Voltage balancing method for the multilevel flying capacitor converter using phase-shifted PWM

Amer M. Y. M. Ghias, Josep Pou, Mihai Ciobotaru, Vassilios G. Agelidis

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

6 Citations (Scopus)

Abstract

In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads.
Original languageEnglish
Title of host publicationPECon 2012
Subtitle of host publication2012 IEEE International Conference on Power and Energy
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages274-279
Number of pages6
ISBN (Electronic)9781467350198
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 IEEE International Conference on Power and Energy, PECon - 2012 - Kota Kinabalu, Malaysia
Duration: 2 Dec 20125 Dec 2012

Other

Other2012 IEEE International Conference on Power and Energy, PECon - 2012
CountryMalaysia
CityKota Kinabalu
Period2/12/125/12/12

Keywords

  • Capacitor voltage balancing
  • Flying capacitor (FC) converter
  • Multilevel converter
  • Phase-shifted pulse width modulation (PS-PWM)

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