Torque Ripple Minimization of PMSM using Adaptive Feedback Linearization based Direct Torque Control
R. Suja P. Subha Karuvelam
The electronic computation of PMSM generates torque ripples and undesirable harmonics which negatively impacts the smooth speed operation and efficiency of PMSM. This paper proposes a combined Feedback Linearization based Direct Torque Control methodology for Impedance Source Inverter (ZSI) to mitigate torque ripples and undesirable harmonics of PMSM. The proposed controller mitigates torque ripples and undesirable harmonics by changing the desired switching pattern by generating reference voltages for three-phase ZSI in stationary reference frame using torque and flux as input. The advantage of combining proposed control scheme and ZSI is that it boosts the inversion operation and reduces the requirement of the DC-DC converter in boosting. Therefore, the conversion efficiency can be increased by 4-8 %. The performance of the proposed control scheme is studied by subjecting PMSM to full load torque and under load disturbances. The obtained results show the ability and effectiveness of the proposed control scheme in comparison with the conventional DTC method.
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