A Study of Novel Cuk Grid-connected Inverter Based on Double-loop Control

A kind of Cuk grid-connected inverter is proposed for renewable energy power generation. The grid-connected inverter using Cuk input series output parallel circuit, form a new type of non isolated single stage output parallel input series double Cuk inverter circuit. Firstly, On the basis of the topological structure and principle, the double-loop control strategy is researched to enhance its adaptability and robustness. Simulative results show that, the proposed inverter with double-loop control has better dynamic and static performances, with less output current harmonics and better waveform quality.