In the context of deep coupling between urban power grid and other infrastructure systems

it is extremely important to consider the impacts of urban power grid failures on metro network in extreme scenarios

construct urban power-metro coupling network model

and assess the vulnerability of urban power grid to improve urban resilience. Firstly

based on the centralized power supply mode of the metro

the topology and operation modes of the urban power grid

the traction power grid

and the metro network

as well as the coupling relationship among the three

are analyzed. The urban power-metro coupling network model considering the traction power grid is established. Subsequently

considering the impact of grid outage on the metro power supply in extreme scenarios

the fault propagation model that spans the urban power grid

the traction power grid

and the metro network is established. The metro fault load redistribution method based on passenger flow transfer is also proposed to portray the impact of city grid faults on metro operation services. Then

considering the vulnerability of the urban power-metro coupling network

the indicators and methods for assessing the vulnerability of the power grid that account for the loss of metro operational services are proposed. Finally

taking a city's power grid and metro network as an example

under the extreme scenario of attacks on the city's power grid

the vulnerability of the urban power-metro coupling network is quantitatively analyzed

considering the impact of the coupled metro network. The vulnerable nodes and regions of the urban power grid are identified

and the impact of the temporal changes of load and passenger flow is analyzed. The reulsts can provide reference for improving the resilience of the urban power-metro coupling network.