Adaptive rotor resistance estimation in the low-speed range of speed sensorless DTC controlled IM drives

In this paper, an adaptive flux observer is designed for a speed sensorless direct torque controlled induction motor drive in which the rotor resistance value is updating during operation and a new speed-adaptive law is given. By using robust control theory, the constant observer gain is obtained by solving two bilinear matrix inequalities. The stability of the flux observer is ensured in a sufficiently large symmetric interval include zero point. Therefore, the sensorless drive system is capable of steadily working in low speed range and exhibits good dynamic and steady-state performance. The impact of the rotor resistance change on the low-speed performance of speed sensorless direct torque control system is at first verified by simulation and then by extensive experimentation. The result shows that the variation of the rotor resistance has great influence on the performance of speed sensorless direct torque control system, and the proposed rotor resistance estimator is capable of modifying the estimated speed effectively.

[1]  Atsuo Kawamura,et al.  Online rotor resistance estimation using the transient state under the speed sensorless control of induction motor , 2000 .

[2]  M. Schroedl,et al.  Sensorless control of AC machines at low speed and standstill based on the "INFORM" method , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[3]  M. S. Nait Said,et al.  Induction motors direct field oriented control with robust on-line tuning of rotor resistance , 1999 .

[4]  K. Matsuse,et al.  Speed sensorless field oriented control of induction motor with rotor resistance adaptation , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[5]  Tao Wang,et al.  Adaptive Stator Resistance Estimation Method for Speed Sensorless DTC Controlled IM Drives , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[6]  Y. Miloud,et al.  Fuzzy logic based rotor resistance estimator of an indirect vector controlled induction motor drive , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[7]  Atsuo Kawamura,et al.  Sensorless very low-speed and zero-speed estimations with online rotor resistance estimation of induction motor without signal injection , 2000 .

[8]  Sang-Hoon Lee,et al.  An online identification method for both stator-and rotor resistances of induction motors without rotational transducers , 2000, IEEE Trans. Ind. Electron..

[9]  Gui Wei-hua.  A Method of Speed Adaptive Estimation Based on Stator Flux U-N Model of IM , 2006 .

[10]  B. Karanayil,et al.  Stator and rotor resistance observers for induction motor drive using fuzzy logic and artificial neural networks , 2005 .

[11]  M. Pucci,et al.  A new adaptive integration methodology for estimating flux in induction machine drives , 2004, IEEE Transactions on Power Electronics.

[12]  P. Sicard,et al.  A simple on-line method for rotor resistance updating in indirect rotor flux orientation , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[13]  Hoang Le-Huy,et al.  Rotor resistance estimation using fuzzy logic for high performance induction motor drives , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[14]  P. Sicard,et al.  Implementation of a DSP based real-time estimator of induction motors rotor time constant , 2002 .

[15]  Yongdong Li,et al.  Identification of rotor resistance for induction motor with injection of torque disturbance , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[16]  Giuseppe Guidi,et al.  A novel stator resistance estimation method for speed-sensorless induction motor drives , 2000 .

[17]  Barry W. Williams,et al.  A novel rotor resistance identification method for an indirect rotor flux-orientated controlled induction machine system , 2002 .

[18]  H. Kubota,et al.  DSP-based speed adaptive flux observer of induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[19]  Kouki Matsuse,et al.  Regenerating-mode low-speed operation of sensorless induction motor drive with adaptive observer , 2002 .

[20]  Jin Young Choi,et al.  Flux observer with online tuning of stator and rotor resistances for induction motors , 2002, IEEE Trans. Ind. Electron..

[21]  Thomas G. Habetler,et al.  eed Measurement Usin ic Spectral Estimation i achine Driv , 1996 .

[22]  Thomas G. Habetler,et al.  Sensorless speed measurement using current harmonic spectral estimation in induction machine drives , 1994 .

[23]  Lazhar Ben-Brahim.  Motor speed identification via neural networks , 1995 .

[24]  Jan Melkebeek,et al.  Speed sensorless direct torque control of induction motors using an adaptive flux observer , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).