Abstract: A novel high step-up quasi-Z-source DC-DC boost converter（HSQZSC） is proposed in the article to address the shortcomings of low voltage gain and high component voltage stress in traditional quasi-Z-source impedance network DC-DC boost converters. Firstly, the working principles of the two modes of operation of the HSQZSC converter are analyzed, and their steady-state analysis and parameter design are conducted. Secondly, a performance comparison with the proposed Z-source converter shows that the HSQZSC converter has the advantages of high voltage gain and low component voltage stress. Then, a state-space model is established for small-signal analysis, stability analysis, and controller design. Finally, a 100 W physical prototype is built, and experimental results verify the feasibility and effectiveness of the HSQZSC converter.