With the proposal of “carbon peaking and carbon neutral”

the total installed capacity of renewable energy power units continues to increase. This may greatly challenge the safety and stability of power grid. The characteristics of flywheel energy storage system(FESS) are fast response

unlimited times of charge and discharge and deep depth of discharge. FESS has been widely used in frequency modulation and frequency safety improvement of power grid. In order to make full use of the advantage of flywheel energy storage in auxiliary frequency modulation of the power grid

an adaptive coordinated droop control strategy of primary frequency regulation coordinated with thermal power units was designed

which realized the power cooperative adaptive adjustment of the combined coal-fired thermal power units and storage systems. Simulation results show that

the proposed control strategy can effectively improve the frequency modulation performance of the combined firestorage system. Compared with the conventional droop control

the maximum dynamic frequency difference and steady frequency difference of the system reduces by 29.00% and 25.50% respectively

which eases the frequency modulation pressure of thermal power unit

and is benefit to safety and stability of the thermal power unit.