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Frequency-Weighted Model Predictive Control of Trailing Edge Flaps on a Wind Turbine Blade

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5 Author(s)
Castaignet, D. ; Technol. & Service Solutions, Vestas Wind Syst. A/S, Arhus, Denmark ; Couchman, I. ; Poulsen, N.K. ; Buhl, T.
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This paper presents the load reduction achieved with trailing edge flaps during a full-scale test on a Vestas V27 wind turbine. The trailing edge flap controller is a frequency-weighted linear model predictive control (MPC) where the quadratic cost consists of costs on the zero-phase filtered flapwise blade root moment and trailing edge flap deflection. Frequency-weighted MPC is chosen for its ability to handle constraints on the trailing edge flaps deflection, and to target at loads with given frequencies only. The controller is first tested in servo-aeroelastic simulations, before being implemented on a Vestas V27 wind turbine. Consistent load reduction is achieved during the full-scale test. An average of 13.8% flapwise blade root fatigue load reduction is measured.

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Control Systems Technology, IEEE Transactions on  (Volume:21 ,  Issue: 4 )