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Oscillations in Offshore Wind Turbines
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Oscillations in Offshore Wind Turbines

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

Deadline for manuscript submissions: closed (1 January 2024) | Viewed by 2894

Special Issue Editors

Dr. Jesus Enrique Sierra-Garcia

E-Mail Website
Guest Editor
Electromechanical Department, University of Burgos, Burgos, Spain
Interests: mobile robotics; modelling; control; intelligent control; wind turbine control; system; AGVs
Dr. Fares M’zoughi

E-Mail Website
Guest Editor
Automatic Control Group—ACG, Institute of Research and Development of Processes—IIDP, Department of Automatic Control and Systems Engineering, Faculty of Engineering of Bilbao—EIB/BIE, University of the Basque Country—UPV/EHU, Po Rafael Moreno no3, 48013 Bilbao, Spain
Interests: wave energy converters; hybrid ocean platforms; power generation; induction machines; back-to-back converters; automatic control; fuzzy logic control; sliding mode control; artificial neural networks; metaheuristics algorithms
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Special Issue Information

Dear Colleagues,

The growing demand for energy in which the world is currently immersed has led to the search for new energy sources that are clean and do not generate carbon residues. Among them, wind, wave and tidal energies emerge as promising and efficient alternatives. Wind turbines can be on land or have offshore foundations. Offshore wind turbines have a number of advantages over land-based turbines, such as no space limitations and more limited impact on the ecosystem. More recently, near-shore offshore wind turbines have migrated to deep waters, with floating platforms being a promising, cost effective and feasible solution for many countries.

However, they operate in hard ambient conditions that limit their operation and compromise their integrity. In addition to adverse weather conditions, in deep waters, they are subjected to strong waves and sea currents that increase the oscillations and vibrations in their structure, thus, reducing performance and life span. Therefore, the research applied to improve the knowledge about the oscillations in offshore systems, as well as the development of techniques to control them and reduce their effects, would be very beneficial.

Thus, the aim of this Special Issue is to provide a platform for researchers, engineers and industrial professionals from different fields to share their research results and experiences in modelling, analysis and control of oscillations in offshore energy systems. Contributions to this Special Issue are welcome to present and discuss novel methods, algorithms, frameworks, architectures, platforms and applications.

Dr. Jesus Enrique Sierra-Garcia
Dr. Fares M’zoughi
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

  • offshore wind energy systems
  • floating offshore wind turbines
  • floating hybrid energy systems
  • design and modelling of offshore wind platforms
  • wind, wave and tidal load effects
  • mooring system design and analysis
  • structural dynamic response and analysis
  • active, semi-active and passive structural control of offshore wind energy systems
  • control strategies and optimization for floating wind systems
  • numerical and experimental methods for offshore wind systems
  • techno-economic cost analysis of floating offshore plants

Published Papers (2 papers)

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Research

22 pages, 4154 KiB  
Article
Identification of Vibration Modes in Floating Offshore Wind Turbines
by Mikel Serrano-Antoñanazas, Jesús-Enrique Sierra-Garcia, Matilde Santos and María Tomas-Rodríguez
J. Mar. Sci. Eng. 2023, 11(10), 1893; https://doi.org/10.3390/jmse11101893 - 28 Sep 2023
Viewed by 1242
Abstract
Compared to onshore turbines, floating offshore wind turbines (FOWTs) take advantage of the increased availability of offshore wind while causing less environmental impact. However, the strong winds, waves, and currents to which they are subjected trigger oscillations that can cause significant damage to [...] Read more.
Compared to onshore turbines, floating offshore wind turbines (FOWTs) take advantage of the increased availability of offshore wind while causing less environmental impact. However, the strong winds, waves, and currents to which they are subjected trigger oscillations that can cause significant damage to the entire structural system and reduce its useful life. To reduce these loads, active tower damping techniques such as filter banks can be used. These filters must be carefully tuned to block specific vibration frequencies. Therefore, it is essential to analyze the nature of the oscillations in the FOWT and to understand how the frequencies vary in time. This topic is usually approached from a point of view very focused on a specific turbine. What is proposed here is a general method, which can be applied to any type of wind turbine, to automatically study the relationship between vibration frequencies and the degrees of freedom (DOF) of the turbine, which facilitates the design of structural control. Each frequency is associated with the DOF of the FOWT that produces it. This methodology has been successfully validated in simulation experiments with the NREL 5 MW ITI Barge FOWT. Under the wind conditions of the experiments, the main frequency found is 0.605 Hz. This frequency coincides with the 3P theoretical frequency of the FOWT. This proposal may help to design structural control systems able to damp these vibration frequencies with accuracy and efficiency. Full article
(This article belongs to the Special Issue Oscillations in Offshore Wind Turbines)
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12 pages, 2877 KiB  
Article
In Situ Observation of Near-Surface Wind Seasonal Variation on the Southern Coast of Sri Lanka
by Xuancheng Lu, Shuyun Huang, Dongxiao Wang, Yao Luo, Tilak Priyadarshana Gamage and P. B. Terney Pradeep Kumara
J. Mar. Sci. Eng. 2023, 11(9), 1721; https://doi.org/10.3390/jmse11091721 - 01 Sep 2023
Viewed by 1111
Abstract
The characteristics of local surface wind are closely related to the assessment of wind power resources and the oscillation period of offshore wind turbines. In this research, we analyzed near-surface wind observation data from the southern coast of Sri Lanka, comparing the surface [...] Read more.
The characteristics of local surface wind are closely related to the assessment of wind power resources and the oscillation period of offshore wind turbines. In this research, we analyzed near-surface wind observation data from the southern coast of Sri Lanka, comparing the surface wind variation characteristics across different seasons. Through spectral analysis, we discuss the wind stability and oscillation period, aiming to provide information for the management strategies and oscillation issues of offshore wind turbines in the North Equatorial Indian Ocean to ensure their stable operation. Our findings showed that the Indian summer monsoon dominated the seasonal surface wind variation in the southern coast of Sri Lanka. The local monsoon period began in mid-May and ended in mid-October, during which stable southwest winds prevailed with an average maximum 10 m wind speed exceeding 6.0 m/s. In contrast, surface wind was unstable and weaker during autumn and winter. The surface wind speed exhibited a clear diurnal oscillation throughout the year. The wind speed power spectral density exhibited clear peaks at periods of 24 h, 12 h, and 6 h. Full article
(This article belongs to the Special Issue Oscillations in Offshore Wind Turbines)
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