Multicell Schemes for Active-Switched-Capacitor and Active-Switched-Capacitor/Switched- Inductor Quasi-Z-Source Inverters

This paper proposes two new multicell schemes for active-switched-capacitor quasi-Z-source inverter (ASC-qZSI) and ASC/switched-inductor-qZSI topologies. Detailed theoretical models for the proposed schemes are developed. Moreover, extensive performance comparison with several existing active and passive qZSI topologies is presented. Appropriate simulations and experimental studies have been carried out, which verify the theoretical proposals. It is concluded that the proposed topologies can be useful in practical applications requiring large dc-ac voltage gain, for example, in renewable systems with low-voltage sources such as photovoltaics or fuel cells.