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Experimental Measurement of Lateral Force in a Submerged Single Heaving Buoy Wave Energy Converter
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The search for new solutions for the generation of energy is becoming more and more important for our future. Big arguments and disagreements on e.g. the questions of gas transport or the dependence on energy supplied by other countries raise demands on the development of new forms of alternative energy resources. Wave power is one of the main sources of renewable energy due to the high power density stored in ocean waves.

Nevertheless, the dynamic forces of waves are so large that serious questions popped up on how to design a system which could work even in an unfavourable wave climate or could at least retain working capabilities after big storms without significant damages.

This thesis studies the reliability of the mechanical parts of a linear direct driven permanent magnet generator. The results of offshore experiment where strain gauge sensors instrumented on the capsule and the inner framework structure are presented. Stress estimation analyses using strain gauges are carried out. A method for measuring forces and moments in the mechanical structure of the WEC is developed.

Evaluation of the lateral force acting on the outer structure is a key factor for the design and construction of the WEC. A method for the measurement of the lateral force acting on the capsule has been developed.

A study of the inclination angle between the Wave Energy Converter and the floating buoy has been carried out.

The aim of this work is to contribute to the development of wave energy conversion system, and especially to the estimation of structural loads which are important for the survivability of the system under hard sea states.

This work is a step that may influence future design of wave energy devices in terms of material aspect, survivability in a hard wave climate and cost-effective renewable energies.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2012. , 99 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 886
Keyword [en]
Wave energy converter, Tight mooring system, Offshore measurement, Strain gauge, Estimation of stress, Lateral force, Inclination angle, Snatch load
National Category
Energy Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-159519ISBN: 978-91-554-8240-4 (print)OAI: oai:DiVA.org:uu-159519DiVA: diva2:459943
Public defence
2012-02-03, Häggsalen, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2012-01-12 Created: 2011-10-03 Last updated: 2012-01-16Bibliographically approved
List of papers
1. Catch the wave to electricity: The Conversion of Wave Motions to Electricity Using a Grid-Oriented Approach
Open this publication in new window or tab >>Catch the wave to electricity: The Conversion of Wave Motions to Electricity Using a Grid-Oriented Approach
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2009 (English)In: IEEE Power and Energy Magazine, ISSN 1540-7977, Vol. 7, no 1, 50-54 p.Article in journal (Refereed) Published
Abstract [en]

The ocean are largely an untapped source of energy. However, compared to other energies, power fluctuations for ocean waves are small over longer periods of time. This paper present a grid-oriented approach to electricity production from ocean waves, utilizing a minimal amount of mechanical components.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-112949 (URN)10.1109/MPE.2008.930658 (DOI)000262015100004 ()
Available from: 2010-01-22 Created: 2010-01-22 Last updated: 2017-01-25Bibliographically approved
2.
The record could not be found. The reason may be that the record is no longer available or you may have typed in a wrong id in the address field.
3. Estimation of Stress in the Inner Framework Structure of a Single Heaving Buoy Wave Energy Converter
Open this publication in new window or tab >>Estimation of Stress in the Inner Framework Structure of a Single Heaving Buoy Wave Energy Converter
2012 (English)In: IEEE Journal of Oceanic Engineering, ISSN 0364-9059, E-ISSN 1558-1691, Vol. 37, no 2, 309-317 p.Article in journal (Refereed) Published
Abstract [en]

This paper details a method for strain measurements in the inner framework structure of the single heaving buoy Wave Energy Converter (WEC). This type of the WEC consists of a linear direct drive generator placed on the sea floor and connected to the floating buoy through the connection line.

The study focuses on estimation of stress in the inner framework structure of the WEC using strain measurements in material. Stress in ocean structures is as important as maximum stress.The offshore experiment was made at the Lysekil research site a few kilometers from the Swedish west coast.Stresses had the maximum value when the translator hit an end stop. Interesting observations were made: compressive stress occurred in the framework crossbar at a sea state of 1.32 m waves, but both compressive and tensile stress occurred at a sea state of 3.2 m waves.

A computational procedure employs good results. Error estimation is calculated and represented. This work is a step that may influence future design of wave energy devices in terms of material aspect, survivability in a hard wave climate and cost-effective renewable energies.

Keyword
Calibration, Generators, Sea measurements, Strain, Strain measurement, Stress, Voltage measurement, ocean waves, stress measurement, tensile strength, wave power generation, WEC consists, compressive stress, floating buoy, inner framework structure, linear direct drive generator, single heaving buoy wave energy converter, strain measurements, stress estimation, tensile stress, Estimation of stress, wave energy converter (WEC)
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:uu:diva-159512 (URN)10.1109/joe.2012.2188614 (DOI)
Available from: 2011-10-03 Created: 2011-10-03 Last updated: 2017-12-08Bibliographically approved
4. Determining the service life of a steel wire under a working load in the Wave Energy Converter (WEC)
Open this publication in new window or tab >>Determining the service life of a steel wire under a working load in the Wave Energy Converter (WEC)
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2009 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Honolulu, Hawaii: , 2009
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-113297 (URN)
Conference
Conference on Ocean, Offshore and Arctic Engineering (OMAE 2009)
Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2016-04-14Bibliographically approved
5. Temperature measurements in a linear generator and marine substation for wave power
Open this publication in new window or tab >>Temperature measurements in a linear generator and marine substation for wave power
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2012 (English)In: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 134, no 2, 021901- p.Article in journal (Refereed) Published
Abstract [en]

This paper analyzes temperature measurements acquired in the offshore operation of a wave energy converter array. The three directly driven wave energy converters have linear generators and are connected to a marine substation placed on the seabed. The highly irregular individual linear generator voltages are rectified and added on a common dc-link and inverted to 50 Hz to facilitate future grid-connection. The electrical power is transmitted to shore and converted to heat in a measuring station. The first results of temperature measurements on substation components and on the stator of one of the linear generators are presented based on operation in linear and in nonlinear damping. The results indicate that there might be some convective heat transfer in the substation vessel. If high power levels are extracted from the waves, this has to be considered when placing components in the substation vessel in order to avoid heating from neighboring components. The results also indicate that the temperature increase in the linear generator stator is very small. Failure due to excessive heating of the stator winding polyvinyl chloride cable insulation is unlikely to occur even in very energetic sea states. Should this conclusion be incorrect, the thermal conductivity between the stator and the hull of the wave energy converter could be enhanced. Another suggested alteration is to lower the resistive losses by reducing the linear generator current density.

Keyword
convection, linear machines, machine insulation, machine windings, offshore installations, power convertors, stators, substations, temperature measurement, wave power generation
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-140113 (URN)10.1115/1.4004629 (DOI)000308596500021 ()
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2017-12-11Bibliographically approved
6. Description of a torus shaped buoy for wave energy point absorber
Open this publication in new window or tab >>Description of a torus shaped buoy for wave energy point absorber
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2010 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-142504 (URN)
Conference
Renewable Energy 2010, 27 June - 2 July, Pacifico Yokohama, Japan
Available from: 2011-01-14 Created: 2011-01-14 Last updated: 2015-01-07Bibliographically approved
7. The Lysekil Wave Power Project: Status Update
Open this publication in new window or tab >>The Lysekil Wave Power Project: Status Update
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2008 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-97846 (URN)
Available from: 2008-11-21 Created: 2008-11-21 Last updated: 2014-04-29Bibliographically approved
8. Sensors and Measurements Inside the Second and Third Wave Energy Converter at the Lysekil Research Site.
Open this publication in new window or tab >>Sensors and Measurements Inside the Second and Third Wave Energy Converter at the Lysekil Research Site.
2011 (English)Conference paper, Published paper (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-162252 (URN)
Conference
Conference
Available from: 2011-11-28 Created: 2011-11-28 Last updated: 2016-04-19
9. Lysekil Research Site, Sweden: A status update
Open this publication in new window or tab >>Lysekil Research Site, Sweden: A status update
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2011 (English)In: 9th European Wave and Tidal Energy Conference, Southampton, UK, 2011, 2011Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-160039 (URN)
Conference
9th European Wave and Tidal Energy Conference, Southampton, UK, 5-9 September 2011
Available from: 2011-10-13 Created: 2011-10-13 Last updated: 2017-01-25
10. A wave power unit
Open this publication in new window or tab >>A wave power unit
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2009 (English)Patent (Other (popular science, discussion, etc.))
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-140112 (URN)
Patent
WO 2010/085188 (2010-07-29)
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2016-04-14Bibliographically approved

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  • asciidoc
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