Optimized controller design of a FESS for power fluctuation smoothing of a wind farm

This paper presents a control scheme for a flywheel energy storage system (FESS) intended for smoothing out the power fluctuation of a grid-connected wind farm. The control goal is to make the FESS with limited capacity to provide energy as more as possible, so that the wind farm output can be smoothed further. In the proposed control scheme, the desired output of wind farm with FESS is determined by a sliding mean filter (SMF) with the wind power series as input. Then, considering the capacity of FESS is finite, a set point corrector is employed to correct the active power set point of FESS according to the state-of-charge (SOC), so as to maintain the speed of flywheel in proper range. The effectiveness of the proposed control scheme is verified by using the actual power output data of a wind farm, and the simulation results illustrate the satisfying capability of the scheme.