DefinePK

Abstract

One of the important issue related to the interconnection of Distributed Generation (DG) systems to grid is islanding. An active islanding detection technique (IDT), which employs Average Absolute Frequency Deviation Value (AFDV¬avg) for the detection of islanding condition, has been proposed in this work. The q-component of inverter’s current is controlled using a current controller. A continuous and periodic signal is the reference signal for the current controller. At the point of common coupling (PCC), the deviation in the frequency is observed when the disturbances of frequency other than fundamental are injected during islanding. The active islanding detection method (IDM) provides lower NDZ (Non Detection Zone) compared to passive detection, thereby enhancing the detection of small deviation in the frequency at the PCC. By measuring the value of deviation in the frequency (AFDV¬avg), the condition for islanding is detected. The islanding condition is reconfirmed by the proposed technique. The reconfirmation of the islanding condition helps to eliminate the false detection of island due to non-islanding switching events. The effectiveness of the technique employed is analyzed with the help of simulation using MATLAB/ Simulink.