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Exploiting bend-twist coupling in wind turbine control for load reduction

: Wiens, M.; Meyer, T.; Wenske, J.

Volltext ()

IFAC-PapersOnLine 53 (2020), Nr.2, S.12139-12144
ISSN: 2405-8963
ISSN: 1474-6670
International Federation of Automatic Control (IFAC World Congress) <21, 2020, Online>
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWES ()

The ever-increasing dimensions of wind turbines are associated with higher structural loads. Therefore, there is a demand for advanced load reduction techniques. In the design of rotor blades, the bend-twist coupling effect is used for passive load reduction. This research shows how this effect can be augmented with active load reduction through controls that exploit bend-twist coupling. The twist rate of the rotor blades is utilized for gust detection. In addition to regular closed-loop pitch control, the twist rate is used to adjust the collective pitch angle using feedforward control. Extreme loads for flap-wise bending moment can be reduced on average by up to 6 % and tower acceleration is reduced by 15 %. Overall, this method is suitable for reducing extreme loads while maintaining fatigue damage compared to the reference case.