基于改进Prim算法的分布式发电孤岛划分方法

Islanding Algorithm for Distributed Generators Based on Improved Prim Algorithm

分布式供电时,多用户孤岛运行模式可作为提高配电网供电可靠性的一种重要运行方式。根据配电网环网结构、开网运行的特点,提出了基于Prim算法的分布式孤岛划分方法。将孤岛划分问题转化为求取连通图的最小生成树。采用改进后的Prim算法对连通图进行搜索,以确定有效的孤岛范围。孤岛划分方法能适应配电网的环网结构,并保证重要负荷持续供电和孤岛范围最大,有利于故障恢复后孤岛模式与并网模式的快速转换。典型的孤岛划分实例分析结果表明,该算法可在配电网发生故障后,动态生成合理的孤岛划分方案。

Multi-consumer island operation can be used as an important operation mode to enhance power supply reliability of distribution network containing distributed generation （DG） while the power consumers are supplied by DG. According to the feature of distribution network that it possesses ring structure and operates in dendroid mode, a distributed islanding method based on Prim algorithm is proposed to change the islanding problem into minimum spanning tree to obtain connected graph. The connected graph is searched by improved Prim algorithm to determine effective range of island. The proposed islanding method can adapt to the ring structure of distribution network, and can ensure the contineous power supply to important consumers and maximize range of the island and is favorable to the fast swithing from island operation mode to network-connected operation mode after the fault recovery. Case analysis on typical islanding show that the proposed algorithm can dynamically generate rational islanding scheme after fault occurred in distribution network..