Dual Current Loop Control for a Third-Order Passive Damped Filter Based Quasi-Z-Source Inverter

An Impedance Source Inverter (ZSI) offers a solution to low output renewable energy sources, because it provides an unconventional high boost. The interaction of Quasi-Z-Source (qZS) inverter with the load side raises stability concerns. Multiple resonant features need attention when grid is connected. In this paper, feature third order filter based on qZS explored, and DC AC sides dynamic characteristics are analyzed for optimum size selection passive components. Coupled response presented. For input variation, closed loop control established take care multiple feature. A voltage dual current used dynamics respectively. Controllers designed mitigate disturbance. Results provided two design cases (case I, II), damping highlighted, measured results validate methodology.