A partial pitch wind turbine blade has aerodynamic profiles for stall and others for pitch control

摘要

A partial pitch wind turbine is described wherein the wind turbine blade has an inner blade section designed for stall-controlled operation and an outer blade section de signed for pitch-controlled operation. The different blade profiles for the different sec tions allow for the efficient operation of the blade while providing for the control of the wind turbine to effectively reduce blade root moments. The outer blade sections can be pitched out of the wind to reduce root moments due to the outer blade sections, while the increasing power capture of the inner blade section maintains nominal power out put.