A bidirectional soft-switched DAB-based single-stage three-phase AC-DC converter for V2G application

Dibakar Das, Nathan Weise, Kaushik Basu, Rohit Baranwal, Ned Mohan

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In vehicle-to-grid applications, the battery charger of the electric vehicle (EV) needs to have a bidirectional power flow capability. Galvanic isolation is necessary for safety. An ac-dc bidirectional power converter with high-frequency isolation results in high power density, a key requirement for an on-board charger of an EV. Dual-active-bridge (DAB) converters are preferred in medium power and high voltage isolated dc-dc converters due to high power density and better efficiency. This paper presents a DAB-based three-phase ac-dc isolated converter with a novel modulation strategy that results in: 1) single-stage power conversion with no electrolytic capacitor, improving the reliability and power density; 2) open-loop power factor correction; 3) soft-switching of all semiconductor devices; and 4) a simple linear relationship between the control variable and the transferred active power. This paper presents a detailed analysis of the proposed operation, along with simulation results and experimental verification.

Original languageEnglish (US)
Article number8573905
Pages (from-to)186-199
Number of pages14
JournalIEEE Transactions on Transportation Electrification
Volume5
Issue number1
DOIs
StatePublished - Mar 2019

Keywords

  • Dual active bridge (DAB)
  • high-frequency link
  • single-stage ac-dc converter
  • soft-switching

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