This file was created by the Typo3 extension sevenpack version 0.7.16 --- Timezone: CEST Creation date: 2023-03-30 Creation time: 21-57-30 --- Number of references 1 article Barholomay2021 eawe, Wind Energy Science 2021 6 221 - 245 This experimental load control study presents results of an active trailing-edge flap feedforward controller for wind turbine applications. The controller input is derived from pressure-based lift estimation methods that rely either on a quasi-steady method, based on a three-hole probe, or on an unsteady method that is based on three selected surface pressure ports. Furthermore, a standard feedback controller, based on force balance measurements, is compared to the feedforward control. A Clark-Y airfoil is employed for the wing that is equipped with a trailing-edge flap of x=c D 30% chordwise extension. Inflow disturbances are created by a two-dimensional active grid. The Reynolds number is Re D 290000, and reduced frequencies of k D 0:07 up to k D 0:32 are analyzed. Within the first part of the paper, the lift estimation methods are compared. The surface-pressure-based method shows generally more accurate results, whereas the three-hole probe estimate overpredicts the lift amplitudes with increasing frequencies. Nonetheless, employing the latter as input to the feedforward controller is more promising as a beneficial phase lead is introduced by this method. A successful load alleviation was achieved up to reduced frequencies of k D 0:192. ttps://doi.org/10.5194/wes-6-221-2021 doi.org/10.5194/wes-6-221-2021 S.Bartholomay T.Wester S.Perez-Becker S.Konze C.Menzel M.Hölling A.Spickenheuer J.Peinke C. N.Nayeri C. OPaschereit KilianOberleithner K.