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Adaptive State Feedback Pitch Angle Control of Wind Turbines for Speed Regulation and Blades Loadings Alleviation

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This research article presents an adaptive state feedback blades pitch control of wind turbines for speed regulation and structural blades loadings mitigation in high wind speeds. The proposed control is a combination of a state feedback control and an integrator. It enables to improve the generator speed tracking, as well as to reduce the flap-wise bending moment at the root of the blades. The motivation principal of the proposed controller is that its structure allows surpassing the trade-off between the control objectives. The control scheme is tested on the NREL’s FAST 5 MW baseline wind turbine model in MATLAB/Simulink under different wind speed profiles and its performances are compared with those of the baseline gain scheduling proportional integral (GSPI) control and the disturbance accommodation control (DAC). The simulation results enable to conclude that the proposed controller has good performances in term of generator speed tracking as well as blade root flap-wise bending moment fluctuations reduction. Moreover, the controller is tested to be robust under system uncertainties.
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Adaptive State Feedback; FAST Wind Turbine; Root Flap-Wise Bending Moment; Speed Regulation; Uncertainties Model

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