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Evaluation of LPF and PCLPF and Development of a Novel Method to Solve DC Offset Problem in Vector Control of Induction Motors

M. Ebrahimi and A. Ghaderi Department of Electrical Engingeering, Isfahan University of Technology

Abstract: Stator flux oriented vector control of induction motor (IM) drives for speed sensorless control has several advantages. But the application of a pure integrator for the flux estimation is difficult due to the presence of measurement noise and dc offset. To overcome these problems, some have used a programmable cascaded low pass filter (PCLPF). In this paper, it is shown that some problems still exist and some new problems arise from this approach. In order to solve these

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problems, a novel compensation method is proposed. In this scheme, the dc offset is detected and subtracted from the estimated flux along d and q axes. The simulation results show that it works well in the low speed region as well as in the transient state. The oscillation of the torque and the estimated flux are also reduced notably when the torque reference changes rapidly. Keywords: DC offset, Vector control, Induction motor, PCLPF, Stator flux oriented

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1. low-pass filter 2. programmable cascaded low-pass filter

b

1. Vas, P., Vector Control of ac Nachine, Oxford University Press, 1990.

.] CQI06J.”CQD6D /Q09 6Q3 DC 1AC“1

7 E& ;%f C`f R@E& C0@E& %5 pv.

3. Casadi, D., Serra, G., and Tani, A., “Sensitivity Investigation of a Speed Sensorless Induction Motor Drive Based on Stator Flux Vector Control,” PESC'97, Proceedings of the 28th Annual IEEE Power Electronics Specialists Conference, Vol. 2, pp. 1055 –1060, 1997.

4. Bose, B.K., and Goday Simoes, M., “Speed Sensorless Hybrid Vector Controlled Induction Motor Drive,” Proceedings of the Industry Applications Conference, thirtieth IAS Annual Meeting, Vol.1, pp.137-143, 1995.

5. Baghli, L., Razik, H., and Rezzoug, A., “A Stator Flux Oriented Drive for an Induction Motor with Extra (α , β) Coils,” IECON '98. Proceedings of the 24th Annual Conference of the IEEE ,Industrial Electronics Society, Vol. 4, pp. 2522-2526, 1998 .

6. Hurst, K.D., Habetler, T.G., Griva, G., and Profumo, F., “Zero-speed Tacholess IM Torque Control: Simply a Matter of Stator Voltage Induction,” IEEE Transaction on Industry application, Vol. 34, No. 4, 1995.

7. Hu, J., and Wu, B., “New Integration Algorithms for Estimating Motor Flux over a Wide Speed Range,” IEEE Transaction on Power Electronics, Vol. 13, No. 5, pp. 969-977, September 1998.

8. Bose, B.K., and Patel, N.R., “ A Programmable Cascaded Low-pass filter –Based Flux Synthesis for

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a Stator Flux-Oriented Vector-Controlled Induction Motor Drive,” IEEE Transaction on Industrial Electronics, Vol. 44. No. 1,pp.140-143,February 1997.

9. da Silva, L.E.B., Bose, B.K., and Pinto, J.O.P., “Recurrent-Network-Based Implementation of a Programmable Cascaded Low-pass Filter Used in Stator Flux Synthesis of Vector-controlled Induction Motor Drive,” IEEE Transaction on Industrial Electronics, Vol. 46, No. 3, pp. 662-665, June 1999.

10. Pinto, J.O.P, Bose, B.K., and Silva, L.E.B., “A Stator Flux Oriented Vector-Controlled Induction Motor Drive with Space Vector PWM and Flux Vector Synthesis by Neural Networks,” IEEE Transaction

on Industry Application, Vol. 37, No. 5, 2001. 11. Chun,T.W., and Choi, M.K., “A Novel Start-Up

Scheme of Stator Flux Oriented Vector Controlled Induction Motor Drive Without Torque Jerk,” Proceedings of the Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE Industry Applications Conference, Vol. 1, pp. 148-153, 2001.

12. Karanayil, B., “An Implementation of a Programmable Cascaded Low-Pass Filter for Rotor Flux Synthesizer for an Induction Motor Drive,” PESC 2002 IEEE 33rd Annual, Vol. 4, 2002.

13. SIMULINK, Dynamic System Simulation Software, User’s Guide, 2004.

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