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Distributed generation (DG) integration necessitates upgrading some distribution system overcurrent relays to directional ones to offer selective protection. The directional feature is conventionally achieved by phase angle comparison between phasors of the fault current and a polarizing quantity, normally a voltage signal. Doubly fed induction generator (DFIG)-based wind turbines constitute an appreciable...
Induction machines are widely used in industrial facilities as motors and increasingly in distributed generation, particularly in wind turbines. The short-circuit current contributed by induction machines in the first cycle following a fault outside the machine can be significant, and common practices for calculating these currents are well established. However, experimental short-circuit tests described...
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