Frequency modulation method and system for fused salt energy storage coupling thermal power generating unit

The invention relates to the technical field of power grid frequency modulation, and particularly provides a frequency modulation method and system for a fused salt energy storage coupling thermal power generating unit, and the method comprises the steps: carrying out the decomposition of a hybrid energy storage response demand through a VMD algorithm based on a first decomposition layer number, and obtaining a plurality of mode components and residual components; determining a target second decomposition layer number, wherein the sum of residual modal components obtained by decomposing the residual component through the VMD algorithm based on the target second decomposition layer number is equal to the residual component; calculating a center frequency index based on the modal component corresponding to the first decomposition layer number and the residual modal component corresponding to the target second decomposition layer number; updating the first decomposition layer number to obtain a new center freque