Power system tight balance processing method and system and storage medium

The invention discloses a power system tight balance handling method and system and a storage medium. The method comprises the steps that S1, an electric vehicle charging station model considering the uncertainty of the number of electric vehicles in an electric vehicle charging station is constructed; s2, regarding the electric vehicle charging station as a flexible load in a power system, and establishing an electric vehicle charging station constraint according to the electric vehicle charging station model; s3, the minimum total operation cost of the electric power system is used as an objective function, a tight balance processing model of the electric power system is established, and constraint conditions of the tight balance processing model of the electric power system comprise the flexible climbing capacity constraint capable of being provided by the electric vehicle charging station in the step S2; and S4, substituting real-time data of the electric power system into the tight balance processing mod