Current control of the three phase five-level PUC-NPC converter

In this paper, authors propose a novel current control suitable for the three phase five-level PUC-NPC converter. The later was introduced in previous papers, it results from a topological optimization of a series connection of two three level PUC and NPC converters. The PUC-NPC topology is characterized by the use of only six power switches per phase in the case of five level converter. Modeling of the proposed PUC-NPC rectifier and a novel current control associated to a novel balancing technique are performed in order to draw a nearly sinusoidal lines currents and line-to-line voltages with a unity power factor operation. The balanced DC link and auxiliary output voltages insure the protection of loads, passives and actives power devices. The proposed PUC-NPC three phase five level rectifier associated to the proposed control and balancing techniques were verified by simulation.