Abstract: In recent years, with the increase of EVs, the grid and traffic networks are closely connected. In 2018, the failure of the charging stations in Shenzhen caused a lot of EVs to stop working, which indicates that the disturbance of the grid may spread to the traffic network through the coupling of charging stations and EVs, resulting in a cascading failure. Therefore, aiming at the coupling of the grid-traffic networks, the propagation of fault disturbance is studied. Firstly, the coupling relationship between the two networks is analyzed, and the coupling network model is established on the basis of the multi-layer network theory. The travel chain is used to simulate the driving path of electric vehicles, and the travel and charging model of EVs is established. On the basis of the coupling network and considering the impact of charging station fault disturbance on EVs, the fault disturbance analysis method based on cascading failure of multi-layer network is proposed. Finally, the spatial-temporal propagation characteristics of charging station fault disturbance in traffic network are analyzed through simulation example. The results show that the proposed fault propagation analysis framework based on grid-transport network coupling can accurately describe the impact of grid disturbance on the traffic network. And the method can classify according to the temporal and spatial evolution characteristics of traffic conditions of different road sections, and provide a scientific basis for traffic managers to make decisions.

Key words: electric vehicles, complex network, multi-layer networks, cascading failure, disturbance propagation