摘要:
Multiple faults may occur in the distribution network under ice storm. In order to reduce the damage caused by ice storm on the distribution network, a multi-phased fault repair and melting ice model containing distributed generators (DGs) under ice storm was proposed in this paper, according to the impacts of different ice storm periods on different regions of the distribution network. In this model, the DGs were used to supply power for the important lost load, and the fault repair and melting ice process was divided into three stages. In the early fault repair and post-repair periods, the ice thickness of lines was the goal, and the line important metrics was introduced to obtain the ice melting sequences. In the medium repair period, taken the minimum of allocate fitness as the goal, the optimal resource allocation strategy and emergency repair mask were obtained by defining emergency resources vector and fault demand vector. On this basis, the least integrated financial loss was taken as the objective, and the discrete bacterial colony chemotaxis (DBCC) optimization algorithm was used to solve the optimal "melting ice+repair" program. An improved PG&E 69-bus system simulation has verified the feasibility and effectiveness of the proposed strategy.%当冰灾下配电网出现覆冰并引发多故障时,为了减小冰灾对配电网造成的危害,根据冰灾不同时期对配电网不同区域造成的影响不同,建立冰灾下含分布式电源(DG)的配电网多故障分阶段融冰抢修模型.该模型首先利用DG恢复重要负荷的供电,并将冰灾下配电网多故障融冰抢修过程分为三个阶段.在抢修初期和抢修后期,以线路覆冰厚度为目标,并引入线路重要度指标,得到融冰顺序;在抢修中期,通过定义应急资源向量和故障需求向量,以分配适应度最小为目标,得到应急资源和抢修任务的最优分配策略.在此基础上,以综合经济损失最小为目标,并采用离散细菌群体趋药性(DBCC)算法优化求解得到最优"融冰+抢修"方案.最后以改进的PG&E 69节点系统为例进行仿真,证明了所提策略的可行性和有效性.