Sebti BELKACEM, Farid NACERI, Rachid ABDESSEMED

Reduction of torque ripple in DTC for induction motor using input-output feedback linearization

Direct torque control (DTC) is known to produce fast responses and robust control in AC adjustable-speed drives. However, in the steady-state operation, notable torque, flux, and current pulsations occur. In this paper, nonlinear DTC of induction motor drives is presented based on a space vector pulse-width modulation scheme combined with the input-output feedback linearization technique. The variation of stator and rotor resistance due to changes in temperature or frequency deteriorates the performance of the DTC controller by introducing errors in the estimated flux linkage and the electromagnetic torque. This approach will not be suitable for high power drives such as those used in tractions, as they require good torque control performance at a considerably lower frequency. Finally, extensive simulation results are presented to validate the proposed technique. The system is tested at different speeds and a very satisfactory performance is achieved.

Anahtar Kelimeler:

Direct torque control with space vector pulse-width modulation, key parameter variations, robustness, input-output feedback linearization

Reduction of torque ripple in DTC for induction motor using input-output feedback linearization

Keywords:

Direct torque control with space vector pulse-width modulation, key parameter variations, robustness, input-output feedback linearization,

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decreases by 50%, the variation in the stator resistance will not aﬀect the controller performance. In the case of DTC-IOFL, the new algorithm shows more robustness against stator resistance variation compared to classical DTC. 7.1.
Variation in the inertia coeﬃcient
Figure 8 shows the drive dynamic under diﬀerent values of inertia with a constant speed reference. It is clear that the speed tracking is signiŞcantly unchanged after J increases by 50% and decreases by 50% for DTC-IOFL compared to the classical controller.
Figure 8. Drive response under diﬀerent inertia values. 8. Conclusion
We presented a robust DTC method for a voltage inverter-fed IM based on a SVPWM scheme combined with the IOFL technique.
The overall torque and ﬂux control system was veriŞed to be robust to the variations of motor mechanical and electrical parameter variations. Simulation studies were used to demonstrate the characteristics of the proposed method.
It was shown that the proposed IOFL controller has better tracking performance and robustness against parameters variations as compared with the conventional DTC.
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