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Overmodulation of n-Level Three-Leg DC - AC Diode-Clamped Converters With Comprehensive Capacitor Voltage Balance

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3 Author(s)
Busquets-Monge, S. ; Dept. of Electron. Eng., Tech. Univ. of Catalonia, Barcelona, Spain ; Maheshwari, R. ; Munk-Nielsen, S.

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 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 three-phase neutral-point clamped converter.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:60 ,  Issue: 5 )

Date of Publication:

May 2013

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