Pdf space vector modulation an introduction tutorial at. T he dtc svm te chnique operates with constant switching frequency. The space vector modulator block generates pulses for either a detailed or averagevalue threephase inverter following the space vector pulsewidth modulation strategy. The following figures present the block diagram of the controller for the two types of modulation. Dtcsvm the block scheme of the investigated direct torque control with space vector modulation dtcsvm for voltage source inverter vsi fed pmsm is presented in figure. Alshawi, space vector modulation direct torque speed control of induction motor, thesis, nahrain university, dec. Space vector modulated direct torque control for pmsm. Space vector modulation a different approach to pwm modulation is based on the space vector representation of the voltages in the cy, 3 plane. U ref m ui e 2 3 where ui is the modulus of the inverter basic space vectors. Pdf direct torque control dtc is known to produce quick and robust response in alternating current drives. There are variations of svm that result in different quality and computational requirements. This paper presents the results of an investigation into the suitability of a direct torque control method for an electric vehicle application. Therefore, the direct torque control with space vector.
In this study, direct torque control dtc of induction motor is evaluated based on space vector modulation svm, it is able to reduce the acoustical noise, the torque, flux, current, and speed. Moreover, for spacevector pwm, there is a degree of freedom in the choice of zero vectors in one switching cycle, i. Direct torque control of brushless dc drives with reduced torque ripple yong liu. Pdf improved direct torque control of induction motor. Ijca direct torque control of sensorless induction motor.
A dspbased discrete space vector modulation torque control. Tuning pi regulators for threephase induction motor space vector modulation direct torque control using complex. Mar 15, 2008 study in direct torque control of induction motor by using space vector modulation abstract. Vector control, also called fieldoriented control foc, is a variablefrequency drive vfd control method in which the stator currents of a threephase ac electric motor are identified as two orthogonal components that can be visualized with a vector. The stator flux and the electrical torque are directly controlled by variablestructure controllers, and stator voltage vectors calculated by the variablestructure controllers are applied to the motor by means of space vector modulation. Field oriented control for space vector modulation based. Implement direct torque and flux control dtc induction. An induction motor control by space vector pwm technique. Relationship between spacevector modulation and threephase. The estimated flux magnitude and torque are then compared with their reference values. An svmbased dtc strategy is suggested and a controller design based. Direct torque control allows a good torque control in steady state and transient operating conditions.
Modelfree adaptive direct torque control for the speed. The direct torque controller generates the reference voltages required by the space vector modulator. This paper proposes design and simulation of a direct torque controlled induction motor drive system based on space vector modulation technique for ripple reduction. Space vector modulation svm direct torque control dtc permanent magnet. The direct torque control based on space vector modulation strategy is described in section v. Asynchronous machine direct torque control with space vector. At each cycle period, svm method is utilized to get the reference voltage space vector to precisely remunerate the motion and torque errors.
In order to reduce the torque and flux pulsations and, implicitly, the current harmonics content, in contrast to the standard dtc, we do use decoupled pid flux and torque controllers and space vector modulation. Stator flux linkage is estimated by integrating the stator voltages. Study in direct torque control of induction motor by using space vector modulation abstract. The foc method has received wide acceptance in industry. It is used for the creation of alternating current ac waveforms.
Pdf table of content modeling and implementation of space vector modulation for threephase direct torque control matrix converter table of content. Direct torque control of induction motor copy magnetic. Study in direct torque control of induction motor by using. The dtc induction motor drive ac4 block represents an improved scalar control drive for induction motors with direct torque and flux control. A novel 4wd electric vehicle control strategy based on direct. Fuzzy logic space vector direct torque control of pmsm for. Direct torque control of induction motor copy free download as powerpoint presentation. Figure 2, by generating the voltage command for inverter control. Design and implementation of a direct torque control space vector.
Fuzzy speed regulator for induction motor direct torque. The implement of space vector modulation svm was researched indepth. The speed control loop outputs the reference electromagnetic torque and stator flux of the machine. The space vector modulation svm is the method of converting three phase quantities into two space vector quantities and hence it will be converted into polar form 8. The control method uses the torque and speed estimation to control the load angle and to obtain the appropriate flux vector trajectory from which the voltage vector is directly derived based on direct torque control methods. The designed model free adaptive direct torque control mfadtc method depends merely on the input and the output data of the asynchronous motor. In a physical space when we describe a vector by its coordinates x, y. Direct torque control, permanent magnet synchronous motor, space vector modulation 1 introduction direct torque control was introduced by i. Pdf space vector modulation direct torque speed control of. In this paper, a model free adaptive direct torque control mfadtc method for the speed regulation of asynchronous motors is proposed to solve the problems of modeling difficulties and poor antidisturbance ability of the asynchronous motor.
It has an added advantage of a 15% increase in available bus voltagegood news for engineers wanting to make their motors go faster on the same bus voltage. Electronics free fulltext evaluation of direct torque. Asynchronous machine direct torque control with space. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque ripple. Coordinate transformation abc reference frame to the stationary dq frame. The control system of the drive calculates the corresponding. Space vector modulated direct torque controlled dtcsvm. Space vector pwm methodology may be applied as future work to dtc drive system to cut back the torque torsion ripple. Direct torque control of permanent magnet synchronous.
Principle of space vector pwm treats the sinusoidal voltage as a constant amplitude vector rotating at constant frequency. Modeling and implementation of space vector modulation for. Analysis of induction motor drive with direct torque. Comparing to the vector control, it is less sensitive to parametric variations of the machine 18, 39, its control algorithm is simple because of the absence of pulse width modulation pwm, of current controllers and park transformations 40, 41.
Acceleration, steering and speed reference computations are ensured by the electronic differential, this driving process permit to steer each driving wheels at any curve separately. Many different topologies of frequency converters are proposed and investigated in a literature. A novel 4wd electric vehicle control strategy based on. If either the estimated flux or torque deviates too far from the reference tolerance, the transistors of. Refer to appendix a for a description of the space vector pwm module. The most economical im speed control methods are realized by using frequency converters.
The principle is based on simultaneously decoupling the. Among others, the book addresses sensorless control techniques, modulation strategies, parameter identification, artificial intelligence, operation under harsh or failure conditions, and modelling of electric or magnetic. Introduction in recent years, several studies have been developed which propose alternative solutions to the foc control motor drive. Design and implementation of a direct torque control space. This example shows how to control an asynchronous machine asm using the direct torque control method with space vector modulator. Direct torque control of induction motor using space vector modulation svmdtc abstract in this study, direct torque control dtc of induction motor is evaluated based on space vector modulation svm. Modern improvement techniques of direct torque control for. Evaluation of direct torque control using space vector modulation for electric vehicle applications complete project report pdf free. Fourwheelsdrive 4wd electric vehicle ev controlled with direct torque control based space vector modulation dtcsvm is presented, where the electrical traction chain was well analyzed and studied from the lithium battery, the buck boost to the mechanical load behavior. Space vector modulation of multilevel converters and application. Abstract various aspects related to controlling induction motors are investigated. It always exists that there are big ripples on flux linkage and electromagnet torque in traditional direct torque control dtc system. The control scheme used and the test system that has been developed are explained.
Direct torque controlbased space vector pulse width modulation of a two level. Pdf evaluation of direct torque control using space vector. Coordinate torque control in view of space vector modulation dtcsvm save dtc transient benefits, besides, create better quality steady state execution in a wide speed extend. Ieee 32nd annual power electronics specialists conference, pesc 2001, vancouver, canada, vol. An955, vf control of 3phase induction motor using space. The space vector modulation technique svm is applied during this project to two level electrical converter inverter within the direct torque management primarily based on induction motor drive system. Hasse in terms of proposing indirect vector control, blaschke in terms of. Space vector modulation was applied in the linear region, thus the voltage vector at the inverter output is.
In section vi summarizes and comments the simulation results obtained, while section vii concludes the paper. There is another control method available with the same torque control feature. Threelevel direct torque control based on space vector modulation of double star synchronous. The modulation depths are fed to a space vector pwm modulator via a vector rotator converts dc to ac waveform. The direct torque control dtc strategy is studied in details and its relation to space vector modulation svm is emphasized. Nevertheless, it is complex because of the requirement for two proportionalintegral pi regulators, space vector modulation svm, and frame transformation, which also needs the. Most of the chapters focus on modern control methods of inductionmachine drives, such as vector and direct torque control. The direct torque control scheme is characterized by the absence of pi regulators, coordinate transformations, current regulators and pulse width modulated signal generators. A new direct torque control strategy for flux and torque ripple reduction for induction motors drive by using space vector modulation. In any case, the part of ideal determination of the voltage space vector is one of the weakest focuses in a routine dtc drive because of adjustable switching frequency and high torque ripple. The direct torque control technique based on space vector modulation.
Field orientation control foc and direct torque control dtc 1,2,3. Manias, in power electronics and motor drive systems, 2017. Space vector modulation direct torque speed control of. A single stator voltage vector of the inverter standard topology is selected every control sampling. A pibased speed controller supplies the torque reference. Threelevel direct torque control based on space vector. Control of induction motor fed with inverter using direct. Springer nature is making sarscov2 and covid19 research free. New direct torque field oriented control, direct control scheme of torque induction motor for control dtc, and dtc using vinod kumar vudatha, nit electric vehicle. Its operation is based on the equation of the developed electromagnetic torque of the motor. Part of the advances in intelligent and soft computing book series ainsc, volume 105.
Torque ripple reduction of direct torque controlled. The speed of four wheels is calculated independently during the turning with the electronic differential system. Direct torque control of permanent magnet synchronous motor. An effective direct torque control based on space vector. Variablestructure torque control of induction motors using. Pdf direct torque controlbased space vector pulse width. Pdf direct torque control using space vector modulation and.
In conventional direct torque control dtc has, over the years, become of the most popular methods of control for induction motors im drive system. This guarantees sector detection that is very stable and free of disturbances, even under. In order to test and compare the proposed direct torque control method with. A threephase voltage vector is transformed into a vector in the stationary dq coordinate frame which represents the spatial vector. Pdf direct torque control of induction motor drives. Analysis of direct torque control with pace vector modulation for. One component defines the magnetic flux of the motor, the other the torque. The space vector modulator block consists of seven main blocks. The two most important parameters electromagnetic torque and stator flux linkage are easily controlled by using direct torque control strategy with the help of space vector modulation dtcsvm by. For continuous spacevector schemes, in the linear modulation range, both and are used in one switching cycle, that is, and.
Matlabsimulink is used analyse the simulated results and is shown that svpwm results in a faster dynamic response. In this paper, a novel torque control scheme for induction motors is proposed. Direct torque control scheme using space vector modulation submitted by vudatha vinod kumar, to the electrical engineering department, national institute of technology, rourkela, in partial fulfillment of the prerequisites for the award of the degree of master of. This paper presents a sensorless induction motor control scheme using an adaptive observer for the stator flux and the rotor speed estimation based on discrete space vector modulation dsvmdtc switching strategy.
Space vector modulation of multilevel converters and application crescent onyebuchi, omeje, marcel, agu on. Signal spaces and basis functions study of signal spaces provides us with a geometric method of conceptualizing the modulation process. The direct torque and flux control is also called direct torque control dtc and is an. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the. The present study deals with space vector modulation svm in. There are two wellestablished control strategies for highperformance motor drives. Direct torque control an overview sciencedirect topics.
This drive features closedloop speed control using hysteresisband torque and flux controllers. Download evaluation of direct torque control using space vector modulation for electric vehicle applications complete project report. Induction motor, field oriented control foc, direct torque control dtc, sensorless, space vector pulse width modulation svpwm. Anfis based space vector modulationdtc for switched. Space vector modulation of multilevel converters and. In figure 5 is presented the simulink block diagram of the proposed dtcsvm scheme. Direct torque control of sensorless induction motor drive using space vector modulation. Direct torque control of induction motor using space vector. A novel electric vehicle drive studies based on space vector. Dtc is a method to control machine with utilizing torque and flux of motor controlled.
The direct torque control based on space vect or modulation strategy is described in section v. Abstractthis paper presents a torque and flux control method for an induction motor drive. Implement space vector modulator for pwm vsi ac motor drive. The direct torque controller dtc is built with two types of modulation, hysteresis modulation and space vector modulation svm. However, a converter consisting of a diode rectifier, a dclink and a pulse width modulated pwm voltage inverter is the most applied used in industry see. Direct torque control of induction motors based on space. A novel electric vehicle drive studies based on space. A dspbased discrete space vector modulation torque. In yet another method, the maximum input linetoline voltage is discarded in pwm modulation when the modulation factor is low, thus suppressing harmonics in the output voltage 9. Direct torque control of sensorless induction motor drive. Eu council directives and adjustable speed electrical power. Duke university of canterbury new zealand abstract this paper presents the results of an investigation into the suitability of a direct torque control method for an electric vehicle application. Fuzzy speed regulator for induction motor direct torque control scheme. High performance direct torque control of induction motor.
Direct torque control of brushless dc drives with reduced. Part of the communications in computer and information science book series. An svmbased dtc strategy is suggested and a controller design based on this strategy is presented. The reason for this is due to the application of unbalanced voltage vector to control flux and torque. Tuning pi regulators for threephase induction motor space vector. This paper has proposed an efficient direct torque control strategy based on space vector modulation svmdtc for dual threephase permanent magnet synchronous motor dtppmsm, which is implemented in a synchronous reference frame aligned with the machine stator flux vector.
Direct torque control of induction motor using space. Direct torque control direct torque control dtc was proposed by m. Analysis of induction motor drive with direct torque control scheme using space vector modulation a report submitted in partial fulfillment of the requirements for the degree of master of technology in electrical engineering power electronics and drives by vudatha vinod kumar roll no. Torque ripple reduction of direct torque controlled induction. The stator flux and torque close loop control is achieved by the dtcsvm unit. In this article, the direct torque control with space vector modulation is analysed as a possible candidate for synchronous reluctance motor. The cy, 3 components are found by park transform, where the total power, as well as the impedances, remains unchanged see also 23. Brushless dc bldc drives, space vector modulation svpwm, simulink, pi control. Direct torque control strategy based space vector modulation svmdtc in this technique two proportional integral pi type con trollers are used instead of hysteresis band regulating the torque and the magnitude of flux as it shown in.
Control of indu ction motor fed with inverter using dir ect torque control space vector modulation technique vikas goswami 1, s ulochana wadhwani 2 1 department of electrical engineering, mits gw alior 2 department of electrical engi neering, mits gwalior. Space vector modulation svm is an algorithm for the control of pulse width modulation pwm. A novel matlabsimulink model of pmsm drive using direct. A good example of hysteresis control is discussed later in this book, in relation to chopper. Analysis and realization of a pulsewidth modulator based on. Threelevel direct torque control based on space vect or modulation of double star synchronous.
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