基于同向量电流选相的电流平衡保护研究
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摘要
针对传统平行双回线路电流平衡保护不能反应跨线故障的问题,提出了基于同向量电流选相的电流平衡保护方案。首先利用同向量电流突变量实现故障选相,并给出了两相短路与三相短路的判别方法。然后利用反向量与同向量的幅值比判别故障相是否为跨线故障。对于跨线故障相,利用单回线距离保护判别故障区域;对于单回线故障相,利用同名相电流的幅值大小进行选线跳闸。利用六序故障分量法分析了各种故障情况下的选相判据以及保护判据,并给出了保护流程。最后理论分析和ATP-EMTP仿真结果均验证了方案的正确性和有效性。该方案能够反应跨线故障,保护性能得到了改善。
Traditional current balance protection on double-circuit transmission line can not react to the interline fault, thus a current balance protection based on the same directional component current phase selection is proposed. First, the fault phase selection is realized by using the incremental quantity of the same directional component current. The discriminant method of two-phase short circuit and three-phase short circuit is provided. Then, the ratio of the opposite direction component current to same directional component current is used to judge whether the fault phase is interline fault. For the interline fault phase, the fault location is determined by distance protection of singe-circuit transmission line. For singe-circuit transmission line fault phase, the fault line selection is determined by the magnitude of the same-name-phase. The six-sequence fault component is used to analyze the phase selection criterion and the protection criterion under different fault types, and a specific protection process is proposed. The correctness and effectiveness of the proposed scheme are verified by both theoretical analysis and ATP-EMTP simulation results. The scheme can react to the interline fault and the protection performance is improved.
Traditional current balance protection on double-circuit transmission line can not react to the interline fault, thus a current balance protection based on the same directional component current phase selection is proposed. First, the fault phase selection is realized by using the incremental quantity of the same directional component current. The discriminant method of two-phase short circuit and three-phase short circuit is provided. Then, the ratio of the opposite direction component current to same directional component current is used to judge whether the fault phase is interline fault. For the interline fault phase, the fault location is determined by distance protection of singe-circuit transmission line. For singe-circuit transmission line fault phase, the fault line selection is determined by the magnitude of the same-name-phase. The six-sequence fault component is used to analyze the phase selection criterion and the protection criterion under different fault types, and a specific protection process is proposed. The correctness and effectiveness of the proposed scheme are verified by both theoretical analysis and ATP-EMTP simulation results. The scheme can react to the interline fault and the protection performance is improved.
引文
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[16]梁振锋,宋国兵,康小宁,等.数字化变电站同杆并架平行双回线路保护的研究[J].西安理工大学学报,2012,28(4):444-448.LIANG Zhenfeng,SONG Guobing,KANG Xiaoning,et al.Research on the protective relaying for double-circuit lines on the same tower in digital substation[J].Journal of Xi’an University of Technology,2012,28(4):444-448.
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[19]葛耀中.新型继电保护与故障测距原理与技术[M].2版.西安:西安交通大学出版社,2007:146-149.
[20]索南加乐.同杆双回线的故障分析及继电保护[D].西安:西安交通大学,1991.
[21]ZHANG Hai,SHENG Wanxing.A fault phase selection scheme based on ratio of opposite-direction-current to same-direction-current for parallel lines[C]//2014International Conference on Power System Tech,October20-22,2014,Chengdu,China:512-517.
[2]朱忆洋,都洪基,赵青春.不对称参数同杆双回线选相方法研究[J].电力系统保护与控制,2017,45(15):133-139.ZHU Yiyang,DU Hongji,ZHAO Qingchun.Research on phase selection for double-circuit lines on the same tower with asymmetrical parameters[J].Power System Protection and Control,2017,45(15):133-139.
[3]陈文哲,郝治国,张保会,等.同塔双回线纵向故障特征分析及零序方向保护改进[J].电力自动化设备,2016,36(11):133-139.CHEN Wenzhe,HAO Zhiguo,ZHANG Baohui,et al.Characteristic analysis on longitudinal fault of dual-circuit transmission line and improvement of zero-sequence directional protection[J].Electric Power Automation Equipment,2016,36(11):133-139.
[4]徐海洋,黄兴华,王婷,等.同塔双回线零序电压补偿分析[J].电力系统保护与控制,2017,45(4):86-92.XU Haiyang,HUANG Xinghua,WANG Ting,et al.Analysis of zero-sequence voltage compensation in doublecircuit transmission system[J].Power System Protection and Control,2017,45(4):86-92.
[5]谢俊,李勇,刘宏君,等.线路纵联零序方向保护误动机理分析及对策研究[J].电力系统保护与控制,2017,45(4):19-25.XIE Jun,LI Yong,LIU Hongjun,et al.Mechanism analysis and countermeasure research on the misoperation of the zero sequence directional pilot protection of line[J].Power System Protection and Control,2017,45(4):19-25.
[6]张旭,徐振宇,杨奇逊,等.特高压平行双回线路高阻短路下距离保护算法(英文)[J].电网技术,2015,39(1):182-189.ZHANG Xu,XU Zhenyu,YANG Qixun,et al.A distance protection algorithm for UHV parallel transmission line with high-resistance short circuit fault(in English)[J].Power System Technology,2015,39(1):182-189.
[7]周春霞,余越,赵寒,等.特高压同塔双回线路零序电流补偿系数整定对接地距离保护的影响研究[J].电网技术,2012,36(12):106-110.ZHOU Chunxia,YU Yue,ZHAO Han,et al.Influence of zero-sequence current compensation coefficient setting on earth-fault distance protection for double circuit UHVAC transmission lines on the same tower[J].Power System Technology,2012,36(12):106-110.
[8]李伟,毕天姝,徐振宇,等.同杆双回线跨线接地故障的距离保护算法研究[J].中国电机工程学报,2013,33(7):131-138,9.LI Wei,BI Tianshu,XU Zhenyu,et al.First-zone distance relaying algorithm of parallel transmission lines for cross-country ground fault[J].Proceedings of the CSEE,2013,33(7):131-138,9.
[9]毕天姝,李伟,徐振宇,等.基于单端单回线电气量的同杆双回线单相接地距离保护[J].电力系统自动化,2013,37(7):88-92.BI Tianshu,LI Wei,XU Zhenyu,et al.Single-phase grounding distance protection of parallel transmission lines on same poles based on electric quantities data from single terminal and single line[J].Automation of Electric Power Systems,2013,37(7):88-92.
[10]宋国兵,刘志良,康小宁,等.一种同杆并架双回线接地距离保护方案[J].电力系统保护与控制,2010,38(12):102-106,114.SONG Guobing,LIU Zhiliang,KANG Xiaoning,et al.Ascheme for ground distance protection of parallel transmission lines[J].Power System Protection and Control,2010,38(12):102-106,114.
[11]朱声石.高压电网继电保护原理与技术[M].4版.北京:中国电力出版社,2014:235-239.
[12]李世龙,陈卫,邹耀,等.同杆并架线路阻抗比横联差动保护研究[J].电工技术学报,2016,31(21):21-29.LI Shilong,CHEN Wei,ZOU Yao,et al.Transverse differential protection based on the ratio of impedance for double circuit lines on the same tower[J].Transactions of China Electrotechnical Society,2016,31(21):21-29.
[13]梁振锋,康小宁,索南加乐,等.平行双回线路故障分量电流平衡保护研究[J].中国电机工程学报,2008,28(19):106-110.LIANG Zhenfeng,KANG Xiaoning,SUONAN Jiale,et al.Transverse differential protection based on fault superimposed components for double-circuit transmission lines[J].Proceedings of the CSEE,2008,28(19):106-110.
[14]解建宝,梁振锋,康小宁,等.平行双回线电流平衡保护的仿真研究[J].电网技术,2007,31(9):81-83.XIE Jianbao,LIANG Zhenfeng,KANG Xiaoning,et al.Simulation research on current balance protection for double-circuit transmission lines on the same tower[J].Power System Technology,2007,31(9):81-83.
[15]林达,王慧芳,王庆庆.带并联电抗器同杆双回线跨线故障性质判别方法[J].电网技术,2014,38(7):2001-2007.LIN Da,WANG Huifang,WANG Qingqing.A method to identify properties of cross-country faults occurred in common-tower double-circuit transmission line with shunt reactors[J].Power System Technology,2014,38(7):2001-2007.
[16]梁振锋,宋国兵,康小宁,等.数字化变电站同杆并架平行双回线路保护的研究[J].西安理工大学学报,2012,28(4):444-448.LIANG Zhenfeng,SONG Guobing,KANG Xiaoning,et al.Research on the protective relaying for double-circuit lines on the same tower in digital substation[J].Journal of Xi’an University of Technology,2012,28(4):444-448.
[17]杨奇逊,黄少锋.微型机继电保护基础[M].4版.北京:中国电力出版社,2013:83-89.
[18]张海,黄少锋.利用电压辅助电流选相的同杆双回线单端电气量选相原理[J].中国电机工程学报,2013,33(7):139-148,8.ZHANG Hai,HUANG Shaofeng.A fault phase selection scheme of currents with assistant voltages for commontower double-circuit transmission lines using one-terminal electrical quantities[J].Proceedings of the CSEE,2013,33(7):139-148,8.
[19]葛耀中.新型继电保护与故障测距原理与技术[M].2版.西安:西安交通大学出版社,2007:146-149.
[20]索南加乐.同杆双回线的故障分析及继电保护[D].西安:西安交通大学,1991.
[21]ZHANG Hai,SHENG Wanxing.A fault phase selection scheme based on ratio of opposite-direction-current to same-direction-current for parallel lines[C]//2014International Conference on Power System Tech,October20-22,2014,Chengdu,China:512-517.