A carrier-based approach for overmodulation of three-level neutral-point-clamped inverter with zero neutral-point current

Ramkrishan Maheshwari*, Stig Munk-Nielsen, Sergio Busquets-Monge

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

In a voltage source inverter, overmodulation is required to extend the range of operation and enhance the dc-link voltage utilization. A carrier-based implementation of a modulation strategy for the three-level neutral-point- clamped inverter is proposed for the overmodulation region. The modulation strategy ensures zero average neutral-point current in a switching period. A newly proposed boundary compression is used to regulate the dc-link voltage at all operating points. A description of the algorithm to implement the modulation strategy is also presented. The main advantage of the proposed algorithm is its simplicity. The reference signals for the PWM can be calculated using maximum six steps and does not require knowledge of the reference vector angle. The modulation strategy has been implemented in a three-level neutral-point-clamped inverter, and experimental results are presented.

Original languageEnglish
Title of host publication2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
Number of pages7
Publication date17. Dec 2012
Pages1767-1773
Article number6342598
ISBN (Print)9781467308014
DOIs
Publication statusPublished - 17. Dec 2012
Event4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012 - Raleigh, NC, United States
Duration: 15. Sep 201220. Sep 2012

Conference

Conference4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
Country/TerritoryUnited States
CityRaleigh, NC
Period15/09/201220/09/2012
SponsorIEEE Power Electronics Society, IEEE Industry Applications Society

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