A modular multilevel converter with DHB energy balancing channels for medium-voltage adjustable-speed drives

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

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Abstract

This paper presents a modular multilevel converter (MMC) configuration that utilises energy exchange between submodules (SMs) of upper and lower arms, for energy rebalancing. The configuration is applicable to mediumvoltage high-power variable-speed drives with any number of motor phases, where the traditional MMC topology experiences challenging shortcomings. With the out-of-phase alternation of the fundamental ripple power in upper and lower arms, the proposed MMC configuration decouples this ripple power by employing dual half-bridge modules linking opposite SMs in upper and lower arms of the same MMC-leg. This counter-balances arm ripple-power through bidirectional power transfer between opposite SMs, resulting in a reduction in the SM capacitance and the MMC system stored energy. The proposed MMC configuration solves the problem of wide SM capacitor voltage fluctuation, especially at low operating frequencies, where the SM capacitor voltage ripple profile is almost constant, independent of the operating frequency. Therefore, the configuration is able to drive multi-megawatt machines from stand-still to the rated speed, at rated torque. The operation of the proposed converter topology is elucidated in detail, and its effectiveness is verified through simulation and experimentation.
Original languageEnglish
Number of pages6
Publication statusPublished - 17 Apr 2018
EventThe 9th International Conference on Power Electronics, Machines and Drives - Liverpool, United Kingdom
Duration: 17 Apr 201819 Apr 2018
Conference number: 9th
https://events.theiet.org/pemd/

Conference

ConferenceThe 9th International Conference on Power Electronics, Machines and Drives
Abbreviated titlePEMD 2018
CountryUnited Kingdom
CityLiverpool
Period17/04/1819/04/18
Internet address

Keywords

  • dual half bridge
  • medium voltage variable speed drives
  • power decoupling submodule

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    Diab, M. S., Holliday, D., Massoud, A. M., Ahmed, S., & Williams, B. W. (2018). A modular multilevel converter with DHB energy balancing channels for medium-voltage adjustable-speed drives. Paper presented at The 9th International Conference on Power Electronics, Machines and Drives, Liverpool, United Kingdom.