Cascaded H-Bridge with Single DC Source and Regulated Capacitor Voltage

Multilevel power electronic converter has wide range of applications. In multilevel power electronic converters the output can be synthesized by combining several DC voltage sources. Cascade H-Bridge multilevel inverter generally requires more number of DC sources. An alternative option is to replace all the DC sources feeding H-Bridge cells with capacitors, leaving only one H-Bridge cell with a real DC sources. But balancing the capacitor voltage is challenging. In this paper a new control method for cascade H-bridge multi level inverter fed with only one independent DC source is presented. Simulation results support the proposed control method.