Modeling and Vulnerability Analysis of Multi-layer Urban Electric-transportation Interdependent Networks Under Extreme Events

The increasing electrification of urban transportation, i.e., subways and electric vehicles (EV), brings more interactions between the power system and transportation system and further results in fault propagation across them. To analyze vulnerability of the coupling system under extreme events, this paper establishes a multilayer urban electric-transportation interdependent network (ETIN) model. First, a weighted coupled metro-road traffic network (CTN) model and network path planning approach are proposed. A prospect theory-based failure load redistribution (FLR) method is further established to account for uncertainty of TN link capacity affected by power supply. Second, topology and emergency control strategy of power network (PN) are modeled, followed by formulation of multilayer ETIN model. In particular, the inter-layer fault propagation from PN to TN is modeled based on power supply correlation strength, while from TN to PN is modeled based on traffic flow. A few indexes are then defined to quantify vulnerability of ETIN under deliberate attack. Finally, the proposed method is verified on an electric-transportation system to show influence of fault propagations within ETIN on its vulnerability under extreme events.