Primary frequency modulation method based on energy storage SOC recovery strategy

The invention relates to a primary frequency modulation method based on an energy storage SOC recovery strategy, and belongs to the technical field of wind storage frequency modulation. The method comprises the following steps: firstly, constructing a primary frequency modulation frequency domain model comprising a fan and stored energy, wherein the primary frequency modulation frequency domain model comprises constructing a fan primary frequency modulation model using fixed coefficient virtual inertia control and variable pitch control, and constructing a variable coefficient virtual droop control primary frequency modulation model using the energy storage SOC as a parameter; a frequency modulation dead zone is set, and the current system frequency is detected to judge the next action; when the frequency fluctuation exceeds the frequency modulation dead zone, the system performs a frequency modulation task; and when the frequency fluctuation of the system is within the dead zone range, the system performs an