Proposed new N-multilevel family of topologies for T-type inverter

Abstract

This paper proposes a new N-multilevel topologies for T-type inverter. The proposed topologies constitute the single bridge legs with the shape of the rotated character “T” and a variable direct current-link circuit. The proposed topologies present higher efficiency and lower number of components compared with NPC topologies and nested multilevel topologies. Also, other topologies have been compared in terms of reduced number of diodes, switches, flying capacitors, and DC supplies. The optimized staircase modulation technique is used to obtain voltage waveforms with high quality and superior output voltages. Furthermore, the principles of the proposed topologies were validated via simulations and experiments.