Ruikuo Liu, Jun Yao, Xuewei Wang, Peng Sun, “Dynamic Stability Analysis and Improved
LVRT Schemes of DFIG-Based Wind Turbines During a Symmetrical Fault in a Weak Grid,”
IEEE Transactions on Power electronics, Volume : 35 Issue : 1, Jan. 2020, DOI: 10.1109/TPEL.2019.2911346