Resilience Assessment and Improvement of Active Distribution Networks Considering Soft Open Point

The distribution network is the “last mile” of power supply. Its power supply recovery speed and the ratio of the recovery load affect the resilience of the power system. Therefore, it is particularly important to improve the power supply recovery capability of the distribution network under extreme natural disasters. The soft open point (SOP) is a fully-controlled power electronic device, which has the advantages of continuous power regulation and reactive voltage support, and will be widely used in the normal operation and power supply recovery of the distribution system. Firstly, the load recovery model of the active distribution network is established by considering the power supply recovery of the load through the controllable distributed generations and SOP after the fault. Secondly, the resilience assessment process that embeds the load recovery model into the sequential Monte Carlo simulation process is proposed. Finally, the proposed algorithm was applied to the modified IEEE-33 bus system to verify its correctness and effectiveness. We got the differences between SOP and other recovery measures, and the improvement of the distribution network resilience under the combined action of SOP and controllable distributed power generation is analyzed.