Coordinated Expansion Planning for the Electricity‐Gas Integrated Energy System Considering N‐1 Security Constraints and Restorability Capacity

Under the influence of extreme natural disasters and man‐made cyber attacks, the electricity‐gas integrated energy system (EGIES) may experience power failure and gas interruption, which have significant impacts on the national economy and social stability. This paper proposes an expansion planning strategy for the EGIES considering N‐1 security constraints and restorability capacity. First, the basic expansion planning model for the EGIES, the sub‐model of the N‐1 security check, and the sub‐model of restorability capacity verification are respectively proposed. Then, the iterative solution strategy is proposed, in which the solutions of the basic planning model are delivered to the sub‐models and the feasible cutting constraints generated by solving the sub‐models are delivered to the planning model. Finally, the simulation results of the 9‐bus power system with an 8‐node gas system and the IEEE 39‐bus power system with a 20‐node gas system show the effectiveness of the proposed planning method in enhancing the resilience of the EGIES's planning scheme.