Comparison of PI and FUZZY Logic Controller Based STATCOM in Wind Turbine Fed FSIG under Asymmetric Faults.

This paper presents detailed analysis to compare the performance of wind turbine under assymmetric faults using static compensator with PI and Fuzzy logic controller. A static compensator control structure is used to compensate the positive and negative sequence voltage compensation under different fault conditions as the negative sequence voltage causes heavy torque oscillations that reduces the life of the drive train. The direct quadrature axis theory is the vector control method used in static compensator. This method aims to compensate positive and negative sequence voltages. Simulations have been carried out with PI controller and fuzzy logic controller based STATCOM in Matlab/Simulink. comparative analysis has been carried out for the direct quadrature control strategy of different assymmetric faults and analyze the direct and quadrature axis of current and voltage, torque, speed, active and reactive power. The fuzzy logic controller gives better performance than PI under asymmetric faults and suppresses the torsional oscillations thereby improving the overall performance of the system.