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GDPWM Algorithm for Direct Torque Controlled Induction Motor Drive Using the Concept of Imaginary Switching Times K. Sri Gowri1, T.Brahmananda Reddy2, Ch. Sai Babu3 1Department of Electrical Engineering, RGMCET, Nandyal 2Department of Electrical Engineering, G.Pulla Reddy Engineering College, Kurnool 3Department of Electrical Engineering J.N.T.U, Anantapur Andhra Pradesh, India.Abstract This paper presents a space vector based Generalized Discontinuous Pulsewidth Modulation (GDPWM) algorithm applied to direct torque control (DTC) of induction motor drive without angle estimation using the concept of imaginary switching times. The proposed GDPWM based DTC retains all the advantages of conventional DTC (CDTC) moreover eliminates the complexity involved in conventional space vector Pulsewidth modulation (CSVPWM) algorithm. The proposed method results in reduced current ripple over CSVPWM based DTC at higher modulation indices and low switching losses at all modulation indices. To validate the proposed method, simulation is done in MATLAB/SIMULINK environment and the results of some popular discontinuous PWM (DPWM) based DTC are presented. Also, comparison of the total harmonic distortion (THD) in line current between the CDTC and different DPWM based DTC is made. The proposed algorithm over and above enhancing the performance at high modulation indices, switching losses of the inverter and computational burden involved in conventional GDPWM algorithm are reduced significantly. Keywords: DTC, CSVPWM, DPWM, GDPWM Imaginary switching times. (
@ARTICLE{P1110846475,
AUTHOR = {K. Sri Gowri and T.Brahmananda Reddy and Ch. Sai Babu},
TITLE = {GDPWM Algorithm for Direct Torque Controlled Induction Motor Drive Using the Concept of Imaginary Switching Times}, JOURNAL = {ICGST International Journal on Automatic Control and Systems Engineering, ACSE}, YEAR = {2008}, VOLUME = {08}, ISSUE = {III}, PAGES={37-- 44} } ( |
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