Sensorless Direct Voltage Control of the Stand-Alone Slip-Ring Induction Generator. - Grzegorz Iwanski; Wlodzimierz Koczara (IEEE Trans. Ind. Electron., 2007)

DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications. - Grzegorz Iwanski; Wlodzimierz Koczara (IEEE Trans. Ind. Electron., 2008)