An Improved Alternate Arm Converter for HVDC applications

Dimitrios Vozikis, Grain Adam, Derrick Holliday, Stephen Finney

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

9 Citations (Scopus)
61 Downloads (Pure)


This paper presents an Improved Alternate Arm Converter where the director switches of the upper and lower arms of the conventional alternate arm converter are rearranged as a conventional two-level converter. The flying capacitor (i.e. the capacitor across the director switches) in each phase leg facilitates seamless current commutation between the upper and lower arms, and eliminates the need for the main dc-link capacitor across the positive and negative dc rails. The modifications introduced to the power circuit necessitate the proposed converter to adopt a new operating regime that ensures simultaneous conduction of the upper and lower arms of each phase leg as in the modular multilevel converter. The operating principle, modulation methods of the proposed converter, and sizing of its main components are described in detail, and substantiated by simulations.
Original languageEnglish
Title of host publicationIECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
Place of PublicationPiscataway, NJ
Number of pages5
ISBN (Print)9781509066841, 9781509066834, 9781509066858
Publication statusPublished - 31 Dec 2018
EventIECON 2018 - Washington DC, United States
Duration: 21 Oct 201823 Oct 2018


ConferenceIECON 2018
Country/TerritoryUnited States
CityWashington DC


  • HVDC
  • multilevel converters
  • voltage source converter


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