Research on LADRC of Grid-Connected Inverter Based on LCCL

A grid-connected inverter’s stability is easily influenced by the system’s internal and external characteristics, especially when inverter connected to grid an LCL filter, which complicates system design operating conditions. To handle problem of disturbance in high-order inverter, a linear active rejection control (LADRC) strategy based on LCCL (which divides capacitor filter into two halves specified proportion) proposed this paper. First, reduced from third order first using split method, solves difficulties complicated controller easy resonance. Meanwhile, disturbances are treated as generalized disturbances. Then, LADRC used adjust closed-loop parameters, enhances quality current stability. Finally, impacts PI power mutation voltage drop compared experiments. The experimental results show effectiveness strategy.