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Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis aims to simulate and find out more about the electrical dynamics of a six-phase exciter for hydropower generators. Because ordinary electric circuit-based simulation software only simulate three-phase electrical systems, a FEM-based software is used for the electrical dynamics simulations of the six-phase system. The objective is to analyse the pulsation behaviour of the rectified electrical output on the six-phase system and compare it to the three-phase system. The three-phase system is also simulated with filters with the aim of decreasing the amplitude of the pulsations on the electrical output.

It is expected that an upgraded system from a three-phase system to a six-phase system should double the pulsation frequency on the rectified electrical output. However, the result shows that the rectified electrical output of the six-phase system consists of pulsations with unexpected frequencies. The simulated RL-filter on the three-phase system shows only insignificantly small changes on the rectified electrical pulsation amplitude.

Place, publisher, year, edition, pages
2011. , 39 p.
UPTEC ES, ISSN 1650-8300 ; ES11 024
Keyword [en]
hydropower, generator, exciter, thyristor
Keyword [sv]
vattenkraft, generator, matare, tyristor
National Category
Energy Engineering
URN: urn:nbn:se:uu:diva-166403OAI: diva2:476290
Educational program
Master Programme in Energy Systems Engineering
Available from: 2012-01-12 Created: 2012-01-11 Last updated: 2012-01-12Bibliographically approved

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