Verfahren zur Reduktion von aerodynamischen Unwuchten von Windenergieanlagen

The invention relates to a method for reducing the aerodynamic imbalance of a wind turbine when the rotor rotates, wherein, in the context of an oscillation measurement in the original state, an original axial oscillation of a rotor (2) is determined with an oscillation amplitude âur,ax and a phase angle φυr,ax, whereupon by adjusting a blade setting angle of at least one rotor blade (7) an aerodynamic imbalance is caused in terms of location and size with a resulting total blade pitch angle change αpitch,test and a resulting phase angle φ(αpitch,test); subsequently, a single oscillation measurement is carried out again in the test state for determining an axial oscillation with an oscillation amplitude âtest,ax and a phase angle φtest,ax > which allow the determination of an axial balancing pointer with the amount ẑtarier,ax and phase change Δφ and a tare value tarn while taking into account the original axial oscillation, followed by the determination of a necessary blade pitch angle change αpitch,korr and a phase angle φkorr, on which the blade pitch angle change αpitch,korr has to be made, in order to correct the original aerodynamic imbalance, including a vectorial allocation of the blade pitch angle change αpitch,korr to at least one rotor blade (7).