Abstract
The present paper proposes an enhanced direct torque control (DTC) strategy for induction machine (IM) drive associated with a three-level neutral clamped (NPC) inverter. To ensure high-performance of the control scheme, accurate knowledge of flux, current, and speed values is crucial. However, some state variables, namely stator fluxes, are not accessible for measurement. To solve this problem, the high gain observer (HGO) has been integrated. This observer allows estimating the stator flux based on directly measured quantities (stator voltage and current) and also provides a robust control against machine parameter variation. The global control algorithm of the DTC with HGO has been designed and investigated via numerical simulations with Matlab/Simulink software.
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Appendix
Appendix
The IM parameters, used for simulating the control strategy behavior are given below: Motor speed = 150 rad/s, Pole pair numbers = 2, Resistance of the stator Rs = 5.72 Ω, Resistance of the rotor Rr = 4.28 Ω, Stator and rotor inductance Ls = Lr = 0.464 H, Mutual inductance Msr = 0.44 H, Viscous friction coefficient fc = 0.002, Moment of inertia J = 0.0049 kg.m2.
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Jnayah, S., Khedher, A. (2022). Improvement of DTC Performance of Three Level Inverter Fed IM Drive with High Gain Flux Observer. In: Motahhir, S., Bossoufi, B. (eds) Digital Technologies and Applications. ICDTA 2022. Lecture Notes in Networks and Systems, vol 454. Springer, Cham. https://doi.org/10.1007/978-3-031-01942-5_78
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DOI: https://doi.org/10.1007/978-3-031-01942-5_78
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