Research on Active Disturbance Rejection Control Technology in LCL Grid-Connected Inverter

In the context of large-scale application of distributed generation, grid-connected system is a complex system with strong uncertainty and nonlinear, and its control mode directly affects whether the grid-connected system can operate safely, stably and with high quality. Therefore, based on the mathematical model of LCL grid-connected inverter, a three-order Linear Active Disturbance Rejection Control (LADRC) grid-connected current controller is designed to make real-time observation and compensation for the uncertainty and disturbance of the system. Improve the robustness and control quality of the system. The frequency response method is used to analyze the system's anti-disturbance and tracking performance in detail, and the MATLAB simulation platform is built to verify the effectiveness of the control strategy. The results show that the designed current control strategy can improve the grid-connected current quality, the system's robustness and anti-disturbance.