On improving phase-shifted PWM for flying capacitor multilevel converters
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This letter proposes a phase-shifted pulse-width modulation (PS-PWM) technique for the flying capacitor (FC) multilevel converter that improves the quality of the line-to-line voltages. In traditional PS-PWM, the line-to-line voltages include intervals that switch between nonadjacent voltage levels, which deteriorates the harmonic performance. The proposed PS-PWM constantly achieves line-to-line voltages with switching transitions between two adjacent levels. The proposed modulation technique is implemented using two sets of n evenly phase-shifted carriers that are alternatively applied depending on the instantaneous value of the reference signal of each phase-leg. Furthermore, it can be implemented in FC multilevel converters with any number of levels while maintaining natural capacitor voltage balance. Experimental results from a four-level FC converter prototype are presented.
CitationGhias, A., Pou, J., Capella, G., Acuna, P., Agelidis, V. On improving phase-shifted PWM for flying capacitor multilevel converters. "IEEE transactions on power electronics", 01 Agost 2016, vol. 31, núm. 8, p. 5384-5388.