Design and Implementation of Energy Storage Photovoltaic Grid-Connected Power Generation System

This paper presents an energy storage photovoltaic grid-connected power generation system. The main power circuit uses a two-stage non-isolated full-bridge inverter structure, and the main control chip is STM32F407. The two coupling modes of the energy storage device are analyzed and compared. The DC-side coupling mode is selected. When the grid is charging the battery, in order to improve the charging efficiency and stability, an independent AC-DC charging circuit is added. The overall structure of the system was designed, and the hardware circuits of each part of the system were researched and designed, including various converter circuits, isolation and drive circuits, and signal conditioning and acquisition circuits. Finally, an experimental prototype was built for verification. The experimental results show that the system is stable and easy to control, it provides a set of feasible and practical design solutions for energy storage photovoltaic grid-connected systems.