Islanding Detection Method for Inverter Based Distributed Generation Based on Combined Changes of Rocoap and Rocorp

Nowadays, renewable energies are very crucial and have a special place in the world. Renewable-energy resources are utilized by most of the Distributed Generations (DG) in the grid interconnected power system. Due to the advantages of renewable energy resources like clean nature, pollution free, cost free, the use of they are increasing in daily life. The major problems due to such distributed generators are an unintentional islanding phenomenon. Islanding occurs when a Distributed Generation continues to energize a part of a power system which was isolated from the main power grid. Since islanding can cause hazardous conditions for people who are working and equipment connected to it. So it is required that according to IEEE 1547 standards, we have to detect the phenomena of islanding within 2 Sec with the apparatus connected to it. In this paper, a new hybrid passive method to identify islanding states has been proposed, based on the combined changes of the rate of change of active power (ROCOAP) and rate of change of reactive power (ROCORP) at the point of common coupling (PCC). Even the inverter is placed or not this method will give a better result. Due to hybrid nature, the performance of this method was better compared with the previous methods. The performance test system results, are carried on the MATLAB / Simulink environment shows, the strength of this method.