PWM Strategy for improved natural balancing of a four-level H-bridge Flying Capacitor Converter

Anar Ibrayeva, Viktor Ten, Yakov L. Familianty, Alex Rudermanz

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

1 Citation (Scopus)

Abstract

Flying capacitor based multilevel PWM converter may be an attractive choice due to the natural balancing property of the capacitor voltages. Previous research on natural balancing of a 4-level H-bridge Flying Capacitor Converter (FCC) with Phase Shifted (PS) PWM showed slow natural balancing rate for small modulation indices. Theoretical natural balancing time constant becomes infinitely large for zero output voltage (modulation index). This was probably the reason that many researchers became interested in active balancing methods for this and other capacitive multilevel voltage source inverters. The paper addresses natural voltage balancing improvement possibilities by employing modified PWM strategies different from classical PS PWM. Dramatic improvement in natural voltage balancing rate for small output voltages is achieved due to making a better use of switching states redundancy. Suggested is a family of improved PWM strategies and the best strategy is identified based on natural balancing damping rate considerations. Natural balancing mechanisms are analyzed using time domain averaging methodology that results in simple easy to interpret expressions regarding parameter influence.

Original languageEnglish
Title of host publicationJoint International Conference - ACEMP 2015
Subtitle of host publicationAegean Conference on Electrical Machines and Power Electronics, OPTIM 2015: Optimization of Electrical and Electronic Equipment and ELECTROMOTION 2015: International Symposium on Advanced Electromechanical Motion Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages311-316
Number of pages6
ISBN (Electronic)9781467372398
DOIs
Publication statusPublished - Mar 7 2016
Event1st Joint International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2015, International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2015 and International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2015 - Side, Turkey
Duration: Sep 2 2015Sep 4 2015

Conference

Conference1st Joint International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2015, International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2015 and International Symposium on Advanced Electromechanical Motion Systems, ELECTROMOTION 2015
CountryTurkey
CitySide
Period9/2/159/4/15

Keywords

  • DC / AC converter
  • modulation strategy
  • multilevel converter
  • single phase system

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Control and Optimization
  • Mechanical Engineering

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