Balanced Conduction Loss Distribution among SMs in Modular Multilevel Converters

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Abstract

Due to the parameter mismatch, the unbalanced power loss distribution among SMs in the modular multilevel converter (MMC) can be introduced and further deteriorated by the low-frequency asynchronous switching transients related to no-carrier modulation techniques. The unbalanced thermal stress can reduce the reliability of the MMC and increase the complexity of cooling system design. Nevertheless, an internal balance mechanism exists in the MMC thanks to the capacitor voltage balancing. It contributes to an even conduction loss dissipation among SMs, which is studied and revealed in this paper. Moreover, a computationally light conduction loss estimation method is proposed correspondingly relying on the characteristics of semiconductors and the arm current only. Simulations and experiments are conducted to verify the effectiveness the proposed method.
Original languageEnglish
Title of host publication2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
Number of pages6
PublisherIEEE Press
Publication date22 Oct 2018
Pages3123-3128
Article number8507731
ISBN (Print)978-1-5386-4190-3
ISBN (Electronic)978-4-88686-405-5
DOIs
Publication statusPublished - 22 Oct 2018
Event8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018 - Niigata, Japan
Duration: 20 May 201824 May 2018

Conference

Conference8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
CountryJapan
CityNiigata
Period20/05/201824/05/2018
SponsorIEEE Industry Applications Society (IAS), IEEE Power Electronics Society (PELS), IEEJ Industry Applications Society (IAS)

Keywords

  • balanced conduction loss distribution
  • conduction loss estimation
  • Modular multilevel converter (MMC)
  • semiconductor

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