Simple comparison of different PWM strategies for a three-level H-bridge flying capacitor converter

A. Ruderman, B. Reznikov

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

15 Citations (Scopus)

Abstract

The paper presents a comparison of phase-shifted and modified level-shifted carrier-based PWM strategies for a three-level H-bridge flying capacitor converter. While the optimal voltage quality of the nearest level switching may be obtained using both of them, natural voltage balancing dynamics is different. Using elementary circuit theory and switched system time domain analysis, it is possible to obtain simple analytical averaged voltage balancing dynamics solutions. Modified level-shifted carrier-based PWM is shown to provide much faster voltage balancing dynamics, especially, for small DC PWM voltage commands and AC PWM modulation indices. The explanation of this fact is obtained by analysis of zero voltage state sequences for different modulation strategies. Relatively fast voltage balancing dynamics rate provided by modified level-shifted carrier-based PWM for zero voltage command makes it possible to implement simple flying capacitors self-precharge procedure at power-up.

Original languageEnglish
Title of host publication2010 12th International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2010
Pages544-550
Number of pages7
DOIs
Publication statusPublished - Aug 24 2010
Event2010 12th International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2010 - Brasov, Romania
Duration: May 20 2010May 22 2010

Publication series

NameProceedings of the International Conference on Optimisation of Electrical and Electronic Equipment, OPTIM
ISSN (Print)1842-0133

Conference

Conference2010 12th International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2010
CountryRomania
CityBrasov
Period5/20/105/22/10

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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