基于保护动作信号的配电网区域保护方案

摘要

Since the local protection may improperly operate due to the multiple DGs(Distributed Generators) and branches,a regional protection scheme of distribution network based on the logical information is proposed.Firstly,the problems of local protection caused by multiple DGs and branches are analyzed,base on which,the protection areas are divided based on breaker configuration.Secondly,the operation criterion of regional protection is consti-tuted by the combination of the start-up information of the section Ⅰ,Ⅱ and Ⅲ of the existing over-current protection.The case study of IEEE 33-bus distribution system shows that the proposed scheme can accurately locate the internal fault,block the protection during the external fault,accelerate the protection operation and shorten the power outage time.The proposed criterion is constituted by redundant information,it has strong fault-tolerant ability,and requires less transinformation and lower information synchronization.%针对多分布式电源和多分支引起本地保护不正确动作的情况,提出一种基于逻辑量信息的配电网区域保护方案.首先分析多分布式电源和多分支线路下本地保护存在的问题,在此基础上,根据断路器配置情况划分保护区域.然后融合现有阶段式过流保护Ⅰ段、Ⅱ段和Ⅲ段启动信息构成区域保护动作判据.IEEE 33节点配电系统算例验证了所提方案能够准确定位区内故障、闭锁区外故障,加速保护动作、缩短故障停电时间.判据以多信息构成冗余,具有较强的容错能力,信息传输量少,对同步性要求低.