A Survey of Islanding Detection Methods for Microgrids and Assessment of Non-Detection Zones in Comparison with Grid Codes

Detection of unintentional islanding is critical in microgrids order to guarantee personal safety and avoid equipment damage. Most detection techniques are based on monitoring detecting abnormalities magnitudes such as frequency, voltage, current power. However, normal operation, the utility grid has fluctuations voltage codes establish that local generators must remain connected if deviations from nominal values do not exceed defined thresholds ramps. This means methods could detect there code requirements, known non-detection zone (NDZ). A survey benefits provided, showing advantages disadvantages each one. NDZs size most common passive calculated obtained by simulation compared with limits ENTSO-E standards function requirements compare effectiveness different suitability