A novel active power quality compensator topology with DC voltage balancer for electrified railways

Tint Soe Win, Eiji Hiraki, Toshihiko Tanaka

Research output: Contribution to journalArticle

Abstract

This paper proposes a novel active power quality compensator (APQC) topology with a DC voltage balancer for electrified railways. The APQC is composed of a three-leg structure with two common DC capacitors. Two legs perform as two half-bridge inverters, which compensate the unbalanced active, reactive, and harmonic currents on the source side in the traction substation. The third leg controls two common DC capacitor voltages with a small amount of the output currents. Therefore, the current rating of the third leg can be reduced as compared to that of the already proposed three-leg structured APQC. In the control algorithm of the two half-bridge inverters, a strategy based on constant DC capacitor voltage control is used, which does not need any calculation blocks of the unbalanced active, reactive, and harmonic components of the load current to perform the APQC operation. Thus we offer the simplest algorithm for the proposed APQC. The basic principle of the proposed APQC topology with the DC voltage balancer is discussed in detail, and then confirmed by digital computer simulation using the PSIM software. A prototype experimental model is constructed and tested. Experimental results demonstrate that the proposed APQC can achieve balanced and sinusoidal source currents on the primary side of the Scott transformer in traction substations for electrified railways.

Original languageEnglish
Pages (from-to)634-639
Number of pages6
JournalIEEJ Transactions on Electrical and Electronic Engineering
Volume8
Issue number6
DOIs
Publication statusPublished - Nov 2013
Externally publishedYes

Keywords

  • Active power quality compensator
  • Constant DC capacitor voltage control
  • DC voltage balancer
  • Electrified railways
  • Half-bridge inverter
  • Three-leg inverter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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