1.School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;2.Northeast Branch of State Grid Corporation of China, Shenyang 110170, China

In the context of frequent occurrence of multiple types of extreme weather and the continuous increase in the proportion of renewable energy, to ensure the safe and stable operation of the future power system under extreme weather conditions, a full-scenario risk assessment method of new power system planning scheme for multiple types of extreme weather is proposed. Firstly, potential extreme weather that causes actual regional power grid risks is screened from historical information, and the mapping relationship between meteorological factors and power grid status is analyzed to propose a power grid risk scenario recognition method based on extreme meteorological conditions. Secondly, a multi-uncertainty model for risk scenarios is established for factors such as source and load power, equipment failures under extreme weather conditions, risk scenarios and their probabilities are generated. At the same time, considering the characteristics of the future power grid and the impact of extreme weather, a targeted risk consequence index system for planning schemes has been proposed from the perspectives of adequacy, flexibility and safety stability. In response to the problem of inaccurate and efficient simulation of the operation status of the actual power grid risk assessment in the future, a practical power grid consequence calculation method based on the state grid planning simulation analysis and calculation platform has been proposed. Finally, the planned power grid in Northeast China in 2025 has been evaluated, and its high-risk areas and risk categories under high-temperature and windless, and blizzard weather conditions have been analyzed.