| Paper Details: | Downloads: 745 |
| Serial Number: | P1110944908
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| Title: | Simplified Hybrid PWM Algorithm for Vector Controlled Induction Motor Drive without Angle Estimation for Reduced Current Ripple
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| Authors: | N. Ravisankar Reddy and T. Brahmananda Reddy and J. Amarnath and D. Subba Rayudu
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| Abstract: | Conventional space vector pulsewidth modulation (CSVPWM) employs conventional switching sequence (0127-7210), which divides the zero vector time equally between the two zero states in every subcycle. To modulate the required voltage vector it needs magnitude and angle and hence complexity involved in conventional SVPWM algorithm is more. In the proposed hybrid pulsewidth modulation (HPWM) algorithm, the effective time is determined using the concept of imaginary times in order to avoid the requirement of angle and sector identification. The proposed HPWM algorithm is developed based on the notion of stator flux ripple, which can be used for a measure of ripple in line current. Expressions for RMS ripple, over a subcycle are derived for each switching sequence in terms of reference voltage vector, imaginary switching times. The proposed HPWM algorithm is developed using RMS flux ripple characteristics which are graphically illustrated. The proposed algorithm results in reduced harmonic distortion at all modulation indices. To validate the proposed method, simulation has been carried out on vector controlled induction motor drive using MATLAB/SIMULINK and the results are presented and compared.
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| Keywords: | conventional SVPWM, discontinuous PWM, Imaginary switching times, stator flux ripple, THD, vector control
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| Journal/Conference: | International Journal of Automatic Control and System Engineering
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| Volume: | 9
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| Issue: | 3
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| Submission Date: | 10/30/2009 12:00:00 AM
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| Review Date: | 12/7/2009 12:00:00 AM
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| Publishing Date: | 12/16/2009 12:00:00 AM
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| Article Downloads: | 745
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