Title :
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
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;
Conference_Titel :
Power Electronics Conference (COBEP), 2013 Brazilian
Conference_Location :
Gramado
DOI :
10.1109/COBEP.2013.6785124
