An experimental study of modified space vector modulation applied to quasi Z source inverters using FPGA

Z-source/quasi Z-source inverters (qZSI) can eliminate DC-DC converter in conventional drive applications where DC-DC converter is coupled with voltage source inverter (VSI). Compared to Z-source inverter (ZSI), qZSI has more advantages like continuous input current and lower component ratings. In these inverters, DC link voltage is boosted by using shoot through state i.e., turning ON both the switches in the inverter leg. In this paper, conventional space vector modulation is modified for introducing shoot through state that is necessary for boosting DC link voltage, without any extra switching operations. This paper gives detailed implementation steps for this modified space vector modulation and is implemented by FPGA.