Grid-connected PV system based on the series Z-Source inverter

This paper proposes a grid-connected PV system based on the series Z-Source inverter, and also proposes an indirect DC-link voltage control method for the system. The operation principle of the system is presented. The current control strategy is also designed, which makes the output current synchronize with grid voltage, thus the system could transform power to utility grid with a unit power factor. Simulation and experimental results demonstrate that the proposed system could be applied in PV system with a wide input voltage range, and that the quality of current is very well, which verify the correctness and validity of the analysis.