Research on Photovoltaic Grid-Connected Control of New Quasi-Z-Source Inverter Based on VSG

As more and more photovoltaic power generation systems are integrated into the power grid, it has brought a huge test to the stability of the power grid. For the purpose of reduce adverse effects of photovoltaic grid-connected on the grid, the paper proposes a novel quasi-Z-source inverter grid-connected structure on the strength of Virtual Synchronous Generator (VSG). The structure can be divided into two parts. The first part is the control part based on virtual synchronous generator technology. The second part is the boost part based on the novel quasi-Z-source fabric. That proposal of this structure not only simplifies the structure of the traditional two-stage step-up inverter, but also significantly improves the step-up capability. At the same time, it also solves the problem of low inertia and non-damping characteristics the grid-connected photovoltaic power generation system. The combination of the two improves the dynamic performance and stability of the system. Finally, through analysis of this results that the simulation experiment, the feasibility is verified.