scholarly journals Reduction of torque ripple in DTC induction motor drive with discrete voltage vectors

2014 ◽  
Vol 11 (1) ◽  
pp. 159-173 ◽  
Author(s):  
Marko Rosic ◽  
Borislav Jeftenic ◽  
Milan Bebic
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Theoretical Background ◽  
Torque Control ◽  
Experimental Results ◽  
Motor Drive ◽  
Practical Implementation ◽  
Induction Motor Drive

This paper presents ? practical implementation of direct torque control (DTC) of an induction machine on MSK2812 DSP platform, and the analysis of possibilities for reduction of torque ripple. Basic theoretical background relating the DTC was primarily set and the obtained experimental results have been given. It is shown that the torque ripple can be reduced by adjusting the intensity of voltage vectors and by modification of hysteresis comparator, while the simplicity of the basic DTC algorithm has been maintained.

Novel torque ripple minimization algorithm for direct torque control of induction motor drive

2009 ◽  
Vol 13 (2) ◽  
pp. 155-163 ◽  
Author(s):  
Bo Long ◽  
Gui-fang Guo ◽  
Xiao-hong Hao ◽  
Xiao-ning Li
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Minimization Algorithm

scholarly journals Current Ripple Reduction of Predictive Torque-Controlled Induction Motor Drive Using Delta-Star Switchover

2021 ◽  
Vol 11 (6) ◽  
pp. 2863
Author(s):  
Ondrej Lipcak ◽  
Pavel Karlovsky ◽  
Pavel Kobrle ◽  
Jan Bauer
Keyword(s):  
Induction Motor ◽  
Harmonic Distortion ◽  
Torque Ripple ◽  
Theoretical Background ◽  
Torque Control ◽  
Total Harmonic Distortion ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Phase Voltage ◽  
The Difference

The current and torque ripple of inverter-fed induction motor drives is an inherent problem of control strategies working with switching frequencies in the range of multiple kilohertz, such as direct torque and, more recently, predictive torque control. If the drive operates in a wide-speed and wide-torque range and is equipped with a machine with an accessible terminal block whose winding is nominally connected in delta, then the current and torque ripple can be reduced by utilizing the delta-star winding changeover technique. When the winding configuration is switched from delta to star, the instantaneous motor phase voltage peak is lowered, and its total harmonic distortion is reduced. However, the control strategy must be adjusted according to the actual winding topology, mainly due to the difference in the coordinate transformations of the measured currents and the difference between the phase voltage vectors obtained from the inverter. This paper proposes a predictive torque control of an induction motor drive with a switchable delta-star winding configuration. The paper is supported by theoretical background, and the key idea is verified by simulations in MATLAB/Simulink and experiments conducted on a dSPACE-controlled 5.5-kW laboratory drive. The simulations validated the presented equations and show the effects of not respecting the actual winding topology. The experiments mainly focused on analyzing the total harmonic distortion of the currents and consumed electrical power in multiple operating points.

scholarly journals Direct Torque Control for Three-Level Neutral Point Clamped Inverter-Fed Induction Motor Drive

2012 ◽  
Vol 2 (2) ◽  
pp. 201-208 ◽  
Author(s):  
M. K. Sahu ◽  
A. K. Panda ◽  
B. P. Panigrahi
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Neutral Point ◽  
Torque Control ◽  
Control Technique ◽  
Motor Drive ◽  
Switching Frequency ◽  
Induction Motor Drive ◽  
Space Vector

Direct torque control (DTC) is a control technique in AC drive systems to obtain high performance torque control. The classical DTC drive contains a pair of hysteresis comparators and suffers from variable switching frequency and high torque ripple. These problems can be solved by using space vector depending on the reference torque and flux. In this paper the space vector modulation technique is applied to the three-level Neutral Point Clamped (NPC) inverter control in the proposed DTC-based induction motor drive system, resulting to a significant reduce of torque ripple. Three-level neutral point clamped inverters have been widely used in medium voltage applications. This type of inverters have several advantages over standard two-level VSI, such as greater number of levels in the output voltage waveforms, less harmonic distortion in voltage and current waveforms and lower switching frequencies. This paper emphasizes the derivation of switching states using the Space Vector Pulse Width Modulation (SVPWM) technique. The control scheme is implemented using Matlab/Simulink. Experimental results using dSPACE validate the steady-state and the dynamic performance of the proposed control strategy.

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