<p>This article proposes a novel high step-up isolated converter with integrated active switched-capacitor cell for dc microgrid applications or micro-inverter system. The proposed converter has the advantages of continuous input current, high voltage gain, low switch voltage stress, and high efficiency brought by soft switching of active devices (switches and diodes). The active switched-capacitor (ASC) converter provides zero-current switching (ZCS) turn on for switches and ZCS turn off for diodes. A fractional-order model of the converter is established by the fractional-order theory, and the fractional-order PI^λD^μ compensator is designed to realize the closed-loop control of the converter. Finally, a 200&#xa0;W prototype has been constructed to verify the functionality of the proposed converter, with an input voltage 48&#xa0;V and an output voltage of 380&#xa0;V.</p>