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

Mohamed S. Diab, B. W. Williams, Derrick Holliday, Ahmed M. Massoud, Shehab Ahmed

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

8 Citations (Scopus)

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 2017
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages2715-2722
Number of pages8
ISBN (Electronic)9781509029983
DOIs
Publication statusPublished - 3 Nov 2017
Event9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States
Duration: 1 Oct 20175 Oct 2017

Publication series

Name2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Volume2017-January

Conference

Conference9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
CountryUnited States
CityCincinnati
Period1/10/175/10/17

Keywords

  • Dual half-bridge (DHB)
  • Medium-voltage variable-speed drives
  • Modular multilevel converter (MMC)
  • Power decoupling
  • Sub-module (SM) capacitor voltage-ripple
  • Symmetrical six-phase machines

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