复杂配电网系统单相接地故障选线算法
|
摘要
为实现含有多条馈线及电缆与架空线并存的复杂系统的单相接地故障准确选线,使用PSCAD对复杂系统进行建模,并对各线路的单相接地故障进行仿真模拟,应用MATLAB中的小波工具箱,对仿真数据进行处理。首先,通过使用小波分解得到模极大值,来确定故障发生时刻。然后,利用小波包分解系数来判断故障线路零序电流与故障线路的极性关系,进行故障选线。最后,使用故障测度作为选线判据,取故障测度最大值对应的线路为故障线路。大量实验证明,故障选线过程正确可靠,抗干扰能力强。
In order to achieve accurate single-phase ground faults for the complex system with multiple feeders and cables co-existing with overhead lines,we model it with PSCAD and run diverse simulations of single-phase ground faults on each line. The simulation data was analyzed by wavelet toolbox in MATLAB. Firstly,the modulus maxima are obtained through the wavelet decomposition to determine the beginning of fault. Then,the wavelet packet decomposition coefficient is used to determine the polarity relationship of the zero-sequence current between the non-faulted line and the fault lines. Finally,the fault measure is used as the selection criterion,and the line corresponding to the maximum value of the fault measure is the fault line. After a large number of experiments,it can be concluded that the fault line selection process is correct and reliable,and it has strong anti-interference ability.
In order to achieve accurate single-phase ground faults for the complex system with multiple feeders and cables co-existing with overhead lines,we model it with PSCAD and run diverse simulations of single-phase ground faults on each line. The simulation data was analyzed by wavelet toolbox in MATLAB. Firstly,the modulus maxima are obtained through the wavelet decomposition to determine the beginning of fault. Then,the wavelet packet decomposition coefficient is used to determine the polarity relationship of the zero-sequence current between the non-faulted line and the fault lines. Finally,the fault measure is used as the selection criterion,and the line corresponding to the maximum value of the fault measure is the fault line. After a large number of experiments,it can be concluded that the fault line selection process is correct and reliable,and it has strong anti-interference ability.
引文
[1]毛鹏,孙雅明,张兆宁,等.小波包在配电网单相接地故障选线中的应用[J].电网技术,2000,24(6):9-13.Mao Peng,Sun Yaming,Zhang Zhaoning,et al.Wavelets packet based detection of phase-to-ground fault in distribution automation system[J].Power System Technology,2000,24(6):9-13.
[2]贾清泉,刘连光,杨以涵,等.应用小波检测故障突变特性实现配电网小电流故障选线保护[J].中国电机工程学报,2001,21(10):78-82.Jia Qingquan,Liu Liangguang,Yang Yihan,et al.Abrupt change detection with wavelet for small current fault relaying[J].Proceedings of the CSEE,2001,21(10):78-82.
[3]贾清泉,肖鹏,杨以涵,等.小电流接地电网单相接地故障的小波选线方法[J].继电器,2001,29(3):5-8.Jia Qingquan,Xiao Peng,Yang Yihan,et al.Wavelets method to select single phase faulted circuit for small current grounding power systems[J].Relay,2001,29(3):5-8.
[4]齐郑,陈炯聪,杨奇逊.基于小波变换和LMS自适应滤波器的单相接地选线方法[J].电力系统自动化,2004,28(9):58-61.Qi Zheng,Chen Jiongcong,Yang Qixun.Selection of single-phase to ground fault line based on wavelet transform and LMS adaptive filter[J].Automation of Electric Power Systems,2004,28(9):58-61.
[5]肖白,束洪春,穆钢,等.基于模极大值理论的配电网接地保护研究[J].继电器,2004,32(10):36-39.Xiao Bai,Shu Hongchun,Mu Gang,et al.Study of grounding fault protection in distribution system based on the theory of modular maxima[J].Relay,2004,32(10):36-39.
[6]肖白,杜世君,周晓岩.一种基于小波变换的小接地电流系统单相接地故障选线方法[J].东北电力学院学报,2003,23(1):72-75.Xiao Bai,Du Shijun,Zhou Xiaoyan.A method of single-phase earthfault protection in distribution system based on wavelet transform[J].Northeast Electric Power College Journal,2003,23(1):72-75.
[7]戴剑锋,张艳霞.基于多频带分析的自适应配电网故障选线研究[J].中国电机工程学报,2003,23(5):44-47.Dai Jianfeng,Zhang Yanxia.Study on adaptively choosing fault line under single-phase to ground fault based on analysis of multi-frequency bands[J].Proceedings of the CSEE,2003,23(5):44-47.
[8]王耀南,霍百林,王辉,等.基于小波包的小电流接地系统故障选线的新判据[J].中国电机工程学报,2004,24(6):54-58.Wang Yaonan,Huo Bailin,Wang Hui,et al.A new criterion for earth fault line selection based on wavelet packets in small current neutral grounding system[J].Proceedings of the CSEE,2004,24(6):54-58.
[9]王军芬,康怡,韩钧,等.基于小波包的配电网单相接地故障判别[J].继电器,2005,33(24):10-15.Wang Junfen,Kang Yi,Han Jun,et al.Selection on single phase to ground fault line based on wavelet packets[J].Relay,2005,33(24):10-15.
[10]龚静.利用小波包分解系数实现配电网单相接地故障选线[J].电力系统保护与控制,2009,37(24):94-99.Gong Jing.Using wavelet packet decomposing coefficient to achieve distribution network single-phase ground fault line selection[J].Power System Protection and Control,2009,37(24):94-99.
[11]马士聪,徐丙垠,高厚磊,等.检测暂态零模电流相关性的小电流接地故障定位方法[J].电力系统自动化,2008,32(7):48-52.Ma Shicong,Xu Bingyin,Gao Houlei,et al.An earth fault locating method in feeder automation system by examining correlation of transient zero mode currents[J].Automation of Electric Power Systems,2008,32(7):48-52.
[12]孙波,张承慧,孙同景,等.基于暂态相电流的小电流接地故障定位研究[J].电力系统保护与控制,2012,40(18):75-80.Sun Bo,Zhang Chenghui,Sun Tongjing,et al.Earth fault location based on transient phase current in non-solidly earthed network[J].Power System Protection and Control,2012,40(18):75-80.
[13]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009:64-69.
[14]龚静.配电网单相接地故障选线中小波选取问题研究[J].电力系统保护与控制,2009,37(18):5-10.Gong Jing.Study of wavelet selection for single-phase earth fault line selection in distribution network[J].Power System Protection and Control,2009,37(18):5-10.
[15]龚静.小波模极大值原理在暂态电能质量扰动信号检测中的应用[J].东北电力技术,2009,30(5):10-13.Gong Jing.The use of wavelet modulus maximum principle in the detection of disturbance signal for transient power quality[J].Northeast E-lectric Power Technology,2009,30(5):10-13.
[2]贾清泉,刘连光,杨以涵,等.应用小波检测故障突变特性实现配电网小电流故障选线保护[J].中国电机工程学报,2001,21(10):78-82.Jia Qingquan,Liu Liangguang,Yang Yihan,et al.Abrupt change detection with wavelet for small current fault relaying[J].Proceedings of the CSEE,2001,21(10):78-82.
[3]贾清泉,肖鹏,杨以涵,等.小电流接地电网单相接地故障的小波选线方法[J].继电器,2001,29(3):5-8.Jia Qingquan,Xiao Peng,Yang Yihan,et al.Wavelets method to select single phase faulted circuit for small current grounding power systems[J].Relay,2001,29(3):5-8.
[4]齐郑,陈炯聪,杨奇逊.基于小波变换和LMS自适应滤波器的单相接地选线方法[J].电力系统自动化,2004,28(9):58-61.Qi Zheng,Chen Jiongcong,Yang Qixun.Selection of single-phase to ground fault line based on wavelet transform and LMS adaptive filter[J].Automation of Electric Power Systems,2004,28(9):58-61.
[5]肖白,束洪春,穆钢,等.基于模极大值理论的配电网接地保护研究[J].继电器,2004,32(10):36-39.Xiao Bai,Shu Hongchun,Mu Gang,et al.Study of grounding fault protection in distribution system based on the theory of modular maxima[J].Relay,2004,32(10):36-39.
[6]肖白,杜世君,周晓岩.一种基于小波变换的小接地电流系统单相接地故障选线方法[J].东北电力学院学报,2003,23(1):72-75.Xiao Bai,Du Shijun,Zhou Xiaoyan.A method of single-phase earthfault protection in distribution system based on wavelet transform[J].Northeast Electric Power College Journal,2003,23(1):72-75.
[7]戴剑锋,张艳霞.基于多频带分析的自适应配电网故障选线研究[J].中国电机工程学报,2003,23(5):44-47.Dai Jianfeng,Zhang Yanxia.Study on adaptively choosing fault line under single-phase to ground fault based on analysis of multi-frequency bands[J].Proceedings of the CSEE,2003,23(5):44-47.
[8]王耀南,霍百林,王辉,等.基于小波包的小电流接地系统故障选线的新判据[J].中国电机工程学报,2004,24(6):54-58.Wang Yaonan,Huo Bailin,Wang Hui,et al.A new criterion for earth fault line selection based on wavelet packets in small current neutral grounding system[J].Proceedings of the CSEE,2004,24(6):54-58.
[9]王军芬,康怡,韩钧,等.基于小波包的配电网单相接地故障判别[J].继电器,2005,33(24):10-15.Wang Junfen,Kang Yi,Han Jun,et al.Selection on single phase to ground fault line based on wavelet packets[J].Relay,2005,33(24):10-15.
[10]龚静.利用小波包分解系数实现配电网单相接地故障选线[J].电力系统保护与控制,2009,37(24):94-99.Gong Jing.Using wavelet packet decomposing coefficient to achieve distribution network single-phase ground fault line selection[J].Power System Protection and Control,2009,37(24):94-99.
[11]马士聪,徐丙垠,高厚磊,等.检测暂态零模电流相关性的小电流接地故障定位方法[J].电力系统自动化,2008,32(7):48-52.Ma Shicong,Xu Bingyin,Gao Houlei,et al.An earth fault locating method in feeder automation system by examining correlation of transient zero mode currents[J].Automation of Electric Power Systems,2008,32(7):48-52.
[12]孙波,张承慧,孙同景,等.基于暂态相电流的小电流接地故障定位研究[J].电力系统保护与控制,2012,40(18):75-80.Sun Bo,Zhang Chenghui,Sun Tongjing,et al.Earth fault location based on transient phase current in non-solidly earthed network[J].Power System Protection and Control,2012,40(18):75-80.
[13]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2009:64-69.
[14]龚静.配电网单相接地故障选线中小波选取问题研究[J].电力系统保护与控制,2009,37(18):5-10.Gong Jing.Study of wavelet selection for single-phase earth fault line selection in distribution network[J].Power System Protection and Control,2009,37(18):5-10.
[15]龚静.小波模极大值原理在暂态电能质量扰动信号检测中的应用[J].东北电力技术,2009,30(5):10-13.Gong Jing.The use of wavelet modulus maximum principle in the detection of disturbance signal for transient power quality[J].Northeast E-lectric Power Technology,2009,30(5):10-13.