Grid-Connected Inverter DC Voltage Self-Immunity Control Strategy Based on 5G+Photovoltaic Power Prediction Feedforward

To mitigate the issues of voltage instability and slow response speed in grid-connected photovoltaic (PV) systems caused by PV output fluctuations and delays or packet losses in network transmission, an improved active disturbance rejection control strategy is proposed. Specifically, a two-stage PV grid-connected power generation system topology is established, and the traditional control method of the voltage outer loop and current inner loop is thoroughly analyzed. On this basis, a 5G+ PV power prediction feedforward segment is added. By combining adaptive functions with the Variable Gain Sliding Mode Linear Active Disturbance Rejection Control (VGSM-LADRC) strategy, adaptive adjustment of voltage control is achieved. Simulation results show that compared to traditional control strategies, the proposed strategy reduces the peak value of DC voltage fluctuations by 0.73V and decreases the DC voltage overshoot by 27.5%.