A Three-Phase Bidirectional AC/DC Converter With Y-Δ Connected Transformers

This paper proposes a three-phase bidirectional ac/dc converter with Y-Δ connected transformers. The converter achieves both buck-boost ac/dc bidirectional conversion and electrical isolation with the single-stage structure. By introducing three dc-dc transformers, the total power is distributed and...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 31; no. 12; pp. 8115 - 8125
Main Authors Ling Gu, Ke Jin
Format Journal Article
LanguageEnglish
Published IEEE 01.12.2016
Subjects
AC-DC power converters
Bidirectional ac/dc converter
Integrated circuits
Microgrids
Prototypes
Rectifiers
single-stage structure
Stress
SVPWM
Switches
Y–Δ connected transformers
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Summary:This paper proposes a three-phase bidirectional ac/dc converter with Y-Δ connected transformers. The converter achieves both buck-boost ac/dc bidirectional conversion and electrical isolation with the single-stage structure. By introducing three dc-dc transformers, the total power is distributed and the current stress of the rectifier stage decreases. The Y-Δ connected transformers provide extra step-down conversion ratio and facilitate the converters' application in buck conversion. The circuit derivation, operation principles, and control strategy with the SVPWM algorithm are presented. A 3-kW prototype with 380-V dc and a 1.6-kW prototype with 48-V dc were built in the lab and experimental results verify the theoretical analysis well.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2517647