scholarly journals Retracted: “Kinematic Analysis of the Motion of a Six Degrees of Freedom Wave Energy Converter Based on the Concept of the Stewart-Gough Platform” [ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, Volume 10: Ocean Renewable Energy, Madrid, Spain, June 17–22, 2018, Conference Sponsors: Ocean, Offshore and Arctic Engineering Division, ISBN: 978-0-7918-5131-9. Paper No. OMAE2018-78601, pp. V010T09A047; 10 pages, doi:10.1115/OMAE2018-78601]

2018 ◽  
Author(s):  
ASME
Keyword(s):  
Renewable Energy ◽  
Wave Energy ◽  
Kinematic Analysis ◽  
Degrees Of Freedom ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Six Degrees Of Freedom ◽  
International Conference ◽  
Ocean Renewable Energy ◽  
Stewart Gough Platform

This paper was withdrawn. ASME does not hold the copyright. December 21, 2018. Copyright © 2018 by ASME

Experimental Study the Performance of a Compact Mooring System for a Dual Chamber Floating Oscillating Water Column Device

2020 ◽  
Author(s):  
Sheng Xu ◽  
K. Rezanejad ◽  
Shan Wang ◽  
J. F. M. Gadelho ◽  
C. Guedes Soares
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Degrees Of Freedom ◽  
Wave Energy Converter ◽  
Air Pressure ◽  
Mooring System ◽  
Oscillating Water Column ◽  
Energy Converter ◽  
Six Degrees Of Freedom ◽  
Motion Responses

Abstract A compact mooring system concept is proposed. This novel mooring is composed of submerged buoy and three segments of nylon ropes, which is suitable for the large wave energy converters and wave energy converter array due to its high flexibility and small mooring radius. The performance of this mooring concept was studied experimentally when it was moored to an oscillating water column. The damping of the oscillating water column was modelled by an orifice on top of the chamber. Both regular and irregular head sea wave tests were conducted. In order to study the influence of wave height on system dynamics, two series of regular wave tests with same periods but different wave heights were conducted. An optical tracking system was installed to capture six degrees of freedom motion responses of oscillating water column. The air pressure in the chamber was measured by the air pressure sensor. Two load cells were installed on the top of mooring lines to measure mooring tension time series. Besides, the wave surface elevations inside the chamber were measured by the wave gauges. According to the experimental results, the six degrees of freedom motion responses of floating wave energy converter and mooring tensions are analyzed. Besides, the energy conversion efficiency is evaluated based on the measured data.

Testing the WET-NZ Wave Energy Converter Using the Ocean Sentinel Instrumentation Buoy

2013 ◽  
Vol 47 (4) ◽  
pp. 164-176 ◽  
Author(s):  
Terry Lettenmaier ◽  
Annette von Jouanne ◽  
Ean Amon ◽  
Sean Moran ◽  
Alister Gardiner
Keyword(s):  
Renewable Energy ◽  
New Zealand ◽  
Wave Energy ◽  
Test Site ◽  
Wave Energy Converter ◽  
Department Of Energy ◽  
State University ◽  
Energy Converter ◽  
Private Company ◽  
Research Consortium

AbstractThis paper describes ocean testing of the half-scale Wave Energy Technology-New Zealand (WET-NZ) prototype wave energy converter (WEC) using the Ocean Sentinel instrumentation buoy during a 6-week deployment period in August‐October 2012. These tests were conducted by the Northwest National Marine Renewable Energy Center (NNMREC) at its Pacific Ocean test site off the coast of Newport, Oregon. The WET-NZ is the product of a research consortium between Callaghan Innovation, a New Zealand Crown Entity, and Power Projects Limited (PPL), a Wellington, New Zealand private company. The Oregon deployment was project managed by Northwest Energy Innovations (NWEI), a Portland, OR firm. NNMREC is a Department of Energy sponsored partnership between Oregon State University (OSU), the University of Washington (UW), and the National Renewable Energy Laboratory (NREL). The Ocean Sentinel instrumentation buoy is a 6-m surface buoy, developed in 2012, that provides a stand-alone electrical load, WEC generator control, and data collection for WECs being tested. The Ocean Sentinel was deployed and operated for the first time during the 2012 WET-NZ tests. During these tests, the operation of the WET-NZ was demonstrated and its performance was characterized, while also proving successful deployment and operation of the Ocean Sentinel.

scholarly journals WECANet: The First Open Pan-European Network for Marine Renewable Energy with a Focus on Wave Energy-COST Action CA17105

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1249 ◽  
Author(s):  
Vasiliki Stratigaki
Keyword(s):  
Renewable Energy ◽  
Wave Energy ◽  
Interdisciplinary Approach ◽  
Energy Sector ◽  
Wave Energy Converter ◽  
Energy Resources ◽  
European Network ◽  
Energy Converter ◽  
Cost Action ◽  
Marine Renewable Energy

Growing energy demand has increased interest in marine renewable energy resources (i.e., wave energy, which is harvested through wave energy converter (WEC) arrays. However, the wave energy industry is currently at a significant juncture in its development, facing a number of challenges which require that research re-focuses on a holistic techno-economic perspective, where the economics considers the full life cycle costs of the technology. It also requires development of WECs suitable for niche markets, because in Europe there are inequalities regarding wave energy resources, wave energy companies, national programs and investments. As a result, in Europe there are leading and non-leading countries in wave energy technology. The sector also needs to increase confidence of potential investors by reducing (non-)technological risks. This can be achieved through an interdisciplinary approach by involving engineers, economists, environmental scientists, lawyers, regulators and policy experts. Consequently, the wave energy sector needs to receive the necessary attention compared to other more advanced and commercial offshore energy technologies (e.g., offshore wind). The formation of the first open pan-European network with an interdisciplinary approach will contribute to large-scale WEC array deployment by dealing with the current bottlenecks. The WECANet (Wave Energy Converter Array Network) European COST Action, introduced in September 2018 and presented in this paper, aims at a collaborative and inclusive approach, as it provides a strong networking and collaboration platform that also creates the space for dialogue between all stakeholders in wave energy. An important characteristic of the Action is that participation is open to all parties interested and active in the development of wave energy. Previous activities organised by WECANet core group members have resulted in a number of joint European projects and scientific publications. WECANet’s main target is the equal research, training, networking, collaboration and funding opportunities for all researchers and professionals, regardless of age, gender and country in order to obtain understanding of the main challenges governing the development of the wave energy sector.

scholarly journals A Comparative Study of Metaheuristic Algorithms for Wave Energy Converter Power Take-Off Optimisation: A Case Study for Eastern Australia

2021 ◽  
Vol 9 (5) ◽  
pp. 490
Author(s):  
Erfan Amini ◽  
Danial Golbaz ◽  
Rojin Asadi ◽  
Mahdieh Nasiri ◽  
Oğuzhan Ceylan ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Wave Energy ◽  
Clean Energy ◽  
Search Space ◽  
Wave Energy Converter ◽  
Gray Wolf ◽  
Energy Converter ◽  
Energy Company ◽  
Energy Technologies ◽  
Eastern Australia

One of the most encouraging sorts of renewable energy is ocean wave energy. In spite of a large number of investigations in this field during the last decade, wave energy technologies are recognised as neither mature nor broadly commercialised compared to other renewable energy technologies. In this paper, we develop and optimise Power Take-off (PTO) configurations of a well-known wave energy converter (WEC) called a point absorber. This WEC is a fully submerged buoy with three tethers, which was proposed and developed by Carnegie Clean Energy Company in Australia. Optimising the WEC’s PTO parameters is a challenging engineering problem due to the high dimensionality and complexity of the search space. This research compares the performance of five state-of-the-art metaheuristics (including Covariance Matrix Adaptation Evolution Strategy, Gray Wolf optimiser, Harris Hawks optimisation, and Grasshopper Optimisation Algorithm) based on the real wave scenario in Sydney sea state. The experimental achievements show that the Multiverse optimisation (MVO) algorithm performs better than the other metaheuristics applied in this work.

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