A modular multilevel converter with isolated energy-balancing modules for MV drives incorporating symmetrical six-phase machines

Mohamed Said Ibrahim Mahmoud Diab, Barry Williams, Derrick Holliday, Ahmed Massoud, Shehab Ahmed

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

8 Citations (Scopus)
51 Downloads (Pure)

Abstract

A modular multilevel converter (MMC) configuration is presented as a medium-voltage high-power drive for variablespeed applications incorporating symmetrical six-phase machines. The topology employs six standard MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of ripple-power decoupling between adjacent sub-modules (SMs) of MMC phaselegs, while feeding machine windings in a spatial phase-opposition fashion, is realized through isolated dc-dc converter modules. This concept offers a significant reduction in SM capacitance, while eliminating the problem of SM capacitor wide voltage fluctuations, especially at low operating frequencies. Furthermore, the proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed up to the rated speed is possible under rated torque operating conditions. The proposed MMC configuration is analyzed in detail, and its performance is validated using both simulation and experimentation.
Original languageEnglish
Title of host publication2017 IEEE Energy Conversion Congress and Exposition (ECCE)
Place of PublicationPiscataway, N.J.
PublisherIEEE
Number of pages8
ISBN (Print)978-1-5090-2999-0
DOIs
Publication statusPublished - 7 Nov 2017
EventIEEE Energy Conversion Congress & Exposition - Cincinnati, United States
Duration: 1 Oct 20175 Oct 2017
http://www.ieee-ecce.org/2017/

Conference

ConferenceIEEE Energy Conversion Congress & Exposition
Abbreviated titleECCE 2017
CountryUnited States
CityCincinnati
Period1/10/175/10/17
Internet address

Keywords

  • dual half bridge
  • medium voltage variable speed drives
  • modular multilevel converter
  • power decoupling

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