Islanding detection using mathematical morphology for distributed generation

The paper presents a novel method for islanding detection based on time domain, non linear signal processing tool called Mathematical Morphology. The method uses Multiresolution morphological gradient (MMG) algorithm to operate on three phase voltages and currents at target DG location. The result of MMG algorithm is used to compute norm of the three phase voltage and current. The ratio of these norms (voltage and current) are used to obtain a norm ratio index for each phase. Norm index for Islanding detection is obtained by summing the norm ratio index of each of the three phases. Norm index is found to be very effective in detecting island in distribution system with distributed generation integration.