Global Minimum Torque Ripple Design for Direct Torque Control of Induction Motor Drives

Shyu, Kuo-Kai; Lin, Juu-Kuh; Pham, Van-Truong; Yang, Ming‐Jen; Wang, Te-Wei

doi:10.1109/tie.2009.2038401

Cited by 200 publications

(26 citation statements)

References 29 publications

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“…Hence, the selection is made by restricting the flux and torque magnitudes within two hysteresis bands. Those controllers ensure a separated regulation of both of these quantities [12][13][14]. The inputs of hysteresis controllers are the flux and the torque errors as well as their outputs determine the appropriate voltage vector for each commutation period.…”

Section: Principles Of Direct Torque Controlmentioning

confidence: 99%

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Direct Torque Control Strategies of Induction Machine: Comparative Studies

Cherifi¹,

Miloud²

2021

Direct Torque Control Strategies of Electrical Machines

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The direct torque control (DTC) was proposed as an alternative to the vector control in the middle of 1980s for AC machine control. This strategy bases on the direct determination of inverter switching states and offers a simpler scheme and less sensitivity to machine parameters. However, the variable switching frequency of DTC causes high flux and torque ripples which lead to an acoustical noise and degrade the performance of the control technique, especially at low-speed regions. In the objective of improving the performance of DTC for the induction motor, this work addresses the most important points concerning this issue. The reduction of high ripples, which are the major drawbacks, by applying a constant switching frequency using the space vector modulation (SVM) has been done firstly. Then, fuzzy DTC-SVM strategy with adaptive fuzzy-PI speed controller has been proposed. The results of all the discussed aspects of this chapter have been obtained by numerical simulation using MATLAB/Simulink software.

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Section: Principles Of Direct Torque Controlmentioning

confidence: 99%

“…δ angle between the stator and rotor flux vectors. From expression (14), it is clear that the electromagnetic torque is controlled by the stator and rotor flux amplitudes. If those quantities are maintaining constant, the torque can be controlled by adjusting the load angle δ.…”

Section: Control Of Electromagnetic Torquementioning

confidence: 99%

Direct Torque Control Strategies of Induction Machine: Comparative Studies

Cherifi¹,

Miloud²

2021

Direct Torque Control Strategies of Electrical Machines

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show abstract

“…A great deal of effort has been invested 2 of 14 in alleviating DTC high torque ripples, which mostly includes the modification of the hysteresis controller [11,12], amending the switching table (ST) [13,14], or replacing hysteresis controllers with other control strategies to provide Pulse Width Modulation (PWM)-based DTC [15]. A global minimum torque ripple using modified switching pattern has been proposed in [16]. In [17], the torque ripples have been reduced by applying active and zero voltage vectors in each sampling period using a predictive DTC.…”

Section: Introductionmentioning

confidence: 99%

A Novel Vector Control Strategy for a Six-Phase Induction Motor with Low Torque Ripples and Harmonic Currents

et al. 2019

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In this paper, a new vector control strategy is proposed to reduce torque ripples and harmonic currents represented in switching table-based direct torque control (ST-DTC) of a six-phase induction motor (6PIM). For this purpose, a new set of inputs is provided for the switching table (ST). These inputs are based on the decoupled current components in the synchronous reference frame. Indeed, using both field-oriented control (FOC) and direct torque control (DTC) concepts, precise inputs are applied to the ST in order to achieve better steady-state torque response. By applying the duty cycle control strategy, the loss subspace components are eliminated through a suitable selection of virtual voltage vectors. Each virtual voltage vector is based on a combination of a large and a medium vector to make the average volt-seconds in loss subspace near to zero. Therefore, the proposed strategy not only notably reduces the torque ripples, but also suppresses the low frequency current harmonics, simultaneously. Simulation and experimental results clarify the high performance of the proposed scheme.

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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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Global Minimum Torque Ripple Design for Direct Torque Control of Induction Motor Drives

Cited by 200 publications

References 29 publications

Direct Torque Control Strategies of Induction Machine: Comparative Studies

Direct Torque Control Strategies of Induction Machine: Comparative Studies

A Novel Vector Control Strategy for a Six-Phase Induction Motor with Low Torque Ripples and Harmonic Currents

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

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