Resilience Assessment of Power Distribution System against Rainstorm-Induced Urban Waterlogging

Frequent rainstorm-induced urban waterlogging poses a severe threat to power distribution systems, resulting in widespread and prolonged outages. Reasonable resilience assessment is an essential prerequisite for disaster prevention and mitigation planning. This paper proposes a pluvial flood resilience assessment framework for distribution systems based on disaster scenario simulation. In the framework, the time evolution of the rainstorm and surface runoff process is simulated, and the pluvial flooding impact is assessed. A distribution system response model based on the time-space network with arrival time function (TSN-ATF) is developed to simulate the power restoration process in conditions of urban road inundation. The parameterized IEEE storm resilience metric is subsequently utilized to quantify the distribution system resilience. Case studies are performed on the modified 33-node test system and a real-world distribution system in central China. Numerical results reveal that flooding duration and site accessibility are critical factors that impede post-rainstorm emergency repair efforts and considerably affect system resilience.