Advanced Active Islanding Method With Recursive Least Square for Microgrid

Islanding is one of the challenging task for micro grid system. There are various types of islanding methods. Local Methods also classified as passive, active and hybrid method. Passive islanding methods are easy to execute, cheaper for multi DG system but have large non detection zone (NDZ). A very few active and hybrid methods were tested on multi DG system till now. In this paper, a new method is proposed for DGs connected in parallel considering recursive least square algorithm (RLS) at point of common coupling (PCC) for islanding. There are various parameters like voltage, current, frequency, impedance, harmonics etc used to detect the islanding. Here a frequency of active frequency drift (AFD) current with RLS is considered as variable parameter. Further comparative analysis done between conventional active and passive methods with proposed method. In a proposed method a variation of estimated frequency signal generates the tripping signal in fast manner as compare to other methods. The simulation results are analysed based on MATLAB software and verified the same by implementing prototype hardware experimental setup. The analysis shows that estimation of frequency for current of AFD with RLS approach is more suitable for islanding during zero power mismatch condition.