CCM and DCM operation analysis of cascaded quasi-Z-source inverter

This paper presents the steady-state analysis of the voltage-fed quasi-Z-source inverter (qZSI) with cascaded (two-stage) quasi-Z-source network (qZS-network). Cascaded qZS-network is derived by the adding of one diode, one inductor and two capacitors to the traditional qZSI. Main focus of this paper is on mathematical models of the cascaded qZS-converter. Static models were elaborated and analyzed for the continuous (CCM) and discontinuous conduction mode (DCM) of the converter. In order to verify the theoretical assumptions a prototype has been built. The experimental results are presented and analyzed.