A new passive islanding detection technique for different zones in utility grid

Distributed generation (DG) has reformed the meaning of traditional power from large-scale to small-scale generation. The main issue connecting DG utility grid is detection unintended islanding. This paper shows impact islanding phenomenon in case grid-connected photovoltaic arrays and how develop a convenient technique detect this phenomenon. A passive algorithm proposed for all types DGs by varying analyzing DC-link voltage source converter inverter. applied on low medium scales. Furthermore, comparison applying with resistance load two scales presented. In addition, anti-islanding protection performed compared lot techniques such as underfrequency, overfrequency, rate change frequency according time simulation results using MATLAB/ SIMULINK platform illustrate effectiveness method.