Patent ID: 7878760

Claim:
Method for operating a wind power plant, wherein the wind power plant ( 10 ) has at least one rotor ( 18 ) having at least one rotor blade ( 22 ) and a generator for converting the mechanical energy of the rotor ( 18 ) into electrical energy, comprising the steps of: determining or measuring at least one characteristic that is directly or indirectly dependent on forces acting on the at least one rotor blade ( 22 ) and/or conversely depend on these forces acting on the rotor blade, during the movement of rotation of the rotor ( 18 ), counterforces counteracting the forces acting on the rotor blade are introduced into the at least one rotor blade ( 22 ) in dependence on respective the at least one characteristic determined or measured, counterforces are introduced into the at least one rotor blade ( 22 ) that produce a pretension of the at least one rotor blade ( 22 ), and the introduction of the counterforces into the or each of the at least one rotor blade ( 22 ) is controlled periodically in such a manner that the pretension with which the at least one rotor blade ( 22 ) is loaded outside its tower pass is reduced when the at least one rotor blade is in the area of the tower pass in the course of the movement of rotation.