Coordinating multi-energy to improve urban integrated energy system resilience against extreme weather events

The urban integrated energy system (UIES)' s ability to deliver power, heat and gas to users uninterruptedly even under a high impact and low probability event is critical to the safety and living quality of city residents and also the economy of the urban area. This paper proposes a load restoration strategy based on multi-energy coordination to improve the resilience of UIES, with the goal of restoring important loads as much as possible. The proposed restoration strategy introduces the minimum diameter spanning tree (MDST) method to UIES, and changes the topology of the system accordingly to reorganize the various "islands" after the extreme event, so as to ensure that the operating radius of the area is the smallest, and to alleviate the drops of voltage, air pressure and temperature. On this basis, the proposed restoration strategy also includes a method to better utilize the complementarity of energy sources by coordinating all power, gas and heat sources in the area to ensure the uninterrupted energy supply for important loads in the integrated electricity/gas/heating system. Finally, this paper verifies the feasibility and effectiveness of the proposed method through UIES E33-G14-H6 test system and UIES E123-G48-H32 test system.