Resilience Assessment for Urban Power-Metro Interdependent Networks

The power supply from urban power network (UPN) ensures the proper operation of the urban metro network (MN). However, due to the close mutual connections, the negative impact of a power outage can propagate to the MN through a traction power network (TPN). Therefore, it is pressing to assess the resilience of such coupled networks. This paper initially proposes a multi-layer power-metro interdependent network (PMIN) model by integrating physical characteristics of UPN, TPN and MN into their topology networks. In the PMIN, the interdependence of UPN, TPN and MN is established in a hierarchical manner, where the community-based TPN model is practically elaborated to bridge fault propagation from the disabled UPN the to MN. Next, the traditional MN is equivalently converted into a mission-oriented network to simulate passenger rerouting processes, enabling the exploration of rerouting-incurred cascading failure with three proposed failed load redistribution disciplines. Finally, the resilience curves and assessment metrics are proposed to evaluate the resilience of the PMIN, with consideration of coupling effects among the UPN, TPN, and MN. The proposed method is applied to a quasi-authentic PMIN to reveal the fault propagation mechanisms and vulnerability characteristics of critical components within the PMIN, ultimately contributing to resilience enhancement.