Modeling and control of single-stage boost inverter for grid-connected PV system

The coupled-inductor single-stage boost inverter (CI-SSBI) has been proposed and applied to photovoltaic (PV) power system. The CI-SSBI based grid-connected PV system integrates some characteristics together in one stage, including boost inversion, feeding current to the grid with high power factor, and maximum power point tracking (MPPT). Moreover, system reliability can be improved by using the shoot-through zero states as a normal operation mode. This paper focuses on the control analysis of both bus voltage loop and inner current loop of the proposed PV system. Experimental results are presented to verify the analysis and show the real system performance.