TWO-LEVEL VOLTAGE SHIFT OF ACTIVE ISLANDING DETECTION METHOD OF DISTRIBUTED GENERATION

Abstract

In this research, a new active method is proposed to solve the islanding condition by using a two-level voltage shift method developed from the standard voltage shift method. However, this new method is likely to disturb the stability of the system than the voltage shift method because it shifts less voltage level to detect islanding condition. In addition, the voltage shift method is to reduce or increase the voltage level to detect islanding condition for under-voltage relay (UVR) or over-voltage relay (OVR) work. Simulation results on Matlab/Simulink show that the two-level voltage shift of the active islanding detection method can determine anti-islanding condition very quickly, within 0.04 seconds, thought it does not have a nondetection zone and also it is less likely to disturb the stability of the system than the voltage shift method.