A Novel Islanding Detection Technique Based on Event Index Value for Reconfigurable Microgrid

This article presents an islanding detection technique based on event index value, which is derived from the superimposed components of sequence impedance with the consideration of all the operating configurations of the microgrid. Voltage and current signals are acquired at the terminal of distributed generators to compute the impedance. The proposed technique successfully discriminates the islanding, and non-islanding events (NIE) under different operating conditions, including zero power mismatch, and hence eliminates the non-detection zone and unwanted tripping due to the various types of NIEs. The detection was performed within half cycle for all the conditions. The proposed technique has been illustrated on a 7-bus reconfigurable microgrid test system. A large number of non-islanding and islanding events have been simulated for a range of power mismatches. The proposed technique has also been verified on the modified IEEE 34-bus system. The obtained results have been compared with the existing techniques reported in the literature, which proves the supremacy of the proposed technique. The effects of sampling frequency and noise have also been studied.