Islanding Detection using Oscillation Frequency
Keywords:
Distributed generation (DG), Anti-islanding protection, Passive protection, Frequency oscillation, Synchronous generator.Abstract
Nowadays, due to increase of renewable energy sources, Distributed Generations (DGs) is an important
role in transmission & distribution systems. Due to poor voltage and frequency regulation, there is DG unintentional
islanding may cause power quality (PQ) deterioration & life threatening. Due to this, islanding operation of
distribution systems is not allowed and the anti-islanding protection is required for the connection of DGs at the subtransmission & distribution networks. There is so many techniques have been proposed. Also there is new method
that is based on synchronous machine oscillation frequency. Algorithm is based on the oscillation frequency of
synchronous machine to distinguish from other events. It use small window of 2.1ms to calculate the oscillation
frequency that enables fast islanding detection. Even though the window is small, result is secure and able to detect
islands when the interrupted power at the disconnected point is less than 3.6% of the DG power. The main
contribution of the proposed method is speed detection improvement.
