一种基于参数识别的配电网单相接地故障区段定位方法
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摘要
针对中性点接地方式、配电网规模、过渡电阻等因素导致配电网单相接地故障选线和故障区段定位一直没有得到圆满解决的问题,提出了一种基于参数识别的配电网单相接地故障区段定位新方法。在零序网络中,对于特定的频带,正常线路与故障线上故障点之后的线路可以等效为正电容,而故障线上故障点之前的线路可以等效为负电容,在配电网各线路出口及分支处安装保护装置,利用保护装置测量得到的零序电压和零序电流识别各区段电容值,根据识别得到电容值的正负即可判别故障区段,进而结合网络拓扑即可实现故障区段定位。PSCAD仿真结果和动模实验表明,该方法耐过渡电阻能力强,在各种工况下均能可靠地选出故障区段,计算简单,易于实现,具有一定的实用价值。
Aiming at dissatisfactory solution to single-phase grounding fault line selection and fault section location of the power distribution network caused by the influence of neutral point grounding mode, power distribution network scale, the transition resistance, and so on, this paper presents a kind of new method for single-phase grounding fault section location based on parameter identification. In the zero sequence network for those specific frequency bands, normal lines and lines at back of the fault point can be equalized to positive capacitance, while lines in front of the fault point can be equalized to negative capacitance. By using the protection device installed at the export and the branch of every line, it can obtain zero sequence voltage and zero sequence current from measurement, and then identify capacitance values of sections. Then it can distinguish fault sections according to capacitance values and realize fault section location combining network topology. PSCAD simulation results and dynamic model experiments indicate that this method is resistant to high transition resistance and is able to pick out fault sections under various working conditions. In addition, the method is simple in calculation and easy to be realized, which means it has a certainly practical value.
Aiming at dissatisfactory solution to single-phase grounding fault line selection and fault section location of the power distribution network caused by the influence of neutral point grounding mode, power distribution network scale, the transition resistance, and so on, this paper presents a kind of new method for single-phase grounding fault section location based on parameter identification. In the zero sequence network for those specific frequency bands, normal lines and lines at back of the fault point can be equalized to positive capacitance, while lines in front of the fault point can be equalized to negative capacitance. By using the protection device installed at the export and the branch of every line, it can obtain zero sequence voltage and zero sequence current from measurement, and then identify capacitance values of sections. Then it can distinguish fault sections according to capacitance values and realize fault section location combining network topology. PSCAD simulation results and dynamic model experiments indicate that this method is resistant to high transition resistance and is able to pick out fault sections under various working conditions. In addition, the method is simple in calculation and easy to be realized, which means it has a certainly practical value.
引文
[1] 王建元,许宁,杨薏霏.基于希尔伯特-黄变换与分形维数的配电网选线研究[J]. 广东电力, 2015,28(11): 37-43. WANG Jianyuan, XU Ning, YANG Yifei.Study on fault line detection based on Hilbert-Huang transform and fractal correlation dimension in distribution network [J].Guangdong Electric Power, 2015, 28(11):37- 43.
[2] 严敏敏,陈平,周新军,等.基于瞬时负序分量的小电流接地选线[J].广东电力,2017,30(3):87- 93. YAN Minmin, CHEN Ping, ZHOU Xinjun,et al. Fault line selection for small current based on instantneous negatives equence componenr[J]. Guangdong Electric Power, 2017, 30(3):87- 93.
[3] 黄妍妍,李天友,黄建业,等. 多判据融合的配电网谐振接地系统单相接地故障选线方法[J]. 供用电,2016,33(11):56-62. HUANG Yanyan,LI Tianyou,HUANG Jianye,et al. Method of single-phase earth fault line selection in resonant grounding system of distribution network based on multi-criterion fusion [J]. Distribution & Utilization,2016,33(11):56-62.
[4] 刘柱揆,曹敏,董涛.基于波形相似度的小电流接地故障选线[J].电力系统保护与控制,2017,45(21):89-95. LIU Zhukui,CAO Min,DONG Tao.Fault line selection of neutral indirectly grounding system based on waveform similarity[J].Power System Protection and Control,2017,45(21):89-95.
[5] 曾祥君,尹项根,于永源,等.基于注入变频信号法的经消弧线圈接地系统控制与保护新方法[J].中国电机工程学报,2000,20(1):29-32. ZENG Xiangjun,YIN Xianggen,YU Yongyuan,et al. New methods for control and protection relay in a compensated medium voltage distribution network based on injecting various frequency current[J].Proceedings of the CSEE,2000,20(1):29-32.
[6] 罗飞,焦在滨,马钊,等.直流配电网故障分析和继电保护综述[J].供用电,2018,35(6):3-11. LUO Fei,JIAO Zaibin,MA Zhao,et al. Review of fault analysis and relay protection of DC distribution network[J].Distribution & Utilization,2018,35(6):3-11.
[7] 陈彬.基于稳态特征的配电网小电流接地故障定位方法[J]. 广东电力, 2017,30(10): 116-120. CHEN Bin.Grounding faulit location method for small current of power distribution network based on steady-state characteristic[J].Guangdong Electric Power, 2017,30(10): 116-120.
[8] 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): 69-74. SUN Bo, ZHANG Chenghui, SUN Tongjing, et al. Earth fault location based on transient phase current in non-solidly earthed network[J]. Power System Protectionand Control, 2012, 40(18): 69-74.
[9] 孙桂花,王敬华,张璇,等.分布式智能的小电流接地故障定位方法[J].电力系统保护与控制,2017,45(16):72-78. SUN Guihua,WANG Jinghua, ZHANG Xuan, et al. Small current grounding fault location method of distributed intelligence[J].Power System Protection and Control,2017,45(16):72-78.
[10] 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.
[11] 索南加乐,张超,王树刚.基于模型参数识别法的小电流接地故障选线研究[J]. 电力系统及其自动化,2004,28(19):65-70. SUONAN Jiale,ZHANG Chao,WANG Shugang.Fault line selection in the non-solid earthed network based on the model identification method[J].Automation of Electric Power Systems,2004,28(19):65-70.
[12] 李振然,贾旭彩,李滨.基于小波变换与BP 神经网络相结合的配电网单相接地故障定位方法[J].继电器,2004,32(9):24-26. LI Zhenran, JIA Xucai, LI Bin. Fault location for single-phase-to-earth fault using the combination of wavelet transform and BP neural network[J].Relay, 2004, 32(9): 24-26.
[13] 刘洋,郭威,邢春阳,等基于双数复小波变换的配电网故障选线[J].广东电力,2016,29(12):121- 126. LIU Yang, GUO Wei, XING Chunyang, et al. Fault line selection for power distribution netwok based on duru-tree complex wavelet transform[J].Guangdong Electric Power, 2016, 29(12):121-126.
[14] 张帆, 潘贞存, 张慧芬, 等. 树型配电网单相接地故障行波测距新算法[J]. 中国电机工程学报, 2007,27(28): 46-52. ZHANG Fan, PAN Zhencun, ZHANG Huifen, et al. New algorithm based on traveling wave for location of single phase to ground fault in tree type distribution network[J]. Proceedings of the CSEE, 2007, 27(18):46-52.
[15] 宋国兵,靳幸福, 李德坤,等. 识别模型参数的电压源换流器型直流输电线路纵联保护[J]. 西安交通大学学报, 2013,47(8): 110-114. SONG Guobing, JIN Xingfu, LI Dekun, et al. Novel pilot Protection for voltage source converter high voltage direct current transmission lines by identifying model parameter [J]. Journal of Xi'an Jiaotong University, 2013,47(8): 110-114.
[16] 李广.配电网单相接地故障区段定位研究:[D]. 西安:西安交通大学,2012.
[17] 姜铁卫,杨锐,夏磊.残流增量法在调匝式消弧线圈接地系统中的可行性分析[J].江苏电机工程,2016,35(4):64-66. JIANG Tiewei, YANG Rui, XIA Lei. Feasibility analysis of residual current increment for fault line detecting in multi-tap arc-suppression coil grounding system[J]. Jiangsu Electrical Engineering, 2016,35(4):64-66.
[18] 李子龙,刘涛,黄胜强,等.基于泄放能量函数的配电网线路故障定位方法研究[J].智慧电力,2017,45(7):106-111. LI Zilong, LIU Tao, HUANG Shengqiang, et al. Study on fault location method based on leakage energy function[J].Smart Power,2017,45(7):106-111.
[2] 严敏敏,陈平,周新军,等.基于瞬时负序分量的小电流接地选线[J].广东电力,2017,30(3):87- 93. YAN Minmin, CHEN Ping, ZHOU Xinjun,et al. Fault line selection for small current based on instantneous negatives equence componenr[J]. Guangdong Electric Power, 2017, 30(3):87- 93.
[3] 黄妍妍,李天友,黄建业,等. 多判据融合的配电网谐振接地系统单相接地故障选线方法[J]. 供用电,2016,33(11):56-62. HUANG Yanyan,LI Tianyou,HUANG Jianye,et al. Method of single-phase earth fault line selection in resonant grounding system of distribution network based on multi-criterion fusion [J]. Distribution & Utilization,2016,33(11):56-62.
[4] 刘柱揆,曹敏,董涛.基于波形相似度的小电流接地故障选线[J].电力系统保护与控制,2017,45(21):89-95. LIU Zhukui,CAO Min,DONG Tao.Fault line selection of neutral indirectly grounding system based on waveform similarity[J].Power System Protection and Control,2017,45(21):89-95.
[5] 曾祥君,尹项根,于永源,等.基于注入变频信号法的经消弧线圈接地系统控制与保护新方法[J].中国电机工程学报,2000,20(1):29-32. ZENG Xiangjun,YIN Xianggen,YU Yongyuan,et al. New methods for control and protection relay in a compensated medium voltage distribution network based on injecting various frequency current[J].Proceedings of the CSEE,2000,20(1):29-32.
[6] 罗飞,焦在滨,马钊,等.直流配电网故障分析和继电保护综述[J].供用电,2018,35(6):3-11. LUO Fei,JIAO Zaibin,MA Zhao,et al. Review of fault analysis and relay protection of DC distribution network[J].Distribution & Utilization,2018,35(6):3-11.
[7] 陈彬.基于稳态特征的配电网小电流接地故障定位方法[J]. 广东电力, 2017,30(10): 116-120. CHEN Bin.Grounding faulit location method for small current of power distribution network based on steady-state characteristic[J].Guangdong Electric Power, 2017,30(10): 116-120.
[8] 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): 69-74. SUN Bo, ZHANG Chenghui, SUN Tongjing, et al. Earth fault location based on transient phase current in non-solidly earthed network[J]. Power System Protectionand Control, 2012, 40(18): 69-74.
[9] 孙桂花,王敬华,张璇,等.分布式智能的小电流接地故障定位方法[J].电力系统保护与控制,2017,45(16):72-78. SUN Guihua,WANG Jinghua, ZHANG Xuan, et al. Small current grounding fault location method of distributed intelligence[J].Power System Protection and Control,2017,45(16):72-78.
[10] 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.
[11] 索南加乐,张超,王树刚.基于模型参数识别法的小电流接地故障选线研究[J]. 电力系统及其自动化,2004,28(19):65-70. SUONAN Jiale,ZHANG Chao,WANG Shugang.Fault line selection in the non-solid earthed network based on the model identification method[J].Automation of Electric Power Systems,2004,28(19):65-70.
[12] 李振然,贾旭彩,李滨.基于小波变换与BP 神经网络相结合的配电网单相接地故障定位方法[J].继电器,2004,32(9):24-26. LI Zhenran, JIA Xucai, LI Bin. Fault location for single-phase-to-earth fault using the combination of wavelet transform and BP neural network[J].Relay, 2004, 32(9): 24-26.
[13] 刘洋,郭威,邢春阳,等基于双数复小波变换的配电网故障选线[J].广东电力,2016,29(12):121- 126. LIU Yang, GUO Wei, XING Chunyang, et al. Fault line selection for power distribution netwok based on duru-tree complex wavelet transform[J].Guangdong Electric Power, 2016, 29(12):121-126.
[14] 张帆, 潘贞存, 张慧芬, 等. 树型配电网单相接地故障行波测距新算法[J]. 中国电机工程学报, 2007,27(28): 46-52. ZHANG Fan, PAN Zhencun, ZHANG Huifen, et al. New algorithm based on traveling wave for location of single phase to ground fault in tree type distribution network[J]. Proceedings of the CSEE, 2007, 27(18):46-52.
[15] 宋国兵,靳幸福, 李德坤,等. 识别模型参数的电压源换流器型直流输电线路纵联保护[J]. 西安交通大学学报, 2013,47(8): 110-114. SONG Guobing, JIN Xingfu, LI Dekun, et al. Novel pilot Protection for voltage source converter high voltage direct current transmission lines by identifying model parameter [J]. Journal of Xi'an Jiaotong University, 2013,47(8): 110-114.
[16] 李广.配电网单相接地故障区段定位研究:[D]. 西安:西安交通大学,2012.
[17] 姜铁卫,杨锐,夏磊.残流增量法在调匝式消弧线圈接地系统中的可行性分析[J].江苏电机工程,2016,35(4):64-66. JIANG Tiewei, YANG Rui, XIA Lei. Feasibility analysis of residual current increment for fault line detecting in multi-tap arc-suppression coil grounding system[J]. Jiangsu Electrical Engineering, 2016,35(4):64-66.
[18] 李子龙,刘涛,黄胜强,等.基于泄放能量函数的配电网线路故障定位方法研究[J].智慧电力,2017,45(7):106-111. LI Zilong, LIU Tao, HUANG Shengqiang, et al. Study on fault location method based on leakage energy function[J].Smart Power,2017,45(7):106-111.