Full Bridge MMC Converter Optimal Design to HVDC Operational Requirements

Weixing Lin, Dragan Jovcic, Samuel Nguefeu, Hani Saad

Research output: Contribution to journalArticlepeer-review

193 Citations (Scopus)
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Design and operation of FB (full bridge) MMC that meets HVDC specifications are studied in this paper. Three new design parameters: the over-modulation index (kMMC), the DC modulation index (Mdc), the minimal DC voltage (Vminpu) are introduced to specify the operation of a FB MMC. Power increase and semiconductor count increase with the increase of kMMC is analyzed to understand benefits of over-modulation. The required number of submodules and the number of more-costly FB submodules for specified rated dc voltage, Vminpu and kMMC are calculated. The relationship of the submodule inserting logic and dynamics of an arm is analyzed. The submodule voltage balancing is studied and the constraints on the required number of FB submodules are deduced. The capability of over-modulation and the operation under low DC voltage with optimal submodule count are verified using EMTP simulation.
Original languageEnglish
Pages (from-to)1342-1350
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number3
Early online date31 Aug 2015
Publication statusPublished - Jun 2016

Bibliographical note

This project is funded by RTE, Paris, France


  • AC-DC power conversion
  • DC power systems
  • DC power transmission
  • HVDC converters
  • HVDC transmission


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