The adaptive sliding-mode observer has been widely used to estimate the rotor flux and rotor speed in inverter-fed sensorless induction motor drives. However, the technique requires setting a priori the sliding-mode observer constants and also knowledge of the induction motor parameters. This particular aspect can cause significant errors in the estimation of the rotor speed used in sensorless control schemes. Changes in the induction machine parameters due to temperature or different saturation levels will affect the dynamic operation of the observer despite its adaptive nature. In this context, a sensitivity study of the adaptive sliding-mode observer is presented and discussed in this paper. Various experiments are performed on a sensorless indirect vector-controlled induction motor drive under a variety of conditions to verify the observer robustness.
2. Zhang, Y. and V. Utkin, "Sliding mode observers for electric machines-an overview," IEEE 2002 28th Annual Conference of the Industrial Electronics Society, IECON 02, Vol. 3, No. 5--8, 1842-1847, 2002.
doi:10.1109/IECON.2002.1185251
3. Lascu, C. and G.-D. Andreescu, "Sliding-mode observer and improved integrator with DC-o®set compensation for flux estimation in sensorless-controlled induction motors," IEEE Transactions on Industrial Electronics, Vol. 53, No. 3, 785-794, 2006.
doi:10.1109/TIE.2006.874275
4. Lascu, C., I. Boldea, and F. Blaabjerg, "Comparative study of adaptive and inherently sensorless observers for variable-speed induction-motor drives," IEEE Transactions on Industrial Electronics, Vol. 53, No. 1, 57-65, 2006.
doi:10.1109/TIE.2005.862314
5. Proca, A. B. and A. Keyhani, "Sliding-mode flux observer with online rotor parameter estimation for induction motors," IEEE Transactions on Industrial Electronics, Vol. 54, No. 2, 716-723, 2007.
doi:10.1109/TIE.2007.891786
6. Lubin, T., S. Mezani, and A. Rezzoug, "Improved analytical model for surface-mounted pm motors considering slotting effects and armature reaction," Progress In Electromagnetics Research B, Vol. 25, 293-314, 2010.
doi:10.2528/PIERB10081209
7. Lascu, C., I. Boldea, and F. Blaabjerg, "A class of speed-sensorless sliding-mode observers for high-performance induction motor drives," IEEE Transactions on Industrial Electronics, Vol. 56, No. 9, 3394-3403, 2009.
doi:10.1109/TIE.2009.2022518
8. Sheng, Y. and V. Ajjarapu, "A speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generator-based variable-speed wind turbines," IEEE Transactions on Energy Conversion, Vol. 25, No. 3, 891-900, 2010.
doi:10.1109/TEC.2009.2032589
9. Gadoue, S. M., D. Giaouris, and J. W. Finch, "MRAS sensorless vector control of an induction motor using new sliding-mode and fuzzy-logic adaptation mechanisms ," IEEE Transactions on Energy Conversion, Vol. 25, No. 2, 394-402, 2010.
doi:10.1109/TEC.2009.2036445
10. Hasan, S. and I. Husain, "A Luenberger-sliding mode observer for online parameter estimation and adaptation in high-performance induction motor drives," IEEE Transactions on Industry Applications, Vol. 45, No. 2, 772-781, 2009.
doi:10.1109/TIA.2009.2013602
11. Ghanes, M. and G. Zheng, "On sensorless induction motor drives: Sliding-mode observer and output feedback controller," IEEE Transactions on Industrial Electronics, Vol. 56, No. 9, 3404-3413, 2009.
doi:10.1109/TIE.2009.2026387
12. Hadef, M., M. R. Mekideche, A. Djerdir, and A. Miraoui, "An inverse problem approach for parameter estimation of interior permanent magnet synchronous motor," Progress In Electromagnetics Research B, Vol. 31, 15-28, 2011.
13. Lascu, C. and G.-D. Andreescu, "Sliding-mode observer and improved integrator with DC-o®set compensation for flux estimation in sensorless-controlled induction motors," IEEE Transactions on Industrial Electronics, Vol. 53, No. 3, 785-794, 2006.
doi:10.1109/TIE.2006.874275
14. Foo, G. H. B. and M. F. Rahman, "Direct torque control of an IPM-synchronous motor drive at very low speed using a sliding-mode stator flux observer ," IEEE Transactions on Power Electronics, Vol. 25, No. 4, 933-942, 2010.
doi:10.1109/TPEL.2009.2036354
15. Iqbal, M., A. I. Bhatti, S. I. Ayubi, and Q. Khan, "Robust parameter estimation of nonlinear systems using sliding-mode di®erentiator observer ," IEEE Transactions on Industrial Electronics, Vol. 58, No. 2, 680-689, 2011.
doi:10.1109/TIE.2010.2046608
16. Foo, G. H. B. and M. F. Rahman, "Direct torque control of an ipm-synchronous motor drive at very low speed using a sliding-mode stator flux observer ," IEEE Transactions on Power Electronics, Vol. 25, No. 4, 933-942, 2010.
doi:10.1109/TPEL.2009.2036354
17. Kim, IL-S., "A technique for estimating the state of health of lithium batteries through a dual-sliding-mode observer," IEEE Transactions on Power Electronics, Vol. 25, No. 4, 1013-1022, 2010.
doi:10.1109/TPEL.2009.2034966
18. Hasan, S. and I. Husain, "A Luenberger-sliding mode observer for online parameter estimation and adaptation in high-performance induction motor drives," IEEE Transactions on Industry Applications, Vol. 45, No. 2, 772-781, 2009.
doi:10.1109/TIA.2009.2013602
19. Ghanes, M., J. de Leon, and A. Glumineau, "Cascade and high-gain observers comparison for sensorless closed-loop induction motor control," Control Theory & Applications, IET, Vol. 2, No. 2, 133-150, 2008.
doi:10.1049/iet-cta:20070058
20. Mahmoudi, A., N. A. Rahim, and H. W. Ping, "Genetic algorithm and ¯nite element analysis for optimum design of slotted torus axial-°ux permanent-magnet brushless DC motor ," Progress In Electromagnetics Research B, Vol. 33, 383-407, 2011.
doi:10.2528/PIERB11070204
Submit
