METHOD FOR CONTROLLING AND BRAKING WIND TURBINE BASED ON INDIVIDUAL PITCH CONTROL

摘要

A method for aerodynamic braking based on the independent pitch for horizontal-axis wind turbines is disclosed. The pitch angle of each blade is increased by the pitch driver installed on each blade while a wind turbine adopts pitch-to-feather braking. In accordance with the change rate of the pitch angle of each blade, the pitch angle of each blade is adjusted, respectively. Strain sensors are installed at the root of each blade, sensors used for the blade pitch measurement are installed on the inner edge of the hubs, and the pitch actuators and controllers are installed in the nacelle of the wind turbine. The respective magnitude of the tensile force is measured by the strain sensors at the roots of the three blades, and the resultant change rate is calculated. At different time instants, the pitch angle is increased to its maximum 90 degrees by using the pitch actuator.