Comparative evaluation of modulation algorithms for neutral-point-clamped converters

Neutral-point-clamped converters are increasingly applied in industrial drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage total harmonic distortion (THD), and can develop low common mode voltage. Several distinct modulation st...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2005-03, Vol.41 (2), p.634-643
Main Authors: Bendre, A., Krstic, S., Vander Meer, J., Venkataramanan, G.
Format: Article
Language:English
Subjects:
Analytical models
Converter control
Converters
Diodes
Drives
Electric potential
Electromagnetic interference
harmonics
Industry Applications Society
Low voltage
Mathematical models
modeling
Modulation
multilevel converters
Power harmonic filters
Ripples
State vectors
Strategy
Switching converters
Switching frequency
Total harmonic distortion
Voltage
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Summary:Neutral-point-clamped converters are increasingly applied in industrial drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage total harmonic distortion (THD), and can develop low common mode voltage. Several distinct modulation strategies have been proposed in the past for eliminating the common mode voltage, providing low THD output voltage or reducing the neutral point current ripple. However, each of these strategies improves the performance of the converter on one metric while trading off performance in other metrics. Nearest three vector, radial state, and zero-common-mode types of space-vector modulation techniques are compared using metrics that clearly elucidate the performance tradeoffs. Analytical models, computer simulation results, and experimental verification are presented.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2005.844374