Asynchronous machine direct torque control with space vector. The dtc induction motor drive ac4 block represents an improved scalar control drive for induction motors with direct torque and flux control. It always exists that there are big ripples on flux linkage and electromagnet torque in traditional direct torque control dtc system. There are two wellestablished control strategies for highperformance motor drives. Its operation is based on the equation of the developed electromagnetic torque of the motor.
Space vector modulation of multilevel converters and application. The foc method has received wide acceptance in industry. Field orientation control foc and direct torque control dtc 1,2,3. 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. For continuous spacevector schemes, in the linear modulation range, both and are used in one switching cycle, that is, and. Space vector modulation svm is an algorithm for the control of pulse width modulation pwm. Pdf space vector modulation direct torque speed control of. The direct torque controller generates the reference voltages required by the space vector modulator. 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. The designed model free adaptive direct torque control mfadtc method depends merely on the input and the output data of the asynchronous motor. The direct torque and flux control is also called direct torque control dtc and is an. T he dtc svm te chnique operates with constant switching frequency.
Design and implementation of a direct torque control space. Principle of space vector pwm treats the sinusoidal voltage as a constant amplitude vector rotating at constant frequency. An955, vf control of 3phase induction motor using space. Pdf evaluation of direct torque control using space vector.
Field oriented control for space vector modulation based. The principle is based on simultaneously decoupling the. Analysis and realization of a pulsewidth modulator based on. 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. Signal spaces and basis functions study of signal spaces provides us with a geometric method of conceptualizing the modulation process. A pibased speed controller supplies the torque reference. A new direct torque control strategy for flux and torque ripple reduction for induction motors drive by using space vector modulation. In figure 5 is presented the simulink block diagram of the proposed dtcsvm scheme. 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. 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. Space vector modulation of multilevel converters and. Threelevel direct torque control based on space vector modulation of double star synchronous.
If either the estimated flux or torque deviates too far from the reference tolerance, the transistors of. A novel electric vehicle drive studies based on space. In conventional direct torque control dtc has, over the years, become of the most popular methods of control for induction motors im drive system. Electronics free fulltext evaluation of direct torque. Download evaluation of direct torque control using space vector modulation for electric vehicle applications complete project report. Space vector modulation direct torque speed control of.
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. 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. This example shows how to control an asynchronous machine asm using the direct torque control method with space vector modulator. The implement of space vector modulation svm was researched indepth.
Direct torque control of sensorless induction motor drive using space vector modulation. Fuzzy speed regulator for induction motor direct torque. A dspbased discrete space vector modulation torque. Tuning pi regulators for threephase induction motor space vector modulation direct torque control using complex. Part of the communications in computer and information science book series. Pdf direct torque control of induction motor drives. Modern improvement techniques of direct torque control for. Direct torque control of brushless dc drives with reduced torque ripple yong liu. 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. Ijca direct torque control of sensorless induction motor. Implement space vector modulator for pwm vsi ac motor drive. Study in direct torque control of induction motor by using space vector modulation abstract. Direct torque control of brushless dc drives with reduced.
In section vi summarizes and comments the simulation results obtained, while section vii concludes the paper. Brushless dc bldc drives, space vector modulation svpwm, simulink, pi control. Nevertheless, it is complex because of the requirement for two proportionalintegral pi regulators, space vector modulation svm, and frame transformation, which also needs the. Direct torque control of induction motor using space. In this paper, a novel torque control scheme for induction motors is proposed. Direct torque control of permanent magnet synchronous motor.
Analysis of direct torque control with pace vector modulation for. 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. Matlabsimulink is used analyse the simulated results and is shown that svpwm results in a faster dynamic response. Analysis of induction motor drive with direct torque.
Alshawi, space vector modulation direct torque speed control of induction motor, thesis, nahrain university, dec. Modelfree adaptive direct torque control for the speed. Refer to appendix a for a description of the space vector pwm module. Asynchronous machine direct torque control with space. Dtc is a method to control machine with utilizing torque and flux of motor controlled. Novel flux and torque control of induction motor drive using four switch inverterinverter this strategy is penalized by low dynamic and high ripple of the 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.
Space vector modulation a different approach to pwm modulation is based on the space vector representation of the voltages in the cy, 3 plane. A novel matlabsimulink model of pmsm drive using direct. Pdf direct torque controlbased space vector pulse width. In this way, the direct torque control space vector modulation dtcsvm technic is used for to optimize the switching selection table and offer more voltage space vector than traditional dtc 8, 9. The direct torque control dtc for induction machines was proposed in the middle of 1980s by takahashi and depenbrock. 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. Threelevel direct torque control based on space vect or modulation of double star synchronous. Relationship between spacevector modulation and threephase.
Most of the chapters focus on modern control methods of inductionmachine drives, such as vector and direct torque control. Direct torque control of induction motor using space vector. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque ripple. Direct torque control dtc of switched reluctance motor is known straightforward control structure with similar execution to that of field situated control strategies. Direct torque control allows a good torque control in steady state and transient operating conditions. Direct torque control of sensorless induction motor drive. The direct torque controller dtc is built with two types of modulation, hysteresis modulation and space vector modulation svm. 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. The most economical im speed control methods are realized by using frequency converters. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the. Tuning pi regulators for threephase induction motor space vector.
Hasse in terms of proposing indirect vector control, blaschke in terms of. The direct torque control dtc strategy is studied in details and its relation to space vector modulation svm is emphasized. 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. Torque ripple reduction of direct torque controlled induction. The direct torque control based on space vect or modulation strategy is described in section v.
Abstract various aspects related to controlling induction motors are investigated. The space vector modulator block consists of seven main blocks. 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. A good example of hysteresis control is discussed later in this book, in relation to chopper. A novel 4wd electric vehicle control strategy based on direct. The speed of four wheels is calculated independently during the turning with the electronic differential system. Pdf evaluation of direct torque control using space. High performance direct torque control of induction motor. A dspbased discrete space vector modulation torque control. One component defines the magnetic flux of the motor, the other the torque. The direct torque control scheme is characterized by the absence of pi regulators, coordinate transformations, current regulators and pulse width modulated signal generators.
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. 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. Space vector modulation svm direct torque control dtc permanent magnet. Eu council directives and adjustable speed electrical power. It is used for the creation of alternating current ac waveforms. Variablestructure torque control of induction motors using. Anfis based space vector modulationdtc for switched. Introduction in recent years, several studies have been developed which propose alternative solutions to the foc control motor drive. There is another control method available with the same torque control feature. 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. Evaluation of direct torque control using space vector modulation for electric vehicle applications complete project report pdf free. Noguchi 1 as a new performant control strategy for induction motor drives fed by voltage source inverters vsi. Pdf space vector modulation an introduction tutorial at. The stator flux and torque close loop control is achieved by the dtcsvm unit.
A single stator voltage vector of the inverter standard topology is selected every control sampling. 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. The estimated flux magnitude and torque are then compared with their reference values. The reason for this is due to the application of unbalanced voltage vector to control flux and torque. This paper presents the results of an investigation into the suitability of a direct torque control method for an electric vehicle application. Manias, in power electronics and motor drive systems, 2017. The control scheme used and the test system that has been developed are explained. Space vector modulated direct torque control for pmsm. Many different topologies of frequency converters are proposed and investigated in a literature. The direct torque control based on space vector modulation strategy is described in section v. Part of the advances in intelligent and soft computing book series ainsc, volume 105.
Space vector modulated direct torque controlled dtcsvm. Torque ripple reduction of direct torque controlled. Pdf improved direct torque control of induction motor. Torque is estimated as a cross product of estimated stator flux linkage vector and measured motor current vector. 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. In order to test and compare the proposed direct torque control method with. In this article, the direct torque control with space vector modulation is analysed as a possible candidate for synchronous reluctance motor. There are variations of svm that result in different quality and computational requirements. 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.
In a physical space when we describe a vector by its coordinates x, y. Control of induction motor fed with inverter using direct. The following figures present the block diagram of the controller for the two types of modulation. 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. The control system of the drive calculates the corresponding. This guarantees sector detection that is very stable and free of disturbances, even under. Space vector modulation was applied in the linear region, thus the voltage vector at the inverter output is. A novel electric vehicle drive studies based on space vector. Stator flux linkage is estimated by integrating the stator voltages. The modulation depths are fed to a space vector pwm modulator via a vector rotator converts dc to ac waveform. Space vector pwm methodology may be applied as future work to dtc drive system to cut back the torque torsion ripple. 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. Moreover, for spacevector pwm, there is a degree of freedom in the choice of zero vectors in one switching cycle, i. An svmbased dtc strategy is suggested and a controller design based on this strategy is presented.
The direct torque control technique based on space vector modulation. Coordinate transformation abc reference frame to the stationary dq frame. Pdf table of content modeling and implementation of space vector modulation for threephase direct torque control matrix converter table of content. By controlling the amplitude and the frequency of vs, the motor voltage and the motor frequency can be controlled.
Direct torque control of induction motor copy free download as powerpoint presentation. Space vector modulation of multilevel converters and application crescent onyebuchi, omeje, marcel, agu on. Modeling and implementation of space vector modulation for. Modeling and simulation are approved out using the matlabsimulink tool to study the performance of 4wd proposed system. Threelevel direct torque control based on space vector. Abstractthis paper presents a torque and flux control method for an induction motor drive. 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.
The cy, 3 components are found by park transform, where the total power, as well as the impedances, remains unchanged see also 23. Pdf direct torque control using space vector modulation and. Direct torque control of induction motor copy magnetic. 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. Ieee 32nd annual power electronics specialists conference, pesc 2001, vancouver, canada, vol. The present study deals with space vector modulation svm in. A threephase voltage vector is transformed into a vector in the stationary dq coordinate frame which represents the spatial vector. A novel 4wd electric vehicle control strategy based on. Direct torque control of induction motors based on space. Direct torque control an overview sciencedirect topics.
At each cycle period, svm method is utilized to get the reference voltage space vector to precisely remunerate the motion and torque errors. Springer nature is making sarscov2 and covid19 research free. 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. Direct torque control, permanent magnet synchronous motor, space vector modulation 1 introduction direct torque control was introduced by i. Fuzzy logic space vector direct torque control of pmsm for. 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. Therefore, the direct torque control with space vector. Direct torque control of permanent magnet synchronous. This paper proposes design and simulation of a direct torque controlled induction motor drive system based on space vector modulation technique for ripple reduction. 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. Direct torque control is a control technique used in ac drive systems to obtain high performance torque control.
Design and implementation of a direct torque control space vector. Fuzzy speed regulator for induction motor direct torque control scheme. 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. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque. This drive features closedloop speed control using hysteresisband torque and flux controllers. Direct torque control direct torque control dtc was proposed by m. Figure 2, by generating the voltage command for inverter control. Study in direct torque control of induction motor by using. Mar 15, 2008 study in direct torque control of induction motor by using space vector modulation abstract.
Implement direct torque and flux control dtc induction. 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. The space vector modulator block generates pulses for either a detailed or averagevalue threephase inverter following the space vector pulsewidth modulation strategy. An effective direct torque control based on space vector. 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 disadvantages of conventional direct torque control.
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