A Novel Switching Table for a Modified Three-Level Inverter-Fed DTC Drive with Torque and Flux Ripple Minimization

Yashar Farajpour, Mohamad Alzayed, Hicham Chaoui and Sousso Kelouwani
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Yashar Farajpour: Intelligent Robotic and Energy Systems (IRES) Research Group, Department of Electronics, Carleton University, Ottawa, ON K1S 5B6, Canada
Mohamad Alzayed: Intelligent Robotic and Energy Systems (IRES) Research Group, Department of Electronics, Carleton University, Ottawa, ON K1S 5B6, Canada
Hicham Chaoui: Intelligent Robotic and Energy Systems (IRES) Research Group, Department of Electronics, Carleton University, Ottawa, ON K1S 5B6, Canada
Sousso Kelouwani: Hydrogen Research Institute and the Department of Mechanical Engineering, Université du Québec à Trois-Rivières, Trois-Rivières, QC G8Z 4M3, Canada

Energies, 2020, vol. 13, issue 18, 1-19

Abstract: The use of a direct torque control (DTC) drive is a well-known control strategy that is applied frequently to induction motors. Although torque and stator flux ripples are major disadvantages of this approach, using a higher-level inverter helps to overcome these issues. In this paper, we propose a novel switching table with a modified control strategy for a three-level inverter to achieve ripple minimization, as well as smooth switching and neutral point balance; the latter features are generally ignored in many works. The proposed model is compared with a conventional DTC and an improved three-level inverter-fed voltage vector synthesis model in the Matlab/Simulink ® environment with low, normal, and high-speed operation under load torque disturbances. The performance indexes and the comparative results confirm the effectiveness of the proposed model in reducing the torque and stator flux ripples by up to 70 % and 78 % , respectively, generating a lower total harmonic distortion (THD%) in all scenarios, in addition to maintaining the neutral point balance and preventing voltage jumps across the switches of the inverter.

Keywords: direct torque control; torque ripple; switching table; three-level inverter; neutral-point-clamped (NPC); total harmonic distortion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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