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A flywheel energy storage system (FESS) is associated to wind turbine (WT) to increase its penetration rate into the grid and to improve its contribution to the ancillary services. In this paper, the authors investigated a FESS associated to PMSM-wind turbine connected to the grid via a three-phase PWM inverter. The FESS is controlled by a FOC (flux oriented control) strategy cascaded with an external power loop for the supervision of the power reference value. A Direct Power Control (DPC) strategy is proposed to control the grid-connected converter due to its high transient capability and its constant switching behavior.
Date of Conference: 23-26 March 2009