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
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摘要
分析了过补偿度动态调节过程中,不同故障过渡电阻及馈线对地电容参数下故障馈线和非故障馈线零序电流的变化特性。建立了馈线线路零序电流关系表达式,在过补偿区域、欠补偿区域和全区域内动态调节过补偿度,给出了多场景下馈线零序电流变化曲线。分析结果表明:经过渡电阻单相接地故障下,在过补偿度小于零且大于故障线路对地电容占母线所有出线对地电容之和比例的相反数区间,故障线路与非故障线路零序电流幅值变化特性一致;在过补偿度大于零区间,当过渡电阻大于边界值时,两者变化特性一致,该边界值与馈线线路对地电容成反比。研究结果为残流增量法接地故障选线的改进提供了重要的理论依据。
Zero-sequence current variation characteristics of faulty and healthy distribution feeders with different fault resistances and earth capacities during the changing process of residual current compensation factors are analyzed.Firstly,the relational expression for zero-sequence current is given.Secondly,zero-sequence current variation curves of distribution feeders are presented for multi-parameter scenarios with residual current compensation factor varying in over-compensation,undercompensation and whole regions.The results show that once single-line-to-ground fault through resistance occurs,the zerosequence current variation characteristic of faulty feeder is consistent with that of healthy feeder under the following conditions:(1)residual current compensation factor is less than zero but greater than the opposite number of the ratio of faulty feeder's ground capacitance to total ground capacitance of all feeders;(2)fault resistance is greater than the boundary value which is inversely proportional to the ground capacitance of the feeder while the residual current compensation factor is greater than zero.The analysis results provide an important theoretical basis to the remnant current increment method.
Zero-sequence current variation characteristics of faulty and healthy distribution feeders with different fault resistances and earth capacities during the changing process of residual current compensation factors are analyzed.Firstly,the relational expression for zero-sequence current is given.Secondly,zero-sequence current variation curves of distribution feeders are presented for multi-parameter scenarios with residual current compensation factor varying in over-compensation,undercompensation and whole regions.The results show that once single-line-to-ground fault through resistance occurs,the zerosequence current variation characteristic of faulty feeder is consistent with that of healthy feeder under the following conditions:(1)residual current compensation factor is less than zero but greater than the opposite number of the ratio of faulty feeder's ground capacitance to total ground capacitance of all feeders;(2)fault resistance is greater than the boundary value which is inversely proportional to the ground capacitance of the feeder while the residual current compensation factor is greater than zero.The analysis results provide an important theoretical basis to the remnant current increment method.
引文
[1]国家能源局.国家能源局关于印发配电网建设改造行动计划(2015—2020年)的通知[EB/OL].[2015-08-31].http://zfxxgk.nea.gov.cn/auto84/201508/t20150831_1958.htm?keywords=.
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[11]邹浩斌,胡少强,刘利平,等.基于小扰动原理的单相接地选线装置[J].继电器,2007,35(2):20-24.ZHOU Haobin,HU Shaoqiang,LIU Liping,et al.Singlephase grounding selected-line equipment based on small disturbance theory[J].Relay,2007,35(2):20-24.
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[13]王玉梅,郭浩,惠胜达.基于残流增量法的谐振接地系统故障定位方法[J].电力系统自动化,2011,35(2):62-65.WANG Yumei,GUO Hao,HUI Shengda.Fault location approach for resonant grounded system based on remnant current increment method[J].Automation of Electric Power Systems,2011,35(2):62-65.
[14]吴秀全,张水平.小电流接地系统单相接地故障的改进小扰动选线法[J].广东电力,2015,28(4):86-90.WU Xiuquan,ZHANG Shuiping.Improved microvariations line selection method for single phase fault of low current grounding system[J].Guangdong Electric Power,2015,28(4):86-90.
[15]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.
[16]郑鹏鹏.小电流接地选线的工程实践与技术探讨[J].电力自动化设备,2003,23(6):82-85.ZHENG Pengpeng.Engineering practices and discussion of weak current grounding wire selection[J].Electric Power Automation Equipment,2003,23(6):82-85.
[17]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):84-89.ZENG Xiangjun,YIN Xianggen,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):84-89.
[18]康小宁,刘鑫,索南加乐,等.基于矩阵束算法的经消弧线圈接地系统故障选线新方法[J].电力系统自动化,2012,36(12):88-93.KANG Xiaoning,LIU Xin,SUONAN Jiale,et al.New method for fault line selection in non-solidly grounded system based on matrix pencil method[J].Automation of Electric Power Systems,2012,36(12):88-93.
[2]LIU Junyong,GAO Hongjun,MA Zhao,et al.Review and prospect of active distribution system planning[J].Journal of Modern Power Systems and Clean Energy,2015,3(4):457-467.
[3]薛永端,郭丽伟,张林利,等.有源配电网中性点接地方式的选择问题[J].电力系统自动化,2015,39(13):129-136.DOI:10.7500/AEPS20140717003.XUE Yongduan,GUO Liwei,ZHANG Linli,et al.Selection problems of neutral grounding mode in active distribution networks[J].Automation of Electric Power Systems,2015,39(13):129-136.DOI:10.7500/AEPS20140717003.
[4]TANG Jinrui,YIN Xianggen,WEN Minghao,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.
[5]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.
[6]王朋,田翠华,陈柏超,等.基于新型磁控消弧线圈的电磁混合消弧及配合选线新方法[J].电工技术学报,2015,30(16):175-183.WANG Peng,TIAN Cuihua,CHEN Baichao,et al.Electromagnetic hybrid arc suppression and a novel method of feeder selection based on the novel magnetic controlled Petersen coil[J].Transactions of China Electrotechnical Society,2015,30(16):175-183.
[7]陈筱薷,薛永端,王超,等.基于同步量测的谐振接地系统高阻接地故障区段暂态定位[J].电力系统自动化,2016,40(22):93-99.DOI:10.7500/AEPS20160315016.CHEN Xiaoru,XUE Yongduan,WANG Chao,et al.Synchronous measurement based transient high resistance earth fault location in resonant grounding system[J].Automation of Electric Power Systems,2016,40(22):93-99.DOI:10.7500/AEPS20160315016.
[8]刘健,张志华,张小庆,等.基于配电自动化系统的单相接地定位[J].电力系统自动化,2017,41(1):145-149.DOI:10.7500/AEPS20160118005.LIU Jian,ZHANG Zhihua,ZHANG Xiaoqing,et al.Single phase to ground fault location based on distribution automation systems[J].Automation of Electric Power Systems,2017,41(1):145-149.DOI:10.7500/AEPS20160118005.
[9]曾祥君,王媛媛,李健,等.基于配电网柔性接地控制的故障消弧与馈线保护新原理[J].中国电机工程学报,2012,32(16):137-143.ZENG Xiangjun,WANG Yuanyuan,LI Jian,et al.Novel principle of faults arc extinguishing&feeder protection based on flexible grounding control for distribution networks[J].Proceedings of the CSEE,2012,32(16):137-143.
[10]胡佐,李欣然,李培强.小电流接地系统单相故障选线的方法与实现[J].高电压技术,2007,33(1):41-44.HU Zuo,LI Xinran,LI Peiqiang.Method of fault line location and its implementation[J].High Voltage Engineering,2007,33(1):41-44.
[11]邹浩斌,胡少强,刘利平,等.基于小扰动原理的单相接地选线装置[J].继电器,2007,35(2):20-24.ZHOU Haobin,HU Shaoqiang,LIU Liping,et al.Singlephase grounding selected-line equipment based on small disturbance theory[J].Relay,2007,35(2):20-24.
[12]李捍平,崔芳芳.谐振接地系统小扰动选线方法分析[J].华中电力,2009,22(6):51-54.LI Hanping,CUI Fangfang.Study on fault line detection based on electric current waving of arc coil grounding system[J].Central China Electric Power,2009,22(6):51-54.
[13]王玉梅,郭浩,惠胜达.基于残流增量法的谐振接地系统故障定位方法[J].电力系统自动化,2011,35(2):62-65.WANG Yumei,GUO Hao,HUI Shengda.Fault location approach for resonant grounded system based on remnant current increment method[J].Automation of Electric Power Systems,2011,35(2):62-65.
[14]吴秀全,张水平.小电流接地系统单相接地故障的改进小扰动选线法[J].广东电力,2015,28(4):86-90.WU Xiuquan,ZHANG Shuiping.Improved microvariations line selection method for single phase fault of low current grounding system[J].Guangdong Electric Power,2015,28(4):86-90.
[15]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.
[16]郑鹏鹏.小电流接地选线的工程实践与技术探讨[J].电力自动化设备,2003,23(6):82-85.ZHENG Pengpeng.Engineering practices and discussion of weak current grounding wire selection[J].Electric Power Automation Equipment,2003,23(6):82-85.
[17]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):84-89.ZENG Xiangjun,YIN Xianggen,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):84-89.
[18]康小宁,刘鑫,索南加乐,等.基于矩阵束算法的经消弧线圈接地系统故障选线新方法[J].电力系统自动化,2012,36(12):88-93.KANG Xiaoning,LIU Xin,SUONAN Jiale,et al.New method for fault line selection in non-solidly grounded system based on matrix pencil method[J].Automation of Electric Power Systems,2012,36(12):88-93.