基于断线识别的同塔双回线零序纵联保护防误动方案
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摘要
为了解决同塔双回线一回断线时健全线零序方向纵联保护误动的问题,提出了基于断线识别的零序纵联保护防误动策略。首先分析了同塔双回线一回断线期间健全线路零序纵联保护的误动机理,进一步提出了同塔双回线断线识别判据,利用健全线路故障前负荷电流和故障后零序电流的幅值及相位特征,区分邻线断线故障和本线接地故障。基于此,构造了零序纵联保护防误动逻辑,当邻线发生断线故障后,会自动闭锁本线两端零序电压补偿策略,从而能够有效防止零序纵联保护误动。最后通过数字仿真验证了所提出方法的有效性和可行性。
To solve the maloperation problem of zero-sequence pilot protection on the healthy line of parallel circuits onthe same tower in the case of a broken line on the other circuit,a maloperation prevention strategy for zero-sequence pilotprotection is proposed based on broken-line identification. First,the maloperation mechanism of zero-sequence pilot pro-tection on the healthy line is analyzed when a broken-line fault occurs on the other circuit. Then,the broken-line identifi-cation criterion for parallel circuits on the same tower is proposed,which uses the amplitude and phase characteristics ofload current before fault and zero-sequence current after fault on the healthy line to distinguish the broken-line fault onthe adjacent line from the earth fault on the protected line. On this basis,the maloperation prevention logic of zero-se-quence pilot protection is constructed:if a broken-line fault occurs on the adjacent line,the zero-sequence voltage com-pensation strategy will be closed at the two ends of this protected line,preventing the maloperation of zero-sequence pilotprotection effectively. Finally,digital simulations verify the effectiveness and feasibility of the proposed method.
To solve the maloperation problem of zero-sequence pilot protection on the healthy line of parallel circuits onthe same tower in the case of a broken line on the other circuit,a maloperation prevention strategy for zero-sequence pilotprotection is proposed based on broken-line identification. First,the maloperation mechanism of zero-sequence pilot pro-tection on the healthy line is analyzed when a broken-line fault occurs on the other circuit. Then,the broken-line identifi-cation criterion for parallel circuits on the same tower is proposed,which uses the amplitude and phase characteristics ofload current before fault and zero-sequence current after fault on the healthy line to distinguish the broken-line fault onthe adjacent line from the earth fault on the protected line. On this basis,the maloperation prevention logic of zero-se-quence pilot protection is constructed:if a broken-line fault occurs on the adjacent line,the zero-sequence voltage com-pensation strategy will be closed at the two ends of this protected line,preventing the maloperation of zero-sequence pilotprotection effectively. Finally,digital simulations verify the effectiveness and feasibility of the proposed method.
引文
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[10]张琦兵(Zhang Qibing).平行线弱电强磁下零序方向元件的改进(Improvement of zero-sequence directional com-ponent for parallel lines with magnetically strong and elec-trically weak connection)[J].电力系统自动化(Automa-tion of Electric Power Systems),2013,37(7):94-98.
[11]宋国兵,徐海洋,樊占峰,等(Song Guobing,Xu Haiyang,Fan Zhanfeng,et al).利用相电流突变防止零序方向元件误动的方法(A method for preventing mal-operation ofzero-sequence direction component using current faultcomponent)[J].电力系统自动化(Automation of ElectricPower Systems),2016,40(2):114-120.
[12]徐海洋,宋国兵,樊占峰,等(Xu Haiyang,Song Guobing,Fan Zhanfeng,et al).适用于弱馈系统的零序方向元件防误动方法(A novel method adapted to weak-infeed sys-tem for preventing mal-operation of the zero-sequence di-rection component)[J].电网技术(Power System Technol-ogy),2015,39(10):2952-2958.
[13] Jiang Xianguo,Du Dingxiang,Wang Xingguo,et al. Mal-operation prevention study of zero sequence direction pro-tection to broken-line faults of parallel circuits on sametower[C]//5th IEEE International Conference on ElectricUtility Deregulation,Restructuring and Power Technolo-gies. Changsha,China,2015:1115-1119.
[2]张弛,李一泉,曾耿晖(Zhang Chi,Li Yiquan,Zeng Geng-hui).基于负序分量补偿的纵联零序方向保护判据与仿真研究(Principle investigation and simulation re-search on pilot zero sequence directional protection withcompensation of negative sequence component)[J].电力系统保护与控制(Power System Protection and Control),2008,36(21):18-23,76.
[3]吴麟琳,黄少锋(Wu Linlin,Huang Shaofeng).零序互感对相邻线路纵联零序方向保护的影响(Effects of zero-sequence mutual inductance on zero-sequence pilot pro-tection of parallel lines)[J].电力系统保护与控制(PowerSystem Protection and Control),2011,39(3):24-28.
[4]赖庆辉,陈福锋,许庆强,等(Lai Qinghui,Chen Fufeng,Xu Qingqiang,et al).纵联零序方向元件的特殊问题分析及解决方案(Analysis of pilot zero-sequence direction-al protection special problems and solutions)[J].电力自动化设备(Electric Power Automation Equipment),2010,30(12):88-91.
[5]杜丁香,周泽昕,李岩军,等(Du Dingxiang,Zhou Zexin,Li Yanjun,et al). 1 000 kV交流同塔双回输电线路的电气特性仿真分析(Simulation analysis on electrical char-acteristics of 1 000 kV AC double-circuit transmissionlines on the same tower)[J].电网技术(Power System Technology),2011,35(3):20-25.
[6]朱声石.高压电网继电保护原理与技术[M].北京:中国电力出版社,2005.
[7]葛耀中.新型继电保护和故障测距的原理与技术[M].西安:西安交通大学出版社,2007.
[8]周春霞,余越,赵寒,等(Zhou Chunxia,Yu Yue,ZhaoHan,et al).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(Influence of zero-se-quence current compensation coefficient setting on earth-fault distance protection for double-circuit UHVAC trans-mission lines on the same tower)[J].电网技术(PowerSystem Technology),2012,36(12):106-111.
[9]刘家军,闫泊,姚李孝,等(Liu Jiajun,Yan Bo,Yao Lixi-ao,et al).平行双回线中串补电容对零序电抗型距离保护的影响(Influence of series compensation capacitor onzero-sequence reactance-type distance protection in paral-lel double-circuit lines)[J].电工技术学报(Transactionsof China Electrotechnical Society),2011,26(7):264-270,255.
[10]张琦兵(Zhang Qibing).平行线弱电强磁下零序方向元件的改进(Improvement of zero-sequence directional com-ponent for parallel lines with magnetically strong and elec-trically weak connection)[J].电力系统自动化(Automa-tion of Electric Power Systems),2013,37(7):94-98.
[11]宋国兵,徐海洋,樊占峰,等(Song Guobing,Xu Haiyang,Fan Zhanfeng,et al).利用相电流突变防止零序方向元件误动的方法(A method for preventing mal-operation ofzero-sequence direction component using current faultcomponent)[J].电力系统自动化(Automation of ElectricPower Systems),2016,40(2):114-120.
[12]徐海洋,宋国兵,樊占峰,等(Xu Haiyang,Song Guobing,Fan Zhanfeng,et al).适用于弱馈系统的零序方向元件防误动方法(A novel method adapted to weak-infeed sys-tem for preventing mal-operation of the zero-sequence di-rection component)[J].电网技术(Power System Technol-ogy),2015,39(10):2952-2958.
[13] Jiang Xianguo,Du Dingxiang,Wang Xingguo,et al. Mal-operation prevention study of zero sequence direction pro-tection to broken-line faults of parallel circuits on sametower[C]//5th IEEE International Conference on ElectricUtility Deregulation,Restructuring and Power Technolo-gies. Changsha,China,2015:1115-1119.