Hybrid energy storage system frequency modulation control method and system based on adaptive modal number VMD algorithm

The invention discloses a hybrid energy storage system frequency modulation control method and system based on an adaptive modal number VMD algorithm. The method comprises the following steps: adaptively determining a frequency division modal number based on operation characteristics of energy storage equipment; a sliding sampling window based on the FIFO principle and endpoint mirror image continuation is designed, and real-time decomposition application of the VMD algorithm is achieved; dividing a frequency modulation power instruction of the AGC system into a high-frequency component and a low-frequency component, and respectively issuing the high-frequency component and the low-frequency component to energy storage equipment with corresponding operation characteristics; the superiority of the VMD algorithm is fully played, the endpoint effect and mode aliasing problems are solved, dependence on original signals is reduced, meanwhile, self-adaptive adjustment of the frequency division mode on the operation