Islanding detection of a distributed generation system using angle between negative sequence voltage and current

This paper proposes a new passive local islanding detection technique for a distributed generation (DG) system connected to a utility grid. In the proposed method the absolute value of angle between the negative sequence components of voltage and current is estimated at the DG end and is used to recognize the islanding condition. The conventional passive methods have the drawback of non-detection zone (NDZ). The active islanding detection methods introduce disturbance in power system. A micro grid system is simulated using PSCAD/EMTDC software. Several test cases are generated to test the performance of the proposed technique.