A Methodology to Remove Stator Skew in Small-Medium Size Synchronous Generators via Innovative Damper Cage Designs

Stefano Nuzzo, Michael Galea, Paolo Bolognesi, Gaurang Vakil, Daniel Fallows, Chris Gerada, Neil Brown

Research output: Journal PublicationArticlepeer-review

15 Citations (Scopus)

Abstract

This paper proposes and investigates an innovative methodology that can have a significant impact on the market potential of wound field, small-medium size synchronous generators (SGs). The technique proposed here is aimed at removing the need for the traditional stator skewing that is so commonly used in SGs to achieve acceptable values of voltage total harmonic distortion. To do this, a nonstandard damper cage configuration is proposed that comprises modulation of the damper bars' positioning. An off-the-shelf, 400-kVA generator is used as a benchmark machine. Its rotor is optimized and modified according to the proposed technique. The results of the final machine are then compared to the benchmark machine highlighting the excellent advantages that can be achieved through this technique. A full-scale prototype of the modified generator is then built to experimentally validate the concept. Finally, a detailed analysis on all the performance aspects of the prototype is carried out, to guarantee that the proposed technique has no negative impact whatsoever on the generator's performance.

Original languageEnglish
Article number8437241
Pages (from-to)4296-4307
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number6
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Asymmetrical windings
  • circuital modeling
  • damper windings
  • efficiency
  • genetic algorithms (GA)
  • modulated bars
  • optimizations
  • power quality
  • skewing
  • synchronous generators (SGs)
  • total harmonic distortion (THD)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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