Reliable Applicant for Passive Approach-Based Anti-Islanding Protection for Different Grid Penetration Levels of Inverter-Based Distributed Generation

Abstract

Anti-islanding (AI) of distributed generation (DG) source(s) is mandatory whenever DG source(s) integrated into a power system network are islanded due to unplanned loss of grid (mains supply) as per DG interconnection standards. This is necessary because if an unplanned island is allowed to sustain then it can cause damage to system equipment(s) connected and the lineman (working at that location) might receive a shock. Among different anti-islanding protection techniques, passive approach-based are the simplest to design and implement. In this context here, an attempt has been made to obtain reliable passive applicants to be employed for anti-islanding protection. Reliability refers to the capability of an applicant to discriminate accurately between islanding and non-islanding events. Here a set of ‘8’ passive applicants i.e. point of common coupling (PCC) voltage, current at PCC, the frequency at PCC, phase angle, active power and reactive power at PCC, total harmonic distortion (THD) of PCC voltage and current respectively are considered. Among these applicants, the best (reliable) applicant is obtained for different levels of inverter DG penetration into a 2-bus network for different switching events by employing a relevant prioritization technique in MATLAB/SIMULINK environment.