Modulation techniques comparison for three levels VSI converters

Nowadays, multilevel converters are the best option to work with high level power signals in medium voltage ranges. The aim of this article is to compare different continuous functions used to generate driving PWM signals in inverters: cosinusoidal, vectorial and cosinusoidal with zero-sequence functions. In this way, different MATLAB models have been developed to analyze and obtain important conclusions about supply voltage exploitation and load signal harmonic components for each proposed modulation technique. On the other hand, in this document the problem according to the unbalance of the NP voltage in NPC converters is also analyzed. In this way, NP voltage and current are shown and analyzed for each of the modulation methods presented.