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Energies 2018, 11(9), 2332; https://doi.org/10.3390/en11092332

Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off

1
Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden
2
School of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UK
*
Author to whom correspondence should be addressed.
Received: 1 August 2018 / Revised: 24 August 2018 / Accepted: 30 August 2018 / Published: 4 September 2018
(This article belongs to the Section Energy Sources)
Full-Text   |   PDF [2006 KB, uploaded 5 September 2018]   |  

Abstract

An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device shows some beneficial characteristics, making it an interesting option for full scale devices: For similar weights the inertia can be significantly higher than for linear generators, allowing it to operate with natural frequencies close to typical wave frequencies. The influence of the higher inertia on the power absorption is tested using both a numerical simulation and physical wave tank tests. With the increased inertia the PTO is able to absorb more than double the energy of a comparable direct-driven linear generator in some sea states. Moreover, the alternating rotatory generator allows the absorption characteristic to be tuned by changing the inertia and the generator damping. View Full-Text
Keywords: wave energy; power take-off; direct-driven; wave tank test; physical scale model; natural frequency tuning; floating point absorber wave energy; power take-off; direct-driven; wave tank test; physical scale model; natural frequency tuning; floating point absorber
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Thomas, S.; Giassi, M.; Göteman, M.; Hann, M.; Ransley, E.; Isberg, J.; Engström, J. Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off. Energies 2018, 11, 2332.

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