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Optimal Pulse-Width Modulation for Three-Level Inverters.

Authors :
Brückner, Thomas
Holmes, Donald Grahame
Source :
IEEE Transactions on Power Electronics; Jan2005, Vol. 20 Issue 1, p82-89, 8p
Publication Year :
2005

Abstract

The three-level neutral-point-clamped voltage source inverter is widely used in high power, medium voltage applications. This paper studies continuous and discontinuous pulse-width modulation for this inverter. Detailed analysis of discontinuous modulation shows that the average switching frequency is not directly proportional to the carrier or sampling frequency, since additional switching transitions occur between different regions of discontinuity. At typical switching frequencies for high power applications (up to 2 kHz) these additional transitions contribute significantly to the inverter's total losses, so that a proper comparison of the harmonic performance can only be carried out under constant loss conditions with varying carrier frequency. This comparison is performed for a typical industrial medium voltage inverter. The paper then considers the major issues of neutral-point voltage balancing and loss distribution within the inverter, for the identified optimal modulation schemes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08858993
Volume :
20
Issue :
1
Database :
Complementary Index
Journal :
IEEE Transactions on Power Electronics
Publication Type :
Academic Journal
Accession number :
15851036
Full Text :
https://doi.org/10.1109/TPEL.2004.839831