scholarly journals Improved Direct Torque Control Based on Neural Network of the Double-Star Induction Machine Using Deferent Multilevel Inverter

2020 ◽  
Author(s):  
Mohamed Haithem Lazreg ◽  
Abderrahim Bentaallah
Keyword(s):  
Neural Network ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Double Star ◽  
Torque Control ◽  
Switching Frequency ◽  
Simulation Results ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

In this chapter, we will compare the performance of a multilevel direct torque control (DTC) control for the double-star induction machine (DSIM) based on artificial neural network (ANN). The application of DTC control brings a very interesting solution to the problems of robustness and dynamics. However, this control has some disadvantages such as variable switching frequency, size, and complexity of the switching tables and the strong ripple torque. A solution to this problem is to increase the output voltage level of the inverter and associate the DTC control with modern control techniques such as artificial neural networks. Theoretical elements and simulation results are presented and discussed. As results, the flux and torque ripple of the five-level DTC-ANN control significantly reduces compared to the flux and torque ripple of the three-level DTC-ANN control. By viewing the simulation results using MATLAB/Simulink for both controls, the results obtained showed a very satisfactory behavior of this machine.

Improved Torque Control Performance in Direct Torque Control using Optimal Switching Vectors

2015 ◽  
Vol 5 (3) ◽  
pp. 441 ◽  
Author(s):  
Muhd Zharif Rifqi Zuber Ahmadi ◽  
Auzani Jidin ◽  
Maaspaliza Azri ◽  
Khairi Rahim ◽  
Tole Sutikno
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Torque Control ◽  
Multilevel Inverter ◽  
Switching Frequency ◽  
Optimal Switching ◽  
Steady State Condition ◽  
Selection Of

This paper presents the significant improvement of Direct Torque Control (DTC) of 3-phases induction machine using a Cascaded H-Bidge Multilevel Inverter (CHMI). The largest torque ripple and variable switching frequency are known as the major problem founded in DTC of induction motor. As a result, it can diminish the performance induction motor control. Therefore, the conventional 2-level inverter has been replaced with CHMI the in order to increase the performance of the motor either in dynamic or steady-state condition. By using the multilevel inverter, it can produce a more selection of the voltage vectors. Besides that, it can minimize the torque ripple output as well as increase the efficiency by reducing the switching frequency of the inverter. The simulation model of the proposed method has been developed and tested by using Matlab software. Its improvements were also verified via experimental results.

Direct Torque Control Using Fuzzy and Neural as Switching Vector Selector for Doubly Fed IM

2013 ◽  
Vol 646 ◽  
pp. 134-138
Author(s):  
Fethia Hamidia ◽  
Abdelakader Larabi ◽  
Mohamed Seghir Boucherit
Keyword(s):  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
Load Torque ◽  
Control Approach ◽  
High Torque ◽  
Simulation Results ◽  
Low Torque ◽  
Doubly Fed

The conventional Direct Torque Control approach has some drawbacks such as high torque ripple and switching frequency, which is varying with speed, load torque and the selected hysteresis bands, this paper discuss the application of neural network and fuzzy logic on DTC of Doubly fed induction motor DFIM, the proposed techniques having the advantages of low torque and flux ripples. Simulation results emphasize the good performance of the fuzzy and neural techniques.

scholarly journals High –Performance using Neural Networks in Direct Torque Control for Asynchronous Machine

2018 ◽  
Vol 8 (2) ◽  
pp. 1010
Author(s):  
Zineb Mekrini ◽  
Seddik Bri
Keyword(s):  
Neural Networks ◽  
High Performance ◽  
Dynamic Performance ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Numerical Procedure ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
Asynchronous Machine

<p><span>This article investigates solution for the biggest problem of the Direct Torque Control on the asynchronous machine to have the high dynamic performance with very simple hysteresis control scheme. The Conventional Direct Torque Control (CDTC) suffers from some drawbacks such as high current, flux and torque ripple, as well as flux control at very low speed. In this paper, we propose an intelligent approach to improve the direct torque control of induction machine which is an artificial neural networks control. The principle, the numerical procedure and the performances of this method are presented.  Simulations results show that the proposed ANN-DTC strategy effectively reduces the torque and flux ripples at low switching frequency, compared with Fuzzy Logic DTC and The Conventional DTC.</span></p>

A Review on Constant Switching Frequency Techniques for Direct Torque Control of Induction Motor

2017 ◽  
Vol 7 (2) ◽  
pp. 364
Author(s):  
Auzani Jidin ◽  
Kasrul Abdul Karim ◽  
Khairi Rahim ◽  
Logan Raj Lourdes Victor Raj ◽  
Sundram Ramahlingam ◽  
...  
Keyword(s):  
Induction Motor ◽  
Dynamic Control ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
High Switching Frequency ◽  
The Common ◽  
Very High

The Direct Torque Control (DTC) of induction machine has received wide acceptance in many Variable Speed Drive (VSD) applications due to its simple control structure and excellent torque dynamic control performances. However, the conventional DTC which employs a two-level inverter and hysteresis controllers produces two major drawbacks, namely, larger torque ripple and variable switching frequency, which might produce a very high switching frequency (or power loss), particularly at a very low speed operation. This paper highlight the common methods used to provide the constant switching frequency for DTC drives for Induction Motor that able to minimize the power losses and reduced the torque ripple.

Improvise 3-Level DTC of Induction Machine using Constant Switching Frequency Method by Utilizing Multiband Carrier

2016 ◽  
Vol 7 (3) ◽  
pp. 638
Author(s):  
Sundram A/l Ramahlingam ◽  
Auzani Bin Jidin ◽  
Tole Sutikno ◽  
L. Logan Raj
Keyword(s):  
Control Structure ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Parameter Tuning ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
Frequency Method ◽  
Output Torque ◽  
Switching Method

This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple. The major factorthat contributes to these problems the usage of hysteresis based comparators to control the output torque. The implementation of PI based constant switching method in DTC able to solve these problems while retaining the simple control structure of conventional DTC. The combination usage of 3-level CHMI in this system can further minimize the output torque ripple by providing greater number of vectors. This paper presents detail explanation and calculationof optimal PI parameter tuning strategyconsecutively to enhance the performance of 3-level DTC system. In order to validate the feasibility, the proposed method compared with convention DTC system via simulation and experiment results.

Enhanced Torque Control and Reduced Switching Frequency in Direct Torque Control Utilizing Optimal Switching Strategy for Dual-Inverter Supplied Drive

2016 ◽  
Vol 7 (2) ◽  
pp. 328
Author(s):  
M. Khairi Rahim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Power Loss ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Rate Of Change ◽  
Operating Conditions ◽  
Torque Control ◽  
Switching Frequency ◽  
Optimal Switching ◽  
Switching Strategy

Direct Torque Control (DTC) of induction machine has received wide acceptance in many adjustable speed drive applications due to its simplicity and high performance torque control. However, the DTC using a common two-level inverter poses two major problems such as higher switching frequency (or power loss) and larger torque ripple. These problems are due to inappropriate voltage vectors which are selected among a limited number of voltage vectors available in two-level inverter. The proposed research aims to formulate an optimal switching strategy using Dual-Inverter Supplied Drive for high performances of DTC. By using dual-inverter supplied, it provides greater number of voltage vectors which can offer more options to select the most appropriate voltage vectors. The most appropriate voltage vectors should able to produce minimum torque slope but sufficient to satisfy torque demands. The identification is accomplished by using an equation of rate of change of torque which is derived from the induction machine equations. The proposed strategy also introduces a block of modification of torque error status which is responsible to modify the status such that it can determine the most optimal voltage vectors from a look-up table, according to motor operating conditions. The improvements obtained are as follows; 1) minimization of switching frequency (reduce power loss), and 2) reduction of torque ripple. Some improvements obtained in the proposed strategy were verified via experimentations.

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