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Generator upgrade potential using new tools and high voltage technology
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
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2004 In: Journal on Hydropower and Dams, Vol. 3, 104-108 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. Vol. 3, 104-108 p.
URN: urn:nbn:se:uu:diva-94695OAI: oai:DiVA.org:uu-94695DiVA: diva2:168644
Available from: 2006-09-01 Created: 2006-09-01Bibliographically approved
In thesis
1. Electric Energy Conversion Systems: Wave Energy and Hydropower
Open this publication in new window or tab >>Electric Energy Conversion Systems: Wave Energy and Hydropower
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electric energy conversion is an important issue in today's society as our daily lives largely depend on the supplies of energy. Two energy sources are studied for conversion in the present thesis, ocean waves and hydropower. The work focuses on the generator and the transmission of its output to the electric grid.

Different approaches have been used, over the years, to convert the energy in ocean waves, and the method presently used is based on a point absorber (buoy) directly coupled to a linear generator on the seabed. A varying alternating voltage is induced with such configuration, where both the amplitude and the frequency changes continuously. The target is to connect several units in a farm, and thereby decrease the fluctuations in power production. This is shown to be possible to accomplish with a rectifier connected to each generator. Transmission systems can be designed with converters and transformers to connect the farm to the electric grid onshore. Several aspects of the concept are considered as well as interconnection issues. Analytical calculations verified by finite element simulations and measured data are used to model the behaviour of a linear generator. A series expanded expression for the ideal no-load flux and EMF (electromotive force) is derived, which can be developed into an analytical transmission design tool.

Hydropower has been used for more than a century. Today many of the stations from the mid 1900's are up for refurbishment. Studies with finite element calculations show that a higher electric efficiency can be obtained with a high voltage cable wound generator.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 59 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 202
Engineering physics, Ocean wave power, renewable energy, linear generator, farm simulation, Teknisk fysik
urn:nbn:se:uu:diva-7081 (URN)91-554-6617-6 (ISBN)
Public defence
2006-09-22, Siegbahnsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Available from: 2006-09-01 Created: 2006-09-01 Last updated: 2013-07-31Bibliographically approved

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