A "smart rotor" is a wind turbine rotor that, through a
combination of sensors, control units and actuators actively
reduces the variation of the aerodynamic loads it has to withstand.
Smart rotors featurepromising load alleviation potential and might
provide the technological breakthrough required by the next
generation of large wind turbine rotors.
The book presents the "aero-servo-elastic "model of a smart
rotor with Adaptive Trailing Edge Flaps for active load alleviation
and provides an insight on the rotor aerodynamic, structural and
control modeling. A novel model for the unsteady aerodynamics of an
air foil section with flap is presented and coupled with a
multi-body structural representation. A smart rotor configuration
is proposed, where the Adaptive Trailing Edge Flaps extend along
the outer 20 % of the blade span. Linear Quadratic and Model
Predictive algorithms are formulated to control the flap
deflection.The potential of the smart rotor is finally confirmed by
simulations in a turbulent wind field. A significant reduction of
the fatigue loads on the blades is reported: the flaps, which cover
no more than 1.5 % of the blade surface, reduce the fatigue load by
15 %; a combination of flap and individual pitch control allows for
fatigue reductions up to 30 %."
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