自适应时频窗行波选线方法研究
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摘要
数字化行波选线方法与行波分析所选的时间窗宽度、频带范围密切相关,时频窗的选择在一定程度上决定了行波选线的性能。提出一种利用自适应时频窗的高可靠性行波选线新方法。该方法利用线路零模电流行波两两之间的交叉小波变换(cross wavelet transform,XWT),自适应求取出零模电流行波相关性较强的时频窗,作为行波选线的时频窗,同时计算出零模电流行波在该时频窗内的相位差。最后通过自适应时频窗内的零模电流二进小波变换模极大值进行选线,确定故障线路。所提方法充分结合了复小波变换在频带分析方面的优势和实小波变换在突变检测方面的优势。理论分析与仿真结果表明,所提方法选线可靠性高,交叉小波变换应用合理,且不受中性点接地方式、线路结构等因素的影响。
Digital traveling wave based fault feeder selection is closely related to analyzed time span and frequency band. The selection of time-frequency window determines the performance of fault feeder selection algorithm. A novel traveling wave based fault line selection method was proposed, which is based on adaptive time-frequency window. The cross wavelet transform(XWT) between zero mode currents of two feeders were calculated, and the time-frequency window with higher relativity were extracted. The phases between zero mode currents were also obtained by XWT. The faulted feeder was identified in the adaptive time-frequency window by comparison of dyadic wavelet maxima of feeders' zero mode currents. The proposed method combines the advantages of complex wavelet for frequency band analysis and the real wavelet for singularity identification. Theoretical analysis and simulation results prove that the proposed method has high reliability. The application of XWT is reasonable. The performance of the proposed method is not affected by the neutral point grounding type, and feeder structure, etc.
Digital traveling wave based fault feeder selection is closely related to analyzed time span and frequency band. The selection of time-frequency window determines the performance of fault feeder selection algorithm. A novel traveling wave based fault line selection method was proposed, which is based on adaptive time-frequency window. The cross wavelet transform(XWT) between zero mode currents of two feeders were calculated, and the time-frequency window with higher relativity were extracted. The phases between zero mode currents were also obtained by XWT. The faulted feeder was identified in the adaptive time-frequency window by comparison of dyadic wavelet maxima of feeders' zero mode currents. The proposed method combines the advantages of complex wavelet for frequency band analysis and the real wavelet for singularity identification. Theoretical analysis and simulation results prove that the proposed method has high reliability. The application of XWT is reasonable. The performance of the proposed method is not affected by the neutral point grounding type, and feeder structure, etc.
引文
[1]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 traveling wave for distribution lines[J].Proceeding of CSEE,2014,34(34):6216-6227(in Chinese).
[2]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):6-11.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):6-11(in Chinese).
[3]曾祥君,尹项根,张哲,等.配电网接地故障负序电流分布及接地保护原理研究[J].中国电机工程学报,2001,21(6):85-90.Zeng Xiangjun,Yin Xiang gen,Zhang Zhe,et al.Study for negative sequence current distributing and ground fault protection in middle voltage power systems[J].Proceedings of the CSEE,2001,21(6):85-90(in Chinese).
[4]薛永端,徐丙垠,冯祖仁,等.小电流接地故障暂态方向保护原理研究[J].中国电机工程学报,2003,23(7):51-56.Xue Yongduan,Xu Bingyin,Feng Zuren,et al.The principle of directional earth fault protection using zero sequence transients in non-solid earthed network[J].Proceedings of the CSEE,2003,23(7):51-56(in Chinese).
[5]Cui Tao,Dong Xinzhou,Bo Zhiqian,et al.Hilberttransform-based transient/intermittent earth fault detection in non-effectively grounded distribution systems[J].IEEE Transactions on Power Delivery,2011,26(1):143-151.
[6]李嘉陵.在消弧线圈接地系统中利用五次谐波零序功率方向鉴别故障线路[J].继电器,1975,(2):26-28.Li Jialing.Identify fault feeder in compensated grounded system using five harmonic zero-sequence power direction[J].Relay,1975(2):26-28(in Chinese).
[7]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):1-6.Dong Xinzhou,BI Jian-guang.Analysis on transient traveling wave and study on fault line selection for distribution lines[J].Proceedings of the CSEE,2005,25(4):1-6(in Chinese).
[8]Dong Xinzhou,Shi Shenxing.Identifying single-phaseto-ground fault feeder in neutral noneffectively grounded distribution system using wavelet transform[J].IEEE Transactions on Power Delivery,2008,23(4):1829-1837.
[9]El-hami M,Lai L L,Daruvala D J,et al.A new travelling-wave based scheme for fault detection on overhead power distribution feeders[J].IEEE Transactions on Power Delivery,1992,7(4):1825-1833.
[10]毕见广,董新洲,周双喜.基于两相电流行波的接地选线方法[J].电力系统自动化,2005,29(3):17-20,50.Bi Jianguang,Dong Xinzhou,Zhou Shuangxi.Fault line selection based on two-phase current traveling wave[J].Automation of Electric Power System,2005,29(3):17-20,50(in Chinese).
[11]毛鹏,段玉倩,姜娜.基于相关分析的故障选线方法[J].电网技术,2004,28(2):36-39.Mao Peng,Duan Yuqian,Jiang Na.A correlation analysis based method to detect faulty line under single phase to ground fault occurred in distribution network with small current neutral grounding[J].Power System Technology,2004,28(2):36-39.
[12]王玉梅,董洋洋,刘兴艳.基于SFB和相关分析法的小电流接地故障选线方法[J].电力自动化设备,2011,31(2):48-51.Wang Yumei,Dong Yangyang,Liu Xingyan.Selection of faulty line based on SFB and correlation analysis for small-current neutral grounding system[J].Electric Power Automation Equipment,2011,31(2):48-51(in Chinese).
[13]束洪春,徐亮,彭仕欣,孙向飞.谐振接地电网故障选线相关分析法[J].电力自动化设备,2008,28(9):6-9,48.Shu Hongchun,Xu Liang,Peng Shixin,Sun Xiangfei.Correlation analysis for faulty feeder detection in resonant earthed system[J].Electric Power Automation Equipment.2008,28(9):6-9,48(in Chinese).
[14]郭谋发,刘世丹,杨耿杰.利用时频谱相似度识别的配电线路接地选线方法[J].中国电机工程学报,2013,33(19):183-190.Guo Moufa,Liu Shidan,Yang Gengjie.A novel approach to detect fault line in distribution network using similarity recognition based on time-frequency spectrum[J].Proceedings of the CSEE,2013,33(19):183-190(in Chinese).
[15]Torrence C,Compo G P.A practical guide to wavelet analysis[J].Bulletin of the American Meteorological Society,1998.
[16]Grinsted A,Moore J C,Jevrejeva S.Application of the cross wavelet transform and wavelet coherence to geophysical time series[J].Nonlinear Processes in Geophysics,2004,11(5/6):561-566.
[17]钱鑫,施围.同杆双回路不同换位下模量分析[J].电网技术,2001,25(8):24-27.Qian Xin,Shi Wei.Mode analysis of different transposed double circuit on same tower[J].Power System Technology,2001,25(8):24-27(in Chinese).
[18]王世勇.基于极化电流行波的方向比较式纵联保护研究[D].北京:清华大学,2011.Wang Shiyong.Studies on directional comparison pilot protection based on polarized current travelling wave[D].Beijing:Tsinghua University,2011(in Chinese).
[19]董新洲,王世勇,施慎行.极化电流行波方向继电器[J].电力系统自动化,2011,35(21):78-83.Dong Xinzhou,Wang Shiyong,Shi Shenxing.Polarized current travelling-wave based directional relay[J].Automation of Electric Power System,2011,35(21):78-83(in Chinese).
[20]王珺,董新洲,施慎行.配电线路单相接地行波保护的实现与试验[J].中国电机工程学报,2013,33(13):172-178.Wang Jun,Dong Xinzhou,Shi Shenxing.Scheme and test of traveling-waves based single-phase-to-ground protection for distribution lines[J].Proceedings of the CSEE,2013,33(13):172-178(in Chinese).
[2]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):6-11.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):6-11(in Chinese).
[3]曾祥君,尹项根,张哲,等.配电网接地故障负序电流分布及接地保护原理研究[J].中国电机工程学报,2001,21(6):85-90.Zeng Xiangjun,Yin Xiang gen,Zhang Zhe,et al.Study for negative sequence current distributing and ground fault protection in middle voltage power systems[J].Proceedings of the CSEE,2001,21(6):85-90(in Chinese).
[4]薛永端,徐丙垠,冯祖仁,等.小电流接地故障暂态方向保护原理研究[J].中国电机工程学报,2003,23(7):51-56.Xue Yongduan,Xu Bingyin,Feng Zuren,et al.The principle of directional earth fault protection using zero sequence transients in non-solid earthed network[J].Proceedings of the CSEE,2003,23(7):51-56(in Chinese).
[5]Cui Tao,Dong Xinzhou,Bo Zhiqian,et al.Hilberttransform-based transient/intermittent earth fault detection in non-effectively grounded distribution systems[J].IEEE Transactions on Power Delivery,2011,26(1):143-151.
[6]李嘉陵.在消弧线圈接地系统中利用五次谐波零序功率方向鉴别故障线路[J].继电器,1975,(2):26-28.Li Jialing.Identify fault feeder in compensated grounded system using five harmonic zero-sequence power direction[J].Relay,1975(2):26-28(in Chinese).
[7]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):1-6.Dong Xinzhou,BI Jian-guang.Analysis on transient traveling wave and study on fault line selection for distribution lines[J].Proceedings of the CSEE,2005,25(4):1-6(in Chinese).
[8]Dong Xinzhou,Shi Shenxing.Identifying single-phaseto-ground fault feeder in neutral noneffectively grounded distribution system using wavelet transform[J].IEEE Transactions on Power Delivery,2008,23(4):1829-1837.
[9]El-hami M,Lai L L,Daruvala D J,et al.A new travelling-wave based scheme for fault detection on overhead power distribution feeders[J].IEEE Transactions on Power Delivery,1992,7(4):1825-1833.
[10]毕见广,董新洲,周双喜.基于两相电流行波的接地选线方法[J].电力系统自动化,2005,29(3):17-20,50.Bi Jianguang,Dong Xinzhou,Zhou Shuangxi.Fault line selection based on two-phase current traveling wave[J].Automation of Electric Power System,2005,29(3):17-20,50(in Chinese).
[11]毛鹏,段玉倩,姜娜.基于相关分析的故障选线方法[J].电网技术,2004,28(2):36-39.Mao Peng,Duan Yuqian,Jiang Na.A correlation analysis based method to detect faulty line under single phase to ground fault occurred in distribution network with small current neutral grounding[J].Power System Technology,2004,28(2):36-39.
[12]王玉梅,董洋洋,刘兴艳.基于SFB和相关分析法的小电流接地故障选线方法[J].电力自动化设备,2011,31(2):48-51.Wang Yumei,Dong Yangyang,Liu Xingyan.Selection of faulty line based on SFB and correlation analysis for small-current neutral grounding system[J].Electric Power Automation Equipment,2011,31(2):48-51(in Chinese).
[13]束洪春,徐亮,彭仕欣,孙向飞.谐振接地电网故障选线相关分析法[J].电力自动化设备,2008,28(9):6-9,48.Shu Hongchun,Xu Liang,Peng Shixin,Sun Xiangfei.Correlation analysis for faulty feeder detection in resonant earthed system[J].Electric Power Automation Equipment.2008,28(9):6-9,48(in Chinese).
[14]郭谋发,刘世丹,杨耿杰.利用时频谱相似度识别的配电线路接地选线方法[J].中国电机工程学报,2013,33(19):183-190.Guo Moufa,Liu Shidan,Yang Gengjie.A novel approach to detect fault line in distribution network using similarity recognition based on time-frequency spectrum[J].Proceedings of the CSEE,2013,33(19):183-190(in Chinese).
[15]Torrence C,Compo G P.A practical guide to wavelet analysis[J].Bulletin of the American Meteorological Society,1998.
[16]Grinsted A,Moore J C,Jevrejeva S.Application of the cross wavelet transform and wavelet coherence to geophysical time series[J].Nonlinear Processes in Geophysics,2004,11(5/6):561-566.
[17]钱鑫,施围.同杆双回路不同换位下模量分析[J].电网技术,2001,25(8):24-27.Qian Xin,Shi Wei.Mode analysis of different transposed double circuit on same tower[J].Power System Technology,2001,25(8):24-27(in Chinese).
[18]王世勇.基于极化电流行波的方向比较式纵联保护研究[D].北京:清华大学,2011.Wang Shiyong.Studies on directional comparison pilot protection based on polarized current travelling wave[D].Beijing:Tsinghua University,2011(in Chinese).
[19]董新洲,王世勇,施慎行.极化电流行波方向继电器[J].电力系统自动化,2011,35(21):78-83.Dong Xinzhou,Wang Shiyong,Shi Shenxing.Polarized current travelling-wave based directional relay[J].Automation of Electric Power System,2011,35(21):78-83(in Chinese).
[20]王珺,董新洲,施慎行.配电线路单相接地行波保护的实现与试验[J].中国电机工程学报,2013,33(13):172-178.Wang Jun,Dong Xinzhou,Shi Shenxing.Scheme and test of traveling-waves based single-phase-to-ground protection for distribution lines[J].Proceedings of the CSEE,2013,33(13):172-178(in Chinese).
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