METHOD AND APPARATUS FOR REDUCTION OF FATIGUE AND GUST LOADS ON WIND TURBINE BLADES

摘要

An adjustable lift regulating device (30, 32, 40, 50, 52, 56, 60, 68, 72, 76) on an inboard portion of a wind turbine blade (28). The lift regulating device is activated to reduce lift on the inboard portion of the blade by causing flow separation (41) on the suction side (22) of the blade. To compensate for the lost lift, the blade pitch is increased to a running pitch that facilitates stalling on the outer portion of the blade in gusts. This provides passive reduction of fatigue and extreme loads from gusts while allowing full power production under non-gust conditions.

主权项

1. A method for operating a wind turbine, comprising:
providing an adjustable lift regulating device other than pitch on an inboard portion of a wind turbine blade; reducing lift on the inboard portion of the blade at a first pitch of the blade by activating the lift regulating device responsive to a wind condition; and increasing the pitch of the blade to a second pitch greater than the first pitch to regain the reduced lift, wherein the second pitch facilitates stalling of an outer portion of the blade in a gust that increases an angle of attack thereof.