Full-bridge modular multilevel converter (FB-MMC) with extended control range

Grain Philip Adam, Stephen Finney, Barry Williams, Innocent Ewean Davidson, Abdelaziz Yousif Mohammed Abbas

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

6 Citations (Scopus)
413 Downloads (Pure)


This paper presents an attractive control scheme that decouples cell capacitor voltage regulation of the FB-MMC from the dc link voltage regulation. This is achieved by manipulating both ac and dc components of modulation functions. The dc component of modulation function is used to regulate the cell capacitor voltages independent of the dc link voltage, while the magnitude and phase of modulation function ac component are manipulated to control active and reactive powers FB-MMC exchanges with the ac grid. The significance of this control scheme is that it permits the FB-MMC to operate with variable dc link voltage, including negative dc link voltage and zero, while full control over the power FB-MMC exchanges with ac grid is retained. Additionally, this paper provides comprehensive discussion of MMC fundamental theory, including logical and mathematical derivations of the basic relationships that governed its operation and modulation. The validity of the presented control scheme is confirmed using simulations.
Original languageEnglish
Title of host publicationAFRICON, 2015
Place of PublicationPiscataway
Number of pages5
ISBN (Print)9781479974986
Publication statusPublished - 14 Sept 2015
EventIEEE AFRICON 2015 - UNECA Conference Center, Addis Ababa, Ethiopia
Duration: 14 Sept 201517 Sept 2015


ConferenceIEEE AFRICON 2015
CityAddis Ababa


  • capacitors
  • HVDC transmission
  • mathematical model
  • modulation
  • power conversion
  • voltage control


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