Individual variable pitch control of wind turbines

Focusing on the tilt moment and yaw moment caused by asymmetric wind, aerodynamic model for individual pitch control of large-scale wind turbine was established. As the aerodynamic model have characteristics of multiple variables, strong coupling and time-varying. First, we convert it into a linear time-invariant and non-coupled model utilizing a coordinate transformation, and so the controller design was simplified. Finally, take wind shearing as a disturbance and designed two independent PID controllers. The simulation results show that individual pitch control greatly reduced the moment and yaw moment of wind turbine.