Power Quality Improvement in Switched Mode Power Supplies Using Autoconnected Transformer Based 9-Phase ac-dc Converters

Abstract

Switched Mode Power Supplies (SMPS) of medium power ratings are extensively used in heating, welding and telecommunication power supply applications. Invariably, they use a 3-phase ac-dc converter at the front end. In this paper, different autoconnected transformer-based 9-phase ac-dc converter configurations are designed, modeled and simulated to feed such medium capacity SMPS for improving the power quality indices at the point of common coupling (PCC). The autoconnected transformer is designed suitable for producing 9-phase voltages of same magnitude and having equal phase shift. The proposed 9-phase ac-dc converters are found capable of suppressing up to 17th harmonic in the supply current along with the power factor improvement close to unity at varying loads. A set of power quality indices on input ac mains and magnetic ratings for various autoconnected transformer configurations for this SMPS are also presented so that the best converter configuration can be chosen according to the requirements for a particular application.

Keywords:

• Autoconnected transformer
• Multiphase ac-dc converter
• Power quality improvement
• Switched Mode Power Supplies

Additional information

Notes on contributors

R. Kalpana

R. Kalpana received the B.E degree in electrical and electronics engineering from Bharath Institute of Science and Technology, Chennai, in 1998 and M.E in Power Systems from Anna University, Chennai, in 2000. She is currently working for Ph.D Degree at the Department of Electrical Engineering, IIT-Delhi, India. Her area of interest includes power systems, power electronics, FACTS and power conditioning. E-mail: [email protected]

G. Bhuvaneswari

G. Bhuvaneswari received the B. Tech. degree in electrical engineering from the College of Engineering Madras, India, in 1977 and the M. Tech. and Ph.D. degrees from the Indian Institute of Technology (IIT), Madras, India, in 1988 and 1992, respectively. In 1997, she was an Assistant Professor and became Associate Professor in 2006 in the Department of Electrical Engineering, IIT Delhi, New Delhi, India. Her field of interest includes power electronics, electrical machines and drives, active filters, and power conditioning. Dr. Bhuvaneswari is a Fellow of the Institution of Electronics and Telecommunication Engineers (IETE). E-mail: [email protected]

Bhim Singh

Bhim Singh received the B.E. degree in electrical engineering from the University of Roorkee, Roorkee, India, in 1977, and the M. Tech. and Ph.D. degrees in electrical engineering from the Indian Institute of Technology (IIT)-Delhi, New Delhi, India, in 1979 and 1983, respectively.

In 1983, he joined the Department of Electrical Engineering, University of Roorkee, as a Lecturer, and in 1988, became a Reader. In December 1990, he joined the Department of Electrical Engineering, IIT-Delhi, as an Assistant Professor and became an Associate Professor in 1994 and a Professor in 1997. He has received Khosla Research Prize of University of Roorkee in the year 1991. He is recipient of JC Bose and Bimal K Bose awards of The Institution of Electronics and Telecommunication Engineers (IETE) for his contribution in the field of Power Electronics in the year 2000. He is also a recipient of Maharashtra State National Award of Indian Society for Technical Education (ISTE) in recognition of his outstanding research work in the area of Power Quality in the year 2006. He has received PES Delhi Chapter Outstanding Engineer Award for the year 2006. He has been the General Chair of the IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES’2006) held in New Delhi. His current research interests include power electronics, electrical machines and drives, active filters, flexible ac transmission system (FACTS), high-voltage dc (HVDC), and power quality.

Dr. Singh is a Fellow of the Indian National Academy of Engineering (INAE), the National Academy of Science, India (NASI), the Institution of Engineers (India) (IE (I)), and the Institution of Electronics and Telecommunication Engineers (IETE). He is a Life Member of the Indian Society for Technical Education (ISTE), the System Society of India (SSI) and the National Institution of Quality and Reliability (NIQR) and a fellow of the institute of electrical and electronics engineering (IEEE). E-mail: [email protected]