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Active Current Sharing Control Method for Rotating Thyristor Rectifiers on Brushless Dual-Star Exciters
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.ORCID iD: 0000-0001-8237-3107
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
(English)In: Article in journal (Refereed) Submitted
Abstract [en]

A new high speed response dual-star brushless rotating exciter has been recently proposed, which utilizes two rotating thyristor rectifiers in a hybrid-mode topology. However, dissymmetries tend to occur in large-scale apparatus, which ultimately results in an undesired unbalanced loading of the topology. Moreover, the topology provides a possibility for compensation via asymmetrical firing, which serves as a promising solution to be investigated. This letter proposes an active current sharing adjustment method between the parallel thyristor bridges. The method improves controllability and performance compared with the alternative ”skip firing” approach. In addition, the method serves as an alternative to the conventional current-balancing interphase transformer employed on the rectifier outputs for general large direct current applications.

Keyword [en]
AC generator excitation, asymmetrical firing, hybrid-mode 12-pulse thyristor rectifier, brushless exciters
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-333568OAI: oai:DiVA.org:uu-333568DiVA: diva2:1157157
Available from: 2017-11-15 Created: 2017-11-15 Last updated: 2017-11-20
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