Torque-Ripple Reduction and Fast Torque Response Strategy for Predictive Torque Control of Induction Motors

Cho, Yong-Soo; Bak, Yeongsu; Lee, Kyo‐Beum

doi:10.1109/tpel.2017.2699187

Cited by 65 publications

(31 citation statements)

References 20 publications

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“…Model predictive control (MPC) is considered as the second alternative control strategy that requires a predefined cost function to predict output states to obtain state variables and execute control object optimization [14][15][16][17][18][19][20][21]. Another approach to improving DTC is by controlling the duty-ratio of applied voltage vectors (DDTC) [22,23]. In DDTC, the duty-ratio of applied voltage vectors are adjusted to reduce the ripples of torque and flux.…”

Section: Introductionmentioning

confidence: 99%

Low-Speed Performance Improvement of Direct Torque Control for Induction Motor Drives Fed by Three-Level NPC Inverter

2020

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Classical direct torque control (DTC) is considered one of the simplest and fastest control algorithms in motor drives. However, it produces high torque and flux ripples due to the implementation of the three-level hysteresis torque regulator (HTR). Although, increasing the level of HTR and utilizing multilevel inverters has a great contribution in torque and flux ripples reduction, stator flux magnitude of induction motor (IM) droops at every switching sector transition, particularly at low-speed operation. This problem occurs due to the utilization of a zero voltage vector, where the domination of stator resistance is very high. A simple flux regulation strategy (SFRS) is applied for low-speed operation for DTC of IM. The proposed DTC-SFRS modifies the output status of the five-level HTR depending on the flux error, torque error, and stator flux position. This method regulates the stator flux for both forward and reverse rotational directions of IM with retaining the basic structure of classical DTC. By using the proposed algorithm, the stator flux is regulated, hence pure sinusoidal current waveform is achieved, which results in lower total harmonics distortion (THD). The effectiveness of the proposed DTC-SFRS is verified through simulation and experimental results.

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Section: Introductionmentioning

confidence: 99%

Low-Speed Performance Improvement of Direct Torque Control for Induction Motor Drives Fed by Three-Level NPC Inverter

2020

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“…It is known that the error voltage vector is determined mainly by the switching frequency and pulse-width modulation (PWM) technique. However, because the switching frequency cannot be increased beyond a certain range owing to practical limitations, various PWM techniques based on the conventional SVPWM (CSVPWM) have been reported that reduce the error voltage vector, in terms of root mean square (RMS) torque ripple [6][7][8][9][10] and RMS current ripple [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Remote-State PWM with Minimum RMS Torque Ripple and Reduced Common-Mode Voltage for Three-Phase VSI-Fed BLAC Motor Drives

et al. 2020

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A minimum root mean square (RMS) torque ripple-remote-state pulse-width modulation (MTR-RSPWM) technique is proposed for minimizing the RMS torque ripple under reduced common-mode voltage (CMV) condition of three-phase voltage source inverters (VSI)-fed brushless alternating current (BLAC) motor drives. The q-axis current ripple due to an error voltage vector generated between the reference voltage vector and applied voltage vector is analyzed for all pulse patterns with reduced CMV of the RSPWM. From the analysis result, in the MTR-RSPWM, a sector is divided into five zones, and within each zone, pulse patterns with the lowest RMS torque ripple and reduced CMV are employed. To verify the validity of the MTR-RSPWM, theorical analysis, simulation, and experiments are performed, where the MTR-RSPWM is thoroughly compared with RSPWM3 that generates the minimum RMS current ripple. From the analytical, simulation, and experimental results, it is shown that the MTR-RSPWM significantly reduces the RMS torque ripple under a reduced CMV condition at the expense of an increase in the RMS current ripple, compared to the RSPWM3.

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“…Although this scheme has the merits of obtaining a constant-switching frequency and fewer torque ripples, the torque dynamics and simplicity of the classical DTC are lost. The second popular control method is model predictive control (MPC), which is generally classified into conventional MPC and finite-set predictive torque control (FS-PTC) [7][8][9][10][11][12][13][14][15][16][17]. The choice of voltage vectors for FS-PTC is attained through a predefined cost function instead of using a look-up table.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Direct Torque Control with a Constant-Frequency Torque Regulator under Various Discrete Interleaving Carriers

Alsofyani

Lee

2019

Electronics

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Constant-frequency torque regulator-based direct torque control (CFTR-DTC) provides an attractive and powerful control strategy for induction and permanent-magnet motors. However, this scheme has two major issues: A sector-flux droop at low speed and poor torque dynamic performance. To improve the performance of this control method, interleaving triangular carriers are used to replace the single carrier in the CFTR controller to increase the duty voltage cycles and reduce the flux droop. However, this method causes an increase in the motor torque ripple. Hence, in this work, different discrete steps when generating the interleaving carriers in CFTR-DTC of an induction machine are compared. The comparison involves the investigation of the torque dynamic performance and torque and stator flux ripples. The effectiveness of the proposed CFTR-DTC with various discrete interleaving-carriers is validated through simulation and experimental results.Electronics 2019, 8, 820 2 of 15 and constraints. Generally, PTC strategies, although helping to address the problem, are associated with some issues such as the increase in total harmonic distortion and a high computational burden [11].Lately, interest has increased in using DTC with a constant-frequency torque regulator (CFTR-DTC) in AC motor drives [18][19][20][21][22][23]. The DTC-CFTR was initially created for achieving a constant switching frequency of inverters and a reduction of torque and flux ripples [18]. Unlike the DTC-SVM and MPC methods, there is a possibility to solve the stated DTC problems by applying CFTR in the basic configuration of classical DTC while maintaining the simple DTC algorithm. To date, only a handful of studies have been reported to address these problems in the CFTR. Some studies of DTC-CFTR have applied it in multilevel-based DTC (ML-DTC), such as three-level [19] and five-level [20] systems. They can provide a higher degree of freedom in control to obtain smoother torque and flux responses and to lead to a torque ripple reduction. In previous work [21], an over modulation method was proposed to enhance CFTR-DTC by retaining a single active-voltage vector during the torque transient. In other work [22], the digital signal processor (DSP) board was extended using a field programmable gate array controller to generate a higher carrier frequency, thus achieving a further reduction of the torque ripple. Nevertheless, this work requires extending extra software and an external controller to the drive system. In other research [23], CFTR-DTC has been investigated for low-speed operation showing satisfactory performance in terms of flux regulation improvement. Nevertheless, it still suffers from sector-flux droop and poor torque dynamic performance. In [24], CFTR-DTC with interleaving carriers was reported to improve the CFTR at the low-speed range. The configuration of the controller is like the conventional CFTR; yet, the method needs two carrier waveforms with a 90 • phase shift for the upper and lower sides. However, the CFTR rules in [24] were ...

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Torque-Ripple Reduction and Fast Torque Response Strategy for Predictive Torque Control of Induction Motors

Cited by 65 publications

References 20 publications

Low-Speed Performance Improvement of Direct Torque Control for Induction Motor Drives Fed by Three-Level NPC Inverter

Low-Speed Performance Improvement of Direct Torque Control for Induction Motor Drives Fed by Three-Level NPC Inverter

Remote-State PWM with Minimum RMS Torque Ripple and Reduced Common-Mode Voltage for Three-Phase VSI-Fed BLAC Motor Drives

Evaluation of Direct Torque Control with a Constant-Frequency Torque Regulator under Various Discrete Interleaving Carriers

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