A Space Phasor Based Current Hysteresis Controller Using Adjacent Inverter Voltage Vectors with Smooth Transition to Six Step Operation for a Three Phase Voltage Source Inverter

Abstract

In this paper, a space phasor based current hysteresis controller for a three-phase voltage source inverter is proposed. The current errors are determined along three axes, which are orthogonal to the A, B, C phases, and the current error space phasor is held within a hexagonal boundary. The proposed controller does not require any computation of machine voltage vector and uses only those inverter voltage vectors, which are adjacent to the machine voltage vector for the entire range of operation. The region detection logic employed in the proposed controller ensures that, the vector (among the three adjacent vectors), which has the largest deviation in the opposite direction, is selected, for all the regions of the hexagonal boundary. A simple self-adapting logic is used to effect sector changes and smooth transition to six-step mode of operation is achieved. The proposed controller is implemented for a 5hp induction motor drive.

Key Words:

• Current controlled inverter
• Space phasor based hysteresis controller

Additional information

Notes on contributors

M. R. Baiju

M. R. Baiju received his B.Tech degree in Electronics and Communication Engineering from College of Engineering, Trivandrum in 1988 and M.Tech. and Ph.D from CEDT, Indian Institute of Science in 1997 and 2004, respectively. From 1988 to 1991 he was with the National Thermal Power Corporation Ltd., New Delhi and since 1991 he has been a faculty at College of Engineering, Trivandrum.

K. K. Mohapatra

Krishna K. Mohapatra received the B.E. degree from R.E.C. Rourkela, India and M.Tech degree from Indian Institute of Technology, Kharagpur in 1993 and 1996, both in Electrical Engineering. He was a design and development engineer in National Radio and Electronics Company Ltd., from 1995 to 2000. He obtained his Ph.D degree in 2003, from the Centre for Electronics design and Technology, Indian Institute of Science, Bangalore, India. His research interests are in the area of Power converters, PWM strategies and Motor Drives. He is currently pursuing postdoctoral fellowship at University of Minnesota, USA.

R. S. Kanchan

R. S. Kanchan received the B.E. degree in electrical engineering from the Walchand College of Engineering, Sangli, India, in 1998, the M. Tech. degree in electrical engineering from the Indian Institute of Technology, Bombay, India in 2000, and is currently pursuing the Ph. D. degree at the Centre for Electronic Design and Technology (CEDT), Indian Institute of Science, Bangalore, India. He was with Tata Steel Company from 2000 to 2002.

P. N. Tekwani

P. N. Tekwani received his B.E. degree in power electronics from the Lakhdhirji Engineering College, Morbi, India, in 1995, the M.E. degree in electrical engineering from the Maharaja Sayajirao University, Vadodara, India, in 2000, and is currently pursuing the Ph. D. degree at the Centre for Electronic Design and Technology (CEDT), Indian Institute of Science, Bangalore, India. From 1996 to 2001, he was with Electrical Research and Development Association (ERDA), Vadodara, India, and since 2001 he has been a Member of the Faculty at the Nirma Institute of Technology, Ahmedabad, India

K. Gopakumar

K. Gopakumar received his B.E., M.Sc.(Engg.) and Ph.D. degrees from Indian Institute of Science in 1980, 1984 and 1994 respectively. He was with the Indian Space Research organization from 1984 to 1987. He is currently Associate Professor at CEDT(centre for Electronics Design and Technology), Indian Institute of Science, Bangalore-560012, India. His fields of interest are Power Converters, PWM Techniques and AC Drives.