Overmodulation of n-level three-leg DC-AC diode-clamped converters with comprehensive capacitor voltage balance

S. Busquets-Monge, Ram Krishan Maheshwari, Stig Munk-Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

34 Citations (Scopus)

Abstract

This paper presents a novel PWM strategy for nlevel 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 PWM algorithm 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 threephase neutral-point clamped converter.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Volume60
Issue number5
Pages (from-to)1872-1883
Number of pages12
ISSN0278-0046
DOIs
Publication statusPublished - 2013

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