A High Step-Up Hybrid Y-Source-Quasi-Z Source DC-DC Converter for Renewable Energy Applications

In this article, a high step-up hybrid Y-source-quasi-Z source dc-dc converter is obtained by combining the topology of Y-source and quasi-Z source. The proposed converter inherits all the advantages of Y-source and quasi-Z source converter, namely continuous input current, common ground between input and output voltages, built-in step-down transformer, low voltage stress of switch, and low output diode current stress. In addition, the proposed converter has high voltage gain and conversion efficiency. The steady-state analysis and voltage and current stress derivation are presented. A numerical design of the components is conducted. The loss distribution is precisely calculated. The conversion efficiency at different voltage gains was also investigated. A small signal model is composed. Then the stability of the system is studied and optimized by PID compensator. Finally, a 160-W prototype made in the laboratory verified the effectiveness of the proposed converter, and the efficiency reached 95.201% when operating at rated output power. The proposed converter has the highest experimental efficiency with respect to the other compared converters.