This paper presents a fair comparison of power losses in two-level and NPC three-level PWM converters using different switching devices. Conduction losses for IGBT and diode are calculated as a function of modulation index and power factor. Switching losses are calculated as a function of the switching frequency. Three level converters give a lower total power loss compared with two-level converters. Cost comparison has shown the two level configuration is about 25% cheaper than the three level configuration.
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Alemi et al. (2011) studied this question.
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