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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Detaljer

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.
OriginalsprogEngelsk
TidsskriftIEEE Transactions on Power Electronics
Volume/Bind34
Udgave nummer2
Sider (fra-til)1022 - 1025
Antal sider4
ISSN0885-8993
DOI
StatusUdgivet - feb. 2019
PublikationsartForskning
Peer reviewJa

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