Performance analysis of direct torque control of induction machines

Yunus, Raja Nor Azrin Bin Raja; Jidin, Auzani; Alias, Nor Faezah; Herlino, Adeline Lukar; Manap, Mustafa

doi:10.1109/icems.2013.6713182

Cited by 4 publications

(2 citation statements)

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“…When flux error status is "0", it calls for decrease in flux. Suitable voltage vector should be selected [8]. …”

Section: Direct Flux Controlmentioning

confidence: 99%

Improvement of Torque Capability of Direct Torque Control of Induction Machines

Jidin¹,

Sim²,

Sutikno³

2017

IJPEDS

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A control strategy for overmodulation operation of direct torque control hysteresis based in induction machine is proposed. The strategy is to extend the constant torque region as well as to improve the torque capability. The proposed overmodulation strategy is different to SVM based system where the reference stator voltage is available. In order for DTC hysteresis based system to be able to achieve that, several modifications have been applied so that the proposed overmodulation can be achieved by gradually transforming the PWM voltage waveform to six-step mode. Simulated results were provided to demonstrate the effectiveness of the strategy. Keyword: Constant torque region Direct torque control Hysteresis based Induction machine Overmodulation Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved. Corresponding Author:Auzani Jidin, Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka (UTeM), Malacca, Malaysia. Email: auzani@utem.edu.my INTRODUCTIONThe availability of constant power is very important in applications such as in vehicle drive. In induction machine, various combinations of stator voltage, current and speed is used to estimate the flux and torque. The control of Direct Torque Control (DTC) of induction machines is based on selecting proper voltage vectors to maintain torque and stator flux within the hysteresis band [1]. In [2], voltage vector selection strategy that uses switching table is widely used because of the easy to understand concept a simple implementation. The drawback of a conventional DTC is that the switching frequency is unpredictable according to the machine parameters and speed condition. The system performance will degrade in a certain operating region such as at the low speed region.In [3], a common approach, space vector modulation (SVM) is used to exploit the overmodulation region in DTC. This strategy manages to obtain maximum torque output in field weakening region. This strategy requires voltage reference to define the mode of overmodulation in SVM. However, DTC hysteresis based is not capable to operate in overmodulation to complete six-step mode.This paper presents a strategy to extend the constant torque region and improve the torque capability of DTC hysteresis based without ruining the simplicity of basic DTC-hysteresis based structure. This proposed strategy introduces overmodulation strategy by gradually transforming the PWM voltage waveform to six-step mode. The method is different from SVM based system where the reference stator voltage is available and the overmodulation is achieved by modifying the reference voltage.

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“…When flux error status is "0", it calls for decrease in flux. Suitable voltage vector should be selected [8]. …”

Section: Direct Flux Controlmentioning

confidence: 99%

Improvement of Torque Capability of Direct Torque Control of Induction Machines

Jidin¹,

Sim²,

Sutikno³

2017

IJPEDS

Self Cite

View full text Add to dashboard Cite

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“…La técnica de control que inicialmente se empleó en el control de máquinas eléctricas fue el control escalar con una respuesta transitoria insatisfactoria [1], ante esto con el avance tecnológico se desarrolla el control vectorial que permite tener un control preciso del par electromagnético, este se divide en control de campo orientado FOC [2] y control directo al par DTC [3]. El control vectorial de campo orientado (FOC) y el control directo del par (DTC) son técnicas de control de velocidad aplicadas en los motores síncronos de imanes permanentes [4].…”

Section: Introductionunclassified

Control Directo al Par y Control de Campo Orientado para un Motor Síncrono de Imanes Permanentes

Cuji

Arcos-Avilés

2019

ing.

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Context: The permanent magnet synchronous motors (PMSM) have rapidly improved their performance in terms of power density, efficiency, and better dynamics, thanks to the technologies used in them, such as: the control technique and the drive circuit technology. A PMSM can operate both as a motor and as a generator. In addition, they stand out for having a low maintenance, since unlike other types of engines the PMSM does not have collector rings or brushes. The control algorithm that is generally used in this type of motor is a vector control, which is divided into Direct Torque Control (DTC) and Field Oriented Control (FOC). Method:The computational platform where the simulations are carried out is Matlab R software (R2017a) Simulink 8.9, where predetermined blocks and program functions are used for the DTC and FOC vector control diagrams.Results: Regarding the electromagnetic torque control, FOC presents higher ripple than the DTC, so that, it is concluded that the DTC has greater torque control in relation to the FOC. Regarding to the magnetic flux control, according to the obtained values, the DTC has better control performance than the FOC. For speed control, both the DTC and FOC control have a fast response to disturbances; however, the DTC has a fast control response when the PMSM starts moving from rest, which means that the DTC has a faster response in the transient state and when the engine is in motion FOC has better control performance to disturbance.Conclusions: When analyzing the most important aspects to determine which control technique is effective, it is concluded that the DTC control technique has greater effectiveness with respect to the FOC control technique. However, it is worth mentioning that the two control techniques are widely used in the industrial sector for driving electric motors, so that, the selection any of these techniques will depend on the process to be carried out.

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