Aeroelastic Design and LPV Modelling of an Experimental Wind Turbine Blade equipped with Free-floating Flaps

The Science of Making Torque from Wind

Navalkar, S.T.^1 ; Bernhammer, L.O.^2 ; Sodja, J.^3 ; Slinkman, C.J.^1 ; Van Wingerden, J.W.^1 ; Van Kuik, G.A.M.^2

Delft Center for Systems and Control, Delft University of Technology, Delft

2628 CD, Netherlands^1

Wind Energy Group, Delft University of Technology, Delft

2629 HS, Netherlands^2

Aerospace Structures and Computational Mechanics, Delft University of Technology, Delft

2629 HS, Netherlands^3

关键词: Aeroelastic control;    Aeroelastic coupling;    Aeroelastic modeling;    Analytical and numerical methods;    Linear parameter varying;    State;    space models;    Wind tunnel experiment;    Wind turbine blades;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/4/042010/pdf
DOI  :  10.1088/1742-6596/753/4/042010

来源: IOP

【 摘 要 】

Trailing edge flaps located outboard on wind turbine blades have recently shown considerable potential in the alleviation of turbine lifetime dynamic loads. The concept of the free-floating flap is specifically interesting for wind turbines, on account of its modularity and enhanced control authority. Such a flap is free to rotate about its axis; camberline control of the free-floating flap allows for aeroelastic control of blade loads. This paper describes the design of a scaled wind turbine blade instrumented with free-floating flaps, intended for use in wind tunnel experiments. The nature of the flap introduces a coupled form of flutter due to the aeroelastic coupling of flap rigid-body and blade out-of-plane modes; for maximal control authority it is desired to operate close to the flutter limit. Analytical and numerical methods are used to perform a flutter analysis of the turbine blade. It is shown that the potential flow aeroelastic model can be recast as a continuous-time Linear-Parameter-Varying (LPV) state space model of a low order, for which formal controller design methodologies are readily available.