The Quasi-Z Source Cascaded Multilevel Inverter Presents Attractive Advantages In Application To Photovoltaic Power System. Each PV Panel Connects To An H-bridge QZS Inverter To Form A Power Generation Module. The Distributed Maximum Power Point Tracking And All Modules’ Dc-link Peak Voltage Balance Can Be Achieved. However, It Is The Same With The Conventional CMI That The Second-harmonic Voltage And Current Ripples Exist In Each QZSI Module. It Is Crucial For A QZS-CMI To Design The Reasonable QZS Network Parameters To Limit The Ripples Within A Desired Range. This Project Proposes An Analytic Model To Accurately Calculate The 2ω Voltage And Current Ripples Of Each QZSI Module. A QZS Impedance Design Method Based On The Built Model Is Proposed To Limit The 2ω Ripples Of Dc-link Voltage And Inductor Current. Simulated And Experimental Results Through Using The Designed 1.5-kW Prototype Validate The Proposed Analytic Model And The Design Method. Furthermore, This Paper Analyzes All Of The Operating States For A QZSI Module And Calculates The Power Loss. The Measured Efficiency From The Prototype Verifies The Theoretical Calculation, And The QZS-CMI-based Grid-tie PV Power System Is Tested In Practical.

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