Resilience assessment of the integrated gas and power systems under extreme weather

Abstract

With the deepening of the coupling between the power system and natural gas system (NGS), the integrated gas and power systems (IGPSs) have been an important infrastructure in the energy systems. On the one hand, the IGPSs improve the energy efficiency. On the other hand, the coupling structure makes the safe and reliable operation of the power system more threatened, especially under extreme events. As an important infrastructure, the IGPS often has large-scale power outage in meteorological disaster events, such as windstorm. Therefore, it is necessary to evaluate the resilience of the IGPS. A resilience assessment model is proposed to evaluate the resilience of IGPSs considering the cascading effects between the two systems under windstorms with low probability and high risk. Firstly, the failure model of components utilizing the fragility curve is represented. Then, an optimal power flow model is proposed to evaluate the resilience of the power system. Based on this, resilience indicators are proposed to quantify the damage caused by windstorms. The proposed methods have been proved to be effective in evaluating the resilience of the IPGS. Simulation results show that IPGS is less resilient than independent power systems due to cascading effects. The decrease of resilience intensifies with the increase of wind speeds, and the performance level of IGPS is 58% lower than that of IPS when the wind speed is 36 m/s.