Microgrids (MGs) could be subject to cascaded line failures due to their restricted power supply and power flow paths. This paper introduces a novel scheme for cascaded failure containment (CFC). CFC employs power flow and topology reconfiguration optimization in order to prevent the spreading of failure and enable the microgrid to sustain its operation. CFC first optimizes the power flow while considering frequency variation (OPF-freq). The optimization strives to prevent the propagation of the failure while maximizing the supported loads by the system. Then, CFC opts to increase the failure resiliency of the MG based on the OPF-freq solution through topology reconfiguration. The topology optimization is formulated as an integer linear program for minimizing the maximum line stability index. The formulation also takes into consideration the system’s operational constraints. Validation is carried out through the simulation of the IEEE 33 system as an islanded microgrid. Detailed illustrative examples and simulation results demonstrate the effectiveness of CFC and its superiority to competing approaches in the literature.

微电网（MG）可能会由于电源和功率流路径受限而遭受级联线路故障。本文介绍了一种新的级联故障遏制（CFC）方案。CFC采用潮流和拓扑重新配置优化，以防止故障扩散并使微电网能够维持其运行。CFC首先在考虑频率变化（OPF-freq）的同时优化功率流。该优化旨在在最大程度地支持系统负载的同时，防止故障的传播。然后，CFC选择基于OPF频率增加MG的故障恢复能力通过拓扑重新配置的解决方案。拓扑优化被公式化为整数线性程序，以最小化最大线路稳定性指标。该表述还考虑了系统的操作约束。通过将IEEE 33系统模拟为孤岛微电网来进行验证。详细的说明性示例和模拟结果证明了CFC的有效性及其相对于文献中竞争方法的优越性。