scholarly journals Novel DTC induction machine drive improvement using controlled rectifier for DC voltage tuning

2019 ◽  
Vol 10 (3) ◽  
pp. 1223
Author(s):  
Nour Mohamed ◽  
Tedjini Hamza ◽  
Gasbaoui Brahim
Keyword(s):  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Control ◽  
Voltage Source ◽  
Voltage Vector ◽  
Torque Control Strategy ◽  
Torque Response ◽  
Induction Machine Drives ◽  
The Difference ◽  
Machine Drives

<span lang="EN-US">The application of the direct torque control strategy for induction machine drives is mainly characterized by torque and flux distortions caused by voltage vector limitation. The goal of this paper is to perform the conventional DTC induction machine drives and reduce ripples of both flux and torque response. The proposed contribution is based on the control of the DC output side of the rectifier feeding the voltage source inverter by means of PI controller in order to adapt the voltage vector used in typical DTC switching table. Mathematic models are built using MATLAB Simulink and programming environment; the simulation results show the difference between the proposed method and classical DTC.</span>

Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine

2017 ◽  
Vol 8 (2) ◽  
pp. 522
Author(s):  
Goh Wee Yen ◽  
Nik Rumzi Nik Idris ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Direct Torque Control ◽  
Induction Machine ◽  
Drive System ◽  
Torque Control ◽  
Duty Ratio ◽  
Activation Time ◽  
Light Load ◽  
Look Up Table ◽  
Voltage Vector ◽  
Torque Response

Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.

scholarly journals A Novel Finite-Control-Set Model Predictive Directive Torque Control Strategy of Permanent Magnet Synchronous Motor with Extended Output

Electronics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 388 ◽  
Author(s):  
Mingxing Du ◽  
Ye Tian ◽  
Wenbai Wang ◽  
Ziwei Ouyang ◽  
Kexin Wei
Keyword(s):  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Voltage Vector ◽  
Torque Control Strategy ◽  
Finite Control ◽  
Control Set ◽  
Verification Test ◽  
Torque Ripples

The performance of conventional direct torque control strategy from the viewpoint of flux and torque ripples has been unsatisfactory. Therefore, this study aims to propose a novel finite-control-set model predictive direct torque control strategy with extended output based on two-step prediction. An appropriate pre-selected vector, which is modulated in a specific manner, is selected through a look-up table and then used to optimise the pre-selected voltage vector based on the computing result from the model prediction and output it. The proposed strategy extends the range of the vectors that can be used to enhance the flux and torque control performance and reduce ripples and computational complexity in comparison with the conventional finite-control-set model predictive direct torque control. The feasibility of the proposed method is verified by conducting a verification test using dSPACE and Tyhpoon HIL 402 experimental platform.

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