Abstract
Integrating Distributed Generation (DG) into power system networks causes several difficulties. Islanding is one of the problems associated with system protection which takes place when a DG unit (or group of units) continues to energize a part of the load that has been separated from the main utility. In this paper, the islanding problem is investigated to get an efficient technique for islanding detection. The proposed technique is based on the Rate of Change of Zero Sequence of Second Harmonic Voltage. The technique is tested for an inverter-based DG includes wind turbines with double-fed induction generator (DFIG). The proposed method could distinguish the islanding case correctly within only one cycle without non-detection zone (NDZ). In addition, it could differentiate between the islanding cases at different values for active and reactive power mismatch and other cases such as normal load variation/capacitor switching, etc. Furthermore, power quality disturbances such as voltage sags and swells, faults and outage of one of DGs are tested.
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