Transient current analysis of induction generator for wind power generating system

In this paper, we present transient current analysis of induction generators used in wind power system before and after three-phase fault conditions. At first basic equations of induction generator, connected to infinite bus, are developed and then transient current analysis formulas are deduced for a three-phase fault before and after fault clearance. Furthermore, it is derived that the initial phase angle for the three-phase fault or restore phase angle of power supply voltages and the time at which maximum or minimum transient currents flow in the system.