Overmodulation of n-level three-leg DC-AC diode-clamped converters with comprehensive capacitor voltage balance
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hdl:2117/18443
Document typeArticle
Defense date2013-05
PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial
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Abstract
This paper presents a novel pulsewidth modulation
(PWM) strategy for n-level three-leg semiconductor-clamped
dc–ac converters in the overmodulation region, with dc-link capacitor
voltage balance in every switching cycle. The strategy is
based on the virtual-vector concept. Suitable reference vector trajectories
are selected to obtain low weighted total harmonic distortion
and a simple algorithm. A hexagonal-boundary compression
factor is introduced to guarantee, at any operating point, dc-link
capacitor voltage regulation capabilities in every switching cycle
and avoid narrow gate pulses. The detailed PWMalgorithm for an
easy implementation in a digital control platform is also presented.
The good performance of the strategy is verified through both simulation
and experiments in a three-level three-phase neutral-point
clamped converter.
CitationBusquets-Monge, S.; Maheshwari, R.; Munk-Nielsen, S. Overmodulation of n-level three-leg DC-AC diode-clamped converters with comprehensive capacitor voltage balance. "IEEE transactions on industrial electronics", Maig 2013, vol. 60, núm. 5, p. 1872-1883.
ISSN0278-0046
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