SVPWM based DTC of Three Level Voltage fed Open End Winding Induction Motor
G.Satheesh1, T. Bramhananda Reddy2, Ch. Sai Babu3

1G. Satheesh, Department of EEE, G.P.R.E.C., Kurnool (Andhra Pradesh), India.
2Dr. T. Bramhananda Reddy, Department of EEE, G.P.R.E.C., Kurnool (Andhra Pradesh) India.
3Dr. CH. Sai Babu, Department of Electrical Engineering, J. N. T. U., Kakinada (Andhra Pradesh), India.
Manuscript received on 18 November 2012 | Revised Manuscript received on 25 November 2012 | Manuscript published on 30 November 2012 | PP: 40-47 | Volume-1 Issue-5, November 2012 | Retrieval Number: E0341101512/2012©BEIESP
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Abstract: A Space Vector Pulse Width Modulation (SVPWM) based Direct Torque Control (DTC) of Dual Inverter Fed Open End Winding Induction Motor is analyzed in this paper. A SVPWM based, 3 level phase voltages are generated with two individual two level inverters. In this method, first inverter pulses are generated normally and second inverter pulses are generated with 180 degrees phase shift. But at a particular state of switching first inverter is switched in all states and second inverter is clamped to that active state. In the next state of switching the second inverter is switched in all states and first inverter is clamped to corresponding active state. One inverter output is superimposed on the other inverter, resulting a 3-level line voltage waveform for the induction motor. The imaginary switching time concept is used in the proposed method. It does not require any procedures for calculation of regions in space voltage vector and angle calculations sector identification. The imaginary switching time greatly reduces the complexity of the algorithm. Simulation studies have been carried out for the proposed scheme and results are presented.
Keywords: DTC, Dual Inverter, NSHC Algorithm, OEWIM, SVPWM.

Scope of the Article: Algorithm Engineering