Experimental study on the unified power flow controller

Junya Matsuki*, Yasuhiro Hayashi, Shunsuke Kitajima, Masahiro Takahashi, Kenji Murata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper presents the results of experimental study on the performance of a Unified Power Flow Controller (UPFC), one of the FACTS (Flexible AC Transmission Systems) controllers. A laboratory-scale UPFC was manufactured and installed on a laboratory electric power system to investigate its multifunctional capabilities as a power flow controller. The UPFC consists of two 4.5-kVA, 200-V back-to-back voltage-sourced converters, labeled "Converter 1" and "Converter 2," operated from a common DC link provided by a DC storage capacitor of 380 V. It can provide independent control of both the real and reactive power How in the line. Tests were performed to examine the capabilities of the UPFC, under one-machine connected to an infinite-bus system. Steady-state responses under various kinds of operating conditions were measured and analyzed.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number2
Publication statusPublished - 2007 Nov 15
Externally publishedYes


  • DC link
  • Electric power system
  • Power flow control
  • Steady-state stability
  • UPFC

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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