A dual modular multilevel converter with high-frequency magnetic links between sub-modules for MV open-end stator winding machine drives

Mohamed S. Diab, Ahmed M. Massoud, Shehab Ahmed, Barry W. Williams

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper presents a dual Modular Multilevel Converter (MMC) topology that utilizes energy exchange between adjacent arm Sub-Modules (SM), operating with out-of-phase modulation. The proposed configuration is applicable to medium-voltage, high-power variable-speed drives incorporating open-end stator winding machines. A novel concept of power redistribution between adjacent SMs in the dual MMC topology is realized through high-frequency transformer-based dc-dc converter modules. This concept offers a significant reduction in the sizing requirement of the SM capacitance and the stored energy in the MMC system, while avoiding the problem of wide voltage fluctuations of SM capacitors, especially at low operating frequencies. The proposed configuration can produce dc voltage, therefore, a machine speed-range from zero speed to the rated speed is possible under the rated torque operating condition. The operating principles of the proposed dual MMC configuration are elaborated and necessary mathematical analysis is derived. Simulation and experimental results verify the concept of the proposed drive configuration.
LanguageEnglish
Number of pages30
JournalIEEE Transactions on Power Electronics
Early online date2 Aug 2017
DOIs
Publication statusE-pub ahead of print - 2 Aug 2017

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Winding machines
Stators
Electric potential
Topology
High frequency transformers
Variable speed drives
Phase modulation
Capacitors
Capacitance
Torque

Keywords

  • dual half-bridge (DHB)
  • high-frequency transformer
  • low motor speed
  • medium-voltage (MV)
  • modular multilevel converter (MMC)
  • open-end stator winding machines

Cite this

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title = "A dual modular multilevel converter with high-frequency magnetic links between sub-modules for MV open-end stator winding machine drives",
abstract = "This paper presents a dual Modular Multilevel Converter (MMC) topology that utilizes energy exchange between adjacent arm Sub-Modules (SM), operating with out-of-phase modulation. The proposed configuration is applicable to medium-voltage, high-power variable-speed drives incorporating open-end stator winding machines. A novel concept of power redistribution between adjacent SMs in the dual MMC topology is realized through high-frequency transformer-based dc-dc converter modules. This concept offers a significant reduction in the sizing requirement of the SM capacitance and the stored energy in the MMC system, while avoiding the problem of wide voltage fluctuations of SM capacitors, especially at low operating frequencies. The proposed configuration can produce dc voltage, therefore, a machine speed-range from zero speed to the rated speed is possible under the rated torque operating condition. The operating principles of the proposed dual MMC configuration are elaborated and necessary mathematical analysis is derived. Simulation and experimental results verify the concept of the proposed drive configuration.",
keywords = "dual half-bridge (DHB), high-frequency transformer, low motor speed, medium-voltage (MV), modular multilevel converter (MMC), open-end stator winding machines",
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N2 - This paper presents a dual Modular Multilevel Converter (MMC) topology that utilizes energy exchange between adjacent arm Sub-Modules (SM), operating with out-of-phase modulation. The proposed configuration is applicable to medium-voltage, high-power variable-speed drives incorporating open-end stator winding machines. A novel concept of power redistribution between adjacent SMs in the dual MMC topology is realized through high-frequency transformer-based dc-dc converter modules. This concept offers a significant reduction in the sizing requirement of the SM capacitance and the stored energy in the MMC system, while avoiding the problem of wide voltage fluctuations of SM capacitors, especially at low operating frequencies. The proposed configuration can produce dc voltage, therefore, a machine speed-range from zero speed to the rated speed is possible under the rated torque operating condition. The operating principles of the proposed dual MMC configuration are elaborated and necessary mathematical analysis is derived. Simulation and experimental results verify the concept of the proposed drive configuration.

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KW - dual half-bridge (DHB)

KW - high-frequency transformer

KW - low motor speed

KW - medium-voltage (MV)

KW - modular multilevel converter (MMC)

KW - open-end stator winding machines

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