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Floating Offshore Wind Turbines
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Floating Offshore Wind Turbines

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 (15 December 2021) | Viewed by 16462

Special Issue Editor

Prof. Dr. Finn Gunnar Nielsen

E-Mail Website
Guest Editor
Head Bergen Offshore Wind Centre (BOW), Geophysical Institute, University of Bergen, P.O.Box 7803, 5020 Bergen, Norway
Interests: offshore wind energy; floating support structures; dynamic response due to wind; waves and controller actions; marine hydrodynamic and marine operations

Special Issue Information

Dear Colleagues,

Energies is planning a new Special Issue on the topic of “Floating Offshore Wind Turbines”.

Energy from floating offshore wind turbines is in many future energy scenarios assumed to have a major role in electricity supply toward 2050. Many important research tasks must first be addressed for this to take place, though. In this Special Issue of Energies, we want to focus on the dynamics response of multimegawatt floating offshore wind turbines subjected to loads wind, waves, and current. In particular the following issues are of interest: The effect of different formulations of the turbulent wind field under various atmospheric stability conditions; interaction between the dynamic response to wind and waves and the importance of the turbine control system; the combined action of waves and current; the effect of wave-induced motions on power output and floater behavior in the wake of an upstream turbine. Further, issues related to mooring of floating offshore wind turbines are of special interest. We sincerely hope you have interest in and are able to submit an article to this Special Issue.

Prof. Dr. Finn Gunnar Nielsen
Guest Editor

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. 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 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

  • Floating wind turbines
  • Dynamic response
  • Wind, wave, and current loads
  • Effect of controller
  • Wind turbine wakes
  • Mooring

Published Papers (6 papers)

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Editorial

Jump to: Research

6 pages, 185 KiB  
Editorial
Perspectives and Challenges Related Offshore Wind Turbines in Deep Water
by Finn Gunnar Nielsen
Energies 2022, 15(8), 2844; https://doi.org/10.3390/en15082844 - 13 Apr 2022
Cited by 7 | Viewed by 1824
Abstract
In the coming decades, energy from offshore wind turbines is expected to be an important energy source in electric power systems [...] Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)

Research

Jump to: Editorial

43 pages, 8969 KiB  
Article
Use of Kane’s Method for Multi-Body Dynamic Modelling and Control of Spar-Type Floating Offshore Wind Turbines
by Saptarshi Sarkar and Breiffni Fitzgerald
Energies 2021, 14(20), 6635; https://doi.org/10.3390/en14206635 - 14 Oct 2021
Cited by 11 | Viewed by 3271
Abstract
This paper demonstrates the use of Kane’s method to derive equations of motion for a spar-type floating offshore wind turbine taking into account the flexibility of the members. The recently emerged Kane’s method reduces the effort required to derive equations of motion for [...] Read more.
This paper demonstrates the use of Kane’s method to derive equations of motion for a spar-type floating offshore wind turbine taking into account the flexibility of the members. The recently emerged Kane’s method reduces the effort required to derive equations of motion for complex multi-body systems, making them simpler to model and more readily solved by computers. Further, the installation procedure of external vibration control devices on the wind turbine using Kane’s method is described, and the ease of using this method has been demonstrated. A tuned mass damper inerter (TMDI) is installed in the tower for illustration. The excellent vibration mitigation properties of the TMDI are also presented in this paper. Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)
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22 pages, 60494 KiB  
Article
Numerical and Physical Modeling of a Tension-Leg Platform for Offshore Wind Turbines
by Daniel Walia, Paul Schünemann, Hauke Hartmann, Frank Adam and Jochen Großmann
Energies 2021, 14(12), 3554; https://doi.org/10.3390/en14123554 - 15 Jun 2021
Cited by 10 | Viewed by 2856
Abstract
In order to tap the world wide offshore wind resources above deep waters, cost efficient floating platforms are inevitable. Tension-Leg Platforms (TLPs) could enable that crucial cost reduction in floating wind due to their smaller size and lighter weight compared to spars and [...] Read more.
In order to tap the world wide offshore wind resources above deep waters, cost efficient floating platforms are inevitable. Tension-Leg Platforms (TLPs) could enable that crucial cost reduction in floating wind due to their smaller size and lighter weight compared to spars and semi-submersibles. The continuous development of the GICON®-TLP is driven by computer-aided engineering. So-called aero-hydro-servo-elastic coupled simulations are state-of-the-art for predicting loads and simulating the global system behavior for floating offshore wind turbines. Considering the complexity of such simulations, it is good scientific praxis to validate these numerical calculations by use of scaled model testing. This paper addresses the setup of the scaled model testing as carried out at the offshore basin of the École Centrale de Nantes, as well as the numerical model for the GICON®-TLP. The results of dedicated decay tests of the scaled model are used to validate the computational model at the first stage and to determine the natural frequencies of the system. Besides different challenges to the scaled model during the survey, it was possible to take these difficulties into account when updating the numerical model. The results show good agreements for the tank tests and the numerical model. Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)
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22 pages, 4474 KiB  
Article
Research on a Comprehensive Maintenance Optimization Strategy for an Offshore Wind Farm
by Yang Lu, Liping Sun and Yanzhuo Xue
Energies 2021, 14(4), 965; https://doi.org/10.3390/en14040965 - 11 Feb 2021
Cited by 6 | Viewed by 1957
Abstract
Offshore wind is considered a crucial part in the future energy supply. However, influenced by weather conditions, the maintenance of offshore wind turbine system (OWTs) equipment is challenged by poor accessibility and serious failure consequences. It is necessary to study the optimized strategy [...] Read more.
Offshore wind is considered a crucial part in the future energy supply. However, influenced by weather conditions, the maintenance of offshore wind turbine system (OWTs) equipment is challenged by poor accessibility and serious failure consequences. It is necessary to study the optimized strategy of comprehensive maintenance for offshore wind farms, with consideration of the influences of incomplete equipment maintenance, weather accessibility and economic relevance. In this paper, a Monte Carlo algorithm-improved factor is presented to simulate the imperfect preventive maintenance activity, and waiting windows were created to study the accessibility of weather conditions. Based on a rolling horizon approach, an opportunity group maintenance model of an offshore wind farm was proposed. The maintenance correlations between systems and between equipment as well as breakdown losses, maintenance uncertainty, and weather conditions were taken into account in the model, thus realizing coordination of maintenance activities of different systems and different equipment. The proposed model was applied to calculate the maintenance cost of the Dafengtian Offshore Wind Farm in China. Results proved that the proposed model could realize long-term dynamic optimization of offshore wind farm maintenance activities, increase the total availability of the wind power system and reduce total maintenance costs. Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)
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22 pages, 5180 KiB  
Article
Numerical Study on Sectional Loads and Structural Optimization of an Elastic Semi-Submersible Floating Platform
by Yuliang Liu and Takeshi Ishihara
Energies 2021, 14(1), 182; https://doi.org/10.3390/en14010182 - 31 Dec 2020
Cited by 9 | Viewed by 2314
Abstract
This study investigates the sectional loads on an elastic semi-submersible platform for a 2 MW FOWT (floating offshore wind turbine) used in the Fukushima demonstration project. A water tank test is firstly carried out with an elastic model to study the dynamic responses [...] Read more.
This study investigates the sectional loads on an elastic semi-submersible platform for a 2 MW FOWT (floating offshore wind turbine) used in the Fukushima demonstration project. A water tank test is firstly carried out with an elastic model to study the dynamic responses and sectional loads of the platform in regular and irregular waves. Numerical simulations are then performed using multiple hydrodynamic bodies connected by elastic beams. The dynamic responses of the elastic model are compared to those of a rigid model to clarify the influence of the structural stiffness on the platform motion and mooring tension. The predicted sectional loads on the deck, brace and pontoon by the proposed nonlinear hydrodynamic models show good agreement with the experimental data obtained from the water tank test and a simplified formula is proposed to evaluate the distribution of the moments on the platform. Finally, the structural optimization of the elastic semi-submersible platform is conducted. The sectional moments and fatigue loadings on the pontoons are significantly reduced using the strut between the pontoons since the horizontal wave loads on the side column are dominant and the vertical wave loads acting on the platform are relatively small due to the deep draft. Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)
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22 pages, 7264 KiB  
Article
Dynamic Response Analysis of a Semi-Submersible Floating Wind Turbine in Combined Wave and Current Conditions Using Advanced Hydrodynamic Models
by Takeshi Ishihara and Yuliang Liu
Energies 2020, 13(21), 5820; https://doi.org/10.3390/en13215820 - 6 Nov 2020
Cited by 15 | Viewed by 3111
Abstract
In this study, advanced hydrodynamic models are proposed to predict dynamic response of a floating offshore wind turbine (FOWT) in combined wave and current conditions and validated by laboratory and full-scale semi-submersible platforms. Firstly, hydrodynamic coefficient models are introduced to evaluate the added [...] Read more.
In this study, advanced hydrodynamic models are proposed to predict dynamic response of a floating offshore wind turbine (FOWT) in combined wave and current conditions and validated by laboratory and full-scale semi-submersible platforms. Firstly, hydrodynamic coefficient models are introduced to evaluate the added mass and drag coefficients in a wide range of Reynolds numbers. An advanced hydrodynamic model is then proposed to calculate the drag force of cylinder in combined wave and current conditions. The proposed model is validated by the water tank tests in the current-only, wave-only and current-wave conditions and is used to investigate the effect of current on the dynamic response of FOWT. Finally, the full-scale semi-submersible platform used in the Fukushima demonstration project is investigated. It is found that the predicted dynamic responses of platform by the proposed hydrodynamic models are improved by the directional spreading function of the sea wave spectrum and show favorable agreement with the field measurement. Full article
(This article belongs to the Special Issue Floating Offshore Wind Turbines)
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