Passive Islanding Detection Techniques Using Synchrophasors for Inverter Based Distributed Generators

Islanding detection is an important protection aspect in microgrid operation. In this paper, synchrophasor based islanding detection schemes are discussed with their drawbacks. The dependence of voltage and frequency variation on real and reactive power mismatches is shown. Synchrophasor data like voltage phase angle, frequency, rate of change of frequency are studied for their application in islanding detection. Further, nuisance tripping of islanding relays during fault conditions are analyzed and remedies are suggested. An inverter interfaced distributed generation powering an RLC resonant tank load is simulated in RSCAD/RTDS environment to study the considered islanding detection parameters.