Análise Comparativa Entre Modulação Multinível Clássica e Multi-taxas em Aplicações de Acionamentos de Motores de Indução
Keywords: Multicell converters, multilevel modulation, multirate modulation, high voltage electrical drives, losses in converters
AbstractSemiconductor based electrical drives are used in a variety of applications due to the possibilities and advantages of their usage in machine velocity and torque control. In this context, this work presents computational studies of multicell power converters applications for high voltage induction machine drives using classical and multirate modulation techniques. Due to novelty of the chosen multirate techniques, there is a demand for more studies using it, especially in electrical drives applications since the majority of the conducted studies are for energy conditioning systems and d.c.-d.c. converters. Therefore, this paper proposes a comparative analysis between classical and multirate modulations for electrical drives applications. The computational studies are conducted with the PLECS software due to its capabilities to calculate the converter’s losses considering the electrical and thermal models of the semiconductor switches. The comparative analysis is conducted for converters with several different number of cells and switching frequencies, with the evaluation of both the output voltage and current waveform quality, as well as the converter’s total losses.