Resilience assessment of electric-thermal energy networks considering cascading failure under ice disasters

The frequent occurrence of ice disasters, such as blizzards and freezing rain, poses significant challenges to the safe operation of electric-thermal energy networks. This paper proposes a resilience assessment method for electric-thermal energy networks that accounts for fault propagation. Initially, a line fragility model is established considering icing failures and overload failures under ice disasters. Integrating the fault propagation mechanism, a cascading failure graph of electric-thermal energy networks is proposed, grounded in complex network theory. Furthermore, a resilience index scheme encompassing both component and system levels is constructed. To address the impact of cascading failures on electric-thermal energy networks amid prolonged ice disasters, a strengthened distributionally robust resilience assessment numerical model is formulated, taking into account the uncertainty of wind power. Different scale test systems and an actual energy networks are conducted to validate the scalability and the practicality of the propose method, accurately identifying critical vulnerabilities and quantifying the resilience of electric-thermal energy networks.