Accurate active islanding detection method for grid‐tied inverters in distributed generation

Abstract

An accurate active islanding detection method for grid‐tied inverters in distributed generation using phase disturbance based on grid synchronisation is presented in this study. To have good performance on both power quality and islanding detection, a third‐harmonic injection is generated by a new kind of phase disturbance and the scope of phase disturbance coefficient is precisely defined, besides, for extracting the third‐harmonic component at the point of common coupling accurately, a selective harmonic extraction based on multiple second‐order generalised integrators is also provided. Performances of the proposed method have been studied and confirmed through extensive simulations using MATLAB/Simulink platform.