MRAS Based Sensorless Control of a Series-Connected Five-Phase Two-Motor Drive System

- Journal title : Journal of Electrical Engineering and Technology
- Volume 3, Issue 2, 2008, pp.224-234
- Publisher : The Korean Institute of Electrical Engineers
- DOI : 10.5370/JEET.2008.3.2.224

Title & Authors

MRAS Based Sensorless Control of a Series-Connected Five-Phase Two-Motor Drive System

Khan, M. Rizwan; Iqbal, Atif;

Khan, M. Rizwan; Iqbal, Atif;

Abstract

Multi-phase machines can be used in variable speed drives. Their applications include electric ship propulsion, 'more-electric aircraft' and traction applications, electric vehicles, and hybrid electric vehicles. Multi-phase machines enable independent control of a few numbers of machines that are connected in series in a particular manner with their supply being fed from a single voltage source inverter(VSI). The idea was first implemented for a five-phase series-connected two-motor drive system, but is now applicable to any number of phases more than or equal to five-phase. The number of series-connected machines is a function of the phase number of VSI. Theoretical and simulation studies have already been reported for number of multi-phase multi-motor drive configurations of series-connection type. Variable speed induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. To replace the sensor, information concerning the rotor speed is extracted from measured stator currents and voltages at motor terminals. Open-loop estimators or closed-loop observers are used for this purpose. They differ with respect to accuracy, robustness, and sensitivity against model parameter variations. This paper analyses operation of an MRAS estimator based sensorless control of a vector controlled series-connected two-motor five-phase drive system with current control in the stationary reference frame. Results, obtained with fixed-voltage, fixed-frequency supply, and hysteresis current control are presented for various operating conditions on the basis of simulation results. The purpose of this paper is to report the first ever simulation results on a sensorless control of a five-phase two-motor series-connected drive system. The operating principle is given followed by a description of the sensorless technique.

Keywords

Five-phase Machine;MRAS-estimator;Multi-phase Multi-motor Drives;Vector Control;

Language

English

Cited by

References

1.

S. Williamson and S. Smith, "Pulsating torques and losses in multiphase induction machines," IEEE Trans. on Industry Applications, vol. 39, no. 4, pp. 986-993, 2003

2.

S. Green, D. J. Atkinson, A. G. Jack, B. C. Mecrow, and A. King, "Sensorless operation of a fault tolerant PM drive," IEE Proc. - Electr. Power Appl., vol. 150, no. 2, 2003, pp. 117-125

3.

J. B. Wang, K. Atallah, and D. Howe, "Optimal torque control of fault-tolerant permanent magnet brushless machines," IEEE Trans. on Magnetics, vol. 39, no. 5, pp. 2962-2964, 2003

4.

S. Gataric, "A polyphase Cartesian vector approach to control of polyphase AC machines," Proc. IEEE Ind. Appl. Soc. Annual Meeting IAS, no. 38-02, 2000

5.

E. Levi, M. Jones, and S. N. Vukosavic, "Even-phase multi-motor vector controlled drive with single inverter supply and series connection of stator windings," IEE Proc. - Electric Power Applications, vol. 150, no. 5, 2003, pp. 580-590

6.

E. Levi, M. Jones, S. N. Vukosavic, and H. A. Toliyat, "A novel concept of a multi-phase, multi-motor vector controlled drive system supplied from a single voltage source inverter," IEEE Trans. on Power Electronics, vol. 19, pp. 320-335, 2004

7.

E. Levi, M. Jones, S. N. Vukosavic, and H. A. Toliyat, "Operating principles of a novel multi-phase multimotor vector controlled drive," IEEE Trans. on Energy Conversion, vol. 19, no. 3, pp. 508-517, 2004

8.

K. K. Mohapatra, M. R. Baiju, and K. Gopakumar, "Independent speed control of two six-phase induction motors using a single six-phase inverter," EPE Journal, vol. 14, no. 3, pp. 49-62, 2004

9.

E. Levi, S. N. Vukosavic, and M. Jones, "Vector control schemes for series-connected six-phase twomotor drive systems," IEE Proc. - Electric Power Applications, vol. 152, no. 2, 2005, pp. 226-238

10.

E. Levi, M. Jones, S. N. Vukosavic, and H .A. Toliyat, "A five-phase two-machine vector controlled induction motor drive supplied from a single inverter," EPE Journal, vol. 14, no. 3, pp. 38-48, 2004

11.

E. Levi, M. Jones, S. N. Vukosavic, A. Iqbal, and H. A. Toliyat, "Modeling, control, and experimental investigation of a five-phase series-connected twomotor drive with single inverter supply," IEEE Trans. On Industrial Electronics, vol. 54, no. 3, pp. 1504-1516, Jun. 2007

12.

E. Levi, M. Jones, A. Iqbal, and H. A. Toliyat, "An induction machine/Syn-Rel two-motor five-phase series-connected drive," IEEE Trans. On Energy Conversion, vol. 22, no. 2, pp. 281-289, Jun. 2007

13.

E. Levi, A. Iqbal, S. N. Vukosavic, and H. A. Toliyat, "Modeling and control of a five-phase seriesconnected two-motor drive," IEEE Ind. Elec. Soc. Annual Meeting IECON, 2003, pp. 208-213

14.

M. Jones, E. Levi, and A. Iqbal, "Vector control of a five-phase series-connected two-motor drive using synchronous current controllers," Electric Power Comp. & Systems, vol. 33, no. 4, 2005, pp. 411-430

15.

M. Jones, S. N. Vukosavic, E. Levi, and A. Iqbal, "A novel six-phase series-connected two-motor drive with decoupled dynamic control," IEEE Industry Applications Society Annual Meeting IAS, 2004, pp. 639-646

16.

P. Vas, "Sensorless Vector and Direct Torque Control," Oxford University Press, 1998

17.

K. Rajashekara, A. Kawamura, and K. Matsuse, "Sensorless control of AC motors," Eds. Piscataway," NJ: IEEE Press, 1996

18.

S. Green, A. G. Atkinson, B. C. Mecrow, and A. King, "Sensorless Operation of a Fault Tolerant PM Drives," IEE Proc. Elect. Power application, vol. 150, No. 2, pp. 117-125

19.

J. Holtz, "Sensorless control of induction machines -with or without signal injection?," IEEE Transactions on Industrial Electronics, vol. 53, no. 1, Feb. 2006

20.

M. R. Khan, A. Iqbal, and M. Ahmad, "Artificial intelligence -based sensorless control of a vector controlled five-phase induction motor drive," IEEE International Conf. on Recent Advancement and Applications of Computer in Electrical Engineering (RACE)

21.

M. R. Khan, A. Iqbal, and M. Ahmad, "RNN-based sensorless control of a vector controlled five-phase induction motor drive," i-manager's Journal on Electrical Engineering, vol. 1, no.1, pp 16-24, Sept. 2007