Study on three-phase photovoltaic grid-connected inverter based on current deadbeat control

In order to make the photovoltaic (PV) grid-connected power generation system output high-quality electric power, the paper proposes a three-phase photovoltaic grid-connected inverter current deadbeat control PWM algorithm based on the principle of deadbeat control, and presents an overall control strategy based on current deadbeat control of double-stage photovoltaic grid-connected inverter. This control strategy includes MPPT (Maximum Power Point Tracking) loop, DC voltage loop and AC voltage loop. Simulative results verify the efficacy of current deadbeat control based on Matlab/Simulink. Finally, the proposed control strategy is applied to 10 kW photovoltaic grid-connected inverter, and the experimental results verify the accuracy and validity of grid-connected control strategy and the good dynamic and steady-state characteristics of the PV power generation system. The experimental results also show that the three-phase current total distortion rate is less than 3%, which is better than the data provided in the national standard, and net power factor is equal to 1.