LVRT Control Method of Flywheel Energy Storage System Based on VSG

Flywheel energy storage system (FESS) is qualified with high dynamic response performance in active power supply. The virtual synchronous generator (VSG) technique enables grid-connected converters to simulate the operation mechanism of synchronous generators. Applying VSG in FESS helps to improve the stability of the grid. This paper established the model of FESS, and a low voltage ride through (LVRT) control method for this combining system is developed. Simulation results in MATLAB/Simulink verified the effectiveness of the proposed method. During the fault of the power grid, both the voltage source characteristics and the inertia characteristics of the VSG control method can be ensured, and the FESS can provide certain amount of active and reactive power for the grid.