  In this paper, an offset-free bilinear model predictive control approach for
wind turbines is presented. State-of-the-art controllers employ different
control loops for pitch angle and generator torque which switch depending on
wind conditions. In contrast, the presented controller is based on one unified
control law that works for all wind conditions. The inherent nonlinearity of
wind turbines is addressed through a piecewise-affine approximation of the
power coefficient, which is modelled in a mixed-integer fashion. The presented
controller is compared to a state-of-the-art baseline controller in a numerical
case study using OpenFAST. Simulation results show that the presented
controller ensures accurate reference power tracking. Additionally, damage
equivalent loads are reduced for higher wind speeds.
