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Linear generator-based wave energy converter model with experimental verification and three loading strategies
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.ORCID iD: 0000-0003-1022-0480
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
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2016 (English)In: IET Renewable Power Generation, ISSN 1752-1416, E-ISSN 1752-1424, Vol. 10, no 3, 349-359 p.Article in journal (Refereed) Published
Abstract [en]

Within the Lysekil wave energy research project at the Swedish west coast, more than ten Wave Energy Converters (WECs) prototypes have been developed and installed in an ocean based test site. Since 2006 various experiments have been conducted and the generated electricity was delivered to shore at a nearby island. While experiments are essential for the development of wave energy converters, theoretical studies and simulations are an important complement – not only in the search for advanced designs with higher efficiency, but also for improving the economic viability of the studied concepts. In this paper a WEC model is presented. The model consists of three subsystems: i) the hydrodynamic source, ii) the linear generator model, and iii) the electrical conversion system. After the validation with the experimental results at the research site, the generator model is connected to three passive load strategies – linear resistive load, passive rectification and resonance circuit. The paper focuses on analysing the operation of the model coupled with three load cases. The results prove that the WEC model correctly simulates the linear generator developed in the Lysekil Project. Moreover, the comparison among different load cases is made and discussed. The results gives an indication of the efficiency of energy production as well as the force ripples and resulting mechanical loads on the wave energy converters.

Place, publisher, year, edition, pages
2016. Vol. 10, no 3, 349-359 p.
Keyword [en]
linear machines; electric generators; wave power generation; ocean waves; power convertors; power grids; power generation economics; hydrodynamics; rectifying circuits; circuit resonance; load (electric); power generation planning; linear generator-based wave energy converter model; experimental verification; loading strategy; ocean-based test site; grid connection; WEC model; economic viability; hydrodynamic source; electrical conversion system; passive load strategy; linear resistive load; passive rectification; resonance circuit; Lysekil Project; energy production efficiency; force ripples; mechanical load
National Category
Energy Systems Ocean and River Engineering
Identifiers
URN: urn:nbn:se:uu:diva-283546DOI: 10.1049/iet-rpg.2015.0117ISI: 000371789100008OAI: oai:DiVA.org:uu-283546DiVA: diva2:919318
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy StorageSwedish Research CouncilSwedish Energy AgencyVINNOVAGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologySwedish Research Council, 621-2009-3417
Available from: 2016-04-13 Created: 2016-04-13 Last updated: 2017-11-30Bibliographically approved
In thesis
1. Numerical Modelling and Mechanical Studies on a Point Absorber Type Wave Energy Converter
Open this publication in new window or tab >>Numerical Modelling and Mechanical Studies on a Point Absorber Type Wave Energy Converter
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Oceans cover two thirds of the Earth’s surface and the energy potential of ocean waves as a renewable energy source is huge. It would therefore be a tremendous achievement if the vast mechanical energy in waves was converted into a form of energy that could be used successfully by society. For years, scientists and engineers have endeavored to exploit this renewable energy by inventing various generators designed to transform wave energy into electrical energy. Generally, this sort of generator is called a Wave Energy Converter (WEC).

In this thesis, the research is based on the WEC developed in the Lysekil Project. The Lysekil Project is led by a research group at Uppsala University and has a test site located on the west coast of Sweden. The project started in 2002. So far, more than ten prototypes of the WEC have been deployed and relevant experiments have been carried out at the test site. The WEC developed at Uppsala University can be categorized as a point absorber. It consists of a direct-drive linear generator connected to a floating buoy. The linear generator is deployed on the seabed and driven by a floating buoy to extract wave energy. The absorbed energy is converted to electricity and transmitted to a measuring station on land.

The work presented in this thesis focuses on building a linear generator model which is able to predict the performance of the Lysekil WEC. Studies are also carried out on the damping behavior of the WEC under the impact of different sea climates. The purpose is to optimize the energy absorption with a specific optimal damping coefficient. The obtained results indicate an optimal damping for the Lysekil WEC which can be used for optimizing the damping control.

Additionally, the impact two central engineering design features (the translator weight and the stroke length) are investigated. The aim is to find a reasonable structural design for the generator which balances the cost and the energy production.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 76 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1443
Keyword
linear generator, point absorber, numerical modelling, power production, optimal damping
National Category
Engineering and Technology
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-305650 (URN)978-91-554-9731-6 (ISBN)
Public defence
2016-12-07, 80101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2016-11-14 Created: 2016-10-20 Last updated: 2016-11-16

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Hong, YueEriksson, MikaelCastellucci, ValeriaBoström, CeciliaWaters, Rafael

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