Abstract:

A new anti-islanding protection technique was proposed based on the characteristic of faulted current. This method artificially created short circuit in the port of distributed generator to produce a faulted pulse current, which could effectively reflect the change of the system impedance. The islanding status could be judged through monitoring and analyzing the faulted pulse current. The equation of the faulted pulse current was derived, and the criteria for the islanding determination were set up. Disturbance between signals and the effect on the system were also analyzed. Finally, this method was validated by theoretical analysis and computer simulation.

Key words: anti-islanding protection, faulted current, power quality