Power Loss Analysis of a Novel Modular Multilevel Converter Based on Semi-full-bridge Sub-module with SiC-MOSFET Switched Capacitors

Chen Xu, Lei Lin, Kai Hu

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

This paper presents a novel modular multilevel converter (MMC) whose sub-module (SM) is of semi-full bridge structure with SiC-MOSFET switched capacitors. Compared with conventional half-and full-bridge (H FB) hybrid MMC, the proposed capacitor-switching semi-full-bridge (CS-SFB) MMC has the same DC fault ride through capability due to the unchanged positive and negative output voltage levels. The CS-SFB MMC not only possesses the sub-module consistency characteristic similarly as SFB SM, but also it has low power loss characteristic on account of CS technique. The currents of some Si-IGBTs and SiC-MOSFETs are half of the arm current, thus the conduction loss is reduced. Combined with the fast recovery characteristic of SiC-diodes, the switching loss can be reduced simultaneously. The calculation and simulation results based on the verification model show that CS-SFB MMC has better conduction and switching loss characteristic compared with CS-H FB MMC, SFB MMC and H FB MMC.

Original languageEnglish
Title of host publication2018 1st Workshop on Wide Bandgap Power Devices and Applications in Asia, WiPDA Asia 2018
PublisherInstitute of Electrical and Electronics Engineers
Pages45-54
Number of pages10
ISBN (Electronic)9781538643921
DOIs
Publication statusPublished - May 2018
Externally publishedYes
Event1st Workshop on Wide Bandgap Power Devices and Applications in Asia, WiPDA Asia 2018 - Xi'an, China
Duration: 16 May 201818 May 2018

Conference

Conference1st Workshop on Wide Bandgap Power Devices and Applications in Asia, WiPDA Asia 2018
CountryChina
CityXi'an
Period16/05/1818/05/18

Keywords

  • capacitor-switching semi-full-bridge sub-module
  • modular multilevel converter
  • power loss

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