This paper presents a direct torque controlled dtc induction motor im drive that utilizes feedback linearization and slidingmode control smc. This paper presents a unique direct torque control dtc approach for induction motor im drives fed by using a fuzzy logic controller. Induction motor drive, modeling of induction motor, vector control, field orient control, direct torque control, and fuzzy applications. In addition, the work describes a model of doubly star induction motor in reference frame theory. Fuzzy pi controller is used for controlling the rotor speed and ann applied in switching select stator voltage. Keywords direct torque control, fuzzy logic control, space vector modulation, induction motor control. Direct torque control of induction motor with fuzzy. Lakshmi devi3 1pg student, eee department, sri venkateswara university of college of engineering, andhra pradesh, india. Direct torque control for induction motor using fuzzy. Another feedback linearization approach is proposed which is fuzzy logic controller flc, which. In the direct torque control if the sample time is short enough, such that the stator voltage space vector is imposed to the motor keeping the stator flux constant at the reference value, the rotor flux can be considered constant because it changes. The present paper describes the direct torque sensor less speed control of induction motor fed by threelevel voltage source inverter. S department of ece, skce, coimbatore, india department of ece, skce, coimbatore, india abstract direct torque control dtc of an induction motor fed by a voltage source inverter is a.
Direct torque control strategy based on fuzzy logic. This paper describes direct torque control dtc scheme of induction motor im and its comparative study using intelligent techniques under varying dynamic conditions are discussed. Pdf direct torque control of induction motor using fuzzy. Principal of fuzzy direct torque control the principal of direct torque control using fuzzy logic fdtc. Selftuning pitype fuzzy direct torque control for three. Direct torque control of a three phase induction motor. These fuzzy rules are applied to the fuzzified input values and fuzzy outputs are calculated.
Performance enhancement of fuzzy logic duty ratio controller. Direct torque control of three phase induction motor using. Improvement in direct torque control of induction motor. Vf control method can control the speed in wide range with full. To illustrate the performances of the dtc of the dsim we replaced the classical pid controller by a fuzzy pso technique in fig. The proposed dtc is based on fuzzy logic technique.
Direct torque control of induction motor drive using pi fuzzy logic controller venkatesh. Pi controller is more suitable in steady state condition and for linear system. Direct torque control dtc system is currently one of the favourable control schemes for ac motor drives since it has the important advantage that system. However, this control technique requires complex coordinate transformation, inner current control. Direct torque control for induction motor using fuzzy logic. Introduction the history of electrical motors goes back as far as 1820, when hans christian oersted discovered the magnetic effect of. At present, induction motors are the dominant drives in various industries. Direct torque control of three phase induction motor drive using fuzzy logic controllers for low torque ripple a.
A fuzzy direct torque control of induction motor for fpga implementation yosr bchir, soufien gdaim, and abdellatif mtibaa laboratory of electronics and micoelectronics of the fsm national engineering school of monastir, avenue ibn eljazzar, 5019 monastir, university of monastir, tunisia. A fuzzy direct torque control of induction motor for fpga. Pdf direct torque control of induction motor drive by. By using these two approaches of dtc, the advantages of fuzzy logic control, space vector modulation, and direct torque control method are combined. This control method is based on dtc operating principles.
Improvements in direct torque control of induction motor for. Direct torque control of induction motors with fuzzy logic controller abstract. This paper presents artificial neural networks ann and adaptive neural fuzzy inference system anfis for reduction of torque and flux ripples in transient and steady state response of direct torque control dtc for induction motor drive. Dtc of induction motor with fuzzy logic controller is compared with pi controller. Direct torque control of induction motor using fuzzy logic controller. Performance of three phase induction motor of direct torque. Direct torque control of three phase induction motor using fuzzy logic proceedings of 40th ththe iier international conference, manila, philippines, 9 october. Pdf direct torque control of induction motor fed by. Simulations a re carried out for dynamic changes in induction motor torque.
A matlab simulation is developed to study the performance of the conventional dtc and dtc with fuzzy logic controller for 4 poles induction motor torque control. Direct torque control, fuzzy logic controller, induction motor, artificial neural net work. Artificial neural network and adaptive neuro fuzzy control. Direct torque control, space vector modulation, fuzzy logic controller, asynchronous motor. Pdf direct torque control of induction machine using. Indirect vector control of induction motor using fuzzy logic. Direct torque control dtc is known to generate fast and robust control for induction motor drives. In the direct torque control if the sample time is short enough, such that the stator voltage space vector is imposed to the motor keeping the stator flux constant at the reference value, the rotor flux can be considered constant because it changes slower than the stator flux. Isncesr16 direct torque control of induction motor drive. This study presents a fuzzy logic based svmdtc strategy to improve performance of an induction motor.
Direct torque control of induction motor using slidingmode and fuzzy logic methods abstract. Dtc is employed for high performance and quick response drives 2. This paper presents an improved direct torque control dtc based on fuzzy logic technique. Vsi, and the inverter switching mode selection the fuzzy controller output signals sa, sb, sc in fig.
Fuzzy logic based sensorless direct torque control of. Direct torque control dtc is the simplest method meant for torque control of a threephase induction motor. This paper presents the simulation of the control of doubly star induction motor using direct torque control dtc based on proportional and integral controller pi and fuzzy logic controller flc. Toufouti and others published direct torque control for induction motor using fuzzy logic find, read and cite all the research you need on researchgate. Tulasi ram das2 1school of electrical engineering, vignan university, vadlamudi, a. In this project we propose an approach to improve the direct torque control dtc of an induction motor im. Rachid nat sad this paper presents an improved direct torque control based on fuzzy logic technique. Performance of three phase induction motor of direct. It has been observed that the torque and the stator flux ripples are significantly reduced and a constant switching frequency is achieved in fuzzy controller. This intelligent technique was used to replace, on the one hand the hysteresis comparators in order to reduce thd total harmonic distortion of stator current, torque ripple and stator flux ripple, on other hand and the classic integral proportional.
Direct torque control of dual star induction motor using a. Direct torque control of three phase induction motor drive. In this paper, the author proposes a sensorless direct torque control dtc of an induction motor im fed by sevenlevel npc inverter using artificial neural networks ann and fuzzy logic controller. By using this control strategy, advantages of svm and fuzzy logic control are combined. This paper presents an improved direct torque control in induction motor that based on fuzzy logic technique. Direct torque control of induction motor with fuzzy minimization torque ripple fatiha zidani. This paper suggests a new approach, fuzzy logic based space vector modulation, on the direct torque controlled induction motors and aim of the approach is to. The flux and electromagnetic torque can be controlled by using efficient direct torque control dtc scheme this proposed technique is to improve the. The proposed control scheme uses the stator flux amplitude and the electromagnetic torque errors through an adaptive neuro fuzzy inference system anfis to act on both the amplitude and the angle of the desired reference voltage. In this paper, we are interested in the study and improvement of the performances of a doubly fed induction machine dfim functioning in motor mode using the strategy of direct control torque dtc based on fuzzy logic. Torque ripple reduction in direct torque control of induction motor using fuzzy logic based duty ratio controller. Therefore, two fuzzy direct torque control approaches, for the induction motor fed by svmvoltage source inverter, are proposed in this paper.
In this article a direct torque of the induction motor drive controlled by neuro fuzzy system is proposed. The fuzzy controller is designed to have three fuzzy state variables and one control variable for achieving direct torque control of the induction machine89, there are three variable input fuzzy logic controllers, the. Direct torque control, space vector modulation, fuzzy logic controller, induction motor, torque ripple minimization. Direct torque control of induction motors with fuzzy logic. This paper presents an improved direct torque control dtc strategy for a doubly fed induction machine dfim powered by two voltage source inverters vsi at two levels. The simulation is carried out under the following conditions. The scheme, as the name indicates, is the direct control of torque and stator flux of a drive by inverter voltage space vector selection through a look up table. This paper presents a direct flux and torque control dtc of induction motor drive imd for speed regulator sr using fuzzy logic controller flc. Direct torque control of induction motor using fuzzy logic. The fuzzy controller is designed to have three fuzzy state variables and one control variable for achieving direct torque control of the induction machine, there are three variable input fuzzy logic controllers, the stator flux error.
The variable torque command is generated from the speed loop using a conventional pi controller which has been implemented in experimental work to validate the simulation results. Pdf direct torque control for induction motor using. Improvements in direct torque control of induction motor for wide. Improved dtc strategy of doubly fed induction motor using. Introduction the history of electrical motors goes back as far as 1820, when hans christian oersted discovered the magnetic effect of an electric current. Even though, in classical dtc, there exists a notable ripple in torque and flux during steady state, which can be reflected towards the speed response. Improvement in direct torque control of induction motor using. Direct torque control dtc of an induction motor fed by a voltage source inverter is a modest scheme that does not need lengthy computation time and can be. Introduction the induction motor im drives controlled with the vector control method has found wide acceptance in the industry. The parameters of the dsim are presented in table 6 appendix. Direct torque control of induction machine using fuzzy logic technique 5 comparator, one can easily control and maintain the end of the vector flux, in a circular ring. Pdf in this paper we propose an approach to improve the direct torque control dtc of an induction motor im.
Introduction squirrel cage induction motor s are used in almost 75% of industrial applications, the popularity of the induction machine is. Dtc based fuzzy logic the principal of direct torque control using fuzzy logic fdtc. Direct torque control direct torque control dtc technique controls the speed of the induction motor by varying its torque and flux. These are because the dtc technique eliminates the pulse width modulation pwm and the rotor parameters dependence as compared with the widely used cvc techniques. In this paper we propose an approach to improve the direct torque control dtc of an induction motor im. Performances assessment of direct torque controlled im. This paper suggests a new approach, fuzzy logic based space vector modulation, on the direct torque controlled induction motors and aim of the approach is to overcome high torque ripple.
Direct torque control of an induction motor using fuzzy logic ieee. Improvements in direct torque control of induction motor. Sevenlevel direct torque control of induction motor based on. The dtc is one of the most excellent strategies of torque and flux ripples control of imd. Fuzzy logic direct torque control for asynchronous motor.
Torque ripple reduction in direct torque control based. Fuzzy logic controller for three phase induction motor has been developed and analysed using matlab simulation. This paper presents a method for improving the speed control of 3phase induction motors im using hybrid direct torque controller dtc fuzzy logic controller flc techniques. Keywords vector control, induction motor, fuzzy logic controller, speed control and space vector pwm. Compared to conventional direct torque control dtc, hysteresis controllers, flux position. The motor is powered from the voltage source inverter. But since dtc along with im is mostly nonlinear, fuzzy controller. Introduction the induction motor is the most widely used rotating machine in industries with very wide power ranges from fractional hp to a few megawatts.
Introduction in many industrial applications, direct torque control dtc of induction motor is wellknown. The major problem that is usually associated with dtc drive is the high torque ripple. Pdf fuzzy logic based direct torque control of induction. This paper presents intelligent control scheme together with conventional control scheme to overcome the problems with uncertainties in the structure encountered with classical model based design of induction motor drive based on direct torque control dtc. Inverter switches control is based on fuzzy logic control. At first, we are focusing in the study of the functioning principle and the modeling of the dfim. Direct torque control of induction motor fed by threelevel. Pdf torque ripple reduction in direct torque control of. Direct torque control of induction motor fed by three. Direct torque control of induction motors based on space vector modulation with adaptive stator flux observer using fuzzy logic controller rallapalli sneha1, j.
Comparison analysis of dtc fed induction motor drive with. Studies on direct torque controlbased speed control of three. Compared to conventional direct torque control dtc, hysteresis controllers, flux position and. Direct torque control of induction motor drive using pifuzzy logic controller venkatesh. The flux and torque errors act as input to fuzzy logic controllers which produce optimum space vector as output in order to reduce errors. In conventional dtc pi controller is used in the speed controller. Performance enhancement of fuzzy logic duty ratio controller based direct torque control of induction motor 43. Oct 09, 2014 in this project we propose an approach to improve the direct torque control dtc of an induction motor im. It is quite cumbersome to control an induction motor im because of its poor dynamic response in comparison to the dc motor drives. Introduction over the years direct torque control dtc of induction motor emerged as an alternative to field oriented control of induction motor 1. The threephase induction motors im are used in a wide variety of industrial applications due to its simple construction, reliability, robustness and low cost.
Direct torque control becomes attractive for applications that desire fast torque response and strong robustness with the motor parameter variation 5,6. This paper presents the application of fuzzy logic technique to reduce torque ripples in an induction motor drive employing direct torque control dtc. Induction motor, torque control, fuzzy logic,reducing torque ripple factor. This method is designed by means of fuzzy logic with three inputs. It is based on the appropriate selection of voltage. This paper presents an improved fivelevel direct torque control dtc with 36 sectors of induction motor im based on fuzzy logic. The results were obtained using a pso algorithm programmed and implemented in matlab. The three phase induction motor drive model using direct torque control method is simulated by using the matlabsimulation. Comparison analysis of dtc fed induction motor drive with or.
This involves calculating an estimate of the motor s magnetic flux and torque based on the measured voltage and current of the motor. In this paper three phase induction motor model is used with dtc and fuzzy logic controller to control the speed and uctuations in the torque of induction motor. Introduction induction motors are electromechanical devices used in most of the industr ial applications for the conversion of power from electrical to mechanical form. The proposed dtc is based on fuzzy logic technique switching table, is described. The simulation results show that dtc svm scheme with fuzzy logic controller give s less torque and flux ripples, better transient. In this paper we describe the control of an induction machine im using the principle of direct torque and flux control dtfc. Pdf direct torque control of induction motor fed by three. In this paper the cdtc is improved by fuzzy logic switching controller and fuzzy logic duty cycle controller. Performance enhancement of direct torquecontrolled. Direct torque control dtc method uses hexagonal path only when rated voltage is required at high speed. The direct torque control of induction motor with fuzzy logic controller is investigated in this paper. Direct torque control dtc is one method used in variable frequency drives to control the torque and thus finally the speed of threephase ac electric motors.
Direct torque control of induction motor drive using pi. The major drawbacks of conventional direct torque control are high torque, flux ripples and poor dynamic response at low speed. Direct torque control of induction motor with fuzzy logic for. Direct torque control of induction motors based on space. Direct torque control of induction drive using fuzzy controller.
This strategy is based on the fuzzy logic controller. A complete simulation of the conventional dtc and closedloop for speed control of a 3phase im was tested using simulink. This type of control is essentially a sliding mode stator. In this paper all three methods for torque and flux control of induction motor i. In the last step, a defuzzifier converts the fuzzy outputs back to the crisp values. The paper presents fuzzy logic based direct torque control dtc scheme of an induction motor im and its comparative study using intelligent techniques under varying dynamic conditions are discussed.
Direct torque control of induction motor based on space vector modulation using a fuzzy logic speed controller abdesselem chikhi abstract in the paper, the proposed direct torque control using space vector modulation is based on fuzzy logic technique to replace proportional integral regulator pi antiwindup of the speed of induction motor, in. It allows high dynamic performance to be obtained with very simple hysteresis control scheme. Direct torque control of induction motor drive using pifuzzy. Direct torque control of doubly star induction motor using. Research paper on direct torque control using fuzzy logic. The present study emphasizes speed control by using an external speed loop with dtc controller. Index terms direct torque control, fuzzy logic duty ratio controller, induction motor. Direct torque control dtc of an induction motor fed by a voltage source inverter is a modest scheme that does not. Conventional direct torque control the dtc scheme is very simple in function. Pdf direct torque control for induction motor using fuzzy logic. Direct torque controlled induction motor drive system is implemented in matlabsimulink environment and the flc is developed using matlab fuzzy logic toolbox. Direct torque control of induction motor with fuzzy controller. The main objective of this paper is to ameliorate the performance of direct torque control of induction motor for a wide range of speed control using fuzzy logic. The speed control of the im is done by using the conventional proportional integral.
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