Publication

Abstract : Renewable energy sources have drawn more attention due to advent global warming effects. Among them, solar and wind energy systems have the highest installationsover the past decades. Islanding is one of the major issues that need to be addressed in power system. Islanding is a phenomenon that occurs when a section of utility system containing a distributed generator is isolated from the main grid, but local generation continues to deliver power to loads. Security regarding islanding operation of a grid connected system is highly concerned. Unintentional islanding poses risks to maintenance personnel and can cause damage to load equipment. There are different anti-islanding techniques employed but it is necessary to determine the most effective method in order to detect islanding in shortest possible time. Many of the international grid codes are demanding islanding as a mandatory requirement. This work aims to identify an optimized and cost effective method of anti-islanding using ROCOF and Vector surge (VS) relays. Simulations are done with multiple DGs in MAT LAB SIMULINK and the results show that these relays are efficient and have fast detection time during islanding.