A vibration damping MPPT strategy for wind turbines using delayed feedback

Abstract At low speeds, wind energy conversion systems (WECS) can extract a maximum output power for a reference wind turbine-wind speed ratio. While the classical control strategy aims at tracking this Maximum Power Point using Power Signal Feedback, the transmission shaft flexibilities may yield undesirable mechanical vibrations. In this paper, a controller embedding a delayed power signal is proposed which is able to damp vibrations, when the time-delay is adequately chosen, while tracking the optimal set-point. Other strategies involving time-delayed feedback are proposed and simulations show the relevance of the proposed approach.

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