A high step-up converter for interfacing renewable energy generation is proposed. The converter is composed of a modified quasi-Z-source network, a three-winding coupled inductor, and an <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> -layer stacked switched capacitor. The proposed converter regulates the output voltage using turn ratios ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$n_{1}$ </tex-math></inline-formula> and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$n_{2}$ </tex-math></inline-formula> ) of the coupled inductor, stacked layers <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m$ </tex-math></inline-formula> of the switched capacitor, and duty cycle <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$D$ </tex-math></inline-formula> . The converter possesses the advantages of high voltage gain, continuous input current, the low voltage stress on the switch <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula> , passive clamping circuits, and high efficiency. Essentially, the integration of a three-winding coupled inductor and stacked switched capacitor enhances the voltage gain of the converter. Owing to the low voltage stress on the switch, MOSFET with low ON-resistance can be adopted to reduce the switching and conduction losses. The low input current ripple prolongs the lifetime of the renewable energy module. In addition, the passive clamp circuit recycles leakage inductance energy and limits switch voltage spike. The expansion of stacked switched-capacitor layers can be effectively utilized to further optimization of the high-voltage-gain converter. A detailed analysis of the operating principle and the steady-state analysis are presented. Finally, the converter is verified by a 200-W prototype, and the experimental results are in good agreement with the theoretical analysis.