含分布式电源的配电网启发式孤岛划分方法∗

摘要

分布式电源接入配电网后，孤岛运行可以作为一种新的故障恢复方式，保障重要负荷的供电。本文提出了一种基于距离权重搜索孤岛的启发式孤岛划分方法，以恢复的重要负荷最多为主要目标，充分考虑孤岛安全运行的约束条件，计及不可控负荷的影响，引入距离权重来表征负荷与当前孤岛的距离远近，决定负荷并入孤岛的先后顺序。在先形成仅含分布式电源和相连支路的初始孤岛后，按负荷重要程度，依次并入距离当前孤岛最近的负荷，最后对划分好的孤岛进行安全校验和优化。仿真结果表明了该方法能在配电网发生故障后，动态划分合理的孤岛范围。%With plenty of distributed generators connected to distribution system,island operation can be used as a new fault recovery approach to ensure the power supply of critical loads.A heuristic islanding algorithm based on dis-tance-weight was proposed,taking the maximum recovered critical load as the main target,considering the pact of va-rious operation constraints and uncontrolled loads of the distribution networks,introducing distance-weight which re-presents the distance between the objective load and the island to find out which load is the nearest to the current is-land and should be recovered first.The initial island is composed of all the DGs and some branches between them,and then enlarged by merging the nearest load among all the considered loads.Finally,it will get security assessment and be regulated.Simulation results have demonstrated that the proposed algorithm can generate a reasonable islanding scheme after a fault occurs.