Intrinsic and Robust Voltage Balancing of FCML Converters with Coupled Inductors

Daniel H. Zhou, Avi Bendory, Ping Wang, Minjie Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Flying capacitor voltage balancing is critical for the performance of flying capacitor multilevel (FCML) converters. This paper investigates the fundamentals of intrinsic capacitor voltage balancing of multiphase FCML converters with coupled inductors. It is shown that the coupled inductor provides a new, intrinsic mechanism of flying capacitor voltage balancing that is robust to periodic disturbances and independent of the inductor quality factor. This balancing mechanism is typically stronger than natural balancing. The imbalances with uncoupled inductors are analytically predicted and shown to be dependent on the quality factor of the inductor, thus leading to much larger imbalances compared to the coupled inductor balancing mechanism. A dynamic model for voltage balancing of the flying capacitors with coupled inductors is derived and used to estimate the time required to settle from an initial imbalance. The theoretical analysis is verified with simulations and experimental results. Adding coupled inductors to FCML converters can greatly enhance the robustness of FCML converters against physical nonidealities and periodic disturbances.

Original languageEnglish (US)
Title of host publication2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics, COMPEL 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665436359
DOIs
StatePublished - 2021
Event22nd IEEE Workshop on Control and Modelling of Power Electronics, COMPEL 2021 - Cartagena, Colombia
Duration: Nov 2 2021Nov 5 2021

Publication series

Name2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics, COMPEL 2021

Conference

Conference22nd IEEE Workshop on Control and Modelling of Power Electronics, COMPEL 2021
Country/TerritoryColombia
CityCartagena
Period11/2/2111/5/21

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology

Keywords

  • Coupled inductors
  • Dynamic analysis
  • Flying capacitor multilevel converter
  • Natural balancing
  • Voltage balancing

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