DEMONSTRATION RESULTS OF INDIVIDUAL BLADE PITCH ANGLE CONTROL: IMPROVING THE POWER PERFORMANCE OF A FLOATING OFFSHORE WIND TURBINE

抄録

Floating offshore wind turbines (FOWTs) can be subject to platform-pitching vibrations caused by blade pitch angle (BPA) motion. We proposed a control method for suppressing these vibrations and confirmed that it reduced the power below rated operating conditions. This report proposes an individual BPA control for FOWTs that improves the power performance below rated operating conditions. Its key function is to control rotor speed by recovering deviations of BPA from the optimal values, although the deviations are generated to suppress the vibrations. A demonstration using a full-scale 2 MW FOWT with a spar showed that the proposed control improved power performance.