The interconnection of urban critical infrastructure poses new challenges to the secure operation of power grid-centric urban lifeline systems. The interdependencies among infrastructure systems increase the risk of cascading fault propagation

thereby threatening urban public safety. Coupling modelling and fault propagation simulation of urban lifeline systems provide a foundation for analysing disaster evolution mechanisms and support research on resilience assessment and enhancement technologies. In this paper

a coupling modelling and simulation method for urban lifeline systems under extreme disaster scenarios is proposed. First

based on fault propagation analysis requirements

the basic principles for coupling modelling are established

and simulation models suitable for lifeline systems under different time scales are analysed. Second

a co-simulation method combining time-driven and event-driven mechanisms is designed. Customised interfaces for information exchange between systems are developed based on mature simulation software

enabling the simulation of the disaster impact propagation process. Finally

the effectiveness of the proposed method is verified using a constructed urban lifeline coupling test system.