Resilience assessment of interdependent transportation and electric power systems in an earthquake emergency

Urban interdependent transport-electric power systems (ITEPS) play a critical role in modern societies, especially in an earthquake emergency. This study proposes a framework for assessing the resilience of ITEPS. Two interdependence mechanisms are captured including the signals of the electric power system (EPS) can affect the travel time of the transportation system (TS), and congestion in the TS affects the restoration process of the EPS. The network-based method is used to represent these two systems, where the TS uses combined trip distribution and assignment model, and the EPS uses the Direct Current (DC) power flow model. This study also proposes a functional assessment metric that includes emergency and regular needs of the two systems. The framework develops emergency response strategies to enhance the resilience of ITEPS, and considers the impact of different TS repair strategies. The proposed framework performs 500 Monte Carlo simulations to assess the resilience of both systems in a city in East China. The findings indicate that the interdependence improves TS’s functionality by 19% and repairs EPS 0.3 h earlier. Reasonable post-disaster repair orders and emergency response strategies can better regulate two types of traffic and facilitate the emergency power restoration process.