A two-stage AC/DC SST based on modular multilevel converter

Author

Demercil, S.O. ; Praca, Paulo Peixoto ; Barreto, Luiz Henrique Silva Colado ; Almeida Silva, Bruno ; Oliveira, Herminio M. ; Honorio, Dalton A.

Author_Institution

Electr. Eng. Dept. (DEE-CT), Fed. Univ. of Ceara (UFC), Fortaleza, Brazil

fYear

2013

fDate

27-31 Oct. 2013

Firstpage

254

Lastpage

258

Abstract

This paper proposes the use of the modular multilevel converter (MMC) in ac-dc conversion using medium frequency transformers in a two-stage topology with unidirectional switches. The medium frequency link provided by each module of the MMC is used to supply the windings of the transformer. A full-bridge rectifier connected to the dc side supplies the secondary side as the power flow is controlled by the phase-shift angle between the primary and secondary voltages. The resulting topology is fault tolerant since a short-circuit in the dc side causes low additional stress in the semiconductors. The basic description and some simulation results are presented in order to valid the proposal.

Keywords

AC-DC power convertors; fault tolerance; load flow; transformer windings; AC-DC conversion; DC side supplies; MMC; fault tolerant topology; full-bridge rectifier; medium frequency link; medium frequency transformers; modular multilevel converter; phase-shift angle; power flow; primary voltage; secondary voltage; transformer windings; two-stage AC-DC SST; two-stage topology; unidirectional switches; Bridge circuits; Frequency conversion; Power transformers; Switches; Topology; Voltage control; dc distribution systems; medium frequency power transformer; solid-state transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Conference (COBEP), 2013 Brazilian

Conference_Location

Gramado

ISSN

2175-8603

Type

conf

DOI

10.1109/COBEP.2013.6785124

Filename

6785124