Reduction of Three-phase Voltage Unbalance Subject to Special Winding Connections of Two Single-Phase Distribution Transformers of a Microgrid System Using a Designed D-STATCOM Controller

Li Wang, Wei Sheng Liu, Chuan Chieh Yeh, Chien Hsiang Yu, Xiu Yu Lu, Bing Lin Kuan, Hong Yi Wu, Anton V. Prokhorov

Research output: Contribution to journalArticle

1 Citation (Scopus)


The U-V or V-V winding connections of two single-phase distribution transformers are widely utilized in distribution systems to deliver power to various three-phase and/or single-phase loads. Such special winding connections of distribution transformers can cause three-phase voltage unbalance in distributions systems, which could also lead to unexpected trip of ground relay, extra power losses on distribution-system lines, reduced operating efficiency of induction-motor loads, etc. This paper proposes a distribution static synchronous compensator (D-STASTCOM) to effectively improve the voltage unbalance of a distribution system connected with a microgrid system. The studied microgrid system contains various renewable-energy resources, a diesel-engine generator, and three distribution transformers with U-V and/or V-V winding connections. The simulation results show that the proposed D-STATCOM with the designed controller can effectively reduce voltage unbalance of the distribution system connected with the studied microgrid system when the distribution transformers have U-V and/or V-V winding connections.

Original languageEnglish
Pages (from-to)2002-2011
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number3
Publication statusAccepted/In press - 22 Dec 2017



  • Automatic voltage control
  • distribution static synchronous compensator
  • distribution transformer
  • Electrical engineering
  • Generators
  • Mathematical model
  • microgrid system
  • Microgrids
  • U-V/V-V winding connections
  • Voltage unbalance
  • Windings

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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