Problems of using pumped storage power plants to improve the reliability and controllability of electric power system of the republic of UzbekistanMurodilla Mukhammadiev, Boborakhim Urishev, Shirin Esemuratova and Nigina DjumaniyozovaE3S Web Conf., 139 (2019) 01009DOI: https://doi.org/10.1051/e3sconf/201913901009