冰灾下线路断线严重影响配电网安全运行，含分布式资源的微电网接入后为提升配电网韧性提供了新手段。针对冰灾下微电网资源的合理利用，本文提出了一种微电网协同配电网的韧性提升策略，充分发挥微电网分布式电源及储能的紧急供电能力。首先，考虑线路覆冰灾害故障演化特性，构建配电网线路覆冰风险量化模型。其次，提出基于长-短周期混合时间尺度滚动的优化方法，长周期优化聚焦跨日时间尺度微电网储能预调度与配电线路修复策略；短周期日前优化应对新能源及冰灾故障演化下网络拓扑变化的日间不确定性，采用列与约束生成算法生成调度策略；长-短周期优化模型在灾害全周期内滚动进行。最终，采用改进IEEE标准33节点配电网对所提韧性提升策略的有效性进行仿真验证。

The severe impact of extreme natural disasters, such as line icing, significantly affects the safety of distribution network. The advent of microgrid with energy storage provides a new method to enhance the resilience of the system. This paper proposes a cooperative optimization strategy for the operation of microgrids and distribution network, leveraging the emergency power supply capabilities of distributed energy sources and storage to enhance the resilience of the distribution network and microgrids cluster system. Firstly, considering the evolving characteristics of line icing disaster, a quantitative model for assessing the risk of line fault in the distribution network is established. Secondly, a coordinated mixed timescale rolling-horizon optimization method is proposed, the long-term optimization focuses on microgrids energy storage prescheduling and distribution network line repair strategies at the inter-day time scale. The short-term day-ahead optimization mainly addresses the intra-day uncertainty of new energy sources and the network topology changes under line fault evolution. The strategy is solved using a column and constraint generation algorithm. The long-and-short-term optimization is rolled out throughout the whole ice disaster. The proposed strategy is simulated and validated using an improved IEEE standard 33-node distribution network. Simulation analysis indicates that the proposed method effectively enhances the resilience of the distribution network and microgrids system.