Performance Analysis of a Flywheel Energy Storage System

The flywheel energy storage systems (FESSs) are suitable for improving the quality of the electric power delivered by the wind generators and to help these generators to contribute to the ancillary services. In this paper, a flywheel energy storage system associated to a grid connected variable speed wind generation (VSWG) scheme using a doubly fed induction generator (DFIG) is investigated. Therefore, the dynamic behavior of a wind generator, including models of the wind turbine (aerodynamic), DFIG, matrix converter, converter control (algorithm of VENTURINI) and power control is studied. This paper investigates also, the control method of the FESS with a classical squirrel-cage induction machine associated to a VSWG using back-to-back AC/AC converter. Simulation results of the dynamic models of the wind generator are presented, for different operating points, to show the good performance of the proposed system.