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The random fluctuation of output power of modern distributed power generation system brings many hidden dangers to the safe operation of power grid, and the application of energy storage system is the most effective way to smooth the output power of distributed power generation. Based on the analysis of the structure and charge-discharge dynamic performance of the flywheel energy storage system, the permanent magnet brushless DC motor (PMBLDCM) is proposed as the flywheel motor, and the charging and discharging mathematical model of the flywheel energy storage system based on PMBLDCM is established. Using MATLAB/Simulink, the simulation model of flywheel energy storage system with speed-current double closed Loop is established. The simulation results show that the system can effectively control the flywheel energy storage system to achieve two-way energy conversion, and effectively stabilize power fluctuations. Introduction Wind energy is widely used because of its abundant resources and no pollution to the environment [1] . However, the variation of wind speed is volatile, and a small change of wind speed will cause a great change in the output power of wind turbines, which makes wind power generation have many defects in conversion efficiency and stability [2] . At present, adding energy storage devices in wind farms has become an effective way to solve the problem of random fluctuation of wind power [3] . In 2018, Y. Cong, X. Meng, L. Wang and Y. Wang installed battery energy storage devices in wind turbines to suppress power fluctuation [4] . Although battery energy storage technology has been relatively mature at this stage, there are still some problems in the application process, such as high cost, serious environmental pollution and short service life. In the same year, P. Mukherjee and V. V. Rao studied the use of superconducting energy storage systems to smooth power fluctuations in power systems containing wind power [5] . However, there are some shortcomings, such as the critical temperature of superconducting materials to be improved, high cost, complex equipment and immature supporting technology. Because of its long life, more cycles, high energy density, pollution-free, and good dynamic performance, flywheel energy storage system is selected as energy storage device, permanent magnet brushless DC motor is selected as flywheel motor. By using MATLAB/Simulink, the double closed-loop control system of flywheel energy storage system based on permanent magnet brushless DC motor is constructed, the charging and discharging states of the flywheel energy storage system are simulated. Through the analysis of simulation results, the correctness and validity of the model and the control method are verified. The Principle and Structure of Flywheel Energy Storage System Composition and Energy Storage of Flywheel Energy Storage System The structure of the flywheel energy storage system is shown in Fig. 1 [6] .

Properties Dynamic Simulation of the Flywheel Energy Storage System Model with Speed-Current Double Closed Loop