High-Performance Direct Torque Control of Induction Motor Drives: A Comparative Study of Hysteresis and Space Vector Modulation Schemes

Document Type : Research articles

Authors

1 International Academy for Engineering and Media Science

2 School of Aeronautics and Astronautics, Guilin University of Aerospace Technology, Guilin, 541004, China

Abstract

Direct Torque Control (DTC) is a prominent control strategy for induction motor drives, valued for its fast dynamic response and minimal dependence on motor parameters. This paper presents a comparative analysis of two DTC schemes: conventional hysteresis-based DTC and Space Vector Modulation (SVM)-based DTC, focusing on their performance in high-dynamic-response drive systems. The conventional hysteresis DTC, despite its simplicity and rapid torque response, suffers from high torque and flux ripples and variable switching frequency, which can degrade drive efficiency and precision. In contrast, SVM-DTC mitigates these drawbacks by maintaining a constant switching frequency, reducing torque ripple, and enhancing overall system efficiency, albeit at the cost of increased computational complexity. The study evaluates these schemes in terms of torque and flux control accuracy, switching losses, and dynamic response, providing a comprehensive assessment of their suitability for modern high-performance motor drive applications. MATLAB/Simulink is used to make modeling and simulation of the two schemes. From the obtained simulation results, both conventional and SVM-DTC have extremely fast torque dynamics. A key difference is the apparent smoothness of the torque, flux, and current waveforms of SVM-DTC compared to the conventional DTC. SVM-DTC provides a 30% reduction in torque ripples and a 20% increased improvement in overall system efficiency compared to conventional DTC. Additionally, SVM-DTC achieves a 2% faster dynamic response. However, SVM-DTC requires a more complex algorithm due to the SVM calculation itself, compared to the simpler hysteresis comparators and lookup table of conventional DTC.

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Engineering Research Journal (Shoubra)
Volume 54, Issue 2
April 2025
Pages 168-178

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