Submodule Level Power Loss Balancing Control for Modular Multilevel Converters

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Abstract

This paper investigates the power loss imbalance in Modular Multilevel Converters (MMCs) with Nearest Level Modulation (NLM) resulting from the low switching frequency operation and the parameter mismatch. The imbalance might pose a challenge to the cooling system design as well as the reliability of the MMC. To address this problem, a submodule-level power loss balancing control (PLBC) is proposed. Compared with the normal control strategy without the thermal balancing, this method is able to decrease the degree of power loss imbalance among submodules (SMs) to at least half without deteriorating the performance of the converter efficiency and the capacitor voltage ripple. The effectiveness of the proposed control is validated by simulations.
Original languageEnglish
Title of host publicationProceedings of the IEEE Energy Conversion Congress and Exposition (ECCE 2018)
Number of pages6
Place of PublicationUSA
PublisherIEEE Press
Publication dateSep 2018
Pages5731 - 5736
ISBN (Print)978-1-4799-7313-2
ISBN (Electronic)978-1-4799-7312-5
DOIs
Publication statusPublished - Sep 2018
EventIEEE Energy Conversion Congress & Exposition ECCE 2018 - Portland, United States
Duration: 23 Sep 201827 Sep 2018
http://www.ieee-ecce.org/2018/

Conference

ConferenceIEEE Energy Conversion Congress & Exposition ECCE 2018
Country/TerritoryUnited States
CityPortland
Period23/09/201827/09/2018
Internet address
SeriesIEEE Energy Conversion Congress and Exposition
ISSN2329-3721

Keywords

  • Power loss balancing
  • Modular multilevel converter (MMC)
  • Power Semiconductors

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