引用本文: | 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.[点击复制] |
XU Haiyang,HUANG Xinghua,WANG Ting,et al.Analysis of zero-sequence voltage compensation in double-circuit transmission system[J].Power System Protection and Control,2017,45(4):86-92[点击复制] |
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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。 |
关键词: 零序方向元件 零序电压补偿 同塔双回线 灵敏度 误动作 |
DOI:10.7667/PSPC160272 |
投稿时间:2016-03-04修订日期:2016-09-10 |
基金项目:国家电网公司科技项目“同塔多回输电线路纵向故障保护防误动研究” |
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Analysis of zero-sequence voltage compensation in double-circuit transmission system |
XU Haiyang,HUANG Xinghua,WANG Ting,SONG Guobing,FAN Zhanfeng |
(School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;XJ Group Corporation, Xuchang 461000, China) |
Abstract: |
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. |
Key words: zero-sequence directional component zero-sequence voltage compensation double-circuit transmission system sensitivity mal-operation |