The grid-connected photovoltaic (PV) system power generation is the most important way in the solar energy application area, and has broad prospects. In PV system, the grid-connected inverter is a critical component responsible for the control of electricity flow between the PV module and power grid. Nowadays, the topology and control strategy of PV inverter has become the research hotpot. Z-source inverter is a single-stage system. It has some advantages such as simple structure, high reliability of the in...