Maximum Efficiency Tracking of an Integrated Two-Staged AC-DC Converter Using Variable DC-Link Voltage

Ayan Mallik, Alireza Khaligh

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

This paper presents an approach to achieve maximum conversion efficiency of a two-staged-cascaded ac-dc converter. In this study, the integrated ac-dc converter consists of a three-phase boost-type power factor correction rectifier and a phase-shifted full-bridge dc-dc converter. The detailed loss modeling of the integrated stage implies that the total power loss varies in a nonmonotonic fashion with intermediate dc-link voltage. In order to ensure maximum conversion efficiency, an optimum dc-link voltage level can be set depending on the load power level. A comparison between the efficiency variation under two different cases is carried out with extensive mathematical analyses: 1) fixed dc bus and 2) variable dc-bus voltage control. In addition, the experimental results obtained from a 6-kW-integrated ac-dc hardware prototype show a unity power factor along with a peak efficiency of 97.2%, which is 2.5% more than the fixed dc-link control approach.

Original languageEnglish (US)
Pages (from-to)8408-8421
Number of pages14
JournalIEEE Transactions on Industrial Electronics
Volume65
Issue number11
DOIs
StatePublished - Nov 2018
Externally publishedYes

Keywords

  • AC-DC
  • integrated
  • maximum efficiency
  • power factor correction
  • three-phase
  • variable DC link

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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