Mahmoud M.A. Aref was born in Sohag, Egypt in 1984. He received B.Sc and M.Sc from electrical engineering, Assiut university in 2006 and 2012 respectively. He received PhD from electrical engineering, Ural Federal University, Russia in 2020. He is employing by the Electrical Engineering Dept. of Assiut University, Egypt as assistant professor, researcher. Currently he is a researcher in Ural Federal University, Russia. His research interests include stability and reliability of renewable sources connected to electrical power systems. E-mail: mahmoud.aref@eng.aun.edu.eg