Patent ID: 9719491
Date: 2017-08-01
CPC Classifications: F03D,F05B,Y02E

Claim:
1. A method for minimizing yaw torque needed to limit power output of an upwind two-bladed wind turbine with a teetering hinge, the turbine having a rotor designed to run clockwise, when seen from coming wind, and being housed in a nacelle atop a tower, the method comprising: yawing rotor axis counterclockwise, when seen from above the nacelle, away from wind direction to limit the power output for wind speeds higher than rated wind speed while rotor torque is kept at its rated value, wherein yawing the rotor axis reduces teetering amplitude of the blades, and wherein the teetering amplitude is reduced more when the blades are in a vertical position than when the blades are in a horizontal position.