Title :
Synthesis and digital implementation of a reduced order rotor flux observer for IM drive
Author :
Damiano, Alfonso ; Gatto, Gianluca ; Marongiu, Ignazio ; Pisano, Alessandro
Author_Institution :
Dept. of Electr. & Electron. Eng., Cagliari Univ., Italy
Abstract :
This paper deals with the rotor flux detection in induction motor (IM) drives by means of reduced-order observers. The basic structure discussed by Verghese et al. is slightly modified, and a novel observer class is proposed. A detailed stability analysis by the Lyapunov approach is conducted, and the effect of rotor resistance variation is investigated. The discrete time implementation of the observer model is considered, and the Z-transform method is used to ensure the stability of the observer whichever is the adopted sampling period. Experimental investigations are conducted on a direct field oriented (DFO) IM drive to test the online behaviour of the proposed observer class
Keywords :
Lyapunov methods; Z transforms; control system analysis; control system synthesis; digital control; induction motor drives; machine testing; machine theory; machine vector control; observers; power engineering computing; rotors; stability; Lyapunov approach; Z-transform method; control design; control performance; digital implementation; direct field oriented control; discrete time implementation; induction motor drives; observer class; reduced order rotor flux observer; rotor flux detection; rotor resistance variation; sampling period; stability analysis; Convergence; Electric variables control; Electromagnetic coupling; Observers; Predictive models; Robust stability; Rotors; Sampling methods; Stability analysis; State estimation;
Conference_Titel :
Industrial Electronics, 1999. ISIE '99. Proceedings of the IEEE International Symposium on
Conference_Location :
Bled
Print_ISBN :
0-7803-5662-4
DOI :
10.1109/ISIE.1999.798703
