Submodule Level Power Loss Balancing Control for Modular Multilevel Converters

Zhongxu Wang, Huai Wang, Yi Zhang, Frede Blaabjerg

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    13 Scopus citations

    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 languageBritish English
    Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages5731-5736
    Number of pages6
    ISBN (Electronic)9781479973118
    DOIs
    StatePublished - 3 Dec 2018
    Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
    Duration: 23 Sep 201827 Sep 2018

    Publication series

    Name2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

    Conference

    Conference10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
    Country/TerritoryUnited States
    CityPortland
    Period23/09/1827/09/18

    Keywords

    • Modular multilevel converter
    • Power loss balancing
    • Power semiconductors

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