Asynchronous machine 1 DC injection 1 DFAM 1 Doubly feed asynchronoi machine 1 Doubly-fed 1 Doubly-feed asynchronoi machine 1 Energy efficiency 1 Energy efficient 1 Energy efficient start-up Hydraulic turbines 1 Hydroelectric pumped storage plant 1 Pumped storage plants 1 Pumped storage power plants 1 Pumps 1 Smooth starting 1 Speed 1 Start-up strategy 1 Stators 1 V/f start-up strategy 1 Winding 1 doubly-fed asynchronous machine 1 energy efficient start-up 1 hydroelectric pumped storage plant 1 smooth starting 1