Auto Transformer Connected 24 Pulse AC-DC Converter for Vector Controlled Induction Motor Drive: A Matlab Simulation
Brijesh Kumar1, Niraj Kumar Shukla2, Sunil Kumar Sinha3, Ajay Shekhar Pandey4

1Brijesh Kumar, Department of Electrical Engineering, KNIT Sultanpur, (U.P), India.
2Niraj Kumar Shukla, Department of Electronics & Communication Engineering, University of Allahabad (U.P), India.
3Dr. Sunil Kumar Sinha, Department of Electrical Engineering, KNIT Sultanpur (U.P), India.
4Dr. Ajay Shekhar Pandey, Department of Electrical Engineering, KNIT Sultanpur (U.P), India.
Manuscript received on 05 February 2019 | Revised Manuscript received on 13 February 2019 | Manuscript published on 28 February 2019 | PP: 424-429 | Volume-8 Issue-4, February 2019 | Retrieval Number: D2689028419/19©BEIESP
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Abstract: This paper deals with the steady state performance analysis of an autotransformer based 24- pulse ac-dc converter feeding variable frequency vector controlled squirrel cage induction motor drives at different mechanical load and constant reference speed. These variable frequency induction motor drives are generally operated in vector controlled mode due to their inherent advantages. There are three new elements which are added in the proposed model, first is three single phase autotransformers for phase shifting of 3-phase supply, second one is 24-pulse converter to eliminate the harmonics injected to the source and third one is interphase transformers to ensure the independent operation of the rectifier circuits. The feedback closed loop control system is used to control the speed of the induction motor, which has highly nonlinear torque-speed characteristics. This simulation is done to analyse the parameters of ac electric drive in terms of settling time, steady state error and overshoot. The simulation results show that the speed control performance reduces the steady state error and maximum overshoot under different load conditions.
Keyword: Vector Controlled Induction Motor, PWM Inverter, Autotransformer, Interphase Transformers, FOC.
Scope of the Article: Digital Clone or Simulation