同塔双回线零序电压补偿分析
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摘要
零序电压补偿能够解决单回线系统中零序电压灵敏度不足的问题,但会对同塔双回线系统中健全线的零序方向元件造成不利的影响。通过对比分析不同连接方式下补偿前后健全线零序电压和电流的相位关系,得出了零序电压补偿对于健全线零序方向元件的影响。即单端电气连接且弱磁强电的情况下,原先判出反向故障的一侧零序方向元件会误判为正向故障;其他情况下,原先判出正向故障的一侧仍判为正向故障,原先判出反向故障的一侧不启动。PSCAD仿真结果验证了理论分析的正确性。
Zero-sequence voltage compensation can improve sensitivity of the zero-sequence voltage in single-circuit transmission systems while it has adverse effect on the zero-sequence directional component of the healthy line in double-circuit transmission systems. The effect is analyzed in different types of double-circuit transmission systems through comparing the relation of the zero-sequence voltage and current before and after voltage compensation. It is found that in the weak magnetic and strong current double-circuit transmission system with electricity connection on one side, the zero-sequence directional component will mal-operate on the side where opposite direction is identified before compensation. In the other situations, the zero-sequence directional component still recognizes forward direction on the side where forward direction is identified before compensation, while it will not operate on the side where opposite direction is identified before compensation. PSCAD simulation results verify the correctness of the theoretical analysis.
Zero-sequence voltage compensation can improve sensitivity of the zero-sequence voltage in single-circuit transmission systems while it has adverse effect on the zero-sequence directional component of the healthy line in double-circuit transmission systems. The effect is analyzed in different types of double-circuit transmission systems through comparing the relation of the zero-sequence voltage and current before and after voltage compensation. It is found that in the weak magnetic and strong current double-circuit transmission system with electricity connection on one side, the zero-sequence directional component will mal-operate on the side where opposite direction is identified before compensation. In the other situations, the zero-sequence directional component still recognizes forward direction on the side where forward direction is identified before compensation, while it will not operate on the side where opposite direction is identified before compensation. PSCAD simulation results verify the correctness of the theoretical analysis.
引文
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[19]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.
[2]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.
[3]张承学,丁书文.对新型正序故障分量方向元件几个特殊问题的探讨[J].继电器,1999,27(3):18-21.ZHANG Chengxue,DING Shuwen.Discussion to a few particular problems to new directional relay based on positive sequence fault components[J].Relay,1999,27(3):18-21.
[4]张弛,李一泉,曾耿晖.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):18-23,76.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):18-23,76.
[5]丁晓兵,赵曼勇,徐振宇.接地故障零序方向元件拒动保护改进方案[J].电力系统自动化,2006,30(9):88-90.DING Xiaobing,ZHAO Manyong,XU Zhenyu.Improvement on zero sequence current protection when directional element fails[J].Automation of Electric Power Systems,2006,30(9):88-90.
[6]李一泉,张弛,黄志元,等.基于正序电压替代的零序功率方向补充比相方案[J].电力系统自动化,2008,32(19):63-66,75.LI Yiquan,ZHANG Chi,HUANG Zhiyuan,et al.A new supplement scheme of zero sequence directional pilot relay based on positive voltage replacement[J].Automation of Electric Power Systems,2008,32(19):63-66,75.
[7]索南加乐,孟祥来,陈勇,等.基于故障类型的零序方向元件[J].中国电机工程学报,2007,27(1):25-30.SUONAN Jiale,MENG Xianglai,CHEN Yong,et al.A novel zero sequence directional element based on fault type[J].Proceedings of the CSEE,2007,27(1):25-30.
[8]索南加乐,杜斌,许立强,等.基于变压器中性点零序电流的方向元件[J].电力系统自动化,2009,33(15):72-77.SUONAN Jiale,DU Bin,XU Liqiang,et al.A novel direction element based on transformer neutral zero sequence current[J].Automation of Electric Power System,2009,33(15):72-77.
[9]阿里木江·卡德尔,索南加乐,阿米那古丽·艾尼,等.基于超高压自耦变压器中性点零序电流的方向比较纵联保护的研究[J].电力系统保护与控制,2014,42(22):24-31.ALIMJAN Kader,SUONAN Jiale,AMINGUL Aini,et al.A novel scheme for UHV auto-transformer protection based on zero-sequence current longitudinal comparison principle[J].Power System Protection and Control,2014,42(22):24-31.
[10]邰能灵,郭培育,于仲安,等.Π模型电容电流补偿的同塔四回线电流差动保护[J].电力系统保护与控制,2015,43(12):34-42.TAI Nengling,GUO Peiyu,YU Zhongan,et al.Current differential protection using capacitive current compensating algorithm on Pi-model for four-parallel lines on same towers[J].Power System Protection and Control,2015,43(12):34-42.
[11]JENA P,PRADHAN A K.An integrated relaying for directional relaying of the double-circuit line[J].IEEE Transactions on Power Delivery,2011,26(3):1783-1792.
[12]王海军,周全,梁远升,等.基于电压突变量的同塔双回直流输电线路故障选线方法[J].电力系统保护与控制,2015,43(7):23-29.WANG Haijun,ZHOU Quan,LIANG Yuansheng,et al.Fault line selection of double-circuit HVDC transmission line based on voltage variation[J].Power System Protection and Control,2015,43(7):23-29.
[13]邹浩,于仲安,吴彪,等.同塔四回输电线路双端故障测距实用算法[J].电力系统保护与控制,2016,44(13):111-116.ZOU Hao,YU Zhongan,WU Biao,et al.A new method of fault location with two-terminal data for four-parallel transmission lines on the same tower[J].Power System Protection and Control,2016,44(13):111-116.
[14]田书,刘芳芳,任晓明.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.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.
[15]宋国兵,徐海洋,樊占峰,等.利用相电流突变防止零序方向元件误动的方法[J].电力系统自动化,2016,40(2):114-120.SONG Guobing,XU Haiyang,FAN Zhanfeng,et al.A method for preventing mal-operation of zero-sequence direction component using current fault component[J].Automation of Electric Power Systems,2016,40(2):114-120.
[16]张思寒,董飞飞.220 k V同塔双回输电线路综合防雷措施效果研究[J].陕西电力,2015,43(4):66-69.ZHANG Sihan,DONG Feifei.Lightning protection effect research of 220 k V double-circuit transmission line[J].Shaanxi Electric Power,2015,43(4):66-69.
[17]张思寒.并联间隙配置方式对220 k V同塔双回输电线路防雷效果的研究[J].陕西电力,2015,43(1):82-85.ZHANG Sihan.Lightning protection effect research of parallel gap configuration option on 220 k V double circuit transmission line on same tower[J].Shaanxi Electric Power,2015,43(1):82-85.
[18]宋国兵,刘志良,粟小华,等.西北330 k V线路弱电强磁问题的分析及采取的措施[J].电力系统保护与控制,2010,38(20):121-125.SONG Guobing,LIU Zhiliang,SU Xiaohua,et al.Analysis on weak current and strong magnetic problem of north-west330 k V lines and its countermeasure[J].Power System Protection and Control,2010,38(20):121-125.
[19]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.