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Constant Switching Frequency DTC for Matrix Converter Fed Speed Sensorless Induction Motor Drive

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Abstract

The paper presents a constant switching frequency scheme for speed sensorless Direct Torque Control (DTC) of Matrix Converter fed Induction Motor Drive. The use of matrix converter facilitates improved power quality on input as well as motor side, along with Input Power Factor control, besides eliminating the need for heavy passive elements. Moreover, DTC through Space Vector Modulation helps in achieving a fast control over the torque and flux of the motor, with added benefit of constant switching frequency. A constant switching frequency aids in maintaining desired power quality of AC mains current even at low motor speeds, and simplifies input filter design of the matrix converter, as compared to conventional hysteresis based DTC. Further, stator voltage estimation from sensed input voltage, and subsequent stator (and rotor) flux estimation is done. For speed sensorless operation, a Model Reference Adaptive System is used, which emulates the speed dependent rotor flux equations of the induction motor. The error between conventionally estimated rotor flux (reference model) and the rotor flux estimated through the adaptive observer is processed through PI controller to generate the rotor speed estimate.

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Authors and Affiliations

  1. Department of Electrical Engineering, IIT Delhi, New Delhi, India

    Tabish Nazir Mir

  2. Department of Electrical Engineering, IIT Delhi, New Delhi, India

    Bhim Singh

  3. Department of Electrical Engineering, NIT Srinagar, Srinagar, India

    Abdul Hamid Bhat

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  1. Tabish Nazir Mir
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  2. Bhim Singh
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  3. Abdul Hamid Bhat
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Correspondence to Tabish Nazir Mir.

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Mir, T.N., Singh, B. & Bhat, A.H. Constant Switching Frequency DTC for Matrix Converter Fed Speed Sensorless Induction Motor Drive. J. Inst. Eng. India Ser. B 99, 527–535 (2018). https://doi.org/10.1007/s40031-018-0336-6

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  • DOI: https://doi.org/10.1007/s40031-018-0336-6

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