Application of an extended Kalman filter for high-performance current regulation of a vector-controlled induction machine drive

Abstract

Variable frequency AC drives using voltage-source inverters to supply induction motors are increasingly used in industry for high-performance speed response. Such a drive usually employs a vector-controller at the outer speed-loop which will generate the required torque-current signal. An inner current control loop is incorporated to ensure that an appropriate reference current is impressed on the stator circuit. However, due to nonlinearity and time varying characteristics of the machine circuit, a fixed-parameter regulator cannot give good current control performance in the transient state.

The paper presents a model-based predictive current regulator for a vector-con trolled induction motor drive. An extended Kalman filter is employed to estimate the back-EMF of the machine stator circuit model used by the inner current regulator loop. This also estimates the rotor resistance for slip angular velocity calculation in the outer speed-loop. The adaptive feature of this controller leads to improved speed-response performance from the induction machine.

Keywords

Kalman filter vector control induction motor

Get full access to this article

View all access options for this article.

References

Atkinson, D.J. , Acarnley, P. and Finch, J.W. 1991. 'Observers for induction motor state and parameter estimation' , IEEE Trans Ind Appl, 27(6), 1119-1127.

F. 1972. 'The principle of field orientation as applied to the new transvector closed loop control system for rotating machines', Siemens Review, 39, 217-220.

Brod, D.M. , and Novotny, D.W. 1985. 'Current control of VSI-PWM inverters', IEEE Trans on Ind Appl, 21(4), 562-570.

Brown, R.G. , and Hwang, P.Y.C. 1992. Introduction to Random Signals and Applied Kalman Filtering (2nd Edn), John Wiley & Son Inc, USA.

Chui, C.K. , and Chen, G. 1987. Kalman Filtering with Real-Time Applications, Springer-Verlag Book Company, Germany.

Hardan, F. , and Zhang, L. 1994. 'Optimal predictive space-vector modulation control of stator current for high performance induction motor drives', IEE Control '94, Conference Publication No 389, 21-24 March, 1204-1209.

Holtz, J. 1992. 'Pulsewidth Modulation-A survey', IEE-F Trans on Ind Elect, 39(5), Dec, 410-420.

Meisel, J. 1969. Principles of Electromechanical-Energy Conversion , McGraw-Hill Book Company, USA.

Norman, R.A. , and Zhang, L. 1993. 'The application of generalized predictive control to CRPWM inverters for induction motor drives', 28th UPEC, Stafford-shire, UK, Sept, 638-641.

10.

Rowan, T.M. , and Kerkman, R.J. 1986. 'A new synchronous current regulator and analysis of current regulated PWM inverters', IEEE Trans Ind Appl, 22(4), 678-690.

11.

van der Broeck, H.W. , Skudehay, H.- Ch. , and Stanke, G. 1988. 'Analysis and realization of a pulsewidth modulator based on voltage space vectors', IEEE Trans Ind Appl, 24(1), Jan/Feb.

12.

Zai, L.C. , and Lipo, T.A. 1987. 'An extended Kalman filter approach to rotor-time constant measurement in PWM induction motor drives', IEEE Ind Appl Society (IAS) Ann Meeting, 177-183.

13.

Zhang, L. , and Hardan, F. 1994. 'Vector controlled VSIfed AC drive using a predictive space-vector current regulation scheme', IEEE IECON '94, Bologna, Italy, 5-9 Sept, 61-66.

14.

Zhang, L. , Norman, R.A. , and Shepherd, W. 1996. 'Long-range predictive control of current regulated PWM for induction motor drives using the synchronous reference frame', IEEE Trans on Control Systems Technology, Nov.