High-Robustness Capacitor Voltage Active Damping Based on Model Free Predictive Current Control for ANPC GCI with LCL Filter

To enhance the robustness and adaptability of the three-level active neutral point clamped grid-connected inverter (ANPC GCI) under weak power grid conditions, a model-free predictive current control (MFPCC) based high-robustness capacitor-voltage active damping (CVFAD) is proposed in this paper. Firstly, to improve the control performance of the inverter under parameter mismatches, an MFPCC based on an observer is designed. Secondly, high-robustness CVFAD is devised to suppress the LCL resonance peaks and enhance the adaptability of the model under the weak power grid. Finally, the effectiveness and reliability of the proposed method are verified through simulation validations and hardware experiments.