Compared with traditional Z-source and quasi-Z-source inverter, switched-inductor quasi-Z-source has higher booster multiple, lower capacitance stress, and higher conversion efficiency. Therefore, it is very suitable for grid-connected photovoltaic power generation system. This paper analyzes the voltage boosting theory of the switched-inductor quasi-Z-source inverter which is applied to grid-connected photovoltaic power generation system. For the imbalanced power grid voltage sag situation, this paper puts forward a low voltage ride-through (LVRT) control strategy. System realizes the unity power factor running and has a good LVRT ability under imbalanced power grid voltage sag. At last, the simulation and experimental results are shown to verify the correctness of the control method.

Topics
Transformer, Electrical properties and parameters, Inverters, Power supply circuits, Inductors, Photovoltaics, Electrical grid, Maximum power point tracking, Atmospheric radiation, Control theory
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