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Aerodynamic Load Control in HAWT with Combined Aeroelastic Tailoring and Trailing-Edge Flaps


B.F. Ng, R. Palacios, E.C. Kerrigan, J.M.R. Graham, H. Hesse

Wind Energy

This paper presents an aeroservoelastic modeling approach to investigate dynamic load alleviation in large wind turbines with composite blades and trailing-edge aerodynamic surfaces. The tower and rotating blades are modeled using geometrically-nonlinear composite beams, and linearized about reference rotating conditions with potentially arbitrarilylarge structural displacements. The aerodynamics of the rotor are represented using a linearized unsteady vortex-lattice method and the resulting aeroelastic system is written in a state-space description that is both convenient for model reductions and control design. A linear model of a single blade is then used to design an Hinf regulator, capable of providing load reductions of up to 13% in closed-loop on the full wind turbine nonlinear aeroelastic model. When combined with passive load alleviation through aeroelastic tailoring, dynamic loads can be further reduced to 35%. While the separate use of active flap controls and passive mechanisms for load alleviation have been well-studied, an integrated approach involving the two mechanisms has yet to be fully explored and is the focus of this paper. Finally, the possibility of exploiting torsional stiffness for active load alleviation on turbine blades is also considered.


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% Autogenerated BibTeX entry
@Article { NgEtal:2015:IFA_5203,
    author={B.F. Ng and R. Palacios and E.C. Kerrigan and J.M.R. Graham and H.
    title={{Aerodynamic Load Control in HAWT with Combined Aeroelastic
	  Tailoring and Trailing-Edge Flaps}},
    journal={Wind Energy},
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