A Novel Method of Suppressing the Inrush Current of Transformers Using a Series-Connected Voltage-Source PWM Converter

Hiroaki Yamada, Toshihiko Tanaka, Shigeyuki Funabiki

Research output: Contribution to journalArticle


This paper proposes a novel method of suppressing the inrush current of transformers. A small-rated voltage-source PWM converter is connected in series to the transformers through a matching transformer. As the connected PWM converter performs a resistor for the source current, no inrush phenomena occurs. The required-ratings of the PWM converter, which performs the damping resistor for the inrush phenomena, is one-four-hundredth as compared to that of the main transformers in single-phase circuits. In three-phase circuits, it is one-nine-hundredth. The basic principle of the proposed method is discussed. Digital computer simulation is implemented to confirm the validity and excellent practicability of the proposed method using the PSCAD/EMTDC. A prototype experimental-model is constructed and tested. The experimental results demonstrate that the proposed method can perfectly suppress the inrush phenomena.

Original languageEnglish
Pages (from-to)674-682
Number of pages9
JournalIEEJ Transactions on Industry Applications
Issue number7
Publication statusPublished - Sep 1 2004
Externally publishedYes



  • core-saturation
  • inrush current
  • re-inrush phenomena
  • series-connected voltage-source PWM converter
  • transforme model

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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