Power Quality Improvement using STATCOM in Wind Farms with Constant Speed Induction Generator under Unbalanced Grid Faults
This paper presents a mitigation of power quality problems such as shortage of reactive power, voltage fluctuations, voltage and current harmonics due to wind farms connected to the non linear loads. The fault occur in the system are solved by FACTS controller such as STATCOM. The stability of fixed-speed induction generator (FSIG)-based wind turbines can be improved by a STATCOM. Under unbalanced grid voltage dips, the negative-sequence voltage causes heavy generator torque oscillations that reduce the lifetime of the drive train. A STATCOM control structure with the capability to coordinate the control between the positive and the negative sequence of the grid voltage is proposed. This paper also presents current status of mitigation of power quality problems by FACTS controllers.