Journal
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY
Volume 19, Issue 2, Pages 284-296Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCST.2010.2051810
Keywords
Fixed-structure feedforward; H-infinity-control; load alleviation; trailing-edge flaps; wind energy
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This paper studies the load reduction potential of a prototyped smart rotor. This is, a rotor where the blades are equipped with a number of control devices that locally change the lift profile on the blade, combined with appropriate sensors and controllers. Experimental models, using dedicated system identification techniques, are developed of a scaled rotating two-bladed smart rotor of which each blade is equipped with trailing-edge flaps and strain sensors. A feedback controller based on H-infinity-loop shaping combined with a fixed-structure feedforward control are designed that minimizes the root bending moment in the flapping direction of the two blades. We evaluated the performance using a number of different realistic load scenarios. We show that with appropriate control techniques the variance of the load signals can be reduced up to 90%.
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