极端天气下配电网故障多时段恢复韧性提升策略

Multi⁃period recovery strategy for improving distribution network resilience during extreme weather conditions

网络重构和孤岛划分是极端天气下含分布式电源配电网故障恢复的重要手段。按照气象灾害发展过程采取多时段的故障恢复有利于提升配电网韧性。现有故障恢复策略缺乏考虑多次网络重构和孤岛划分的操作成本以及孤岛内分布式电源出力的波动性,导致优化结果安全和经济效果欠佳。因此,本文提出了极端天气下配电网故障多时段恢复策略,通过构建含分布式电源的主动配电网重构与孤岛划分统一模型,并考虑不同故障原因下的恢复时间尺度,细分时间断面,实现故障期间动态调整配电网网络结构,提升电网韧性。最后在IEEE 33节点系统中对所提策略进行验证,算例测试结果表明:所提策略开关动作次数少,负荷动态恢复率高,具备一定的抵御功率扰动能力,能提高极端天气下配电网的韧性。

In extreme weather conditions,network reconfiguration and island partition are important means for fault recovery of distribution networks with distributed generations.According to the development process of meteorologi⁃cal disasters,the multi⁃period fault recovery strategy is conducive to improving the resilience of distribution net⁃work.The existing fault recovery strategies do not consider the operation cost of multiple network reconfigurations and island partitions,as well as the fluctuation of distributed power supply in the island,resulting in poor security and economic results of the optimization results.Therefore,this paper proposed a multi⁃period recovery strategy for improving distribution network resilience during extreme weather conditions.By constructing a unified model of ac⁃tive distribution network reconfiguration and island partition,considering the recovery time scale under different fault causes,and subdividing the time section,the strategy can realize the dynamic adjustment of distribution net⁃work structure during the fault duration,and improve the resilience of the power grid.Finally,the proposed strate⁃gy is verified in the IEEE 33-bus system.The case shows that the proposed strategy has fewer switching operations and higher load recovery rate;and it can resist power disturbances within a certain range,which can improve the resilience of the distribution network in extreme weather conditions.