Experimental investigation of a three phase multilevel converter based on two standard voltage source inverters with insulated dc supplies

An experimental investigation of a multilevel converter topology feeding three-phase open-end winding loads is proposed in this paper. The hardware scheme is based on two insulated dc supplies, each one feeding a standard two-level, three-phase inverter. A three-phase, six wires load is connected across the output terminals. A new modulation technique is considered, based on the space vector approach, able to regulate the sharing of the output power between the two dc sources within each switching cycle. The performances of the multilevel converter are discussed on the basis of a complete set of experimental tests.