Stochastic Pulse-Width Modulation and Modification of Direct Torque Control Based on a Three-Level Neutral-Point Clamped Inverter

Vasilev Bogdan Yurievich and Nguyen The Hien ()
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Vasilev Bogdan Yurievich: Department of Electricity and Electromechanics, Saint Petersburg Mining University, 199106 Saint Petersburg, Russia
Nguyen The Hien: Department of Electricity and Electromechanics, Saint Petersburg Mining University, 199106 Saint Petersburg, Russia

Energies, 2024, vol. 17, issue 23, 1-24

Abstract: The three-level neutral-point clamped inverter represents a significant advancement in direct torque-control systems for asynchronous motors. A significant achievement of this study lies in the comprehensive analysis of a random frequency-modulation algorithm, which demonstrates its efficacy in substantially reducing the amplitude of harmonic oscillations and minimizing switching losses. This simplifies filter design and minimizes thermal dissipation in power transistors, thereby enhancing the overall reliability and efficiency of the system. Additionally, the implementation of a six-position torque regulator with a fixed sensitivity zone, applied in direct torque control based on the three-level inverter, improves the stability of the stator flux linkage and reduces the switching frequency of transistors. Numerical simulations conducted in the Matlab/Simulink environment indicate that the proposed algorithm reduces switching losses by 15% during transient states and by 2% during steady-state operation while increasing the system’s efficiency by 2% compared to conventional methods. These findings highlight the potential of the proposed solutions for application in energy-efficient drive systems.

Keywords: stochastic pulse-width modulation; three-level neutral-point clamped inverter; direct torque control; harmonic current 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: 2024
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