scholarly journals Offshore Wind and Wave Energy Complementarity in the Greek Seas Based on ERA5 Data

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1360
Author(s):  
Kimon Kardakaris ◽  
Ifigeneia Boufidi ◽  
Takvor Soukissian
Keyword(s):  
Wave Energy ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Energy Converter ◽  
Energy Potential ◽  
Marine Monitoring ◽  
Wave Measurements ◽  
Statistical Measures ◽  
Event Based

In this work, 20 years (2000–2019) of ERA5 wave and wind data are analyzed and evaluated for the Greek Seas by means of in-situ measurements derived from the POSEIDON marine monitoring system. Four different statistical measures were used at six locations, where in-situ wind and wave measurements are available from oceanographic buoys. Furthermore, the ERA5 wind and wave datasets were utilized for the estimation of the available wind and wave energy potential for the Greek Seas, as well as for the assessment of complementarity and synergy between the two resources. In this respect, an event-based approach was adopted. The spatial distribution of the available wind and wave energy potential resembles qualitatively and quantitatively the distributions derived from other reanalysis datasets. Locations with high synergy and complementarity indices were identified taking into account water depth. Finally, taking into consideration a particular offshore wind turbine power curve and the power matrix of the PELAMIS wave energy converter, the estimation of the combined energy potential on a mean annual basis is performed.

scholarly journals Hydrodynamic investigation on an OWC wave energy converter integrated into an offshore wind turbine monopile

2020 ◽  
Vol 162 ◽  
pp. 103731 ◽  
Author(s):  
Yu Zhou ◽  
Dezhi Ning ◽  
Wei Shi ◽  
Lars Johanning ◽  
Dongfang Liang
Keyword(s):  
Wind Turbine ◽  
Wave Energy ◽  
Wave Energy Converter ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Energy Converter

Proof of Concept of a Novel Hybrid Wind-Wave Energy Converter

2018 ◽  
Author(s):  
Carlos Perez-Collazo ◽  
Deborah Greaves ◽  
Gregorio Iglesias
Keyword(s):  
Wave Energy ◽  
Wind Wave ◽  
Physical Modelling ◽  
Wave Energy Converter ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Proof Of Concept ◽  
Energy Converter ◽  
Wave Energy Converters ◽  
The University

In a global scenario of climate change and raising threats to the marine environment, a sustainable exploitation of offshore wind and wave energy resources is not only crucial for the consolidation of both industries, but also to provide a reliable and accessible source of renewable energy. In this context, and with the shared challenge for both industries to reduce costs, the combination of wind and wave technologies has emerged. In particular, this research deals with a novel hybrid system that integrates an oscillating water column, wave energy converter, with an offshore wind turbine substructure. In this paper, the novel hybrid wind-wave energy converter is studied in a three steps process. First, assessing a preliminary concept by means of a concept development methodology for hybrid wind-wave energy converters. Secondly, an OWC WEC sub-system is defined, on the basis of the results from the first step. Finally, the proof of concept of the WEC sub-system is carried out by means of a physical modelling test campaign at the University of Plymouth’s COAST laboratory.

The Potential for Combining Floating Wind Turbines With Point Absorbing Wave Energy Converters

2021 ◽  
Author(s):  
David M. Skene ◽  
Nataliia Sergiienko ◽  
Boyin Ding ◽  
Benjamin Cazzolato
Keyword(s):  
Wind Turbine ◽  
Frequency Domain ◽  
Wave Energy ◽  
Two Dimensions ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Specific Design ◽  
Energy Converter ◽  
Point Absorber ◽  
Wave Energy Converters

Abstract The potential for coupling a cylindrical point absorber type wave energy converter (WEC) to a 5MW spar type floating offshore wind turbine is investigated. The wind and WEC system is modelled in the frequency domain and in two dimensions under the simplifying assumption that wind and waves propagate in the same direction. Coupling of the bodies is considered with respect to all theoretical combinations that might be achieved rather than a single specific design. Results are analysed with respect to the maximum power that the WEC coupling can achieve. It is shown that for mild waves the WEC can theoretically produce power in the range of 0.2 to 0.6 MW, its optimal dimensions are such that the draft and radius are approximately 18.8 m, and that obtaining this power tends to marginally amplify the pitch of the spar.

scholarly journals Finite Element Modelling and In Situ Modal Testing of an Offshore Wind Turbine

2018 ◽  
Vol 6 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Erfan Asnaashari ◽  
Andy Morris ◽  
Ian Andrew ◽  
Wolfgang Hahn ◽  
Jyoti K. Sinha
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Finite Element Modelling ◽  
Modal Testing ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Element Modelling

scholarly journals Study of the Bearing Capacity of Stiffened Tall Offshore Wind Turbine Towers during the Erection Phase

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5102
Author(s):  
Yu Hu ◽  
Jian Yang ◽  
Charalampos Baniotopoulos
Keyword(s):  
Wind Energy ◽  
Bearing Capacity ◽  
Wind Turbine ◽  
Structural Response ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Nonlinear Buckling ◽  
Wind Turbine Towers ◽  
Nonlinear Buckling Analysis

Offshore wind energy is a rapidly maturing renewable energy technology that is poised to play an important role in future energy systems. The respective advances refer among others to the monopile foundation that is frequently used to support wind turbines in the marine environment. In the present research paper, the structural response of tall wind energy converters with various stiffening schemes is studied during the erection phase as the latter are manufactured in modules that are assembled in situ. Rings, vertical stiffeners, T-shaped stiffeners and orthogonal stiffeners are considered efficient stiffening schemes to strengthen the tower structures. The loading bearing capacity of offshore monopile wind turbine towers with the four types of stiffeners were modeled numerically by means of finite elements. Applying a nonlinear buckling analysis, the ultimate bearing capacity of wind turbine towers with four standard stiffening schemes were compared in order to obtain the optimum stiffening option.

scholarly journals A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

2020 ◽  
Vol 8 (2) ◽  
pp. 93 ◽  
Author(s):  
Domenico Curto ◽  
Alessia Viola ◽  
Vincenzo Franzitta ◽  
Marco Trapanese ◽  
Fabio Cardona
Keyword(s):  
Wave Energy ◽  
Magnetic Force ◽  
Vertical Motion ◽  
Small Islands ◽  
Sea Waves ◽  
Energy Converter ◽  
Energy Potential ◽  
Linear Generator ◽  
Three Phase ◽  
Sea Wave

The paper investigates an innovative ironless linear generator, installable inside a wave energy converter, in order to produce electricity from sea waves. This energy source is considered strategic for the future, especially in small islands; however, this technology is still far from the commercial phase. Considering the wave energy potential of the Mediterranean Sea, a first prototype of the electrical linear generator was realized at the Department of Engineering of Palermo University. This machine can be run by a two-floating buoys system, able to produce a linear vertical motion. The main goal of this paper is the investigation of the advantages and the disadvantages of the utilization of steel materials to realize the stator of linear generators. Thus, starting from the prototype, the authors analyzed the effects produced by the replacement of steel in the stator with a non-magnetic material. For comparison, the authors evaluated the amplitude of no-load voltages, using a three-phase connection scheme, and the amplitude of the magnetic force produced by the interaction of magnets with the stator. Both aspects were evaluated through numerical simulations and mathematical models.

scholarly journals Control Strategies for Floating Offshore Wind Turbine: Challenges and Trends

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1185 ◽  
Author(s):  
Tom Salic ◽  
Jean Frédéric Charpentier ◽  
Mohamed Benbouzid ◽  
Marc Le Boulluec
Keyword(s):  
Wind Turbine ◽  
Control Point ◽  
Production Costs ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Strong Wind ◽  
Energy Potential ◽  
Structural Problems ◽  
Partial Load ◽  
Floating Offshore Wind Turbines

The offshore wind resource has huge energy potential. However, wind turbine floating structures have to withstand harsh conditions. Strong wind and wave effects combine to generate vibrations, fatigue, and heavy loads on the structure and other elements of the wind turbine. These structural problems increase maintenance requirements and risk of failure, while reducing availability and energy production. Another challenge for wind energy is to reduce production costs in order to be competitive with other alternatives. From the control point of view, the objective of lowering costs can be achieved by operating the turbine close to its optimum point of operation under partial load, guaranteeing reliability by reducing structural loads and regulating the power generated in strong wind regimes. In this typical and challenging context, this paper proposes a critical state-of-the-art review, discussing challenges and trends on floating offshore wind turbines control.

Development of Floating Offshore Wind Turbine and the Mooring System

2013 ◽  
Vol 790 ◽  
pp. 634-637
Author(s):  
Xue Liang Zhao ◽  
Wei Ming Gong
Keyword(s):  
Wind Turbine ◽  
Research Work ◽  
Experimental Tests ◽  
Offshore Wind ◽  
Future Research ◽  
Offshore Wind Turbine ◽  
Mooring System ◽  
Floating Offshore Wind Turbine ◽  
Energy Demands

The offshore wind turbine, especially the floating offshore wind turbine in the deep sea is a perspective technology in the context of increasing energy demands. Mooring system, as an important unit of the floating offshore wind turbine is emphasized. The methods of in-situ test and the laboratory experimental tests are reviewed. Some new testing methods are discussed. The most commonly used anchor systems are explored. The paper aims to present some future research work that is important for the development of the floating offshore wind turbine technology.

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