Lyapunov-Based Framework for Platform Motion Control of Floating Offshore Wind Turbines

Mandar Phadnis and Lucy Pao ()
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Mandar Phadnis: College of Engineering and Applied Science, University of Colorado Boulder, Boulder, CO 80309, USA
Lucy Pao: College of Engineering and Applied Science, University of Colorado Boulder, Boulder, CO 80309, USA

Energies, 2025, vol. 18, issue 15, 1-21

Abstract: Floating offshore wind turbines (FOWTs) unlock superior wind resources and reduce operational barriers. The dynamics of FOWT platforms present added engineering challenges and opportunities. While the motion of the floating platform due to wind and wave disturbances can worsen power quality and increase structural loading, certain movements of the floating platform can be exploited to improve power capture. Consequently, active FOWT platform control methods using conventional and innovative actuation systems are under investigation. This paper develops a novel framework to design nonlinear control laws for six degrees-of-freedom platform motion. The framework uses simplified rigid-body analytical models of the FOWT. Lyapunov’s direct method is used to develop actuator-agnostic unconstrained control laws for platform translational and rotational control. A model based on the NREL-5MW reference turbine on the OC3-Hywind spar-buoy platform is utilized to test the control framework for an ideal actuation scenario. Possible applications using traditional and novel turbine actuators and future research directions are presented.

Keywords: floating offshore wind turbine; wind turbine control; Lyapunov methods (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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