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Energies 2016, 9(12), 1056; doi:10.3390/en9121056

Energy Conversion: A Comparison of Fix- and Self-Referenced Wave Energy Converters

Marine and Renewable Energy Ireland, Environment Research Institute, University College Cork, P43 C573 Cork, Ireland
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Academic Editor: Jens Peter Kofoed
Received: 30 July 2016 / Revised: 28 November 2016 / Accepted: 1 December 2016 / Published: 15 December 2016
(This article belongs to the Special Issue Numerical Modelling of Wave and Tidal Energy)
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Abstract

The paper presents an investigation of fix-referenced and self-referenced wave energy converters and a comparison of their corresponding wave energy conversion capacities from real seas. For conducting the comparisons, two popular wave energy converters, point absorber and oscillating water column, and their power conversion capacities in the fixed-referenced and self-referenced forms have been numerically studied and compared. In the numerical models, the device’s power extractions from seas are maximized using the correspondingly optimized power take-offs in different sea states, thus their power conversion capacities can be calculated and compared. From the comparisons and analyses, it is shown that the energy conversion capacities of the self-referenced devices can be significantly increased if the motions of the device itself can be utilized for wave energy conversion; and the self-referenced devices can be possibly designed to be compliant in long waves, which could be a very beneficial factor for device survivability in the extreme wave conditions (normally long waves). In this regards, the self-referenced WECs (wave energy converters) may be better options in terms of wave energy conversion from the targeted waves in seas (frequently the most occurred), and in terms of the device survivability, especially in the extreme waves when compared to the fix-referenced counterparts. View Full-Text
Keywords: wave energy converter; power take-off optimization; WEC deployment; point absorber; oscillating water column wave energy converter; power take-off optimization; WEC deployment; point absorber; oscillating water column
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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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Sheng, W.; Lewis, T. Energy Conversion: A Comparison of Fix- and Self-Referenced Wave Energy Converters. Energies 2016, 9, 1056.

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