A Currentless Sorting and Selection based Capacitor-Voltage-Balancing Method for Modular Multilevel Converters

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Abstract

This letter proposes a currentless sorting and selection (SAS)-based capacitor-voltage-balancing method for modular multilevel converters. Without the knowledge of arm-current signals, this method has almost the same performance as the conventional SAS method while reducing the sampling signals, compacting the control system, and saving the overall cost. In this letter, the derivative of the total capacitor voltage of an arm, instead of the arm current, is employed to determine which submodules should be inserted or bypassed. Furthermore, the efficacy of the proposed method is verified by experimental results.
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This letter proposes a currentless sorting and selection (SAS)-based capacitor-voltage-balancing method for modular multilevel converters. Without the knowledge of arm-current signals, this method has almost the same performance as the conventional SAS method while reducing the sampling signals, compacting the control system, and saving the overall cost. In this letter, the derivative of the total capacitor voltage of an arm, instead of the arm current, is employed to determine which submodules should be inserted or bypassed. Furthermore, the efficacy of the proposed method is verified by experimental results.
Original languageEnglish
JournalIEEE Transactions on Power Electronics
Volume34
Issue number2
Pages (from-to)1022 - 1025
Number of pages4
ISSN0885-8993
DOI
Publication statusPublished - Feb 2019
Publication categoryResearch
Peer-reviewedYes

    Research areas

  • capacitor voltage balancing, currentless sorting and selection, experiments, Modular Multilevel Converter

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