Modified Switching Table-Based Direct Torque Control of Six-Phase Induction Motor Drive

Abstract

This paper presents “Switching Table based Direct Torque Control” of Six-Phase Induction Motor (SPIM) Drive. The SPIM consists of two sets of stator windings spatially shifted by an angle of 30°. The extension of DTC technique of three-phase induction motor for a six-phase induction motor yields conventional DTC, in which one large voltage vector per sampling period is utilized. This technique suffers from large stator current harmonics of the order of 6k ± 1 (k = 1, 3, 5..). Initially, the conventional DTC technique has been implemented for comparison purpose. Further, its performance is improved by using two voltage vectors in each sampling period. In order to investigate the performance of ST-DTC based SPIM, a simulation study is carried out under different operating conditions. To validate the simulation results, a prototype model of six-phase induction motor rated for 1.5 kW, 200 V, 50 Hz is developed. Results obtained during simulation and experimentation show the effectiveness of modified ST-DTC technique in the reduction of stator current harmonics.

Keywords:

• harmonic currents
• switching table-based direct torque control (ST-DTC)
• six-phase induction motor (SPIM)
• six-lag two-level voltage source inverter
• torque ripple

Additional information

Notes on contributors

Suhel A Shaikh Mo

Mo. Suhel Shaikh received the B.E. in Electrical Engineering from Veer Narmad South Gujarat University, Surat, Gujarat in 2006 and M.Tech in Industrial Electronics from Sardar Vallabhbhai National Institute of Technology Surat, Gujarat, India, in 2010, where he is currently working toward the Ph.D degree in the Electrical Engineering. He is currently working as an assistant professor in the electrical engineering department, at Sarvajanik College of Engg. And Tech., Surat, Gujarat, India. His research interests include multiphase induction motor, and power electronics converter for drives application.

Rakesh Maurya

Rakesh Maurya received the B. Tech. degree in electrical engineering from the Kamla Nehru Institute of Technology, Sultanpur, India, in 1998, and the M. Tech. degree in power electronics and electric drive and the Ph. D. degree in electrical engineering from the Indian Institute of Technology Roorkee, Roorkee, India, in 2002 and 2014, respectively. He is currently a Faculty Member with the Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, India. His research interests include design of switching power converters, high power factor AC/DC converters, hybrid output converters, improved power quality converters for battery charging applications, power quality problems, advanced electric drives and applications of real-time simulator for the control of power converters.

Nitin Gupta

Nitin Gupta graduated in Electrical Engineering from Government Engineering College Kota, in 2000. He did his Master of Engineering in Power Electronics in 2008 from College of Technology and Engineering (CTAE), Udaipur and Ph.D. degree in Electrical Engineering from Indian Institute of Technology (IIT) Roorkee, Roorkee as full-time research scholar under MHRD in 2012. Presently, he is Assistant Professor in the Department of Electrical Engineering, Malaviya National Institute of Technology (MNIT), Jaipur. His areas of interest are power electronics & drives, power quality, renewable energy grid integration, active power filters, multilevel inverters etc.