Sistemas de conversão CA-CA com máquina de indução pentafásica em open-end e conversor estático de dezesseis braços.

Abstract

The development of systems with multi-phase AC machines has been extensively reported in the technical literature. These systems, when compared against the threephase ones, present several advantages, such as tolerance to faults and current reduction across semiconductor switches. In this context, it is known that the use of a high number of phases results in a bigger number of switching states, allows multi-phase machines have greater flexibility in their functionality, resulting in an increased number of switching states, what influences on used modulation strategies and increases the flexibility of multi-phase machine functionalities. As a result, several researches have focused on the development of new multi-phase topologies. This work presents two AC machine drive systems. Each system consists of openwindings five-phase machine and converters AC-DC-AC, which are composed of two threephase inverters and two five-phase rectifiers. In the topology I, it is used an isolating transformer with two secondary taps connected to the two three-phase converters at the grid side. In the topology II, it is used a low power isolation transformer connected in series with the two three-leg converters at the grid side. In both analyzed topologies, the five-phase machine is fed by an open-end ten-leg converter. For each configuration, the PWM modulation and control strategies are presented. Finally, by analyzing the obtained results from digital simulations and experiments in laboratory, the performance of both presented strategies are compared with those obtained using the conventional five-phase configuration and its advantages are highlighted.