ICGST- ACSE Journal

ACSE
Volume (6), Issue (4) ICGST
 
Direct Torque Control of Induction Motor Based on Hybrid PWM Method for Reduced Ripple: A Sliding Mode Control Approach

T. Brahmananda Reddy, J. Amarnath and D. Subba Rayudu
E.E.E Department, G. Pulla Reddy Engineering College
Department of Electrical Engineering, JNTU
Andhra Pradesh, India.

Abstract:

The basic direct torque control has more torque, flux and current ripples in steady state, which results in acoustical noise and incorrect speed estimations. The main objective of this paper is to present a space vector based hybrid pulsewidth modulation (HPWM) method for direct torque controlled induction motor drive to reduce the steady state ripples. The proposed HPWM method is developed based on notion of stator flux ripple, which can be used for a measure of ripple in the line current. Expressions for mean square flux ripple, over a subcycle are derived for each switching sequence and this analysis together with the total harmonic distortion (THD) performance of each sequence is used to develop the HPWM method for induction motor drives. The proposed PWM method improves the performance of the drive in terms of ripple at all modulation indices. To improve the speed performance of the drive against uncertainties caused by load disturbances, an integral switching surface sliding mode speed controller is proposed. To validate the proposed method, simulation results are presented..

Keywords:  DTC, stator flux ripple, HPWM, sliding mode control.

(Full Paper, 646 KB)

Biographies:

T. Brahmananda Reddy, was born in 1979. He graduated from Sri Krishna Devaraya University, Anantapur in the year 2001. He received M.E degree from Osmania University, Hyderabad, India in the year 2003. He is presently Assistant Professor in the Electrical and Electronics Engineering Department, G. Pulla Reddy Engineering College, Kurnool, India. He presented more than 20 research papers in various national and international conferences. His research areas include PWM techniques, DC to AC converters and electrical drives.

                                  

 

D. Subba Rayudu, received B.E degree in Electrical Engineering from S.V. University, Tirupati, India in 1960, M.Sc (Engg) degree from Madras University in 1962 and Ph.D degree from Indian Institute of Technology, Madras, India in 1977. He is at present working as professor in Department of Electrical Engineering at G. Pulla Reddy Engineering College, Kurnool, India. He presented more than 30 research
papers in various national and international conferences and journals. His research interests include Electrical machines, Power Electronics and Electrical drives.

 J. Amarnath, graduated from Osmania University in the year 1982, M.E from Andhra University in the year 1984 and Ph.D from J.N.T. University, Hyderabad in the year 2001. He is presently Professor and Head of the Electrical and Electronics Engineering Department, JNTU College of Engineering, Hyderabad, India. He presented more than 60 research papers in various national and international conferences and journals. His research areas include Gas Insulated Substations, High Voltage Engineering, Power Systems and Electrical Drives.

BibTex:

@ARTICLE{P1110644003,
 
AUTHOR = {T. Brahmananda Reddy and J. Amarnath and D. Subbarayudu },

TITLE = {Direct Torque Control of Induction Motor Based on Hybrid PWM Method for Reduced Ripple: A Sliding Mode Control Approach},

JOURNAL = {ICGST International Journal on Automatic Control and Systems Engineering, ACSE},

YEAR = {2006},

VOLUME = {06},

ISSUE = {IV},

PAGES={23--30}

}

(Full Paper, 646 KB)