An effective PV power generation control system using quasi-Z source inverter with battery

The paper proposes a novel PV power generation system, through employing the quasi-Z source inverter with battery, to balance the stochastic fluctuations of PV power, and smooth the power injected to the grid/ load. The analytical model is built to analyze the power and current relationships among the PV panel, battery, and the inverter output. The capacitor voltage outer loop with a battery current inner loop ensures a constant dc link peak voltage for a wide range of PV voltage, an incremental load based maximum power tracking achieves the PV panels operating at the maximum power point, even for a wide variation of solar irradiation and temperature. The simulated and experimental results verify the proposed novel PV interface inverter and its control principle.