Abstract:Firstly, the research status of photovoltaic power generation system at home and abroad is introduced, and the conclusion is drawn that there are more theoretical researches and less actual product development. Under this background, the basic structure of photovoltaic power generation system and the topology of the inverter are analyzed, Three kinds of common inverter structures such as power frequency transformer isolated grid-connected type (DC/AC+AC/AC), non-isolated grid-connected type (DC/DC+DC/AC) and high frequency transformer isolated grid-connected type (DC/AC/DC+DC/AC) are compared and studied, and then combining the actual situation of the home to analyze these structures, Based on this, a three-level design scheme of DC/DC+DC/AC/DC+DC/AC is proposed, including three parts of a chopper circuit, a push-pull boost circuit, and an inverter circuit. Finally, the STM32ZET6 microcontroller is used as the core control device of the system, The welding and debugging functions of each hardware card in the photovoltaic power generation system are designed and completed, and the experimental data are obtained by testing the prototype. The experimental results show that the design scheme of DC/DC+DC/AC/DC+DC/AC architecture proposed in this paper is easy to be realized. The experimental prototype has high energy utilization efficiency and stability, small volume, and can meet the requirements of the household.