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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A3: Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 17908

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Special Issue Editors

Dr. Maurizio Collu

E-Mail Website
Guest Editor

Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G1 1XQ, UK
Interests: wind energy; mooring systems; aerodynamics; hydrodynamics; optimization
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Liang Li

E-Mail Website
Guest Editor

College of Engineering, Ocean University of China, Qingdao 266100, China
Interests: marine hydrodynamics; offshore renewable energy; reliability & survivability; wave energy control

Special Issue Information

Dear Colleagues,

Offshore wind energy is abundant, with a great potential contribution to the global goal of net zero emissions. To further reduce the levelized cost of energy, the offshore wind sector is moving to the deep-water zone, and large-sized wind turbines with high power production capacity have been deployed. This brings particular challenges to the design and analysis of offshore wind turbines. To tackle these challenges, the offshore wind sector is making continuous progress in structure design, control strategies, manufacturing materials, installation methods, etc. This Special Issue aims to create a forum for both academia and industry where the most recent achievements and progress on offshore wind turbines can be exchanged. We are inviting original submissions reporting new analysis methods or findings regarding all aspects of offshore wind energy. Topics of interest in this Special Issue include, but are not limited to, the following:

Innovative concept design and technology;
Foundation and mooring system;
Aero-hydro-servo-elastic analysis;
Validation and code-to-code comparison;
Wave–structure interaction/soil–structure interaction;
Electrical engineering of wind power;
New manufacturing material;
Condition monitoring;
Reliability and survivability;
Wind turbine control;
Load mitigation;
Rotor and blade;
Drivetrain dynamics;
Field measurement and model test;
Wind farm;
Wind energy resource assessment;
Installation, operation and maintenance, lifetime extension, decommissioning and recycling;
Integration of offshore wind with other renewable energies;
Application of AI in wind energy.

We look forward to receiving your contributions.

Dr. Maurizio Collu
Prof. Dr. Liang Li
Guest Editors

Manuscript Submission Information

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Keywords

offshore wind energy
offshore wind turbine
blade and rotor
generator and drivetrain
aero-hydro-servo-elastic
model test
field measurement

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Published Papers (5 papers)

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Research

27 pages, 12290 KiB

Open AccessArticle

A CFD Study of Vortex-Induced Motions of a Semi-Submersible Floating Offshore Wind Turbine

by Yuanchuan Liu, Dunjie Ge, Xinglan Bai and Liang Li

Energies 2023, 16(2), 698; https://doi.org/10.3390/en16020698 - 6 Jan 2023

Cited by 3 | Viewed by 1977

Abstract

Vortex-induced motion (VIM) is a critical issue for floating structures made of one or more columns, due to its significant impacts on their operational stability. Supported by column-type floating platforms, floating offshore wind turbines (FOWTs) may also experience large-amplitude VIM responses in current flow. Existing research on FOWTs has mostly focused on their wind/wave induced responses, yet less attention has been paid to their responses in current flow. In this paper, the VIM of the OC4 semi-submersible FOWT platform is studied numerically over a wide range of flow velocity. Three incidence angles, i.e., 0°, 90°, and 180°, are considered and the effect of current incidence on platform VIM is analysed. Results show that the so-called lock-in phenomenon is present and that a large transverse response amplitude of more than 0.3D persists until V_r = 30, with its maximum reaching over 0.8D at V_r = 8. Meanwhile, the transverse response amplitude for cases with the incidence angle of 180° is generally smaller, with a narrower lock-in regime, than those under the other two incidence scenarios. Flow field visualisation reveals that upstream vortices continuously interact with the downstream side column when the incidence angle turns to 180°, impacting the vortex shedding process and consequently fluid forces of the downstream column. Full article

(This article belongs to the Special Issue Recent Advances in Offshore Wind Turbines)

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18 pages, 1704 KiB

Open AccessArticle

Multicriteria Decision Approach to the Design of Floating Wind Farm Export Cables

by Hugo Díaz and C. Guedes Soares

Energies 2022, 15(18), 6593; https://doi.org/10.3390/en15186593 - 9 Sep 2022

Cited by 5 | Viewed by 2033

Abstract

This paper addresses subsea electric cable routing using the application of decision support systems combined with the experts’ knowledge. The methodology is successfully applied to a case study on the Spanish coast. The ranking method calculates the multiple criteria weights, and the weighted product method determines the most suitable space. The environmental criteria, with a weight of 61.4%, exceed the significance of other essential criteria in the study based on experts’ considerations. These rankings are input into the model to extract the suitable spaces to deploy the underwater cable. The final result accurately highlights an optimal route in alignment with the experts’ preferences. Full article

(This article belongs to the Special Issue Recent Advances in Offshore Wind Turbines)

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14 pages, 5538 KiB

Open AccessArticle

Generic Upscaling Methodology of a Floating Offshore Wind Turbine

by Jeffrey Wu and Moo-Hyun Kim

Energies 2021, 14(24), 8490; https://doi.org/10.3390/en14248490 - 16 Dec 2021

Cited by 7 | Viewed by 3770

Abstract

This study presents a generic method to upscale a semi-submersible substructure and tower-nacelle-blade for a floating offshore wind turbine from 5 MW to 15 MW and beyond. The effects of upscaling the column radius and/or distance of the floating base are investigated, and a comparison is made with a 15 MW reference design. It is found that scaling column radius increases the mass of the platform and the heave natural period, while scaling column distance raises the center of gravity and metacentric height of the floating system and slightly decreases the heave natural period. The 15 MW reference design addresses these issues through design changes that increase the ballast mass to lower the center of gravity, and increase the added mass to raise the heave natural period. Finally, a method for estimating the scaling of platform parameters with different assumptions is proposed. Full article

(This article belongs to the Special Issue Recent Advances in Offshore Wind Turbines)

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19 pages, 3502 KiB

Open AccessArticle

Life Cycle Assessment of a Barge-Type Floating Wind Turbine and Comparison with Other Types of Wind Turbines

by Nurullah Yildiz, Hassan Hemida and Charalampos Baniotopoulos

Energies 2021, 14(18), 5656; https://doi.org/10.3390/en14185656 - 8 Sep 2021

Cited by 13 | Viewed by 6134

Abstract

The intensive increase of global warming every year affects our world negatively and severely. The use of renewable energy sources has gained importance in reducing and eliminating the effect of global warming. To this end, new technologies are being developed to facilitate the use of these resources. One of these technological developments is the floating wind turbine. In order to evaluate the respective environmental footprint of these systems, a life cycle assessment (LCA) is herein applied. In this study, the environmental impact of floating wind turbines is investigated using a life cycle assessment approach and the results are compared with the respective ones of onshore and jacket offshore wind turbines of the same power capacity. The studied floating wind turbine has a square foundation that is open at its centre and is connected to the seabed with a synthetic fibre-nylon anchorage system. The environmental impact of all life cycles of such a structure, i.e., the manufacture, the operation, the disposal, and the recycling stages of the wind turbines, has been evaluated. For these floating wind turbines, it has been found that the greatest environmental impact corresponds to the manufacturing stage, whilst the global warming potential and the energy payback time of a 2 MW floating wind turbine of a barge-type platform is higher than that of the onshore, the jacket offshore (2 MW) and the floating (5 MW) wind turbines on a sway floating platform. Full article

(This article belongs to the Special Issue Recent Advances in Offshore Wind Turbines)

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26 pages, 6652 KiB

Open AccessArticle

Modelling Yawed Wind Turbine Wakes: Extension of a Gaussian-Based Wake Model

by De-Zhi Wei, Ni-Na Wang and De-Cheng Wan

Energies 2021, 14(15), 4494; https://doi.org/10.3390/en14154494 - 25 Jul 2021

Cited by 15 | Viewed by 2469

Abstract

Yaw-based wake steering control is a potential way to improve wind plant overall performance. For its engineering application, it is crucial to accurately predict the turbine wakes under various yawed conditions within a short time. In this work, a two-dimensional analytical model is proposed for far wake modeling under yawed conditions by taking the self-similarity assumption for the streamwise velocity deficit and skewness angle at hub height. The proposed model can be applied to predict the wake center trajectory, streamwise velocity, and transverse velocity in the far-wake region downstream of a yawed turbine. For validation purposes, predictions by the newly proposed model are compared to wind tunnel measurements and large-eddy simulation data. The results show that the proposed model has significantly high accuracy and outperforms other common wake models. More importantly, the equations of the new proposed model are simple, the wake growth rate is the only parameter to be specified, which makes the model easy to be used in practice. Full article

(This article belongs to the Special Issue Recent Advances in Offshore Wind Turbines)

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