Setting and Algorithm Simulation of Pv Anti-islanding Protection in Case of Increased Frequency Threshold

UOVR and UOFR as passive anti-islanding methods lack of sensitivity to detect islanding. The performance gets worse when the frequency threshold is increased from 50.2 Hz to 50.6 Hz. For instance, dedicated passive methods such as ROCOF help the inverter to detect islanding. When active methods such as SFS and SVS are activated, the number of detected islandings is increased to 87.5%. To improve the number of detected islanding and to reduce the number of false trippings, an under voltage blocking scheme and zero crossing detection are implemented. As results, the inverter could detect 100% of islanding event with 13.3% of false tripping. As future work to reduce the number of false tripping, a study implementing impedance measurement with a closed loop simulation could be done.