Improvement of three-phase unbalance due to connection of dispersed generator by damper windings of synchronous generator

Junya Matsuki, Hisao Taoka, Yasuhiro Hayashi, Shigeru Iwamoto, Akihiro Daikoku

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2 Citations (Scopus)


It is well known in the numerical simulations of a synchronous generator that the damper winding contributes to suppressing three-phase circuit unbalance in power systems. However, an experimental study has not been performed yet. In this paper, we verify experimentally the suppression of three-phase unbalance by the damper windings. In order to simulate the three-phase unbalance, a 470-W dispersed generator of single-phase two-line type was connected to a three-phase laboratory-scale power system that included a 6-kVA synchronous generator. We measured and analyzed line voltages and currents as well as damper bar currents both with and without the dispersed generator. The influence of damper windings on the unbalance of the three-phase circuit was also investigated. The results show that the damper winding contributes to improving the three-phase unbalance.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number1
Publication statusPublished - 2014 Jan 1



  • armature current
  • damper current
  • damper windings
  • dispersed generator
  • three-phase unbalance

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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