A METHOD OF OPERATING A WIND TURBINE

摘要

A method of operating a wind turbine including a rotor comprising a wind turbine blade and having a substantially horizontal rotor shaft is described. The rotor compres a hub, from which the blade extends substantially in a radial direction when mounted to the hub. The blade comprises a profiled contour comprising a pressure side and a suction side as well as a leading edge and a trailing edge with a chord extending between the leading edge and the trailing edge, the profiled contour generating a lift when being impacted by an incident airflow, the profiled contour in the radial direction being divided into a root region with a substantially circular or elliptical profile closest to the hub, an airfoil region with a lift generating profile furthest away from the hub, and preferably a transition region between the root region and the airfoil region, the transition region having a profile gradually changing in the radial direction from the circular or elliptical profile of the root region to the lift generating profile of the airfoil region, wherein the airfoil region comprises a first base part having a leading edge and a trailing edge with a chord extending between the leading edge and the trailing edge, the airfoil region further being divided into at least a first longitudinal segment and a second longitudinal segment, the first longitudinal segment extending along at least 20% of a longitudinal extent of the airfoil region. The first base part has an inherent non-ideal aerodynamic design so that a substantial longitudinal part of the base part without flow altering devices at a design point deviates from a target axial induction factor, wherein the method comprises the steps of: a) adjusting a pitch of the blade and a rotational speed of the rotor so as to meet the target axial induction factor of the second longitudinal segment, and b) providing and arranging flow altering devices to the first longitudinal segment so as to meet the target axial induction factor of the first longitudinal segment.