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This paper presents the direct torque control of induction motor drive using matrix converters. DTC is a high performance motor control scheme with fast torque and flux responses. However, the main disadvantage of conventional DTC is electromagnetic torque ripple. In this paper, direct torque control for Induction Motors using Matrix Converters is analysed and points out the problem of the electromagnetic torque ripple which is one of the most important drawbacks of the Direct Torque Control. Besides, the matrix converter is a single-stage ac-ac power conversion device without dc-link energy storage elements. Matrix converter (MC) may become a good alternative to voltage-source inverter (VSI). This work combines the advantages of the matrix converter with those of the DTC technique, generating the required voltage vectors under unity input power factor operation. Simulation results demonstrates the effectiveness of the torque control.

The matrix converter (MC) with direct torque control (DTC) combination is efficient way to get better performance specifications in the industry. The MC and the DTC advantages are combined together. The reduction of complexity and cost of DC link in the DTC since it has no capacitors in the circuit. However, the controlling torque is a big problem it in DTC because of high ripple torque production which results in vibrations response in the operation of the iductuction motor as it has no PID to control the torque directly. To overcome this, a combination of MC with DTC is applied to reduce the fluctuation in the output torque and minimize the steady state error. This paper presents the simulation analysis of induction machine drives using Maltlab/Simulink toolbox R2012a. Design of DTC induction motor drive, MC with constant switching frequency, speed controller and stability investigation as well as controllability and observabilty with minimum final prediction (FPE) steady state error and loss functionality has been carried out precisely.

2010

The combination of indirect matrix converter with direct torque control is a way towards energy-saving of the world. This paper investigates the use of four-step switching in rectifier bridge of indirect matrix converters to reduce the electromagnetic torque ripple which appears when direct torque control technique is used in induction motors. By suitably selecting switching pattern, the electromagnetic torque ripple

2011

This paper proposes a modified fuzzy direct torque control scheme of induction motor fed by matrix converter to reduce the electromagnetic torque ripple which is one of the most important drawbacks of direct torque control. This DTC scheme based fuzzy logic regulation of the virtual DC voltage in the virtual rectifier stage output. The proposed enhanced Matrix Converter Direct Torque Converter was tested by simulation. A comparison between the classical Direct Torque Control using Matrix Converters and the proposed method is carried out. Results which demonstrate the improvement of the novel Direct Torque Control are shown.

2006 IEEE International Symposium on Industrial Electronics, 2006

In this paper, a new fuzzy space vector modulation direct torque control strategy for induction machine based on indirect matrix converter is proposed. In the rectifier stage a space vector modulation strategy is employed. In the inverter stage two fuzzy logic regulators used to replace the classical PI regulators in PWM direct torque control method. In this method, the input current is nearly sinusoidal and the input displacement angle is adjustable. Using this control strategy, the advantages of indirect matrix converter and direct torque control method are combined. The performance of the proposed drive system is evaluated through digital simulation using MATLAB-SIMULINK package and simulation results are used to verify the effectiveness of the proposed strategy and support the analytical results.

Computing Research Repository, 2010

A few papers have been interested by the fixed switching frequency direct torque control fed by direct matrix converters, where we can find just the use of direct torque controlled space vector modulated method. In this present paper, we present an improved method used for a fixed switching frequency direct torque control (DTC) using a direct matrix converter (DMC). This method is characterized by a simple structure, a fixed switching frequency which causes minimal torque ripple and a unity input power factor. Using this strategy, we combine the direct matrix converters advantages with those of direct torque control (DTC) schemes. The used technique for constant frequency is combined with the input current space vector to create the switching table of direct matrix converter (DMC). Simulation results clearly demonstrate a better dynamic and steady state performances of the proposed method.

International Journal of Engineering Research and Technology (IJERT), 2012

https://www.ijert.org/voltage-vectors-of-matrix-converters-for-torque-ripple-reduction-in-direct-torque-control-of-induction-machines https://www.ijert.org/research/voltage-vectors-of-matrix-converters-for-torque-ripple-reduction-in-direct-torque-control-of-induction-machines-IJERTV1IS7330.pdf The matrix converter is an array of controlled semiconductor switches that connects directly the three-phase source to the three-phase load. This converter has several attractive features that have been investigated in the last two decades. In the last few years, an increase in research work has been observed, bringing this topology closer to the industrial application. This paper presents the state-of-the-art view in the development of this converter, starting with a brief historical review.

Journal of Renewable and Sustainable Energy, 2017

This work aims to study, analyze, and compare two direct torque control (DTC) methods of induction machine fed by [3 Â 3] direct matrix converter (MC). The first method, DTC, uses the direct model of the matrix converter, whereas the second method, direct torque control indirect (DTCI), uses its indirect model, which describes MC as a combination of a four-quadrant rectifier with a two-level inverter. The two methods are simulated with the same parameters and references of speed and flux. An experimental validation is performed on a prototype of a [3 Â 3] direct matrix converter realized in the laboratory, which feeds a three-phase induction machine coupled with a brake. These tests allowed us to demonstrate the practical feasibility of these control schemes. The algorithms are implemented on a dSPACE 1104 controller board. The input power factor is fixed to 1. A comparison between the two algorithms results based on several criteria (power quality, static and dynamic performance of the system, and maintenance of the unity power factor) is presented, and the results are discussed. Published by AIP Publishing.

2017 20th International Conference on Electrical Machines and Systems (ICEMS), 2017

The direct matrix converter has been regarded as a promising AC/AC conversion topology and it is being researched. Motor drives are one of the main potential applications of the matrix converter. This paper carries forward the application of matrix converters in AC motor drives using direct torque control (DTC). In the common DTC scheme for the matrix converter, two vectors with the maximum amplitudes are used to control the torque and flux. In the proposed approach, the input voltage vector sectors are redefined, therefore a modified and simplified switching look-up table is obtained. In this case the most appropriate vector to be applied is uniquely determined and the number of switch actions are reduced. The excellent dynamic performance is obtained by selecting the maximum vector. Flux and speed are controlled effectively. Simulation work is carried out for an induction motor and results verify the effectiveness of the proposed DTC control in matrix converter based AC drive systems.

IEEE Transactions on Industry Applications, 2006

This paper presents the implementation of a highperformance direct torque control (DTC) of induction machines drive. DTC has two major problems, namely, high torque ripple and variable switching frequency. In order to solve these problems, this paper proposed a pair of torque and flux controllers to replace the hysteresis-based controllers. The design of these controllers is fully discussed and a set of numerical values of the parameters for the proposed controllers is given. The simulation of the proposed controllers applied to the DTC drive is presented. The simulation results are then verified by experimental results. The hardware implementation is mainly constructed by using DSP TMS320C31 and Altera field-programmable gate array devices. The results prove that a significant torque and stator flux ripples reduction is achieved. Likewise, the switching frequency is fixed at 10.4 kHz and a more sinusoidal phase current is obtained.