Análise comparativa de sistemas de acionamento para máquina de indução hexafásica com a rede configurada em Open-End.

Abstract

In this work, two drive systems based on static converters for six-phase induction machines are presented and discussed. Each one of them has the finality of interconnecting one MIH (six-phase induction machine) to the electrical grid by means of AC/DC/AC converters. In general, these converters work with controlled power switches, i.e., IGBT transistors. In the first system, the electrical grid is set up in open-end. To each side of the grid one AC/DC/AC converter is connected, and the legs linked to the grid are complete, i.e., they are composed only by pairs of switches. Each AC/DC/AC converter is also linked to one of the three-phase sets of the six-phase machine, interconnecting it to the grid. The legs linked to the machine are also complete. The second system is similar to the first, with the difference that the legs connected to the grid are all mixed, i.e., they are composed by a power diode on the upper part and by a switch (IGBT transistor) on the bottom part. The advantages and disadvantages of the proposed configurations will be discussed throughout this work. Therefore, it will be discussed and explained the systems models, the scalar and per level PWM techniques applied on the converters switching, the control strategies and diagrams for each case, and finally it will be done the comparative analysis of the two systems in terms of cost and quality, taking the simulation results as basis.