Two-tier Single-phase Photovoltaic Grid-connected Simulation with DC-DC Conversion and MPPT Control

In this simulation, the front stage of the two-tier single-phase photovoltaic grid-connected system adopts a DC-DC conversion circuit controlled by MPPT to achieve maximum power tracking. The MPPT method employed is perturb and observe. The back stage of the system utilizes a bridge inverter with spwm modulation. A dual closed-loop control strategy is implemented to stabilize the DC bus voltage and achieve unity power factor. The grid connection effect is excellent, and the total harmonic distortion (THD) meets the grid connection requirements. The simulation is accompanied by explanatory documents.