Resilience Assessment and Enhancement of City-Level Integrated Energy Systems Based on Multi-energy Collaborative Regulation

With the deepening of the coupling degree of the energy system, the threat of extreme events to the city-level integrated energy system is becoming increasingly significant. This paper proposes a resilience assessment and improvement method for city-level electricity-gas-heat-storage multi-energy systems. By constructing a phased resilience index system, introducing quantitative models of thermal inertia and heat storage capacity, and designing a unified conversion coefficient for multi-energy loads, the deficiencies of existing methods in dynamic process characterization, multi-energy coupling evaluation, and scenario universality have been addressed. Combining extreme disaster scenarios, a two-stage fritters optimization model is adopted to optimize the pre-disaster heat storage and post-disaster emergency repair strategies. The experimental results show that the proposed method enhances the system resilience by 9.07%, verifying its effectiveness and robustness under extreme events.