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Advances in Offshore Wind and Wave Energies
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Advances in Offshore Wind and Wave Energies

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Marine Energy".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 9522

Special Issue Editors

Dr. Pedro Beirão

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Guest Editor
1. Polytechnic of Coimbra, Coimbra Institute of Engineering, Department of Mechanical Engineering, Rua Pedro Nunes—Quinta da Nora, 3030-199 Coimbra, Portugal
2. IDMEC—Mechanical Engineering Institute, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
Interests: wave energy; modeling; control; PLC programming; equipment development
Special Issues, Collections and Topics in MDPI journals
Dr. Mário J. G. C. Mendes

E-Mail Website
Guest Editor
1. Polytechnic Institute of Lisbon, Instituto Superior de Engenharia de Lisboa (ISEL), Mechanical Engineering Department, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisbon, Portugal
2. CENTEC—Centre for Marine Technology and Ocean Engineering, University of Lisbon, Instituto Superior Técnico (IST), Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
Interests: renewable energy; wave energy converters; fault-tolerant control systems; multi-agent systems; soft robotics; digital factories
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The aim of this Special Issue is to collate and publish original research articles covering the latest developments in the field of offshore wind and wave energy. Some potential topics might include—but are not limited to—technological aspects, such as new devices and their designs, modelling, control algorithms and simulation approaches, power optimization, energy harnessing and storage, and grid connection. Environmental and economic aspects will also be considered for inclusion in the Special Issue, for example, those focusing on management, price evolution, and resource prediction. Review or research papers in these areas are both welcome.

Dr. Pedro Beirão
Dr. Mário José Gonçalves Cavaco Mendes
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly 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 2600 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

  • renewable energy
  • wind energy
  • wave energy
  • offshore wind devices
  • wave energy converters
  • modelling
  • control
  • wind and wave energy management

Related Special Issue

Published Papers (5 papers)

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Research

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18 pages, 5108 KiB  
Article
Design and Analysis of a Decoupling Buoyancy Wave Energy Converter
by Pablo Torres-Blanco and José Ángel Sánchez-Fernández
J. Mar. Sci. Eng. 2023, 11(8), 1496; https://doi.org/10.3390/jmse11081496 - 27 Jul 2023
Viewed by 757
Abstract
This study presents a new wave energy converter that operates in two phases. During the first phase, wave energy is stored, raising a mass up to a design height. During the second phase, the mass goes down. When going down, it compresses air [...] Read more.
This study presents a new wave energy converter that operates in two phases. During the first phase, wave energy is stored, raising a mass up to a design height. During the second phase, the mass goes down. When going down, it compresses air that moves a turbine that drives an electrical generator. Because of this decoupling, generators that move much faster than seawater can be used. This allows using “off-the-shelf” electrical generators. The performance of the proposed design was evaluated via simulations. As the device operates in two phases, a different simulation model was built for each phase. The mass-rising simulation model assumes regular waves. The simulation results suggest that energy harvesting is near the theoretical maximum. Mass falling is braked by air compression. Simulations of this system showed oscillatory behavior. These oscillations are lightly damped by the drag against the walls and air. These oscillations translate into generated power. Therefore, smoothing is needed to avoid perturbing the grid. A possible solution, in the case of farms comprising dozens of these devices, is to delay the generation among individual devices. In this manner, the combined generation can be significantly smoothed. Full article
(This article belongs to the Special Issue Advances in Offshore Wind and Wave Energies)
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22 pages, 3953 KiB  
Article
Evaluating the Applicability of Mainstream Wave Energy Converters in the South China Sea
by Yong Wan, Xiaoshun Feng and Wen Zhang
J. Mar. Sci. Eng. 2023, 11(6), 1198; https://doi.org/10.3390/jmse11061198 - 09 Jun 2023
Viewed by 868
Abstract
Based on the past ten years of ERA5 wave field data, this study analyzed the distribution of wave energy resources in the coastal waters of each province around the South China Sea. In view of the single resource evaluation method, a regional classification [...] Read more.
Based on the past ten years of ERA5 wave field data, this study analyzed the distribution of wave energy resources in the coastal waters of each province around the South China Sea. In view of the single resource evaluation method, a regional classification method was established that comprehensively considered the three factors that impact wave energy resource reserves, the suitable water depth of the wave energy conversion device, and the device layout mode that affects energy absorption efficiency. From this information, the locations of key deployment stations around the coastal provinces were determined. Additionally, the CRITIC method was used to build indicators that can comprehensively evaluate the performance of different devices, and the most suitable devices for deployment in the five provinces were identified. The wave energy propagation direction of each key station was analyzed. The results show that the wave energy propagation direction of each station is relatively concentrated, which is convenient since this helps the device absorb and utilize energy more efficiently. Finally, the power generation performance and economic benefits of each key station’s most suitable device were analyzed. This article provides an assessment of the applicability of mainstream wave energy conversion devices in the nearshore area of the South China Sea, which is of great significance for the development and utilization of wave energy resources in the South China Sea’s nearshore waters. It provides a scientific basis for the selection, deployment, operation, and other practical operations of the follow-up devices in the South China Sea, as well as the power generation performance and economic benefits of the devices. Full article
(This article belongs to the Special Issue Advances in Offshore Wind and Wave Energies)
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19 pages, 6320 KiB  
Article
An Evaluation of Marine Renewable Energy Resources Complementarity in the Portuguese Nearshore
by Florin Onea and Eugen Rusu
J. Mar. Sci. Eng. 2022, 10(12), 1901; https://doi.org/10.3390/jmse10121901 - 05 Dec 2022
Cited by 4 | Viewed by 1958
Abstract
The Portuguese nearshore represents a suitable environment for the development of marine energy farms, with recent progress being related to the implementation of the first commercial wave farm or a large scale floating wind project. At the same time, there is also high [...] Read more.
The Portuguese nearshore represents a suitable environment for the development of marine energy farms, with recent progress being related to the implementation of the first commercial wave farm or a large scale floating wind project. At the same time, there is also high solar power in this area that can be extracted; in the near future, the rapid development of floating solar projects all over the world is expected. In this context, the aim of the present work is to identify the complementarity between solar, wind and wave resources based on 10 years of ERA5 data (from 2012 to 2021). The results are provided mainly in terms of spatial maps. The analysis shows that solar and wind power are more significant in the southern part of this region, indicating for each resource an average value of 223 W/m2 for solar and 660 W/m2 for wind. On the other hand, the wave power gradually decreases from north to south, with an average value of 10 kW/m being expected at a distance of 50 km from the shoreline. In terms of complementarity, two scenarios were considered (mild and restrictive), the difference between them being estimated to be around 10%. Several dimensionless indices were defined in order to highlight the correlation between solar, wind and wave conditions, which may be considered as an element of novelty for the target area. In general, higher values (0.5) were noted in the case of the wind-wave and wave-solar combinations, excepting the southern part of Portugal (Algarve) where particular conditions were noted. Finally, the expected power outputs from some relevant technologies were also estimated, including a new concept of the wave energy generator designed for the WindFloat platform. Compared to the solar and wind systems, the performance of the selected wave generation system was quite low, suggesting that other types of wave energy converters would be more appropriate at this moment in the coastal area targeted. Finally, we need to mention that the idea of using multiple resources from a single marine site is an attractive one, while the methodology dedicated to this topic will continuously improve as new technological solutions emerge. Full article
(This article belongs to the Special Issue Advances in Offshore Wind and Wave Energies)
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20 pages, 12363 KiB  
Article
New Wave Energy Converter Design Inspired by the Nenuphar Plant
by Hugo Díaz, José Miguel Rodrigues and C. Guedes Soares
J. Mar. Sci. Eng. 2022, 10(11), 1612; https://doi.org/10.3390/jmse10111612 - 01 Nov 2022
Cited by 3 | Viewed by 2134
Abstract
This paper presents the Nenuphar concept, an innovative wave energy converter designed to use the kinetic and the potential energy of sea waves, based on the motions of seven modules. First, the main characteristics of the Nenuphar and its work principle are presented. [...] Read more.
This paper presents the Nenuphar concept, an innovative wave energy converter designed to use the kinetic and the potential energy of sea waves, based on the motions of seven modules. First, the main characteristics of the Nenuphar and its work principle are presented. Afterwards, the mathematical formulation of its dynamics is introduced and its validation with a simplified device. A specific MATLAB code was developed to determine the dynamics of hinged, multi-directional bodies. Then, the system’s behaviour was analysed under different wave conditions. The system performance was not strongly dependent on the wave characteristics or the device inclination angle. This initial study confirms the Nenuphar as a potential technology to extract energy from waves. Full article
(This article belongs to the Special Issue Advances in Offshore Wind and Wave Energies)
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Review

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25 pages, 4082 KiB  
Review
Progress of Combined Wind and Wave Energy Harvesting Devices and Related Coupling Simulation Techniques
by Feifei Cao, Mingqi Yu, Bing Liu, Zhiwen Wei, Lei Xue, Meng Han and Hongda Shi
J. Mar. Sci. Eng. 2023, 11(1), 212; https://doi.org/10.3390/jmse11010212 - 13 Jan 2023
Cited by 3 | Viewed by 2775
Abstract
The use of combined wind and wave energy harvesting devices (CWWHDs) is an effective way to synergistically capture offshore wind and wave energy. However, the form of combined energy harvesting and coupled simulation techniques limit the development of CWWHDs. This paper classifies the [...] Read more.
The use of combined wind and wave energy harvesting devices (CWWHDs) is an effective way to synergistically capture offshore wind and wave energy. However, the form of combined energy harvesting and coupled simulation techniques limit the development of CWWHDs. This paper classifies the existing CWWHDs based on wave energy converters and offshore wind turbines, summarizes the theoretical background and implementation forms of the numerical simulation of CWWHDs, and focuses on the technical details of wind-wave coupling and multi-body coupling simulation, which fills the gap in the research of the wind-wave coupling and multi-body coupling numerical simulation of CWWHDs. Finally, the current research focus and development direction of CWWHDs and their numerical simulation technology are summarized to provide a reference for the future development and application of CWWHDs and numerical simulation technology. Full article
(This article belongs to the Special Issue Advances in Offshore Wind and Wave Energies)
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