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Analysis, modelling and design considerations for the excitation systems of synchronous generators

Nuzzo, Stefano; Galea, Michael; Gerada, C.; Brown, Neil

Authors

Stefano Nuzzo

Michael Galea michael.galea@nottingham.ac.uk

C. Gerada chris.gerada@nottingham.ac.uk

Neil Brown ezanb2@exmail.nottingham.ac.uk



Abstract

The traditional generating set is usually comprised of a classical, wound-field, salient-pole or cylindrical rotor synchronous generator, excited by a separate smaller machine, via a rotating, uncontrolled diode rectifier. The effects of the commutation processes of the diode bridge are often overlooked and neglected. However due to the uncontrolled nature of this process, the rectified voltage available at the main generator’s rotor terminals can be significantly lower than the expected value. This is especially true for low-to-medium power rated systems.
In this paper, a detailed investigation of these aspects is done and an accurate voltage drop prediction model is then proposed. The model is validated with finite element analysis and with experimental results for a particular low-medium rated generating system in the 400kVA power range. The validated tool is then integrated into an innovative design tool, which first performs an analytical pre-sizing procedure and then utilizes a genetic algorithm approach to identify an optimal excitation system design, aimed at minimizing the voltage drop ensuing from the diode commutations, with minimum impact on the overall efficiency.

Journal Article Type Article
Publication Date Apr 30, 2018
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 65
Issue 4
APA6 Citation Nuzzo, S., Galea, M., Gerada, C., & Brown, N. (2018). Analysis, modelling and design considerations for the excitation systems of synchronous generators. IEEE Transactions on Industrial Electronics, 65(4), doi:10.1109/TIE.2017.2756592
DOI https://doi.org/10.1109/TIE.2017.2756592
Keywords Excitation Systems, Synchronous Generators, Diode Commutations, Rotating Rectifier
Publisher URL http://ieeexplore.ieee.org/abstract/document/8049315/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information (c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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