Investigation of Active and Passive Islanding Detection Techniques

This paper presents an investigation of different islanding detection techniques which focus on operating parameters. These parameters are to decide whether the system will be islanded or not. The process is based on measuring the voltage, frequency and phase angle at the point of common coupling. The rate of change must be integrated to distinguish the changes in the system, the rate of change are including the change of voltage, rate of change of frequency (ROCOF), rate of change of phase angle difference (ROCPAD). In non detective zones the need of active techniques are also needed to decide if the system in the permissible range of international standard or not. The study is focusing on the ability of each technique and the ranges which is cable of distinguishing the operation. The proposed technique use different method of islanding detection and different cases of loading and compare them to determine the margin and zones that each method can operate effectively in it and the situation that fails. Keywordsrate of change of voltage, ROCOF, ROCPAD, non Detective Zones (NDZ).