Research on improving power quality of wind power system based on the flywheel energy storage system

With the increasing penetration of wind power, impacts of the wind power random nature on the power quality, especially on voltage quality, increase gradually. Flywheel energy storage system (FESS) has the ability of independent regulating active power and reactive power. This paper designed the energy management system (EMS) model of FESS which can be used to improve the power quality of the grid. The model is based on the bi level decision model. The upper layer uses the fuzzy algorithm to solve the charging and discharging power of the FESS through assess the state of FESS and the amount of wind power fluctuations, the lower layer control the energy exchange between FESS and grid through by control the back-to-back converters based on dual-loop control. The voltage fluctuation of the PCC was compared using the FESS before and after in the MATLAB/Simulink simulation environment. The simulation results verify the validity of the model. The model can improve the utilization efficiency of FESS and the power quality of the system through the cooperation between the wind power and energy storage system.