Abstract:The Z-source inverter can overcome the shortcomings of incompatibility between boost and inverter, but its boost capability is limited by the modulation factor in the inverter circuit and cannot give full play to its advantages. While the existing improved technology increases the boost capacity, the withstand voltage level and cost of the device are correspondingly raised. In response to this shortcoming, by combining the improvement ideas of power embedded, a high gain and high fault tolerance performance are proposed, which is power supply embedded switching inductor Z-source inverter topology. Compared with the Z-source inverter, it not only the boost capacity is greatly improved, but also has a stricter symmetrical structure, and reduces the capacitor stress and the inrush current at startup, thereby reducing the cost and volume of the inverter. In addition, it can also operate in the photovoltaic power generation system under some adverse conditions such as single power supply open circuit, short circuit and dual power supply voltage imbalance. Finally, the photovoltaic grid-connected simulation model was built and verified on the StarSim HIL experimental platform. The experimental results verified the correctness and feasibility of the inverter, and the grid-connected inverter can be completed more effectively.