Methods and apparatus for reducing asymmetric rotor load in wind turbines

摘要

A method for reducing load in a wind turbine (100), said method characterized by: measuring displacements or moments resulting from asymmetric loads on the wind turbine, measuring the displacement of a flange (132) of the main shaft; using said displacements or measured time to determine a step for each blade (108) of the rotor to reduce or counter asymmetric rotor loading and a loop secondary control for determining an orientation favorable yaw to reduce the activity of step and to adjust the yaw alignment of the wind turbine, according to the orientation favorable yaw; and adjusting the pitch of each blade (108) rotor according to the determined step to reduce or counter asymmetric rotor loading.