Build a distributed photovoltaic grid-connected power generation system based on MATLAB. Firstly, establish a mathematical equivalent model of the photovoltaic cell, Boost the DC voltage through the Boost circuit, and further track to the maximum power based on the conductance increment method. Secondly, the mathematical model of the three-phase inverter is constructed and the SVPWM modulation method is applied to control the inverter, and the grid connection is achieved in combination with the control strategy. Considering the performance limitations of traditional PI control, a dual decoupling strategy combining current feedback compensation and voltage feedforward compensation was adopted, and a parameter optimization method aimed at harmonic suppression was established. Finally, the effectiveness of the proposed method is verified through harmonic analysis of the grid-connected voltage and current. The distributed grid-connected power generation system built has a grid connection frequency of 50 Hz, a power of 15,239 W, a grid connection voltage of 310 V, and a current harmonic rate within 5%, meeting the grid connection requirements.