PQ Control-based Novel Passive Islanding Detection Method for Renewable Energy Application

Islanding phenomenon is often undesirable for microgrids because it may interrupt power services, and cause damage to the equipment. At times, islanding is also required to isolate any potential problem. Anti-islanding methods can detect the islanding, causing the distributed generators (DGs) to stop providing power to the loads in microgrids, the passive islanding techniques are easy implementation, but the non-detection zone (NDZ) of them is too large. This paper presents a method to reduce the NDZ of passive islanding techniques by controlling the output power of the inverters. A structure of hybrid AC/DC microgrid is under operating with the anti-islanding method. The over/under voltage (OUV) and over/under frequency (OUF) methods are used to detect the islanding phenomenon at the point of common coupling (PCC) to ensure all power generated by DGs can be fully utilized. The proposed system is developed in MATLAB/SIMULINK environment and tested for the results.