.PowerSystems.AC3ph.Machines.Asynchron_dfig .PowerSystems.AC3ph.Machines.Asynchron_dfigA doubly fed induction generator is has a second feed to the rotor windings (term_r). A wide range of rotor speeds can be achieved by controlling the AC voltage of term_r. Doubly fed induction generators are popular for wind turbines.
For more information see Partials.AsynchronBase.