgoing feeder measurement admittance mutual difference[J].Automation of Electric Power Systems,2005,29(11):69-73.
[3]唐轶,陈奎,陈庆,等.导纳互差之绝对值和的极大值法小电流接地选线研究[J].中国电机工程学报,2005,25(6):49-54.TANG Yi,CHEN Kui,CHEN Qing,et al.Study on earthed fault location method in indirectly grounding power system using maximum value of absolute value summation of measurement admittance mutual difference[J].Proceedings of the CSEE,2005,25(6):49-54.
[4]曾祥君,尹项根,张哲,等.零序导纳法馈线接地保护的研究[J].中国电机工程学报,2001,21(4):5-10.ZENG Xiangjun,YIN Xianggen,ZHANG Zhe,et al.Study on feeder grounding fault protection based on zero sequence admittance[J].Proceedings of the CSEE,2001,21(4):5-10.
[5]束洪春.谐振接地系统虚幻接地的辨识和综合选线方法[J].电力自动化设备,2016,36(6):122-129.SHU Hongchun.Unreal grounding identification and comprehensive line selection for resonant grounding system[J].Electric Power Automation Equipment,2016,36(6):122-129.
[6]束洪春.配网选线保护与故障定位[M].北京:科学出版社,2016:28-30.SHU Hongchun.Line selection protection and fault location of distribution network[M].Beijing:Science Press,2016:28-30.
[7]齐郑,庄舒仪,刘自发,等.基于并联电阻扰动信号的配电网故障定位方法分析[J].电力系统自动化,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.QI Zheng,ZHUANG Shuyi,LIU Zifa,et al.Analysis on distribution network fault location method based on parallel resistance disturbed signal injection[J].Automation of Electric Power Systems,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.
[8]樊淑娴,徐丙垠,张清周.注入方波信号的经消弧线圈接地系统故障选线方法[J].电力系统自动化,2012,36(4):91-95.FAN Shuxian,XU Bingyin,ZHANG Qingzhou.A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection[J].Automation of Electric Power Systems,2012,36(4):91-95.
[9]王凤,康怡.基于脉冲信号注入法的小电流接地选线技术[J].电网技术,2008,32(15):90-93.WANG Feng,KANG Yi.Pulse single injection based faulty line detection for small current neutral grounding system[J].Power System Technology,2008,32(15):90-93.
[10]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.
[11]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.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.
[12]刘谋海,方涛,姜运,等.基于暂态主频分量相关性分析的故障选线方法[J].电力系统保护与控制,2016,44(2):74-79.LIU Mouhai,FANG Tao,JIANG Yun,et al.A new correlation analysis approach to fault line selection based on transient main-frequency components[J].Power System Protection and Control,2016,44(2):74-79.
[13]李振兴,吴李群,田斌,等.采用区域电网多点测量信息的行波故障定位[J].电力系统自动化,2017,41(8):146-152.DOI:10.7500/AEPS20160414009.LI Zhenxing,WU Liqun,TIAN Bin,et al.Traveling wave fault location using multi-point measurement information of regional power grid[J].Automation of Electric Power Systems,2017,41(8):146-152.DOI:10.7500/AEPS20160414009.
[14]梁睿,崔连华,都志立,等.基于广域行波初始波头时差关系矩阵的配电网故障选线及测距[J].高电压技术,2014,40(11):3411-3417.LIANG Rui,CUI Lianhua,DU Zhili,et al.Fault line selection and location in distribution power network based on traveling wave time difference of arrival relationships[J].High Voltage Engineering,2014,40(11):3411-3417.
[15]束洪春,彭仕欣.利用全频带综合小波能量相对熵的配网故障选线方法[J].高电压技术,2009,35(7):1559-1564.SHU Hongchun,PENG Shixin.Distribution network fault line detection using the full waveband complex relative entropy of wavelet energy[J].High Voltage Engineering,2009,35(7):1559-1564.
[16]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-solidearthed network[J].Electric Power Automation Equipment,2013,33(5):70-75.
[17]李玲玲,李凤强,王成山.基于模糊综合决策的配电网单相接地故障选线[J].电力系统及其自动化学报,2011,23(5):43-46.LI Lingling,LI Fengqiang,WANG Chengshan.Selecting line based on fuzzy fusion decision-making in single-phase-to-earth fault of distribution network[J].Proceedings of the CSU-EPSA,2011,23(5):43-46.
[18]潘本仁,管廷龙,桂小智,等.不接地系统高阻接地故障特征及选线适用性分析[J].电力系统及其自动化学报,2017,29(10):52-59.PAN Benren,GUAN Tinglong,GUI Xiaozhi,et al.Characteristics of high-resistance grounding fault in isolated neutral systems and the adaptability analysis of fault line selection[J].Proceedings of the CSU-EPSA,2017,29(10):52-59.
[19]薛永端,李娟,陈筱薷,等.谐振接地系统高阻接地故障暂态选线与过渡电阻辨识[J].中国电机工程学报,2017,37(17):5037-5048.XUE Yongduan,LI Juan,CHEN Xiaoru,et al.Faulty feeder selection and transition resistance identification of high impedance fault in a resonant grounding system using transient signals[J].Proceedings of the CSEE,2017,37(17):5037-5048.
[20]杨帆,金鑫,沈煜,等.小电流接地故障多层次分类及其识别模型[J].电力系统自动化,2018,42(15):186-191.DOI:10.7500/AEPS20171227009.YANG Fan,JIN Xin,SHEN Yu,et al.Multilevel classification and identification model for earth faults in nonsolidly earthed network[J].Automation of Electric Power Systems,2018,42(15):186-191.DOI:10.7500/AEPS20171227009.
[21]要焕年,曹梅月.电力系统谐振接地[M].2版.北京:中国电力出版社,2009:64-70.YAO Huannian,CAO Meiyue.Power system resonance grounding[M].2nd ed.Beijing:China Electric Power Press,2009:64-70.
[22]HAFEZ D M,ELDIN E H S,ALAZIZ A A M A.A novel unit protective relaying concept based on current signal sequential overlapping derivative transform:two sides fed transmission line application[J].Ain Shams Engineering Journal,2012,3(3):267-277.
[23]何正友,钱清泉.电力系统暂态信号分析中小波基的选择原则[J].电力系统自动化,2003,27(10):45-48.HE Zhengyou,QIAN Qingquan.Mother wavelet option method in the transient signal analysis of electric power systems[J].Automation of Electric Power Systems,2003,27(10):45-48.