Two-stage resilience enhancement method for integrated electricity-gas systems through linepack and mobile compressors

Extreme weather events pose significant threats to the Integrated Electricity-Gas Systems (IEGS), often resulting in catastrophic faults of critical components and subsequent disruptions in energy supply. This paper proposes a novel two-stage resilience enhancement method that systematically coordinates the distinct operational characteristics and complementary resilience resources of Power Distribution Systems (PDS) and Natural Gas Systems (NGS). In the pre-disaster stage, comprehensive optimization of mobile compressors, linepack capacity, and PDS topology is performed to maximize the potential for system resilience recovery. In the post-disaster stage, considering the cascading fault propagation characteristics and linepack flow dynamics, the mobile compressors are dispatched to flexibly establish gas transmission links between linepack /gas wells and isolated gas network islands, thereby facilitating the recovery of the IEGS. The proposed method is reformulated into a mixed-integer second-order cone programming model using second-order cone relaxation. The progressive hedging algorithm is employed to further improve the solution efficiency. The proposed method is validated on an IEGS with a 33-bus PDS and a 20-node NGS. Results show that the proposed method provides a robust solution for improving IEGS resilience, offering significant advancements in coordinated electricity-gas system operation during extreme weather events.