Control method and device for step-by-step stable operation of power grid

The invention provides a control method and device for step-by-step stable operation of a power grid. The method comprises the following steps: S1, acquiring typhoon level data of a target area and state information of a tie line between a power grid system of the target area and an external power grid system in real time; S2, when the typhoon grade data exceed a preset grade warning line, entering a pre-event control stage; S3, after the pre-event control stage is completed, determining whether to enter an in-event control stage or not according to the state information of the tie line between the power grid system of the target area and the external power grid system, and if so, executing step S4, or if not, returning to execute the step S1; and S4, after the in-event control stage is completed, operating the power grid system of the target area in an isolated network mode. Through three control stages, namely, a pre-event control stage, an in-event control stage and a post-event control stage, a power grid