INVESTIGATION OF SUB-SYNCHRONOUS RESONANCE PHENOMENA IN DFIG BASED WIND FARM WITH TCSC IN DIFFERENT APPROACHES

In the connection of Doubly Fed Induction Generator (DFIG) based wind farms to the grid, it is important to ensure the stability of the system by determining the series compensation ratios in the line in the most appropriate way. If these ratios are not determined well, an increase in electromechanical oscillations called Sub-Synchronous Resonance (SSR) may occur. In order to eliminate such problems, in this study, the changes in different series compensation ratios in the transmission line were examined in detail with the approach of different wind speeds using Thyristor Controlled Series Compensator (TCSC) in DFIG based wind farms. In these analyses, while different wind speeds in DFIG were selected as 9 m/s, 12 m/s and 15 m/s, the series compensation ratios in the transmission line were considered as 60%, 70% and 80%. In these analyses performed in MATLAB/SIMULINK environment, DFIG active power, reactive power, DC bus voltage and angular speed values were examined in detail. As a result of the obtained results, it was observed that when the wind speed in DFIG is 12m/s and the series compensation ratio in the system is 60%, system stability is ensured and the oscillations that occur are quickly damped.