A full bridge type series connected modular multilevel converters for medium voltage drive

Yifu Liu, Yunpeng Si, Mengzhi Wang, Zhengda Zhang, Chunhui Liu, Qin Lei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposes a new MMC topology, in which, a "full-bridge"with four arms of cascaded full-bridge modules is applied for each phase and three phase legs are series connected in vertical direction to support the DC-link. The major advantages of proposed topology are as follows: (1) The total number of required submodules are reduced to 2/3 compared with traditional MMC topology. As a result, the volume of the converter shrinks significantly. Regarding the reduced voltage amplitude, an AC transformer is used to bring the voltage back into the normal amplitude in a three-phase Y-connection manner. (2) The second order harmonic is eliminated in the proposed unique configuration. Thus, the capacitor size is reduced and no more circulating current control loop is required. A detailed 20 MW simulation has been conducted and the related results of proposed topology have been presented. What's more, The SM prototype and preliminary experiments are also demonstrated and analyzed.

Original languageEnglish (US)
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages267-271
Number of pages5
ISBN (Electronic)9781728189499
DOIs
StatePublished - Jun 14 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: Jun 14 2021Jun 17 2021

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period6/14/216/17/21

Keywords

  • 2order harmonic cancellation
  • High power density
  • MMC

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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