&nbsp;Quasi-steady response and LLTR control of a wind turbine blade with bending-torsion coupled

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (13) : 123-129.

Quasi-steady response and LLTR control of a wind turbine blade with bending-torsion coupled

LIU Ting-rui, CHANG Lin

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Abstract

Quasi-steady responses of a wind turbine blade and its theoretical control process based on LQG with loop transfer recovery (LLTR) were studied to solve divergent instability of a composite thin-walled blade with bending-torsion coupled. The blade structure was modeled as a thin-walled single closed chamber airfoil based on laminated composite with circumferential asymmetric stiffness. The middle-line trajectory of the airfoil was the S809Ⅱairfoil type line. A quasi-steady aerodynamic model was extracted from stall aerodynamic models of helicopter blade, and after modified it was suitable for studying critical states of classical flutter and stall flutter of wind turbine blade. The LLTR control in two cases of input loop-based transfer recovery and output loop-based transfer recovery was investigated in detail. Through comparing the blade’s bending-torsion coupled responses with simulated controller responses and singular value Bode diagram, the stability of the LLTR control algorithm and its superiority in flutter suppression were verified. The real-time effects of the LLTR control algorithm were also examined with a hardware-in-the-loop simulation platform.

Key words

bending-torsion coupled / circumferential asymmetric stiffness / quasi-steady response / LLTR control / flutter suppression / hardware-in-the-loop simulation platform

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LIU Ting-rui, CHANG Lin. Quasi-steady response and LLTR control of a wind turbine blade with bending-torsion coupled[J]. Journal of Vibration and Shock, 2018, 37(13): 123-129

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