[IEEE 2020 IEEE International Conference on Environment and Electrical Engineering and 2020 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) - Madrid, Spain (2020.6.9-2020.6.12)] 2020 IEEE International Conference on Environment and Electrical Engineering and 2020 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) - Small-Signal Stability Analysis of DFIG-based Wind Turbines Equipped with Auxiliary Control Systems under Variable Wind Speed