Advances in Offshore Wind Energy

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312).

Deadline for manuscript submissions: closed (30 July 2019) | Viewed by 3320

Special Issue Editor

Environmental Hydraulics Institute of Cantabria “IHCantabria”, Univ. Cantabria, C/Isabel Torres n15, 39011 Santander, Cantabria, Spain
Interests: offshore wind energy; offshore engineering; marine renewable energies; seakeeping analysis; mooring system design; floating offshore wind platform design
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Special Issue Information

Dear Colleagues,

Offshore wind energy, and in particular deep waters offshore wind, is one of the most challenging and promising sources of renewable energy. In fact, given the vast volume of untapped wind energy resource available in deep waters, floating wind energy platforms are currently being developed as an alternative to fixed marine foundations. In fact, according to the report “Floating Offshore Wind Vision Statement” published by Wind Europe in June 2017, 80% of marine wind energy potential is located at water depths beyond 60 meters, representing a total resource of 4000 GW. The scenario described is analogous both in USA and Japan, and hence, this is the main reason behind the interest in the development of floating wind technologies.

However, harvesting wind energy in deep waters is still a technological challenge. During the last years the technical feasibility of different floating technologies has been proven at laboratory or prototype scale, successfully in some of the cases. Although these projects have contributed to take a significative step forward in the sector, the room for improvement is still large.

This Special Issue attempts to summarize the latest advances on floating offshore wind. Sharing experience and knowledge is the best way to leverage and foster one of the most inspiring engineering challenges nowadays.

Papers that deal with wind energy in the following areas are invited:

  • Platform design and optimization
  • Floating Platform hydrodynamics
  • Physical experiments on Floating Wind Turbines
  • Coupled Numerical models
  • Mooring and anchoring systems applied to floating offshore wind
  • Dynamic power cable and connectors for floating platforms
  • Installation and Decommissioning strategies
  • Platform performance versus wind turbine control algorithm
Dr. Raúl Guanche García
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. 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

  • Numerical models
  • Physical experiments
  • Mooring systems
  • Coupled models
  • Wind turbine control integration
  • Dynamic power cables
  • Floating platforms
  • Seakeeping
  • Hydrodynamics

Published Papers (1 paper)

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Research

20 pages, 3175 KiB  
Article
Linear Quadratic Optimal Control of a Spar-Type Floating Offshore Wind Turbine in the Presence of Turbulent Wind and Different Sea States
by Roberto Luiz Ramos
J. Mar. Sci. Eng. 2018, 6(4), 151; https://doi.org/10.3390/jmse6040151 - 07 Dec 2018
Cited by 10 | Viewed by 2933
Abstract
This paper presents the design of a linear quadratic (LQ) optimal controller for a spar-type floating offshore wind turbine (FOWT). The FOWT is exposed to different sea states and constant wind turbulence intensity above rated wind speed. A new LQ control objective is [...] Read more.
This paper presents the design of a linear quadratic (LQ) optimal controller for a spar-type floating offshore wind turbine (FOWT). The FOWT is exposed to different sea states and constant wind turbulence intensity above rated wind speed. A new LQ control objective is specified for the floater-turbine coupled control, in accordance with standard requirements, to reduce both rotor speed fluctuations and floater pitch motion in each relevant sea state compared with a baseline proportional-integral (PI) controller. The LQ weighting matrices are selected using time series of the wind/wave disturbances generated for the relevant sea states. A linearized state-space model is developed, including the floater surge/pitch motions, rotor speed, collective blade pitch actuation, and unmeasured environmental disturbances. The wind disturbance modeling is based on the Kaimal spectrum and aerodynamic thrust/torque coefficients. The wave disturbance modeling is based on the Pierson–Moskowitz spectrum and linearized Morison equation. A high-fidelity FOWT simulator is used to verify the control-oriented model. The simulation results for the OC3-Hywind FOWT subjected to turbulent wind show that a single LQ controller can yield both rotor speed fluctuation reduction of 32–72% and floater pitch motion reduction of 22–44% in moderate to very rough sea states compared with the baseline PI controller. Full article
(This article belongs to the Special Issue Advances in Offshore Wind Energy)
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