Special Issue "Advanced Analysis and Techniques of Wave Energy Conversion and Integrated Storage"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: 17 November 2021.

Special Issue Editors

Prof. Bora Karayaka
E-Mail Website
Guest Editor
College of Engineering and Technology, Western Carolina University, Cullowhee, NC 28723, USA
Interests: wave energy conversion; energy storage; electrical machines
Dr. Nathan Michael Tom
E-Mail Website
Guest Editor
National Renewable Energy Laboratory, 15013 Denver W Pkwy, Golden, CO 80401, USA
Interests: marine hydrodynamics; marine energy standards development; control system design

Special Issue Information

Dear Colleagues,

Wave energy converter (WEC) technologies that capture the vast power of ocean waves have been developing as a strong supplement in the world’s renewable energy portfolio. The infrastructure evolving with the increasing presence of offshore wind systems can also act as an enabler for the accelerated deployment of these technologies for the utility scale market. However, several major challenges such as cost, conversion efficiency, and reliability remain and delay the commercialization of WEC devices in the renewable generation market. Nevertheless, there are new market opportunities emerging in support of the Blue Economy which provide unique end user needs that WEC technologies can be well suited to meet. Therefore, the guest editors of this Special Issue invite paper contributions from the R&D community that help to address these important challenges and opportunities.  

Special topics of interest include but are not limited to:

  • Control strategies for wave power smoothing and dispatching;
  • Development of advanced power-take off (PTO) systems;
  • High speed unidirectional rotational energy conversion;
  • Novel gearing/coupling mechanisms;
  • Wave energy storage and grid integration (batteries, supercapacitors, flywheels, etc.);
  • Hybrid renewable energy frameworks that integrate WEC systems;
  • WEC applications and designs that can support the Blue Economy (ocean observations, aquaculture, desalination, etc.).

Prof. Bora Karayaka
Dr. Nathan Michael Tom
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wave energy
  • cost reduction
  • wave power smoothing
  • energy storage
  • unidirectional rotational operation
  • control strategies
  • hybrid systems

Published Papers (2 papers)

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Research

Article
Investigations into Balancing Peak-to-Average Power Ratio and Mean Power Extraction for a Two-Body Point-Absorber Wave Energy Converter
Energies 2021, 14(12), 3489; https://doi.org/10.3390/en14123489 - 11 Jun 2021
Viewed by 522
Abstract
The power harnessed by wave energy converters (WECs) in oceans is highly variable and, therefore, has a high peak-to-average power (PTAP) ratio. To minimize the cost of a WEC power take off (PTO) system, it is desirable to reduce the PTAP ratio while [...] Read more.
The power harnessed by wave energy converters (WECs) in oceans is highly variable and, therefore, has a high peak-to-average power (PTAP) ratio. To minimize the cost of a WEC power take off (PTO) system, it is desirable to reduce the PTAP ratio while maximizing the mean power extracted by WECs. The important issue of how PTAP ratio reduction measures (such as adding an inertia element) can affect the mean power extracted in a reference model has not been thoroughly addressed in the literature. To investigate this correlation, this study focuses on the integration of the U.S. Department of Energy’s Reference Model 3, a two-body point absorber, with a slider-crank WEC for linear-to-rotational conversion. In the first phase of this study, a full-scale numerical model was developed that predicts how PTO system parameters, along with an advanced control algorithm, can potentially affect the proposed WEC’s PTAP ratio as well as the mean power extracted. In the second phase, an appropriate scaled-down model was developed, and extracted power results were successfully validated against the full-scale model. Finally, numerical and hardware-in-the-loop (HIL) simulations based on the scaled-down model were designed and conducted to optimize or make trade-offs between the operational performance and PTAP ratio. The initial results with numerical and HIL simulations reveal that gear ratio, crank radius, and generator parameters substantially impact the PTAP ratio and mean power extracted. Full article
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Article
REFOS: A Renewable Energy Multi-Purpose Floating Offshore System
Energies 2021, 14(11), 3126; https://doi.org/10.3390/en14113126 - 27 May 2021
Cited by 1 | Viewed by 431
Abstract
The present paper deals with the development of a multi-purpose floating tension leg platform (TLP) concept suitable for the combined offshore wind and wave energy resources exploitation, taking into account the prevailing environmental conditions at selected locations along the European coastline. The examined [...] Read more.
The present paper deals with the development of a multi-purpose floating tension leg platform (TLP) concept suitable for the combined offshore wind and wave energy resources exploitation, taking into account the prevailing environmental conditions at selected locations along the European coastline. The examined Renewable Energy Multi-Purpose Floating Offshore System (REFOS) platform encompasses an array of hydrodynamically interacting oscillating water column (OWC) devices, moored through tensioned tethers as a TLP platform supporting a 10 MW wind turbine (WT). The system consists of a triangular platform supported by cylindrical floaters, with the WT mounted at the deck’s center and the cylindrical OWC devices at its corners. Details of the modelling of the system are discussed and hydro-aero-elastic coupling between the floater; the mooring system; and the WT is presented. The analysis incorporates the solutions of the diffraction; the motion- and the pressure-dependent radiation problems around the moored structure, along with the aerodynamics of the WT into an integrated design approach validated through extensive experimental hydrodynamic scaled-down model tests. The verified theoretical results attest to the importance of the WT loading and the OWC characteristics on the dynamics of the system. Full article
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