Voltage-Based Hybrid Algorithm Using Parameter Variations and Stockwell Transform for Islanding Detection in Utility Grids

This paper has introduced an algorithm for the identification of islanding events in remotely located distribution grid with renewable energy (RE) sources using voltage signals. Voltage signal is processed Stockwell transform (ST) to compute median-based recognition factor (MIRF). The rate change root mean square (RMS) computed by differentiating RMS respect time (VRCIRF). proposed voltage-based (IRFV) multiplying MIRF and VRCIRF element element. event discriminated from faulty operational simple decision rules peak magnitude IRFV comparing pre-set threshold values. detection method (IDM) effectively identified presence solar energy, wind simultaneous both at a fast period less than 0.05 cycles compared (ROCOV) frequency (ROCOF) IDM that detects 0.25 0.5 cycles. provides minimum non-detection zone (NDZ). efficiently switching events. study performed on IEEE-13 bus test system interfaced generators MATLAB/Simulink environment. performance better methods based use ROCOV, ROCOF discrete wavelet (DWT).