摘要
针对分布式电源的接入使配电网中各个支路的电流流向及大小复杂化,对传统电流保护造成很大影响,分析了工频变化量距离保护在含DG典型配电网故障时的动作情况。结果表明,工频变化量距离保护方向性明确、动作快速,其可靠性、灵敏度等性能均优于配电网传统的距离保护和电流保护,适于35 kV及以下电压等级电网。分析了电动机馈送短路电流对工频变化量距离保护的影响,大型电动机与DG在配电网故障时表现相似,工频变化量距离保护同样可正确动作。
Distributed generators(DG)makes the direction and magnitude of branch current complicated in distribution network and results in influence on traditional current protection.This paper analyzes the action situation of power frequency variable distance protection(PFVDP) for fault of distribution network with DG.The result shows that PFVDP outperforms traditional distance and current protection in 35 kV network or below,which is mainly reflected in direction judgment,speed,reliability and sensitivity.At the same time,the impact of fault current fed by motors on PFVDP is also studied,which illustrates that those large motors act just like DG for fault of distribution network and PFVDP also operates correctly.
出处
《水电能源科学》
北大核心
2010年第7期146-149,共4页
Water Resources and Power
基金
上海市曙光计划基金资助项目(07SG11)
新世纪优秀人才支持计划基金资助项目(NCET-08-0356)
