Analysis of Soft-Switched High Frequency AC-AC Converter for Induction Motor Drive

摘要

The systematic mathematical analysis of the high frequency soft-switched AC-AC converter is pro- posed for variable frequency induction machine load in this paper. Both PWM and square-wave modes of operation have been considered. The frequency relation and phase unbalance problem due to discrete time integral half-cycle switching has been discussed in the beginning. Then, generalized Fourier series have been derived for output voltage, output current and supply current in two modes. The analytical results help to understand the converter characteristics, design optimally a converter- machine system of arbitrary capacity considering the various trade-off parameters.