SiC-based three-phase Quasi-Z-Source Inverter versus the two-stage topology - a comparison

摘要

The paper presents an in-depth experimental comparative study between a three-phase Quasi-Z-Source Inverter (qZSI) and a Boost Converter with Voltage-Source Inverter (BC+VSI). Both converters obtain identical output phase voltage value of 230 V RMS from DC input voltage in range of 400 V ÷ 550 V at a similar value of input inductor current ripple. The quality factors investigated are: power losses as well as both input inductor current and output voltage quality (considering both low- and high-frequency harmonics). Moreover, four variants of modulation methods are investigated. At switching frequency of 100 kHz results of experiments using SiC-based 6-kW laboratory models show that at identical conditions the BC+VSI configuration has lower losses and better quality of the output voltage, while qZSI has better quality of the input inductor current.