A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators

Yu Ling He, Zhi Jie Zhang, Wen Qiang Tao, Xiao Long Wang, David Gerada, Chris Gerada, Peng Gao

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)

Abstract

This research investigates the detection of the detailed static air-gap eccentricity position (SAGE) at both the ends of nonsalient pole synchronous generators (SG). Differently from the previous studies, the detection method proposed does not necessitate the installation of invasive sensors inside the generator and instead, it is based on two groups of symmetrically distributed search coils placed at both endsides outside the generator. The root-mean-square (rms) value comparison in electromotive forces of the search coils is then employed to assess the exact SAGE position of each end-side. Numerical 3-D finite element calculation together with an experimental campaign on a two-pole 3000 r/min CS-5 prototype SG validates the effectiveness of the proposed method. It is shown that the maximum assessment error by using the four external search coils at each end is 15.1%, while by setting more coils, the error can be significantly reduced. Since this proposed method has no need to install invasive search coils inside the generator, it is more convenient for field testing and helps improve the cost performance of the online SAGE condition monitoring.

Original languageEnglish
Article number9126123
Pages (from-to)7535-7544
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number8
DOIs
Publication statusPublished - Aug 2021
Externally publishedYes

Keywords

  • Condition monitoring
  • external search coil
  • static air-gap eccentricity (SAGE)
  • synchronous generator (SG)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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