DIRECT TORQUE CONTROL USING THREE LEVEL INVERTERS OF INDUCTION MOTOR
DESIGN DETAILS
The direct torque control (DTC) method has emerged as an alternative to Field Oriented Control (FOC) method for high performance ac drives. The merits of DTC are fast torque response, simple structure (no need of complicated coordinate transformation, current regulation or modulation block), and robustness against motor parameter variation. The direct torque control is one of the most strategies applied to improve certain aspect of Induction Motor (IM) as reducing the distortion of the flux and to have good dynamic performance. This kind of technique is based on the direct control of the stator vector flux and the electromagnetic torque. One of the characteristics of the DTC method is the table of localisation that helps to determent the vector voltage which depends on the position of the stator flux and electromagnetic torque. This method is quite simple and allows decoupled control to flux and torque without resorting to use the technique of width modulation and pulse current regulators. Such of command involves nonlinear correctors of hysteresis type that introduce limitations at large switching and non-controllable frequency.
This Matlab/Simulink design is based on DTC applied to an induction motor fed three level voltage inverters, and to demonstrate the great advantages of using three-level inverters. The torque reference value is deduced from the regulation of the IM speed using a PI corrector. Matlab simulation using 2020a version present the results corresponding to the rotation speed evolution, the electromagnetic torque, the flux evolution in the αβ subspace and the stator currents.
REFERENCES
Reference Paper: Comparison between DTC using a two-level inverters and DTC using three level inverters of Induction Motor
Author’s Name: Lahcen Ouboubker, Mohamed Khafallah, and Khalid Chikh
Source: IEEE
Year:2014
DOWNLOAD the Matlab code from the below URL, and specify the Website URL or Title of the design.
https://drive.google.com/file/d/1Z8o5X-N1C1wEpLen5PJYXO1_ehUJXEe3/view?usp=sharing
SIMULATION VIDEO DEMO
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