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Effect of turbulence intensity on the linear quadratic control of spar buoy floating wind turbines

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Abstract

This paper evaluates the performance of a linear quadratic (LQ) optimal controller designed for a spar buoy floating offshore wind turbine (FOWT) considering different wind turbulence conditions. To account for the uncertainty in offshore wind turbulence intensity (TI), three levels of TI are adopted in the above rated wind speed region. The TI levels of 15%, 11% and 5% are based on an international standard for wind turbine design, measurements from the Hywind Demo FOWT, and long-term measurements from an offshore wind research platform, respectively. The control objectives are improved rotor speed/power regulation and floater pitch motion reduction, compared with a detuned proportional-integral (PI) controller, using collective blade pitch actuation. A two-dimensional modeling approach is adopted for LQ controller design, according to previous verification based on an available wind turbine simulator, assuming aligned wind and waves. The controller tuning is based on wind/wave disturbance models in the time domain. Simulations carried out for the reference OC3-Hywind spar FOWT exposed to the adopted TI levels of 15%, 11% and 5%, in rough sea state, show that the designed LQ controller can yield rotor speed/power variation reduction of approximately 55%, 46% and 12%, respectively, and floater pitch angle reduction of approximately 38%, 32% and 14%, respectively, with acceptable increase in the actuator activity, compared with the baseline PI controller. These results demonstrate that LQ design with suitable tuning can improve the control performance of a spar buoy FOWT in the presence of TI uncertainty.

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  1. Universidade Federal Do ABC (UFABC), CECS, Santo André, Brazil

    Roberto Luiz da Cunha Barroso Ramos

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da Cunha Barroso Ramos, R.L. Effect of turbulence intensity on the linear quadratic control of spar buoy floating wind turbines. Mar Syst Ocean Technol 16, 84–98 (2021). https://doi.org/10.1007/s40868-021-00098-4

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