A Multilevel Inverter fed Direct Torque Control Strategy for an Induction Motor using PI Controllers
Vinod B. R.1, Shiny G.2
1Vinod B. R., Department of Electronics and Communication Engineering, College of Engineering Trivandrum, Thiruvananthapuram, (Kerala), India.
2Shiny G., Department of Electronics and Communication Engineering, College of Engineering Trivandrum, Thiruvananthapuram (Kerala), India.
Manuscript received on 18 April 2018 | Revised Manuscript received on 27 April 2018 | Manuscript published on 30 April 2018 | PP: 90-99 | Volume-7 Issue-4, April 2018 | Retrieval Number: D5357047418/18©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This paper presents a multilevel inverter fed direct torque control scheme for an open-end winding configured induction motor drive. Unlike the hysteresis controller based direct torque control strategy, the control scheme comprising of the torque and flux control by rotating reference frame quadrature-axis and direct-axis voltage components respectively. Here, Proportional Integral controllers are used for the generation of these voltage components. In the modulation part, a fractal based space vector direct torque control algorithm is used for sector identification and determination of associated switching vectors. Moreover, the algorithm incorporates a computationally efficient 600 coordinate system for representing the space vectors instead of the conventional Cartesian coordinate system. The speed reversal, steady-state and dynamic performance of the scheme is thoroughly analyzed under loading conditions. The multilevel inverter drive is implemented on an open-end winding type induction motor. A six level inverter fed direct torque controlled drive was designed and implemented by using a 2 Hp induction motor. The loading performance of the scheme is tested on a mechanical load with a 5Hp induction motor. All the experimental waveforms were captured under closed loop mode and the results are presented to validate the scheme.
Keywords: Direct Torque Control; Induction Motor; Loading; Six Level Inverter; Space Vector
Scope of the Article: Control and Automation