Analysis of Passive Islanding Detection Techniques for Double Line Fault in Three Phase Microgrid System

Microgrids are able to dispatch power distribution systems with the advancement of electronics-based inverters. As per IEEE-1547-2018 standards, Microgrid has maintain voltage 0.88 < V 1.1 p.u (per unit) and frequency 58.8< f_0 61.2 Hz detect un-intentional faults in less than 2 seconds bring into islanding mode seamlessly. Unless these detected is islanded, system stability cannot be maintained feed connected loads. To unsymmetrical faults, stable during non-islanding cases like loads switch on throw off at Point Common Coupling (PCC), a passive detection method, Rate Of Change Voltage Phase Angle (ROCOVPA) proposed. The methodology simple. First, phase angle generator bus grid monitored. Then, absolute value found finally differentiated get ROCOVPA islanding. Also, this technique compared widely used method Frequency (ROCOF) different percentage active reactive mismatches. It also avoids nuisance tripping so that Microgrid's maintained. This tested for un-symmetrical double line fault, or off, linear non-linear In quality not affected because no perturbations testing Non-Detection Zone (NDZ) almost zero. proposed verified by simulating conditions MATLAB/Simulink comparing ROCOF effective.