Passive islanding detection technique for multi-DG power system

The use of distributed generators including solar photovoltaic, wind, small hydro, biomass etc. are playing an important role in the restructured power system. However, there are certain issues related to grid integration of DGs including islanding detection. Hence, it becomes an important area of research nowadays for power engineers. There are various islanding detection techniques including passive, active, hybrid, utility, communication based etc. In this paper, a passive islanding detection technique for multi-DGs including solar photovoltaic is presented. Three DGs including solar photovoltaic have been considered in this study. The performance is evaluated on the basis of four parameters i.e. voltage, frequency, positive sequence voltage and negative sequence voltage at the point of common coupling (PCC). This paper considered two practical scenarios for isolation of grid, one due to occurrence of fault and other is intentional disconnection of grid for schedule maintenance of the system. The test system is simulated in DigSILENT Power factory software for detecting the islanding.