Reinforcement-Based Resilience Enhancement Method for Integrated Electricity-Gas System Considering Deliberate Physical Attacks

The integrated electricity-gas system is particularly susceptible to large-scale power outages and significant gas supply disruptions when targeted by deliberate physical attacks. Developing pre-event hardening strategy for the integrated electricity-gas system is crucial for strengthening its overall resilience against deliberate attacks, ensuring the reliable operation of the system. Initially, this paper addresses the differences in energy grade and proposes a method for assessing resilience metrics specific to the integrated electricity-gas system. Subsequently, fully considering the differences in attack difficulty and effectiveness across different energy systems, a trilevel, two-stage pre-event line hardening optimization model based on a master-slave game is established. To solve this proposed model, the Column-and-Constraint Generation algorithm is employed finally. A case study is conducted to verify the effectiveness of the strategy, demonstrating its potential in enhancing system resilience.