Resilience Improvement of Active Distribution Network with Electric-Hydrogen Hybrid Energy Storage Microgrids under Ice Disaster

In order to enhance the resilience of distribution network under the ice disaster and improve its power supply capacity, a resilience improvement strategy is proposed based on the long-and-short-term mixed timescale rolling optimization for the new distribution system structure of distribution network with multi-microgrids. When distribution line trips in ice disaster, the distributed energy resources and the hydrogen-electric hybrid energy storage resources contained in the multi-microgrids can be used to supply electric power to the off-grid nodes urgently. The method also considers the economic benefits of the microgrids and the principle of its energy autonomy priority. At first, the probabilities based on the physical model of line icing are considered, and the distributed hydrogen energy storage is actively dispatched in the long duration, to provide the hydrogen energy storage guidance for day-ahead optimization. Then, in the short-term (day-ahead) optimization, a two-stage robust optimization model is constructed, where the battery energy storage is used to cope with the short-term uncertainty of renewable energy and the change of network topology. The model is solved by an extended column and constraint generation algorithm based on second-order cone constraints. Finally, an improved IEEE standard 33-node distribution network is simulated to verify the effectiveness and economy of the resilience improvement strategy.