1.Polytechnic Institute, Zhejiang University, Hangzhou310015, China;2.State Grid Jilin Electric Power Co., Ltd., Changchun130000, China

In recent years, extreme ice and snow disasters have led to frequent large-scale power outages in distribution networks, seriously endangering the safety of people’s heating and cooling. At present, the thermal-electric coupling in the integrated energy system is close, and how to improve the resilience of the power system through thermal energy when extreme ice and snow disasters occur is still unsolved. In order to improve the ability of integrated energy system to cope with extreme ice and snow disasters and fully exploit the thermal energy characteristics, firstly, the fault model of distribution network line under extreme ice and snow disasters is proposed. Secondly, combined with the transmission delay characteristic of heat network and the thermal inertia of heat load, a model of integrated energy systems is established. Then, based on the two-stage distributed robust optimization model, a strategy for enhancing the resilience of integrated energy systems is proposed, which uses the thermal inertia of buildings to store thermal energy and allocates thermal storage capacity before disaster as well as closes the interconnection switches and optimizes fault repair after disasters. Finally, a case of thermal-electric coupling is set up for simulation verification. The results show that the resilience enhancement strategy can fully tap the thermal energy potential, balance the economy and robustness, and realize the resilience enhancement of the integrated energy system.