Improved damper cage design for salient-pole synchronous generators

Nuzzo, Stefano; Degano, Michele; Galea, Michael; Gerada, C.; Gerada, David; Brown, N.L.

Abstract

© 2016 IEEE. The benefits of implementing a damper winding in salient-pole synchronous generators are widely known and well consolidated. It is also well known that such a winding incurs extra losses in the machine due to a number of reasons. In order to improve the overall efficiency and performance of classical salient-pole, wound field synchronous generators that employ the traditional damper cage, an improved amortisseur winding topology that reduces the inherent loss is proposed and investigated in this paper. This is essential in order to meet modern power quality requirements and to improve the overall performance of such "classical" machines. The new topology addresses the requirements for lower loss components without compromising the acceptable values of the output voltage total harmonic distortion and achieves this by having a modulated damper bar pitch. As vessel for studying the proposed concept, a 4-MVA salient-pole synchronous generator is considered. A finite element model of this machine is first built and then validated against experimental results. The validated model is then used to investigate the proposed concept with an optimal solution being achieved via the implementation of a genetic algorithm optimization tool. Finally, the performance of the optimized machine is compared to the original design both at a steady state and transient operating conditions.

Citation

Nuzzo, S., Degano, M., Galea, M., Gerada, C., Gerada, D., & Brown, N. (2017). Improved damper cage design for salient-pole synchronous generators. IEEE Transactions on Industrial Electronics, 64(3), 1958-1970. https://doi.org/10.1109/TIE.2016.2619321

• Journal Article Type: Article
• Acceptance Date: Sep 20, 2016
• Online Publication Date: Oct 20, 2016
• Publication Date: Mar 1, 2017
• Deposit Date: Nov 10, 2016
• Publicly Available Date: Nov 10, 2016
• 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: 64
• Issue: 3
• Pages: 1958-1970
• DOI: https://doi.org/10.1109/TIE.2016.2619321
• Keywords: shock absorbers, salient-pole synchronous generator, asymmetric rotor winding, damper cage design, harmonic analysis, iron losses calculation
• Public URL: https://nottingham-repository.worktribe.com/output/822450
• Publisher URL: http://ieeexplore.ieee.org/document/7600356/
• Additional Information: (c) 2016 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.
• Contract Date: Nov 10, 2016