Risk Assessment Method for Urban Distribution Systems Under Extreme Heavy Rain Disasters

Extreme natural disasters often lead to large-scale power outages in urban distribution systems. Therefore, this paper models extreme torrential rain disasters and proposes a risk assessment method for urban distribution systems under such extreme conditions. The research includes: describing the impact of torrential rain on distribution systems; dividing the power supply area into grids and establishing a time-varying failure rate model for equipment; setting up power flow constraints; and proposing operational risk indicators.Using the IEEE-33 bus system as an example, the results show that this method can effectively assess the risk of distribution systems under extreme torrential rain conditions.