Parameter optimization for active frequency drift with positive feedback islanding detection strategy

Islanding detection is a mandatory function for grid-connected converters.Among all the passive and active islanding detection method,the active frequency drift method is pretty attractive.It injects perturbations in the frequency of the converter output current to achieve islanding detection.The operation principle of such strategy is analyzed in this paper.Non-detection zone(NDZ) and the parameters optimization principle are provided as well.The islanding detection performance is evaluated through theoretical analysis and experimental results.