Flexibility-supported optimal scheduling for integrated energy systems under extreme typhoon disasters

The frequent occurrence of extreme disasters poses significant threats to the integrated energy system. However, existing scheduling strategies struggle to exploit the flexibility potential of gas and thermal inertia in integrated energy systems to cope with the uncertainties caused by extreme weather. Therefore, this paper proposes a two-stage flexibility-supported scheduling strategy for integrated energy systems under typhoon disasters. Firstly, a dynamic model of the integrated energy system is established and comprehensive disaster scenarios for the integrated energy system are developed. Secondly, vulnerable components in the integrated energy system are identified from the dimensions of vulnerable periods and weak branches, and a pre-disaster preventive scheduling strategy is proposed based on flexibility resource output adjustment and power flow redistribution. Finally, considering the flexible support provided by the inertia of gas and heat pipelines and the regulation potential of multi-energy loads, an emergency rolling scheduling strategy is proposed based on real-time prediction information. Through power flow adjustment, proactive reservation of flexible resources, and real-time rolling optimization, the proposed two-stage scheduling strategy fully exploits the flexible regulation potential of the integrated energy system and effectively enhances the resilient operation capability of the system. Compared with one-shot optimization based on the conventional flexible adjustment region, the proposed two-stage flexibility-supported optimal scheduling strategy reduces total load shedding and critical load shedding by 27.50% and 98.72%, respectively.