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Dynamics of hybrid offshore renewable energy platforms: Heaving point absorbers connected to a semi-submersible floating offshore wind turbine.

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Bibliographic Details
Title: Dynamics of hybrid offshore renewable energy platforms: Heaving point absorbers connected to a semi-submersible floating offshore wind turbine.
Authors: da Silva, L.S.P.1,2,3 (AUTHOR) leandro.dasilva@adelaide.edu.au, Sergiienko, N.Y.1 (AUTHOR), Cazzolato, B.1 (AUTHOR), Ding, B.1 (AUTHOR)
Source: Renewable Energy: An International Journal. Nov2022, Vol. 199, p1424-1439. 16p.
Subject Terms: *Ocean wave power, *Renewable energy sources, *Ocean waves, *Wave energy, *Wind turbines, Hybrid systems, Floating bodies
Abstract: Hybrid platforms composed of a floating offshore wind turbine (FOWT) and wave energy converters (WECs) may possibly reduce the levelised cost of energy of both energy harvesting devices and improve the platform dynamics. This paper investigates the dynamics of a hybrid platform composed of a semi-submersible FOWT combined with three spherical heaving point absorbers (PAs), either floating or submerged, under turbulent wind and irregular waves conditions. Since the WECs are attached to the floating structure, complex hydrodynamic couplings occur between the floating bodies. In this regard, a parametric investigation of the power-take-off system is performed to understand the wave power absorption and motion characteristics, which are compared against their respective stand-alone configurations. At sea states with short wave peak period, both hybrid platforms (with floating or submerged PAs) were able to operate under maximum wave power absorption condition and extract nearly the same amount of wave energy as the PAs attached to the ground (stand-alone), while providing the additional benefit of reducing the horizontal nacelle accelerations of the FOWT. On the other hand, when operating at sea states with long wave periods, the hybrid platforms may need to restrict the wave power absorption capability to prevent additional nacelle horizontal acceleration. • Analyses the dynamics of two hybrid platforms under random wind and wave loads. • Provides insights on the performance and nacelle acceleration of hybrid platforms. • Presents a critical comparison of power and motion compared to standalone platforms. • Presents a sensitive analysis of the power take-off coefficients of hybrid platforms. [ABSTRACT FROM AUTHOR]
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Description
Abstract:Hybrid platforms composed of a floating offshore wind turbine (FOWT) and wave energy converters (WECs) may possibly reduce the levelised cost of energy of both energy harvesting devices and improve the platform dynamics. This paper investigates the dynamics of a hybrid platform composed of a semi-submersible FOWT combined with three spherical heaving point absorbers (PAs), either floating or submerged, under turbulent wind and irregular waves conditions. Since the WECs are attached to the floating structure, complex hydrodynamic couplings occur between the floating bodies. In this regard, a parametric investigation of the power-take-off system is performed to understand the wave power absorption and motion characteristics, which are compared against their respective stand-alone configurations. At sea states with short wave peak period, both hybrid platforms (with floating or submerged PAs) were able to operate under maximum wave power absorption condition and extract nearly the same amount of wave energy as the PAs attached to the ground (stand-alone), while providing the additional benefit of reducing the horizontal nacelle accelerations of the FOWT. On the other hand, when operating at sea states with long wave periods, the hybrid platforms may need to restrict the wave power absorption capability to prevent additional nacelle horizontal acceleration. • Analyses the dynamics of two hybrid platforms under random wind and wave loads. • Provides insights on the performance and nacelle acceleration of hybrid platforms. • Presents a critical comparison of power and motion compared to standalone platforms. • Presents a sensitive analysis of the power take-off coefficients of hybrid platforms. [ABSTRACT FROM AUTHOR]
ISSN:09601481
DOI:10.1016/j.renene.2022.09.014