Conditions for capacitor voltage regulation in a five-level cascade multilevel inverter: Application to voltage-boost in a PM drive

John Chiasson, Burak Özpineci, Zhong Du, Leon M. Tolbert

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

22 Scopus citations

Abstract

A cascade multilevel inverter is a power electronic device built to synthesize a desired AC voltage from several levels of DC voltages. Such inverters have been the subject of research in the last several years, where the DC levels were considered to be identical in that all of them were either batteries, solar cells, etc. Similar to previous results in the literature, the work here shows how a cascade multilevel inverter can be used to obtain a voltage boost at higher speeds for a three-phase PM drive using only a single DC voltage source. The input of a standard three-leg inverter is connected to the DC source and the output of each leg is fed through an H-bridge (which is supplied by a capacitor) to form a cascade multilevel inverter. A fundamental switching scheme is used, which achieves the fundamental in the output voltage while eliminating the fifth harmonic. A new contribution in this paper is the development of explicit conditions in terms of the power factor and modulation index for which the capacitor voltage of the H-bridges can be regulated while simultaneously maintaining the aforementioned output voltage. This is then used for a PM motor drive showing the machine can attain higher speeds due to the higher output voltage of the multilevel inverter compared to using just a three-leg inverter.

Original languageEnglish
Title of host publicationProceedings of 2007 IEEE International Electric Machines and Drives Conference, IEMDC 2007
Pages731-735
Number of pages5
DOIs
StatePublished - 2007
EventIEEE International Electric Machines and Drives Conference, IEMDC 2007 - Antalya, Turkey
Duration: May 3 2007May 5 2007

Publication series

NameProceedings of IEEE International Electric Machines and Drives Conference, IEMDC 2007
Volume1

Conference

ConferenceIEEE International Electric Machines and Drives Conference, IEMDC 2007
Country/TerritoryTurkey
CityAntalya
Period05/3/0705/5/07

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