Absolute Positive Sequence Voltage Difference Based Passive Islanding Detection in Micro Grids

In this paper, a new passive islanding detection method is developed for a grid integrated hybrid distributed generation (DG) system that utilizes absolute positive sequence voltages difference mean (APSVDM) from the point of common coupling (PCC). Islanding is recognized when the magnitude of the APSVDM exceeds the threshold over a specified delay time. Under different operating situations, including zero power mismatches, the proposed technique effectively distinguishes between cases of islanding (IS) and non-islanding (NIS) cases. As a result, non-detection zone and false tripping caused by various NIS events are eliminated. The technique suggested is straightforward and needs no classifier to implement. This method does not depend on the specifics of the utility network, and it can be used with any number and type of DG units. When compared to times reported in the literature, the achieved detection times show that the proposed method is superior. OPAL-RT, a Hardware-in-the-Loop (HIL) environment, and MATLAB are used to validate the results of the experiments.