Técnicas vetoriais de modulação por largura de pulso para conversores trifásicos de quatro-braços

Abstract

This work study the strategies for three-phase four-leg voltage source converter. Carrier-based pulse width modulator (PWM) method and space vector PWM method are discusses for the three-phase and four-leg voltage source converters. The interest is to establish the comparative analysis between thus and show the advantages of the use this kind of converters. Can be observed two mainly method to solve the implementation of the four-leg converter. The first method uses arrangement of the voltage vectors command in the geometric interpretation in a three-dimensional space. The other method is based on the prior choose of the optimized switching standard. A novel interpretation is proposed based in the two considered method, the intension is to conciliate the advantages of both. Some typical applications for three-phase four-leg voltage inverters are analyzed and the main characteristic and advantages for their use are stuck out. The basic modules to implement the four-leg inverter in the digital signal processor (DSP) are showed. The experimental results are showed after the implementation in the DSP TMS320F2812 and design the three-phase four-leg voltage inverter.