Aiming at the defects of large capacitor voltage stress and insufficient boosting capacity of traditional Z-source inverter（ZSI）

an improved quasi ZSI（QZSI） topology is proposed. First

the steady-state working principle of the improved Z-source three-level inverter is analyzed in depth

and the expressions of the DC link output voltage and capacitor voltage are obtained

and compared with the traditional Z-source three-level inverter. The theoretical derivation of the passive parameters of the improved Z-source network

combined with an improved simple boost control strategy

illustrates the overall boost capability of the improved Z-source inverter. Finally

the experimental results on the Matlab software and hardware platform verify that the improved Z-source inverter has good boosting capability

reduces capacitor voltage stress

and suppresses start-up shock effects. Compared with the traditional Z-source inverter

the improved Z-source inverter proposed in this paper has the advantages of less stress of capacitor voltage

higher boost of output voltage

and less shock of inductance current.