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Coupled dynamic analysis of semi-submersible floating wind turbine integrated with oscillating water column WEC

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Abstract

The present study envisages to investigate the coupled dynamic behaviour of three configurations of a hybrid wind-wave energy system integrating Oscillating Water Column (OWC) wave energy converters to DeepCwind semi-submersible supporting an NREL (National Renewable Energy Laboratory) 5 MW wind turbine. DeepCwind semi-submersible is a platform designed specifically for the purpose of supporting floating offshore wind turbines and the stability of the platform has been well confirmed by scaled-down experiments and numerical studies. The numerical simulation for the present study is performed using the aero-hydro-servo-elastic tool OpenFAST. The dynamic responses of the hybrid platforms are determined for different operational and parked wind speed conditions of the wind turbine in irregular waves. The motion responses, tower base forces and moments, mooring tensions and power absorption of the hybrid configurations have been characterized. Furthermore, the effect of coupling between the semi-submersible platform and the OWCs is studied by comparing the results of the combined platforms with that of the uncoupled wind energy platform. The coupled dynamic analysis in the time domain shows that increasing the number of OWC helps to reduce the motion responses in heave and pitch. The capture width ratio of the system is observed to be highest for hybrid configuration with a single OWC device. The present study will be helpful in the design and analysis of hybrid floating wave-wind energy platform.

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Availability of data and materials

The data that support the findings of this study are available on request from the corresponding author.

Abbreviations

\(A_{ij}\) :

Added mass matrix of the floating body

\(B_{ij}\) :

Coefficient of radiation damping

\(B_{pto}\) :

Damping coefficient of PTO system

\(C_{ext}\) :

Hydrostatic stiffness of the mooring lines

\(C_{ID}\) :

Axial structural damping coefficient

\(C_{ij}\) :

Restoring coefficient

\(F_{i,\text{current}}\) :

Force of current flow

\(F_{i,\text{diffraction}}\) :

Diffraction force

\(F_{i,ext}\) :

External load on the floating platform

\(f_{i,ext}\) :

External forces acting on the mooring line

\(F_{i,\text{hydrostatic}}\) :

Hydrostatic force

\(f_{i,\text{int}}\) :

Internal forces acting on the mooring line

\(F_{i,\text{radiation}}\) :

Radiation force

\(F_{i,\text{viscous}}\) :

Viscous force

\(F_{i,\text{wave}}\) :

Wave force

\(K_{ij}\) :

Retardation function

\(P_{abs}\) :

Power absorbed by wave energy converter

\(P_{\text{wave}}\) :

Wave power

\(S\left( \omega \right)\) :

Wave spectrum

\(S_{R} \left( \omega \right)\) :

Response spectrum of the floating platform

\(T\) :

Tension in mooring line

\(T_{p}\) :

Peak spectral period

\(u_{f}\) :

Fluid particle velocity

\(U_{\text{mean}}\) :

Mean wind speed

\(\omega\) :

Angular frequency

\(\omega_{0}\) :

Modal angular frequency of wave spectrum

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Acknowledgements

The authors express their gratitude to the Ministry of Education, Government of India, and the National Institute of Technology, Karnataka, Surathkal, for providing necessary facilities. DK acknowledges the partial support from Ministry of Ports, Shipping and Waterways, India through the research grant no. DW/01013(13)/2/2021.

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The research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Department of Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575025, India

    Binoy Sebastian, D. Karmakar & Manu Rao

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  1. Binoy Sebastian
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  2. D. Karmakar
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  3. Manu Rao
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Contributions

BS: Conceptualization, Methodology, Validation, Writing – original draft, Visualization, Investigation. DK: Conceptualization, Methodology, Supervision, Writing – review & editing. MR: Supervision, Writing – review & editing.

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Correspondence to D. Karmakar.

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Sebastian, B., Karmakar, D. & Rao, M. Coupled dynamic analysis of semi-submersible floating wind turbine integrated with oscillating water column WEC. J. Ocean Eng. Mar. Energy 10, 287–312 (2024). https://doi.org/10.1007/s40722-023-00313-x

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