Three-phase cascade multilevel inverter using commutation sub-cells

In this paper the study of a modular three-phase multilevel inverter for application in electrical machines is proposed. Unlike the cascaded H-bridge inverter, this topology uses commutation cells connected in cascade using two inverter legs in series. A detailed analysis of the structure and the development of an equation in the load voltage for n levels is carried out using PWM phase-shifted multicarrier modulation. The simulations and experimental results for a 15 kW three-phase system, with nine voltage levels, validate the study presented.