Abstract
Connection of large wind generation to the power system has been resulted poor power quality and poor stability margins. After a severe disturbance occurrence characteristic of fixed speed induction generators, the instability in wind farms based on FSIG is severally created by the extreme reactive power absorption. This phenomenon is a result of rotor slip of FSIG increase during the fault, and consequently, the consumption of reactive power is increased. This requires that methods to improve power quality and stability for such systems. This paper investigates how a PSS and UPQC mitigate the speed oscillation and voltage fluctuations are created by faults in grid. The simulation results are carried out by PSCAD/EMTDC software and it demonstrate that power quality and the stability margin can be improved significantly for wind farms by UPQC.
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