Patent ID: 7605488
Filing Date: 2009-10-20
Classification: F03D,F16H,Y02E

Abstract:
1. Method for operating a wind turbine comprising a drive train driving one or more electrical generators ( 23 , 31 ) that supply power to an electric grid ( 11 ), the drive train including a rotor hub ( 13 ), to which one or more blades are attached, a main shaft ( 15 ), a gearbox ( 17 ) and connecting shafts ( 19 ) to said one or more electrical generators ( 23 , 31 ), characterized in that, in events that can create a load inversion in the gearbox ( 17 ), a drive train dump load ( 5 ) is activated for ensuring that the drive train torque has a constant direction, avoiding the impact of backlashes in the gearbox ( 17 ), said dump load ( 5 ) consisting of power absorbed by one or several means chosen among means specifically dedicated to the absorption of said dump load ( 5 ) and means present at the wind turbine for other purposes.