A Hybrid Nine-Arm Modular Multilevel Converter for Medium-Voltage Six-Phase Machine Drives

Mohamed Said Diab, Ahmed Elserougi, Ahmed M. Massoud, Shehab Ahmed, Barry Williams

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The nine-arm modular multilevel converter (9A-MMC) has been recently proposed as a reduced MMC topology variation for six-phase drive applications, with 25% reduction in the number of employed arms and associated components, compared to a standard dual three-phase MMC, however with a limited output voltage amplitude. This paper proposes a hybrid 9A-MMC comprised of half-bridge submodules (SMs) in both the upper and lower arms, and full-bridge SMs in the middle arms. By employing the negative-voltage state of the full-bridge SMs, the hybrid 9A-MMC avoids the limitations imposed on the dc-link voltage utilization, while achieves further reduction in the component count, compared to a standard 9A-MMC with identical half-bridge SMs. The operating principles of the proposed hybrid 9A-MMC are illustrated with mathematical analysis, while its characteristics are verified through both simulation and experimentation. An assessment of the proposed topology quantifying its employed components is also provided, in comparison to other MMC-based six-phase machine drives.

Original languageEnglish
JournalIEEE Transactions on Industrial Electronics
DOIs
Publication statusAccepted/In press - 1 Jan 2018

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Keywords

  • Capacitors
  • Electrical engineering
  • Hybrid modular multilevel converter (MMC)
  • Inverters
  • Legged locomotion
  • medium-voltage machine drive
  • Modular multilevel converters
  • nine-arm MMC
  • six-phase machines
  • Standards
  • Topology

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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