A comparative analysis of the three-level NPC and ANPC converter loss distribution

Abstract

In this paper, a comparative analysis of the three-level NPC and ANPC converter loss distribution are presented. Switching states and commutation principle of two topologies are analyzed and compared; Also, the loss distribution mathematical model of the two topologies has been established. The main feature of the three-level ANPC structure is to use the switching devices to replace the clamp diodes of the three-level NPC topology, by selecting the different zero voltage state. As a result, it can realize the loss distribution balance among the power devices. Then, the simulation results are shown the effectiveness of the three-level ANPC topology as it can realize the power devices loss equalize under different work conditions, and verified the validity of the proposed loss distribution mathematical model.