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Damper cage loss reduction and no-load voltage THD improvements in salient-pole synchronous generators

Nuzzo, Stefano; Galea, Michael; Gerada, C.; Gerada, David; Mebarki, Abdelslam; Brown, N.L.

Authors

Stefano Nuzzo

MICHAEL GALEA Michael.Galea@nottingham.ac.uk
Professor of Electrical Machines and Drives

DAVID GERADA D.Gerada@nottingham.ac.uk
Principal Research Fellowin Electrical Machines

Abdelslam Mebarki

N.L. Brown



Abstract

Salient-pole synchronous generators (SG) have a long history of utilization as reliable power generation systems. Important aspects of such generators include a high power-to-weight ratio, high efficiency and a low cost per kVA output [1]. Another critical aspect is the requirement for very low harmonic content in the output voltage. Hence, it is very important to be able to model and predict the no-load voltage waveform in an accurate manner in order to be able to satisfy standards requirements, such as the permissible total harmonic distortion (THD). Also, at steady-state conditions, parasitic voltages are induced in the damper bars which lead to a current flow with associated power losses and an increase in temperatures. This paper deals with an in-detail analysis of a 4 MVA SG, whose operation is studied and compared with experimental results for validation purposes. The same platform is then used to propose innovative solutions to the existing design and operational challenges of the machine aimed at reducing ohmic loss in the damper cage and improving the output voltage THD, without reverting to disruptive techniques such as rotor and/or stator skewing.

Citation

Nuzzo, S., Galea, M., Gerada, C., Gerada, D., Mebarki, A., & Brown, N. (2016). Damper cage loss reduction and no-load voltage THD improvements in salient-pole synchronous generators

Conference Name 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
End Date Apr 21, 2016
Acceptance Date Feb 16, 2016
Publication Date Apr 21, 2016
Deposit Date Nov 8, 2016
Publicly Available Date Nov 8, 2016
Peer Reviewed Peer Reviewed
Keywords salient-pole synchronous generators, THD, total harmonic distortion, rotors, stators
Public URL http://eprints.nottingham.ac.uk/id/eprint/38589
Publisher URL http://digital-library.theiet.org/content/conferences/10.1049/cp.2016.0203
Related Public URLs http://conferences.theiet.org/pemd/about/index.cfm
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
Additional Information Published in: 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), Glasgow, UK, 19-21 April 2016. ISBN: 9781785611889, doi:10.1049/cp.2016.0203

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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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