PWM algorithm with adaptive offset for three-level multi-phase neutral-point-clamped converters
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This paper proposes a PWM based modulation strategy particularly useful for three-level multi-phase Neutral-Point-Clamped Converters. It achieves similar results to those obtained with the space vector modulation but allowing a very fast and simple implementation in a digital controller. The proposed algorithm is able to maintain the neutral-point voltage under control by the addition of a zero-sequence voltage component to the modulation signals. A simple and efficient methodology to calculate the most appropriate zero-sequence component is described. In addition the modulation strategy is completely general, regardless the number of phases of the converter, and therefore it is easy extendible to n-phase converters.
CitacióLópez, I. [et al.]. PWM algorithm with adaptive offset for three-level multi-phase neutral-point-clamped converters. A: Annual Conference of the IEEE Industrial Electronics Society. "IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society". Vienna: 2013, p. 1185-1190.