Comparison of Modulation Techniques for Cascaded and Reverse Voltage Multilevel Inverter Topologies

Multilevel inverters have been widely used for highpower, high-voltage applications. Among the existing multilevel inverter topologies Cascaded inverter topology has many advantages over Neutral point clamped and Flying capacitor inverters, but it requires isolated DC sources which is a main drawback of this topology. A new topology with a reversingvoltage component requires fewer numbers of components, switches and carrier signals when compared to other existing topologies. In this paper, the voltage control strategy (Fundamental switching and Sinusoidal Pulse Width Modulation (SPWM)) of the conventional cascaded inverter topology is compared with the new reverse voltage topology. Simulation using MATLAB Simulink has been carried out for single phase seven level cascaded inverter and RV inverter for both open and closed loop conditions. Results have been compared and validated for the same.