A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines

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

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

Abstract

This paper proposes a new modular multilevel converter (MMC) configuration as a medium-voltage drive for variable-speed applications incorporating symmetrical six-phase machines. The proposed topology employs six MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of sharing one capacitor between each pair of adjacent-arm submodules (SMs) of MMC phase-legs, while feeding machine windings in a spatial phase-opposition, is realized through a new integrated SM arrangement. The integrated SM allows the shared capacitor to absorb and release the same energy amount in a consecutive switching scheme, where the capacitor is experiencing both charging and discharging arm currents, one after another. This results in a limited voltage variation across the SM shared capacitor, independent of the operating frequency. Also, the proposed approach allows the MMC to utilize half the number of the SM capacitors, compared to a traditional MMC topology, while further diminishes the SM capacitance requirement, reducing the volume of the MMC system and its stored energy. The proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed to the rated speed is possible under rated torque operating condition. The proposed MMC topology is elucidated in detail, and its effective performance is verified using simulation.

Original languageEnglish
Title of host publication2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781538655412
DOIs
Publication statusPublished - 10 Sep 2018
Event19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 - Padova, Italy
Duration: 25 Jun 201828 Jun 2018

Other

Other19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
CountryItaly
CityPadova
Period25/6/1828/6/18

Fingerprint

Capacitor
Converter
Capacitors
Module
Machine windings
Topology
Electric potential
Voltage
Configuration
Capacitance
Torque
Zero
Energy
Consecutive
Arrangement
Sharing
Adjacent
Requirements
Range of data
Simulation

Keywords

  • Medium-voltage drives
  • modular multilevel converter (MMC)
  • shared capacitor
  • six-phase machines
  • submodule (SM) capacitor voltage ripple

ASJC Scopus subject areas

  • Modelling and Simulation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Control and Optimization

Cite this

DIab, M. S., Williams, B. W., Massoud, A. M., & Ahmed, S. (2018). A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines. In 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018 [8459951] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/COMPEL.2018.8459951

A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines. / DIab, Mohamed S.; Williams, Barry W.; Massoud, Ahmed M.; Ahmed, Shehab.

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018. Institute of Electrical and Electronics Engineers Inc., 2018. 8459951.

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

DIab, MS, Williams, BW, Massoud, AM & Ahmed, S 2018, A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines. in 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018., 8459951, Institute of Electrical and Electronics Engineers Inc., 19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018, Padova, Italy, 25/6/18. https://doi.org/10.1109/COMPEL.2018.8459951
DIab MS, Williams BW, Massoud AM, Ahmed S. A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines. In 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018. Institute of Electrical and Electronics Engineers Inc. 2018. 8459951 https://doi.org/10.1109/COMPEL.2018.8459951
DIab, Mohamed S. ; Williams, Barry W. ; Massoud, Ahmed M. ; Ahmed, Shehab. / A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines. 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018. Institute of Electrical and Electronics Engineers Inc., 2018.
@inproceedings{b437d166180c421aa6b06801cca295b7,
title = "A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines",
abstract = "This paper proposes a new modular multilevel converter (MMC) configuration as a medium-voltage drive for variable-speed applications incorporating symmetrical six-phase machines. The proposed topology employs six MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of sharing one capacitor between each pair of adjacent-arm submodules (SMs) of MMC phase-legs, while feeding machine windings in a spatial phase-opposition, is realized through a new integrated SM arrangement. The integrated SM allows the shared capacitor to absorb and release the same energy amount in a consecutive switching scheme, where the capacitor is experiencing both charging and discharging arm currents, one after another. This results in a limited voltage variation across the SM shared capacitor, independent of the operating frequency. Also, the proposed approach allows the MMC to utilize half the number of the SM capacitors, compared to a traditional MMC topology, while further diminishes the SM capacitance requirement, reducing the volume of the MMC system and its stored energy. The proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed to the rated speed is possible under rated torque operating condition. The proposed MMC topology is elucidated in detail, and its effective performance is verified using simulation.",
keywords = "Medium-voltage drives, modular multilevel converter (MMC), shared capacitor, six-phase machines, submodule (SM) capacitor voltage ripple",
author = "DIab, {Mohamed S.} and Williams, {Barry W.} and Massoud, {Ahmed M.} and Shehab Ahmed",
year = "2018",
month = "9",
day = "10",
doi = "10.1109/COMPEL.2018.8459951",
language = "English",
isbn = "9781538655412",
booktitle = "2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - GEN

T1 - A Modular Multilevel Converter with Integrated Shared Capacitor Sub-Module for MV Motor Drives Incorporating Symmetrical Six-Phase Machines

AU - DIab, Mohamed S.

AU - Williams, Barry W.

AU - Massoud, Ahmed M.

AU - Ahmed, Shehab

PY - 2018/9/10

Y1 - 2018/9/10

N2 - This paper proposes a new modular multilevel converter (MMC) configuration as a medium-voltage drive for variable-speed applications incorporating symmetrical six-phase machines. The proposed topology employs six MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of sharing one capacitor between each pair of adjacent-arm submodules (SMs) of MMC phase-legs, while feeding machine windings in a spatial phase-opposition, is realized through a new integrated SM arrangement. The integrated SM allows the shared capacitor to absorb and release the same energy amount in a consecutive switching scheme, where the capacitor is experiencing both charging and discharging arm currents, one after another. This results in a limited voltage variation across the SM shared capacitor, independent of the operating frequency. Also, the proposed approach allows the MMC to utilize half the number of the SM capacitors, compared to a traditional MMC topology, while further diminishes the SM capacitance requirement, reducing the volume of the MMC system and its stored energy. The proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed to the rated speed is possible under rated torque operating condition. The proposed MMC topology is elucidated in detail, and its effective performance is verified using simulation.

AB - This paper proposes a new modular multilevel converter (MMC) configuration as a medium-voltage drive for variable-speed applications incorporating symmetrical six-phase machines. The proposed topology employs six MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of sharing one capacitor between each pair of adjacent-arm submodules (SMs) of MMC phase-legs, while feeding machine windings in a spatial phase-opposition, is realized through a new integrated SM arrangement. The integrated SM allows the shared capacitor to absorb and release the same energy amount in a consecutive switching scheme, where the capacitor is experiencing both charging and discharging arm currents, one after another. This results in a limited voltage variation across the SM shared capacitor, independent of the operating frequency. Also, the proposed approach allows the MMC to utilize half the number of the SM capacitors, compared to a traditional MMC topology, while further diminishes the SM capacitance requirement, reducing the volume of the MMC system and its stored energy. The proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed to the rated speed is possible under rated torque operating condition. The proposed MMC topology is elucidated in detail, and its effective performance is verified using simulation.

KW - Medium-voltage drives

KW - modular multilevel converter (MMC)

KW - shared capacitor

KW - six-phase machines

KW - submodule (SM) capacitor voltage ripple

UR - http://www.scopus.com/inward/record.url?scp=85054498563&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054498563&partnerID=8YFLogxK

U2 - 10.1109/COMPEL.2018.8459951

DO - 10.1109/COMPEL.2018.8459951

M3 - Conference contribution

SN - 9781538655412

BT - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018

PB - Institute of Electrical and Electronics Engineers Inc.

ER -