Voltage balancing method for a flying capacitor multilevel converter using phase disposition PWM

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

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

This paper proposes a voltage balancing method for a flying capacitor multilevel converter based on the phase-disposition sinusoidal pulsewidth modulation (PD-SPWM). This voltage balancing method uses redundant switching states, which are determined by the minimization of a cost function. The implementation of the PD-SPWM using standard triangular carriers leads to additional switching events that are due to the transitions within the same voltage level, thus increasing the switching frequency of the power devices. Such drawback can be avoided by using sawtooth carrier waveforms. Another characteristic of the proposed voltage balancing method is that it does not require the tuning of parameters to achieve optimal performance. Simulation and experimental results confirm the robustness of the proposed method operating with different loads and transient conditions.
Original languageEnglish
Pages (from-to)6538-6546
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Volume61
Issue number12
DOIs
Publication statusPublished - Dec 2014
Externally publishedYes

Keywords

  • Capacitor voltage balancing
  • flying capacitor (FC) converter
  • multilevel converter
  • pulsewidth modulation (PWM)

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