Abstract: The rapid development of new energy sources has had a certain impact on the original power grid structure,leading to increased wear and tear of unit equipment,which has had a certain impact on the stability,safety,and economy of thermal power unit operation.Therefore,it is proposed to add an energy storage system to solve the above problems.Based on the current research status at home and abroad,a unit,steam turbine,and SOC based output control strategy model are proposed,and a two region power grid is built through Matlab/Simulink for simulation and simulation.The results indicate that under step disturbance,after coupling the 1 MW wheel energy storage system with unit 1 in region 1,the peak value drops to 1.93×10^-3 pu,reduced by 4×10^-4 pu,accounting for 9.39%of the original frequency fluctuation,and the actual output of the unit ranges from 2.45×10^-2 pu reduced to 1.61×10^-2 pu,reduced by34%.The results indicate that under the same external disturbance conditions,using flywheel energy storage to assist in frequency regulation of thermal power units can effectively reduce system frequency fluctuations,reduce turbine output power fluctuations,and improve frequency regulation performance.