Modern improvement techniques of direct torque control for. Conventional principles of direct torque control and space vector pulse width modulation were described. Dtcsvm algorithm uses linear pi torque and flux for control instead of stator current components. Space vector based random pwm algorithms based direct.
Alshawi, space vector modulation direct torque speed control of induction motor, thesis, nahrain university, dec. Direct torque control of induction motor based on space. In figure 5 is presented the simulink block diagram of the proposed dtcsvm scheme. 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. A novel electric vehicle drive studies based on space.
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 direct torque controller generates the reference voltages required by the space vector modulator. Direct torque control allows a good torque control in steady state and transient operating conditions. Space vector modulated direct torque control for pmsm.
For continuous spacevector schemes, in the linear modulation range, both and are used in one switching cycle, that is, and. 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. Torque ripple reduction of direct torque controlled induction. In this paper the problem of the space vector modulation of fivephase inverters is completely solved extending the theory of space vector modulation used for traditional threephase voltage source inverters and introducing the concept of reciprocal vector. General theory of space vector modulation for fivephase.
Modeling and simulation of space vector pulse width. The performances of direct torque control dtc of induction machine are highly related to the inverter used therewith. In this study, direct torque control dtc of induction motor is evaluated based on space vector modulation svm. Torque control is preferred for electric vehicle applications instead of precise closed. This barcode number lets you verify that youre getting exactly the right version or edition of. Abstract direct torque control dtc with space vector modulation svm ensures constant switching frequency and highperformance operation, both in the steady state and under transient conditions. Reduction of emi with chaotic space vector modulation in. In this article, the direct torque control with space vector modulation is analysed as a possible candidate for synchronous reluctance motor. Pdf improved direct torque control of induction motor. 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. Technical report by elektronika ir elektrotechnika. U ref m ui e 2 3 where ui is the modulus of the inverter basic space vectors. Part of the advances in intelligent and soft computing book series ainsc, volume. In order to control the speed of pmsm several closed loop speed loop control systems such as sensorless control 10 and direct torque control 11 schemes are familiar.
The present study deals with space vector modulation svm in. This paper describes a combination of direct torque control dtc and space vector modulation svm for an adjustable speed sensorless. Combining the principles of variable structure, direct torque control, and space vector modulation for induction motor fed by matrix converter w. Manias, in power electronics and motor drive systems, 2017.
Direct torque control of induction machines using space vector modulation. Pdf application of space vector modulation in direct. Pdf evaluation of direct torque control using space. Direct torque control using space vector modulation and. This example shows how to control an asynchronous machine asm using the direct torque control method with space vector modulator. Simulation of direct torque controlled inductionmotor. Control of induction motor fed with inverter using direct. 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. Pdf direct torque control using space vector modulation and. Permanent magnet synchronous motor, direct torque control, space vector modulation abstract in this study, the structure and the control methods of permanent magnet synchronous motor pmsm are analysed and a simulation is realized using conventional direct torque control dtc method. The internal structure of the predictive torque and flux controller is shown in figure.
A novel 4wd electric vehicle control strategy based on. Principle of space vector pwm treats the sinusoidal voltage as a constant amplitude vector rotating at constant frequency. This method is an advantage because of increased flexibility in the choice of switching vector for both input current and output voltage control. Coordinate transformation abc reference frame to the stationary dq frame. Direct torque control of induction motor using space vector modulation svmdtc. The direct torque control technique based on space vector modulation. Direct torque control is a control technique used in ac drive systems to obtain high performance torque control. 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. Principles of induction motors and simulation of direct torque. Flux vector control achieves full torque at zero speed, giving it a performance very close to that of a dc drive. There is another control method available with the same torque control feature. 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.
Space vector modulation and control of multilevel converters. Abstract this paper presents a direct torque control based on space vector modulation of the salientpole double star synchronous machine drive fed by two threelevel neutral point clamped inverters. 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. In order to test and compare the proposed direct torque control method with.
Principles of induction motors and simulation of direct torque control using space vector modulation kindle edition by maxman, kristeine. This drive features closedloop speed control using hysteresisband torque and flux controllers. Design and implementation of a direct torque control space vector. It can be used in various applications like electric vehicles, and industrial control where. Its operation is based on the equation of the developed electromagnetic torque of the motor. In order to improve direct torque control dtc system dynamic performance and lowspeed performance for space vector modulation svm were analysed. This paper considers the application of direct torque control. The direct torque control dtc strategy is studied in details and its relation to space vector modulation svm is. In the direct torque control, the problem of speed overshoot and considerable fluctuation during pi control is adopted.
The principle is based on simultaneously decoupling the stator flux and electromagnetic torque. Space vector modulation was applied in the linear region, thus the voltage vector at the inverter output is. A dspbased discrete space vector modulation torque control. Asynchronous machine direct torque control with space vector. Combining the principles of variable structure, direct. Direct torque control using space vector modulation and dynamic performance of the drive, via a fuzzy logic controller for speed regulation. 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. Its operation is based on the equation of the developed electromagnetic torque.
Direct torque control using space vector modulation and dynamic performance of the drive, via a fuzzy logic controller for speed regulation 55 a b fig. This type of inverters has several advantages over the standard twolevel inverter, such as a greater number of levels in the output voltage. Direct torque control of induction motor using space. 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. This article is devoted to the presentation of a comparison study between two dtcsvm approaches for electric propulsion systems applications. Principles of induction motors and simulation of direct torque control using space vector modulation. Improvement of direct torque control by using a space vector. Direct torque control of permanent magnet synchronous. The plane is divided into six different sectors spaced by 60 degrees. At each cycle period, svm method is utilized to get the reference voltage space vector to precisely remunerate the motion and torque errors. Space vector modulation direct torque speed control of induction. An induction motor control by space vector pwm technique.
Direct torque control of permanent magnet synchronous motor. Direct torque control of induction motors based on. The theory of the direct torque control was developed by depenbrock, 1985 for the first. 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. Electrical torque distortion of the machine under original direct torque control is relatively high and if proper measures are taken it.
The most common of these accurate vector controls is presented in this document. The two pi controllers which were used to generate reference voltage vector in conventional svmdtc were analyzed. Implement direct torque and flux control dtc induction. If either the estimated flux or torque deviates too far from the reference tolerance, the transistors. At each cycle period, svm technique is used to obtain the reference voltage space vector to exactly compensate the flux and torque errors. Torque is estimated as a cross product of estimated stator flux linkage vector and measured motor current vector. Jianguo college of electrical engineering, shanghai jiao tong university, shanghai 200240, china abstract. It always exists that there are big ripples on flux linkage and electromagnet torque in traditional direct torque control dtc system. For induction motors, direct torque control dtc was proposed as an alternative control scheme in 1 and became very. 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. Modeling and simulation are approved out using the matlabsimulink tool to study the performance of 4wd proposed system.
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. The control scheme used and the test system that has been developed are explained. Assessment of direct torque control for induction motor drives. One component defines the magnetic flux of the motor, the other the torque. Dtc has been successfully applied to induction machines 10, 11, and, more recently, to blac machines 12. It is used for the creation of alternating current ac waveforms. Direct torque control direct torque control dtc was proposed by m. Analysis of direct torque control with pace vector modulation for. Space vector modulation svm is an algorithm for the control of pulse width modulation pwm. This paper presents the results of an investigation into the suitability of a direct torque control method for an electric vehicle application. Direct torque control based on space vector modulation dtcsvm preserve dtc transient merits, furthermore, produce better quality steadystate performance in a wide speed range. The stator flux and torque close loop control is achieved by the dtcsvm unit.
Threelevel direct torque control based on space vector. The paper deals with an improvement of direct torque control method for permanent magnet synchronous motor drives. Variablestructure torque control of induction motors using. Recently, robust torque and flux control algorithm can be. The direct torque control dtc strategy is studied in details and its relation to space vector modulation svm is emphasized. 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.
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. In this paper, a novel torque control scheme for induction motors is proposed. The dtc induction motor drive ac4 block represents an improved scalar control drive for induction motors with direct torque and flux control. Direct torque control, permanent magnet synchronous motor, space vector modulation 1 introduction direct torque control was introduced by i. Engineering and manufacturing chaos theory analysis chaotic systems electromagnetic interference pulse duration modulation pulseduration modulation. Dtc is preferred over other controlling schemes for high dynamic applications, but, on the other hand, shows higher current and torque ripple. Tuning pi regulators for threephase induction motor space vector.
The basic concept of direct torque control of induction machines is investigated in order to emphasize the effects produced by a given voltage vector on stator flux and torque variations. A threephase voltage vector is transformed into a vector in the stationary dq coordinate frame which represents the spatial 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. The control method that is used is a modified direct torque control dtc scheme with constant switching frequency, using space vector modulation svm. Stator flux linkage is estimated by integrating the stator voltages. Direct torque control of brushless dc drives with reduced. Direct torque control using space vector modulation and dynamic.
Direct torque control an overview sciencedirect topics. Direct torque control of induction motors based on space. Direct torque control of permanent magnet synchronous motors an overview. Figure 2, by generating the voltage command for inverter control. Anfis based space vector modulationdtc for switched. Relationship between spacevector modulation and threephase. T he dtc svm te chnique operates with constant switching frequency. Principle of space vector modulation svpwm areference stator vector b modulation of space vector during one swit ching period which is equal to sampling time of the dtcsvm method. A dspbased discrete space vector modulation torque.
The flux sector seeker block finds the sector of the plane in which the flux vector lies. The parameters of pi controller are difficult to determine. Reduction of emi with chaotic space vector modulation in direct torque control. Space vector modulation direct torque speed control of. Space vector pulse width modulation a threephase voltage source inverter has eight switching states as shown in fig 2 dc fig. Space vector modulation svm direct torque control dtc permanent. The direct torque control dtc for induction machines was proposed in the middle of 1980s by takahashi and depenbrock. Use features like bookmarks, note taking and highlighting while reading principles of induction motors and simulation of direct torque control using space vector modulation. This paper proposes design and simulation of a direct torque controlled induction motor drive system based on space vector modulation technique for ripple reduction. An svmbased dtc strategy is suggested and a controller design based. Noguchi 1 as a new performant control strategy for induction motor drives fed by voltage source inverters vsi. A novel 4wd electric vehicle control strategy based on direct. Download it once and read it on your kindle device, pc, phones or tablets.
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. The implement of space vector modulation svm was researched indepth. Study in direct torque control of induction motor by using. Asynchronous machine direct torque control with space. Implementation of a direct control algorithm for induction motors based on discrete space vector modulation abstract. Part of the communications in computer and information science book.
Pdf evaluation of direct torque control using space vector. Torque ripple reduction of direct torque controlled. Tuning pi regulators for threephase induction motor space vector modulation direct torque control using complex transfer function concept. The synovial speed controller is designed, and the space vector pulse width modulation technology svpwm is adopted to stabilize the inverter switching frequency. A new technique for the torque control of induction motors was developed and presented by i. 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. High performance direct torque control of induction motor. Direct torque controlbased space vector pulse width modulation of a two level inverterfed three phase alternating current induction motor using matlab. Direct torque control for induction motor based on fuzzy. Novel direct torque control based on space vector modulation.
Balazovic, 2003 published a technical guide that describes the torque control and vector. A novel electric vehicle drive studies based on space vector. The estimated flux magnitude and torque are then compared with their reference values. Pdf space vector modulation direct torque speed control. Principles of induction motors and simulation of direct. The simulation results that include the full dynamic model of the converter and load system validate the feed forward approach and prove that the feed forward algorithm can effectively compensate the effect of the neutral point voltage. In this paper a novel space vector pulse width modulation based control of pmsm drive using mras is presented by using matlabsimulink. A pibased speed controller supplies the torque reference. Pdf direct torque controlbased space vector pulse width. A suitable torque controller is required for this high speed induction motor. An effective direct torque control based on space vector.
Flux vector control with space vector modulation for pwm. The machine model can be described by differential equations with time, requires mutual inductance. Pdf direct torque control of induction motor drives. Pdf direct torque control of induction motor using space. 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. Pdf space vector modulation direct torque speed control of.
Sensorless vector and direct torque control monographs in. A direct induction machine torque control method based on predictive. This paper presents a novel directtorque control method for aninduction. Implementation of a direct control algorithm for induction. The feed forward method is developed for a sine triangle as well as for the space vector type pwm algorithm. The principle is based on simultaneously decoupling the. Space vector modulation direct torque speed control of induction motor article pdf available in procedia computer science 5. Direct torque control of induction machines using space vector. Dtc is a method to control machine with utilizing torque and flux of motor controlled. In conventional direct torque control dtc has, over the years, become of the most popular methods of control for induction motors im drive system.
Moreover, for spacevector pwm, there is a degree of freedom in the choice of zero vectors in one switching cycle, i. Direct torque control or dtc is the most advanced ac drive. Direct torque control of induction motor using space vector. The direct torque control scheme is characterized by the absence of pi regulators, coordinate transformations, current regulators and pulse width modulated signal generators. The speed control loop outputs the reference electromagnetic torque and stator flux of the machine.
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