考虑负荷控制的有源配电网故障恢复策略

主动配电网的建设使得负荷控制成为电力系统日常调度手段之一。根据有源配电网的负荷灵活控制特性,提出了考虑负荷控制参与的有源配电网故障恢复策略。基于目前配电网仍存在大量手动开关的现状,故障发生时,由于开关操作时间较长,不利于迅速形成孤岛恢复失电负荷。首先利用自适应选择数学模型的负荷控制策略,快速切负荷形成孤岛,充分发挥DG的出力,保障重要负荷的不间断供电;然后对整个有源配电网重构优化,以网络损耗小、开关操作次数少为目标建立优化模型,采用环路编码策略,利用NSGA2算法进行求解。算例表明,所提出的策略能有效解决有源配电网故障恢复问题。

A Service Restoration Strategy Considering Influence of Load Management for Distribution System with DG

With construction of active distribution network, load control has become a general means for power system dispatch. Based on load control flexibility, a service restoration strategy for distribution system with distributed generation(DG) is proposed, which fully considers the influence of load control. When serious failures result in large area power blackout, it is difficult to ensure that DG switches to islanding operation mode without losing stability as a result of long operation time, given numerous manual switches in current distribution system. In order to maintain power supply of important load and make full use of renewable energy sources, proposed method switch DG to islanding operation mode first using load control with adaptively selecting mathematical model. Second, for the purpose of reducing active loss and number of switching operations, the NSGA2 algorithm is adopted to perform reconfiguration of distribution network to restore non-failure power blackout area using a loop encoding strategy. The proposed restoration method is exerted on a 33-node feeder. The simulation results demonstrate validity of proposed method.