μPMU-based islanding detection method in power distribution systems.

• Employs the typical hardware structure of μPMUs. • The islanding condition is determined locally at each DG bus by a simple detection procedure increases the grid resiliency in case of communication links interruptions. • No need to change or recalculate the threshold values with the change of the grid topology. • It is applicable in networks with inverter based and synchronous based DGs. • Discriminates islanding phenomena from other perturbations within 0.1 or 0.12 s with zero NDZ. This paper focuses on the use of micro-phasor measurement units (μPMUs) for the prompt detection of unplanned islanding conditions. The investigated method is based on the monitoring of voltage and current phasors at distributed generation (DG) buses equipped by μPMUs. The difference between two consecutive phasors (voltage phasors and current phasors) are monitored until a perturbation occurs. When a perturbation is detected, the first phasor, called pre-disturbance phasor, is kept fixed and the second one, called post-disturbance phasor, is continuously updated with each new sample arrival. The differences between the pre-disturbance and post-disturbance phasors are calculated and summed up for a predefined time window. When this exceeds a predefined threshold, the island condition of the related bus is detected. The presented procedure can distinguish the islanding condition from other perturbations, such as motor starting, faults, and capacitor switching. The performance of the proposed procedure, as well as its sensitivity to the system conditions and predefined values, are analyzed considering a 7-bus distribution system and the IEEE 33-bus test system, both with synchronous generators and inverter-based DGs. [ABSTRACT FROM AUTHOR]