Description: the repetitive dual closed-loop control strategy based on grid current feedback was proposed in this paper. The LCL filter was stable due to effective utilization of inherent one-beat delay of digital control. Based on the inner closed-loop transfer function, the corresponding notch filter, the second-order filter and lead-link were designed as a compensator of epetitive control. The gird voltage and current reference feed-forward control suppressed grid disturbance and increased dynamic tracking performances. Theoretical analysis and experimental results show that, the proposed method has the advantages of high steady accuracy, fast dynamic response and strong robustness.
To Search:
File list (Check if you may need any files):
20171016.pdf
Download