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Direct electric energy conversion system for energy conversion from marine currents
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.
2007 (English)In: Proceedings of the Institution of mechanical engineers. Part A, journal of power and energy, ISSN 0957-6509, E-ISSN 2041-2967, Vol. 221, no 2, 201-205 p.Article in journal (Refereed) Published
Abstract [en]

Direct electric energy conversion without input power regulating system or gearboxes may offer a simpler and thus low cost way of converting the energy of moving water. The proposed electrical system consists of a permanent magnetized direct drive generator, a rectification step, transmission, an inverter, a transformer, and a grid connection. This paper focuses on the generator, and simulations of a 5 kW permanent magnetized direct drive generator have been performed. Operation of the generator at both part load and overloads are calculated and presented. It is found that this direct drive permanent magnetized generator provides a relatively high efficiency for both part load and overload conditions.

Place, publisher, year, edition, pages
2007. Vol. 221, no 2, 201-205 p.
Keyword [en]
marine currents, tidal power, direct drive system, renewable electric energy
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-96612DOI: 10.1243/09576509JPE303ISI: 000246281500008OAI: oai:DiVA.org:uu-96612DiVA: diva2:171249
Available from: 2008-01-11 Created: 2008-01-11 Last updated: 2016-04-07Bibliographically approved
In thesis
1. Low Speed Energy Conversion from Marine Currents
Open this publication in new window or tab >>Low Speed Energy Conversion from Marine Currents
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The focus of this thesis is research on the performance of very low speed direct drive permanent magnet generators for energy conversion from marine and tidal currents. Various aspects involved in the design of these generators and their electromagnetic modelling using the finite element simulations are presented. For a detailed study, a 5 kW prototype generator has been designed and constructed based on finite element based simulations. Several experiments were conducted on the prototype generator. The experimental results were compared with the corresponding case simulations on the designed generator. The differences between the results predicted by the simulations and those predicted by the measurements were less than 10%. The part and overload performance of the generator has been investigated and it is found from both simulations and measurements that the generator is capable to efficiently operate at varying speeds. The tests on the experimental generator were made for speeds between 2 and 16 rpm and for load variations of 0.5 to 2 per unit. In this thesis it is shown that it is possible to design a very low speed direct drive generator for more or less any given marine current site and this is beneficial for projects aiming to develop a technical and economical viable marine current energy conversion system.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 68 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 383
Keyword
Electrical power technology, Direct Drive Generator, Finite Element Method, Marine Current Energy, Synchronous Generator, Permanent Magnet, Tidal Current Energy, Elkraftteknik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:uu:diva-8400 (URN)978-91-554-7063-0 (ISBN)
Public defence
2008-02-01, Häggsalen, Ångströmlaboratory, Lägerhyddsvägen 1, 751 21 Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2008-01-11 Created: 2008-01-11 Last updated: 2010-04-23Bibliographically approved

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Leijon, Mats

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