Electromagnetic characteristic analysis of the series transformer in UPFC system

The operation conditions of series transformer in Unified Power Flow Controller (UPFC) system are analyzed, and a shell-type structural scheme is proposed in this paper. Taking into account the nonlinear characteristic and the eddy current effect of the ferromagnetic materials, the effective complex...

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Bibliographic Details
Published inInternational journal of applied electromagnetics and mechanics Vol. 53; no. 3; pp. 469 - 485
Main Authors Wang, Shuaibing, Li, Lin, Xie, Yuqing, Zhao, Guoliang
Format Journal Article
LanguageEnglish
Published London, England SAGE Publications 01.03.2017
Sage Publications Ltd
Subjects
Asymmetry
Bias
Circuits
Computer simulation
Eddy currents
Electric potential
Electromagnetic properties
Ferromagnetic materials
Magnetic permeability
Mathematical models
Power flow
Reactive power
Transformers
asymmetrical DC bias
duality theory
complex permeability
Series transformer
reactive power
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Summary:The operation conditions of series transformer in Unified Power Flow Controller (UPFC) system are analyzed, and a shell-type structural scheme is proposed in this paper. Taking into account the nonlinear characteristic and the eddy current effect of the ferromagnetic materials, the effective complex permeability is adopted to calculate the nonlinear reluctance of the core, and an electromagnetic transient model of the series transformer is presented based on the duality theory of electric circuit and magnetic circuit, which is one key part of the comprehensive simulation model of UPFC. Besides, the improved magnetic circuit method is coupled with the electric circuit to analyze the special three-phase asymmetrical DC bias phenomenon of series transformer. Some experiments about no-load switching and asymmetrical DC bias on a low-voltage series transformer prototype have been done to verify the transient model and the improved magnetic circuit method, respectively. Finally, the reactive power of the no-load series transformer prototype under asymmetrical DC bias is calculated, the results indicate that the variation of the reactive power of series transformer under asymmetrical DC bias becomes more complicated, which increases the difficulty of voltage regulation in UPFC system.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1383-5416
1875-8800
DOI:10.3233/JAE-160064