Sistemas de conversão estáticos multiníveis hexafásicos e trifásicos.

Abstract

This paper presents seven multi-level conversion system configurations, classified into two groups. The first consists of three six-phase conversion systems with three DC-links and two level legs, while the second consists of four three-phase systems, that result from the combination of NPC legs with two level legs. In each group there is a configuration in which the power flow is bi-directional, called base configuration. From these base topologies, controlled switches are replaced by diodes in order to obtain simpler converters with lower cost and smaller physical size. Furthermore, the use of diodes replacing active switches results in unidirectional power flow, and the system will only have a rectifying function. The complete control system is described, including PWM strategies. Within each group, topologies proposals are compared. Simulations and experimental results will be presented in order to validate the theoretical approaches.