线路纵联零序方向保护误动机理分析及对策研究
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摘要
针对纵联零序方向保护克服零序电压死区导致过补偿的问题,提出一种改进的零序电压的补偿方法。该方案通过补偿线路全长的三分之一来实现,保证纵联零序方向不会两侧同时出现过补偿误动,同时保证内部故障时,保护具备一定的灵敏度。首先对纵联保护零序方向补偿进行分析,提出造成零序方向补偿误动的新零点。提出一种改进型零序补偿方案,同时以负序方向为辅助判据,改进纵联零序方向保护的性能。仿真试验结果证明了该方案的可行性和正确性。
In order to solve the overcompensation problem caused by the zero sequence directional pilot protection which is designed to overcome the zero voltage dead zone, an improved zero sequence voltage compensation scheme is proposed, which is realized by compensating one third of the line length. In this way, the both sides simultaneous misoperation caused by overcompensation is prevented. At the same time, the sensitivity is ensured under the situation of internal fault. First of all, the analysis of compensation of the zero sequence directional protection is carried on, the new zero point is raised, and furthermore an improved zero sequence compensation scheme is put forward, whose auxiliary criterion is negative sequence, leading to an improved function of zero sequence directional pilot protection. The simulation result verifies the feasibility and correctness of the scheme.
In order to solve the overcompensation problem caused by the zero sequence directional pilot protection which is designed to overcome the zero voltage dead zone, an improved zero sequence voltage compensation scheme is proposed, which is realized by compensating one third of the line length. In this way, the both sides simultaneous misoperation caused by overcompensation is prevented. At the same time, the sensitivity is ensured under the situation of internal fault. First of all, the analysis of compensation of the zero sequence directional protection is carried on, the new zero point is raised, and furthermore an improved zero sequence compensation scheme is put forward, whose auxiliary criterion is negative sequence, leading to an improved function of zero sequence directional pilot protection. The simulation result verifies the feasibility and correctness of the scheme.
引文
[1]曾耿晖,黄明辉,刘之尧,等.同杆线路纵联零序保护误动分析及措施[J].电力系统自动化,2006,30(20):103-107.ZENG Genghui,HUANG Minghui,LIU Zhiyao,et al.Analysis and countermeasures of misoperation of zero sequence pilot protection on circuit lines of same pole[J].Automation of Electric Power Systems,2006,30(20):103-107.
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[4]李一泉,焦邵麟,张弛,等.平行线路纵联零序方向保护安全性分析[J].电力系统自动化,2008,32(6):104-107.LI Yiquan,JIAO Shaolin,ZHANG Chi,et al.Safety analysis on pilot zero sequence direction relay applied in parallel lines[J].Automation of Electric Power Systems,2008,32(6):104-107.
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[6]张苏敏,古斌,曹良丰,等.输电线路相差保护新原理[J].电力系统保护与控制,2015,43(2):76-83.ZHANG Sumin,GU Bin,CAO Liangfeng,et al.A novel phase comparison protection principle for transmission lines[J].Power System Protection and Control,2015,43(2):76-83.
[7]李瑞生.一种基于虚拟节点网络拓朴结构适用于架空线路主动配电网的纵联保护方案[J].电力系统保护与控制,2015,43(2):70-75.LI Ruisheng.An aerial line active distribution network pilot protection scheme based on topology of virtual node[J].Power System Protection and Control,2015,43(2):70-75.
[8]申志成,张慧媛,龚仁敏,等.反应全类型故障的改进零序方向元件[J].电力系统保护与控制,2015,43(20):102-106.SHEN Zhicheng,ZHANG Huiyuan,GONG Renmin,et al.An improved zero-sequence directional component to response all kinds of fault[J].Power System Protection and Control,2015,43(20):102-106.
[9]樊占峰,叶东印,李瑞生,等.平行线弱电强磁模型下零序方向元件改进[J].电力系统自动化,2008,32(17):100-103.FAN Zhanfeng,YE Dongyin,LI Ruisheng,et al.Improvement of zero-sequence directional relay for the parallel line with magnetically strong and electrically weak connection[J].Automation of Electric Power Systems,2008,32(17):100-103.
[10]田书,刘芳芳,任晓明,等.基于暂态量的同塔双回线路故障选相研究[J].电力系统保护与控制,2015,43(1):50-54.TIAN Shu,LIU Fangfang,REN Xiaoming,et al.Research on transient-based faulty phase selection for double-circuit lines on the same tower[J].Power System Protection and Control,2015,43(1):50-54.
[11]吴麟琳,黄少锋.零序互感对相邻线路纵联零序方向保护的影响[J].电力系统保护与控制,2011,39(3):24-28.WU Linlin,HUANG Shaofeng.Effects of zero-sequence mutual inductance on zero-sequence pilot protection of parallel lines[J].Power System Protection and Control,2011,39(3):24-28.
[12]李振动,赵青春,董杰,等.串联补偿对差动保护的影响分析[J].电力系统保护与控制,2015,43(10):139-143.LI Zhendong,ZHAO Qingchun,DONG Jie,et al.Research on influence of series compensation on differential protection[J].Power System Protection and Control,2015,43(10):139-143.
[13]蒋苏静,毕天姝,徐振宇,等.平行双回线路纵联零序方向误动原因分析及负序功率方向研究[J].电力系统保护与控制,2009,37(24):21-26.JIANG Sujing,BI Tianshu,XU Zhenyu,et al.Analysis of the reason of pilot zero sequence directional protection mal-function and study of negative sequence directional element on parallel double-circuit lines[J].Power System Protection and Control,2009,37(24):21-26.
[14]张弛,李一泉,曾耿辉.基于负序分量补偿的纵联零序方向保护判据与仿真研究[J].电力系统保护与控制,2008,36(21):18-23.ZHANG Chi,LI Yiquan,ZENG Genghui.Principle investigation and simulation research on pilot zero sequence directional protection with compensation of negative sequence component[J].Power System Protection and Control,2008,36(21):18-23.
[15]徐振宇,杜兆强,孟岩,等.零、负序方向元件的特殊问题研究[J].电力自动化设备,2008,28(5):21-25.XU Zhenyu,DU Zhaoqiang,MENG Yan,et al.Special problems in zero/negative sequence directional element[J].Electric Power Automation Equipment,2008,28(5):21-25.
[2]汪萍,陈久林.纵联零序方向保护误动原因分析及其对策[J].电力自动化设备,2007,27(7):122-125.WANG Ping,CHEN Jiulin.Analysis of longitudinal zero sequence direction protection misoperation and its countermeasures[J].Electric Power Automation Equipment,2007,27(7):122-125.
[3]李钢,路洁,白晶,等.一起平行运行线路纵联零序方向保护误动分析[J].电力系统自动化,2008,32(14):104-107.LI Gang,LU Jie,BAI Jing,et al.Mal-function analysis on pilot zero sequence direction relay applied in parallel lines[J].Automation of Electric Power Systems,2008,32(14):104-107.
[4]李一泉,焦邵麟,张弛,等.平行线路纵联零序方向保护安全性分析[J].电力系统自动化,2008,32(6):104-107.LI Yiquan,JIAO Shaolin,ZHANG Chi,et al.Safety analysis on pilot zero sequence direction relay applied in parallel lines[J].Automation of Electric Power Systems,2008,32(6):104-107.
[5]郭润生,何彩红,郅建杰.相邻线路零序互感对线路零序纵联方向保护的影响[J].继电器,2004,32(9):71-73.GUO Runsheng,HE Caihong,ZHI Jianjie.Influence of zero-sequence mutual inductance to pilot protection in parallel lines[J].Relay,2004,32(9):71-73.
[6]张苏敏,古斌,曹良丰,等.输电线路相差保护新原理[J].电力系统保护与控制,2015,43(2):76-83.ZHANG Sumin,GU Bin,CAO Liangfeng,et al.A novel phase comparison protection principle for transmission lines[J].Power System Protection and Control,2015,43(2):76-83.
[7]李瑞生.一种基于虚拟节点网络拓朴结构适用于架空线路主动配电网的纵联保护方案[J].电力系统保护与控制,2015,43(2):70-75.LI Ruisheng.An aerial line active distribution network pilot protection scheme based on topology of virtual node[J].Power System Protection and Control,2015,43(2):70-75.
[8]申志成,张慧媛,龚仁敏,等.反应全类型故障的改进零序方向元件[J].电力系统保护与控制,2015,43(20):102-106.SHEN Zhicheng,ZHANG Huiyuan,GONG Renmin,et al.An improved zero-sequence directional component to response all kinds of fault[J].Power System Protection and Control,2015,43(20):102-106.
[9]樊占峰,叶东印,李瑞生,等.平行线弱电强磁模型下零序方向元件改进[J].电力系统自动化,2008,32(17):100-103.FAN Zhanfeng,YE Dongyin,LI Ruisheng,et al.Improvement of zero-sequence directional relay for the parallel line with magnetically strong and electrically weak connection[J].Automation of Electric Power Systems,2008,32(17):100-103.
[10]田书,刘芳芳,任晓明,等.基于暂态量的同塔双回线路故障选相研究[J].电力系统保护与控制,2015,43(1):50-54.TIAN Shu,LIU Fangfang,REN Xiaoming,et al.Research on transient-based faulty phase selection for double-circuit lines on the same tower[J].Power System Protection and Control,2015,43(1):50-54.
[11]吴麟琳,黄少锋.零序互感对相邻线路纵联零序方向保护的影响[J].电力系统保护与控制,2011,39(3):24-28.WU Linlin,HUANG Shaofeng.Effects of zero-sequence mutual inductance on zero-sequence pilot protection of parallel lines[J].Power System Protection and Control,2011,39(3):24-28.
[12]李振动,赵青春,董杰,等.串联补偿对差动保护的影响分析[J].电力系统保护与控制,2015,43(10):139-143.LI Zhendong,ZHAO Qingchun,DONG Jie,et al.Research on influence of series compensation on differential protection[J].Power System Protection and Control,2015,43(10):139-143.
[13]蒋苏静,毕天姝,徐振宇,等.平行双回线路纵联零序方向误动原因分析及负序功率方向研究[J].电力系统保护与控制,2009,37(24):21-26.JIANG Sujing,BI Tianshu,XU Zhenyu,et al.Analysis of the reason of pilot zero sequence directional protection mal-function and study of negative sequence directional element on parallel double-circuit lines[J].Power System Protection and Control,2009,37(24):21-26.
[14]张弛,李一泉,曾耿辉.基于负序分量补偿的纵联零序方向保护判据与仿真研究[J].电力系统保护与控制,2008,36(21):18-23.ZHANG Chi,LI Yiquan,ZENG Genghui.Principle investigation and simulation research on pilot zero sequence directional protection with compensation of negative sequence component[J].Power System Protection and Control,2008,36(21):18-23.
[15]徐振宇,杜兆强,孟岩,等.零、负序方向元件的特殊问题研究[J].电力自动化设备,2008,28(5):21-25.XU Zhenyu,DU Zhaoqiang,MENG Yan,et al.Special problems in zero/negative sequence directional element[J].Electric Power Automation Equipment,2008,28(5):21-25.