DTC-SVPWM of an energy storage flywheel associated with a wind turbine based on the DFIM

In this study, we will control the inertial energy storage, called inertial energy storage system, coupled with a wind energy conversion system that aims to improve power quality of the transit network. Inertial storage was considered to be a flywheel coupled with an induction motor and controlled by a voltage inverter type power converter. First, a model of inertial energy storage system ( flywheel + asynchronous machine) is presented; then, two control methods, namely, the Direct Torque Control (DTC) and DTCconventional SVPWM (space vector pulse with modulation), are proposed. The two control methods gave similar performance, but the DTC-SVPWM required less computation time. The two regulators and the proportional integrator SVPWM technique were used to determine the switching frequency. Using direct control with vector modulation strategy enabled the inertial energy storage system to attain good continuation, even under rather severe operating conditions, and the torque ripples were significantly reduced compared to the case of conventional DTC. The obtained simulation results are presented in this study.