AGC control method and system of power grid

The invention discloses an AGC control method and system of a power grid, and belongs to the technical field of automatic power generation control. The method comprises the following steps: partitioning regional frequency modulation resources of a power grid, and obtaining regional frequency modulation requirements of the power grid; according to the regulation quantity issued by the power grid and the unit execution condition of the power grid, calculating the current residual regulation quantity of the power grid; according to the regional frequency modulation demand and the current residual adjusting quantity, determining an AGC master station issuing adjusting quantity of the power grid; according to the subarea of the regional frequency modulation resource, determining the distribution regulation quantity of the regulation quantity issued by the AGC master station in different subareas; and according to the allocation adjustment amount, on the basis of the type of the resource partition of each region, c