This paper presents a methodology to design an
effective wind speed observer using an alternative mathematical
representation of the aerodynamic torque of a variable-speed wind
turbine. This alternative model is linear in parameters. Then, using
this observer, a pitch fault detection scheme is conceived. Numerical
experiments using the National Renewable Energy Laboratory wind
turbine simulator FAST (Fatigue, Aerodynamics, Structures, and
Turbulence) code were performed to support the design.