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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 non-adjacent 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.
CitationPerez, R., Puig, V., Pascual, J., Quevedo, J., Landeros, E., Peralta, A. Methodology for leakage isolation using pressure sensitivity analysis in water distribution networks. "Control engineering practice", Juliol 2011, vol. 19, núm. 10, p. 1157-1167.
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