Islanding Detection in a Distribution System with Photovoltaic (PV) System as Distributed Generation

Objectives: One of the most crucial problems of distributed generation is islanding detection in power system. In this paper, the variation of frequency and THD value of voltage waveform at PCC will be studied for islanding detection diagnosis. Statistical Analysis: Islanding detection methods are classified as local and remote islanding detection. In that local methods are categorized as passive and active methods. These two methods are based on changing in parameters such as frequency, voltage and current harmonics. But these methods have some challenges such as reduction in power quality and large Non Detection Zone (NDZ) whereas remote methods doesn’t contains NDZ but not economically suitable for small networks. The studied system was considered by following the standard IEEE-1547 and UL-1741.This work is performed to determine islanding detection in power system. Findings: Whenever the grid disconnects from the power system there will be variations in frequency and THD value of voltage waveform at PCC. These variations will be taken as reference for islanding detection and generates trip signal for DG. Application/Improvements: This work is used in various power system applications. Simulation results using SIMULINK software on the power shows the effectiveness of proposed method.