Abstract
Distributed energy resources (DERs) connected to the main grid may experience unintentional islanding. The most widely used technique for islanding detection is the passive is-landing detection method. However, conventional passive methods have wider non-detection zone (NDZ) area. Failure to detect unintentional islanding events impose various issues like voltage & frequency instability, power quality degradation, protective devices malfunctioning, equipment damage, and threats to line workers. This paper presents active islanding detection for parallel inverters in AC microgrid in which the effects of d-axis and q-axis disturbance current injection are analysed and compared. Further, the outcomes of current injection at different parameters through multiple inverters have been shown and discussed. The simulation results of the active islanding detection are obtained using MATLAB/Simulink.
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