METHOD OF OPERATING A WIND TURBINE
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United States of America Patent
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Sep 5, 2013
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Sep 7, 2012
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Abstract
Method of operating a wind turbine comprising detecting when a first blade substantially approaches the shadow of the tower, and pitching at least one other blade, which is in or approaching a position above the tower, to increase the angle of attack and wind load on said at least one other blade in such a way that an increase of the tilt angle of the rotor is caused. The method further comprises detecting when the first blade is substantially close to leaving the shadow of the tower, and pitching the at least one other blade to decrease the angle of attack and wind load on said at least one other blade in such a way that the previously caused increase of the tilt angle of the rotor is cancelled.
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