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Construction, testing and verification of a brushless excitation system with wireless control of the field current in a synchronous generator.
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.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Konstruktion, provning och verifiering av ett bortslöst magnetiseringssystem med trådlös styrning av fältströmmen i en synkrongenerator. (Swedish)
Abstract [en]

Synchronous generators have been used in hydropower from more than a century where, traditionally, the field current is transferred to the rotor using slip rings and carbon brushes. There are some major disadvantages following the use static excitation; regular and expensive maintenance, as well as a source of carbon dust which, due to buildup, may cause short circuits. To avoid these problems associated with slip ring exciter systems, a system that use induction to transfer power to the rotor could be used instead.

Systems that utilize brushless excitation today usually regulates the current by controlling the magnetization of the exciter stator, which is comparably slower than their static counterparts. In order to allow for swift regulation of the field current from a brushless exciter, required power electronics and controllers have to be present on the rotor shaft instead. The aim of this project is to start investigating if commercially available products, which are originally indented to be used in a stationary environment, could accomplish this.

The results from this study shows that it is possible to use such products to control the field current. The components were found to withstand the exposure of high g-forces and vibrations, albeit only during the relatively small amount of time in which rotary testing was performed. As such there is no certainty that the components would remain functional for the considerably longer time that any commercial use would require them to.

Place, publisher, year, edition, pages
2018. , p. 28
Series
UPTEC E, ISSN 1654-7616 ; 18 002
Keywords [en]
Brushless excitation, synchronous generator, bluetooth, torque ripple
Keywords [sv]
Borstlös matning, synkrongenerator, blåtand, momentpulsationer
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-341021OAI: oai:DiVA.org:uu-341021DiVA, id: diva2:1180626
External cooperation
Svea Power
Educational program
Master Programme in Electrical Engineering
Supervisors
Examiners
Available from: 2018-02-12 Created: 2018-02-06 Last updated: 2018-02-26Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
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  • nn-NB
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  • Other locale
More languages
Output format
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