Research on Fuzzy Active Disturbance Rejection Control of LCL Grid-Connected Inverter Based on Passivity-Based Control in Weak Grid

In response to the problems of impedance variation and rich background harmonics in weak grid environment traditional LCL grid-connected inverters, which cause distortion current reduce stability entire system, this paper proposes a passive fuzzy-active disturbance rejection control strategy. Firstly, passivity-based (PBC) is introduced into inverter system ensure global system. Secondly, order solve problem difficult selection inverter-side current, active (ADRC) used directly track avoiding tracking error AC signal suppressing interference voltage. The combination fuzzy ADRC simplifies parameter tuning process, FUZZY-ADRC outer loop PBC inductance inner are combined form multi-loop Finally, simulation comparison verifies that proposed strategy can effectively suppress improve quality enhance environment.