C. Pacis, Michael, and Iman Mir. “Grid Synchronization and Control of a Doubly Fed Induction Generator (DFIG) Wind Turbine Using Unified Power Flow Controller (UPFC)”. International Journal of Engineering & Technology, vol. 7, no. 4.38, Dec. 2018, pp. 1669-72, https://doi.org/10.14419/ijet.v7i4.38.29230.