The problem of output feedback control of doubly fed induction motor (DFIM) is considered in this paper. In particular the technique of multirate output feedback (MROF) has been employed. The challenge in control of DFIM is the nonlinear nature of torque and speed dynamics which prevents direct application of MROF techniques. We have proposed a novel strategy to achieve the torque and speed tracking via state reference tracking. The linear equations of doubly fed induction motor are utilized for application of MROF and the state reference commands are computed from torque and speed reference commands separately. The proposed output feedback controller is shown to be tracking given torque and speed commands.

Doubly-fed Induction Motor; Output Feedback; Multirate Output Feedback; Fast Output Sampling; Sensorless Control.

[1] M Ahmad, M R Khan, AIqbal, and AtifIqbalMukhtar Ahmad, M.Rizwan Khan. “ A Doubly Fed Induction Motor as High Torque Low Speed Drive.” In International Conference on Power Electronic, Drives and Energy Systems, pages 1–3, 2006.
[2] B. Baby Priya and AChilambuchelvan. “ Steady-state Analysis of Doubly Fed Induction Machiness for Wind Turbines using MATLAB.” International Journal of Renewable Energy Technology, 1(2):192–210, 2009.
[3] S. Drid, M. S. Nait-Said, and M. Tadjine.“ Double flux oriented control for the doubly fed induction motor.” Electric Power Components and Systems, 33(10):1081–1095, 2005.
[4] Jiabing Hu Jiabing Hu and Bin Hu Bin Hu.“ Direct Active and Reactive Power Regulation of Grid Connected Voltage Source Converters using Sliding Mode Control Approach.” IEEE Transactions on Energy Conversion, 25(4):1028–1039, 2010.
[5] Tomomichi Hagiwara and Araki Mituhiko.”Design of a Stable State Feedback Controller Based on the Multirate Sampling of the Plant Output.” IEEE Transactions on Automatic Control, 33(9):812–819, 1988.
[6] S. Janardhanan and B. Bandyopadhyay.“New Approach for Design of Fast Output Sampling Feedback Controller.” (January):5– 7, 2003.
[7] S. Lekhchine, T. Bahi, I. Abadlia, Z. Layate, and H. Bouzeria. “Speed Control of Doubly Fed Induction Motor. Energy Procedia,” 74:575–586, 2015.
[8] Willis F Long and Norbert L Schmitz. Cycloconverter“Control of the Doubly Fed Induction.Ieee Transactions on Industry and General Application”, IGA-7,(1):95– 100, 1971.
[9] T.J.E. Miller “Theory of the doubly-fed induction machine in the steady state.”The XIX International Conference on Electrical Machines - ICEM 2010, pages 1–6, 2010.
[10] R S Pena, J C Clare, and G M Asher. “Vector Control of a Variable Speed DoublyFed Induction Machine for Wind Generation Systems Vector Control of a Variable Speed Doubly-Fed Induction Machine for Wind Generation Systems.” European Power Electronics and Drives, 6(3):60–67, 2015.
[11] Sergei Peresada and Andrea Tilli.“ Dynamic Output Feedback Linearizing Control of a Doubly-Fed Induction Motor.”In International Conference on Industrial Electronics, pages 1256–1260, 1999.
[12] Adel Shaltout. “ A Control Strategy for Integration of BESS with Wind Turbine DFIG Connected to Utility Grid.”HaythamGamal. International Journal of Process Systems Engineering, 2(3):273–290, 2014.
[13] J. Soltani and A. FarrokhPayam.“ A RobustAdaptive sliding-mode controller for slip power recovery induction machine drives.”Conference Proceedings - IPEMC 2006: CES/IEEE 5th International Power Electronics and Motion Control Conference, 3:1912–1917, 2007.
[14] Vladimir V Vdovin, Denis A Kotin, and Vladimir V Pankratov. “ State Observer for Sensorless Vector Control of Doubly Fed Induction Motor.” In XIV International Conference On Micro/Nanotechnologies And Electron Devices, pages 382–388, 2013.
[15] Herbert Werner.“Multimodel Robust Control by Fast Output Sampling.”Automatica, 34(12):1625–1630, 1998.
[16] H Werner and K Furuta. “ Simultaneous stabilization based on output measurement.”Kybernetika, 31(4):395–411, 1995.
[17] Li Yuan, He Feng-you, and Ye Zong-bin.“ Study on Sliding Mode Speed Control with RBF Network Approach for Doubly-Fed Induction Motor.” 2009 IEEE International Conference on Control and Automation, 2(2):339–342, 2009.