Simulation of direct torque control of induction motor. Apr 27, 2012 this model depicts all the aspects of a three phase induction motor starting from input three phases up to the electromagnetically generated torque and speed. Switching losses minimization by using direct torque. The direct torque control dtc strategy is studied in details and its relation to space vector modulation svm is emphasized. Using direct torque control of induction motor modelling and. The conventional dtc drive contains a pair of hysteresis comparators. Simulink model of direct torque control of induction machine.
The reference direct and quadrature dq components of the stator current, corresponding to the commanded rotor flux and torque, are derived based on the indirect vector control strategy. Direct torque control of induction motor machines physics. This drive features closedloop speed control based on the indirect or feedforward vector control method. Direct torque controlled induction motor drive with space vector. Torque ripple reduction based direct torque control for.
It has become a powerful control scheme for the control of induction motor drives and it considered as an alternative to the field oriented control foc strategy 2. Direct torque control dtc is an advanced control technique with fast and. Direct torque control of three phase induction motor using. Sep 08, 2016 maximum efficiency per torque direct flux vector control of induction motor drives. All models and controllers are simulated using matlab and simulink computer program. Create scripts with code, output, and formatted text in a single.
In this project, a dtc model has been developed and tested using a matlabsimulink package. Abstractdirect torque control is a control technique used in ac drive systems to obtain high performance torque control. Direct torque control is a control technique in ac drive systems to obtain high performance torque control. This calculator is based on motor equation synthesis. The simulink model of conventional direct torque control for induction motor and with fuzzy logic controller are shown in fig. This diagram shows the direct torque control architecture for singlephase machines the torque and flux estimation is based on machine voltage equations. Direct torque control is a control technique in ac drive systems to obtain high. Direct torque control of induction motor drive with flux. The discretetime equations for stator fluxes in the frame are. Simulink model of three phase induction motor file exchange. Mar, 2017 matlab simulink implementation of the direct torque control scheme for induction motors is presented in this paper. Feb 22, 2018 dtc induction motor drive matlab simulink. At the system level, a logic controller balances source and loads on the system bus. Different websites were used as a resource to develop the direct torque control.
Have a look at the simulink model direct torque control of an induction motor by syed abdul rahman kashif as a crossreference where the author has modelled the electrical and mechanical systems separately the way you want. An efficient method of induction motor control is the direct torque control dtc. Implement direct torque and flux control dtc induction. Dtc was originally developed for ac induction motors because of their popularity in myriad industrial and commercial applications. Many direct torque control techniques were appeared to. Maximum efficiency per torque direct flux vector control of induction motor drives. Modern improvement techniques of direct torque control for. This drive features closedloop speed control using hysteresisband torque and flux controllers. This model simulates direct torque control of a three phase induction motor.
Interruption on driven induction motors asd is considered as one of the sensitive loads to the voltage sag and short interruption that might cause the motor protection relay to trip, because the undervoltage of the dc link the ac current, which is feeding the motor, increases. Torque ripple reduction based direct torque control for induction motor drive. This involves calculating an estimate of the motor s magnetic flux and torque based on the measured voltage and current of the motor. Direct torque control of an induction motor file exchange.
Matlab simulink implementation of the direct torque control scheme for induction motors is presented in this paper. Direct torque control method is one of the best control strategies which allow a torque control in steady state and transient operation of induction motor. The speed usually deviates and the torque varies 29 51. Theoretical background for both methods is explained. Induction motor, stator reference frame, direct synthesis. Fieldoriented control induction motor drive matlab y simulink. Comparative study between vector control and direct torque. Using matlabsimulink software, here direct torque control of induction motor is implemented and the various fault issues of induction motor is presented with the help of fuzzy based fault. A new quickresponse and highefficiency control strategy of an induction motor. Direct torque control of doubly fed induction motor using threelevel.
The overall speed control system was modeled and simulated in matlab simulink. However, the low switching frequency of the dtc causes high ripples in the flux and torque that leads to an acoustic noise which degrades the control performances, especially at low speeds. When abb introduced its first direct torque control ac drive to the market in 1995, dtc was already a leading technology. Direct torque control of permanent magnet synchronous.
The subsystem controllers consist of feedback control loops encompassing sliding mode, bangbang, and conventional control laws. The dtc induction motor drive ac4 block represents an improved scalar control drive for induction motors with direct torque and flux control. Index terms electric machine, induction motor, simulink, simplorer, maxwell. Improvements in direct torque control of induction motor for. In this project, a dtc model has been developed and tested using a matlab simulink package. Control the rotor speed in an asynchronous machine asm drive using the scalar vf control method. Vector control of induction motor direct torque control. Direct torque control of doubly fed induction motor using. Direct torque control of induction motor free download as powerpoint presentation. Modeling and simulation of direct torque control induction. Torque control of induction motor using matlab simulink submitted by fathalla eldali department of electrical and computer engineering for the degree of master of science colorado state university fall 2012 1.
Induction machine direct torque control singlephase. In this paper, proportionalintegral pi controller has been presented to improve the system performance which gives better. The entire control scheme is implemented with matlab simulink. Of induction motor using fuzzy logic 1 reqthe code of direct torque control for inductor motor 0 control of 3 ph induction motor using direct torque control 1 part and inventory search.
Simulink model of direct torque control of induction machine core. Implement singlephase induction motor drive simulink. Simulink model of direct torque control of induction machine h. Direct torque control of induction motor eda board. The induction machine scalar control block implements an induction machine scalar, that is vf or vhz, control structure. Sensorless control of induction motor using simulink by. Implement vector controller model for singlephase induction.
The scheme is intuitive and easy to understand as a modular approach is followed. After the implementation of machine model, a sensorless control of induction motor using direct synthesis from state equations have been carried out by using matlab simulink for the evaluation of dynamic performance of induction motor. Speed estimator is implemented to control of speed of motor along with the torque. The speed control loop outputs the reference electromagnetic torque and rotor flux of the machine. Space vector pulse width modulation based speed control of induction motor using fuzzy pi controller. The magnetization control unit contains the logic for switching between magnetization and normal operation modes. The following figures present the block diagram of the controller for the two types of modulation. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque ripple. Maximum efficiency per torque direct flux vector control.
The discretetime voltage equations using the backward euler discretization method, are. The vector controller spim block implements vector control for a singlephase induction machine spim. The scheme of dtc has good dynamic performance, precise and quick control of stator flux. A novel matlab simulink model of pmsm drive using direct. Pdf simulation of direct torque control of induction motor. The fieldoriented control induction motor drive block represents a standard vector or rotor fieldoriented control drive for induction motors. The major drawbacks of conventional direct torque control are high torque, flux ripples and poor dynamic response at low speed. The system modeling and control are implemented in matlabsimulink environment. 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. This control method allows to reduce the torque and flux ripples as well as to optimize the total harmonic distortion thd of motor currents. May 27, 2017 matlab simulink implementation of the direct torque control scheme for induction motors is presented in this paper.
Direct torque control of permanent magnet synchronous motor. Dtc drives utilizing hysteresis comparators suffer from high torque ripple and variable switching frequency. Thus, their control techniques have received a lot of interest. Direct torque control, permanent magnet synchronous motor, space vector modulation 1 introduction direct torque control was introduced by i. Direct torque control dtc is an advanced control technique with fast and dynamic torque response. Due to its simplicity of use, matlab simulink is used to simulate the dynamic model of im and applying both techniques on it. Maximum efficiency per torque direct flux vector control of. Comparative study between vector control and direct torque control. The diagram shows the openloop vf control structure that the block implements.
Indicative of dtc performance with induction motors is torque response time to a 100% torque reference step that approaches the motors electrical time constant limit. The analysis of simulation results shows the better. The singlephase induction motor is asymmetrical due to the unequal resistances and inductances of the main and auxiliary windings. These two control strategies are different on the operation principle but their objectives are the same. Modeling and simulation of direct torque control induction motor. The induction machine direct torque control single phase block implements a singlephase induction machine direct torque control structure. The block diagrams show how the controller implements fieldoriented control foc or hysteresisbased direct torque control dtc for a spim. The block diagrams show how the controller implements fieldoriented control foc or hysteresisbased directtorque control dtc for a spim. Simulink model of three phase induction motor file. Pdf simulink model of direct torque control of induction. The machine speed is controlled in closed loop by direct torque control strategy. For more information, see the singlephase induction motor drive block. It is considered as an alternative to the field oriented control foc or vector control technique. Simscape electrical control induction machine control.
Xiaoyun an improved dtc algorithm for reducing torque ripples of pmsm based on cloud model and svm, international conference on multimedia. Noguchi 1 as a new performant control strategy for induction motor drives fed by voltage source inverters vsi. 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. In this paper, comparison between the matlabsimulink and ansys maxwell simplorer cosimulation is done for speed control of induction motor im based on the direct torque control strategy. The reference dq components of the stator current are then used to obtain the required gate signals for the inverter through a hysteresisband or pwm current.
The induction machine direct torque control block implements an induction machine direct torque. Simulation of direct torque control of induction motor using simulink, simplorer and maxwell software conference paper pdf available august 2015 with 2,023 reads how we. Conventional direct torque control dtc is one of the excellent control strategies available to control the torque of the induction machine im. Singlephase induction machine direct torque control. Induction machine vf control simulink mathworks france. Space vector trajectory is also plotted to observe the performance. Space vector modulation direct torque speed control of. Jun 17, 2017 direct torque control dtc is one of the most excellent control strategies of torque control in induction machine. Digital signal processor, direct field oriented control, direct signal processor, direct torque control, pulsewidth modulation.
The concept of direct torque control dtc was developed by takahashi and dpenbrock 1. The motor is started under different loads in two methods. The performance of an induction motor under the classical direct torque control method and improved scheme have been studied and confirmed by simulation using matlab. An svmbased dtc strategy is suggested and a controller design based on this strategy is presented. Alshawi, space vector modulation direct torque speed control of induction motor, thesis, nahrain university, dec. Each method is studied and discussed using supporting simulation of currents, torque, speed, efficiency and power factor curves. The converter transforms a reference speed to a reference electrical frequency. Equations this diagram shows the direct torque control architecture for singlephase machines. These methods, which have been used for three decayed are field orientation control foc and direct torque control dtc.
To obtain the mathematical model of the motor with constant parameters voltage, current, and flux, it is necessary to transform all the variables to the stationary reference frame d q fixed to the stator. Pdf direct torque control dtc is one of the most excellent control strategies of torque controlin induction. The speed control loop outputs the reference electromagnetic torque and stator flux of the machine. Direct torque control of three phase induction motor using matlab. The controller generates reference voltages from the reference frequency by maintaining a constant voltagetofrequency ratio through scalar vf control. Subsequent improvements in processor computational power, application programming, and communication interfaces have continually enabled higher dtc performance, providing premium motor control for a broad range of applications. Design of direct torque controller of induction motor dtc. Abstract various aspects related to controlling induction motors are investigated.
Modeling and simulation of direct torque control induction motor drives via constant volthertz technique. Jun 10, 20 this model simulates direct torque control of a three phase induction motor. At full load, the machine has a rated speed of 1440 r. To estimate the torque and flux, the induction machine direct torque control block discretizes the machine voltage equations in the stationary reference frame using the backward euler method. Direct torque control dtc is one of the most excellent control strategies of torque control in induction machine. Using matlab simulink software, here direct torque control of induction motor is implemented and the various fault issues of induction motor is presented with the help of fuzzy based fault. Simulation of 3ph induction motor in matlab with direct. The induction machine direct torque control singlephase block implements a singlephase induction machine direct torque control structure. This involves calculating an estimate of the motors magnetic flux and torque based on the measured voltage and current of the motor. A 6 kw three phase induction motor has been used in order to run and evaluate the developed model. The direct torque controller dtc is built with two types of modulation, hysteresis modulation and space vector modulation svm. Direct torque control, induction machine, vector control, matlabsimulink. Communities more files in the power electronics control community. Svpwm based speed control of induction motor with three level.
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