Abstract:

Majority of industrial drives use electric motors, since they are controllable and readily available. In practice, most of these drives are based on ac induction motor because these motors are rugged, reliable, and relatively inexpensive. The proposed technique of single phase to three phase conversion has a wide range of applications in rural areas and also in industries where three phase equipment or motors are to be operated from the easily available single phase supply. These converters are excellent choice for situations where three phase power supply is not available. The added advantage is that the three phase motor is more efficient and economical than the single phase motor. Also the starting current in three phase motor is less severe than in single phase motor. This needs a strong, efficient cost effective and high quality single phase to three phase conversion. Advanced PWM techniques are employed to guarantee high quality output voltage with reduced harmonics and sinusoidal input current irrespective of the load. To obtain sinusoidal input current at the terminal of single phase source a high performance active input power factor correction technique for single phase boost switch mode rectifier operating with discontinuous current conduction is used. The operation is based on variable turn-on time. Equal Area Criteria (EAC) is applied to the discontinuous current operation. To obtain high quality output voltage, double edge modulated sine wave PWM technique is implemented for three phase inverter. From experimental results obtained on a laboratory prototype it can be concluded that input power factor remains nearly unity for any variations in the load or speed. Thus three phase ac drives using single phase supply with improved power factor is an approach to implement high frequency induction boosting along with the three phase PWM inverter for controlling the speed of three phase induction motor by maintaining v/f ratio at constant value. This scheme can be used in lathe machines, small cranes, lifts etc, which are frequently switched ON and OFF.                                                                          

Keywords: power factor correction, boost-converter, equal area criterion, Power MOSFET, PWM inverter, v/f ratio, FCT, RCT, VCT, OCT.

(Full Paper , 498 KB)

Biographies:

Pradeep Mitharam Patil, was born in Bhusawal, District Jalgaon, Maharashtra, India on December 13, 1966. He received B. E. (Electronics) degree in 1988 from Amravati University, Amravati, India and M. E. (Electronics) degree in 1992 from Marathwada University, Aurangabad, India. From 1988 to 2002 he worked as Lecturer and Assistant Professor in Electronics department at various engineering colleges in Pune University, India. He received the Ph.D. degree in Electronics and Computer Engineering in 2004 at Swami Ramanand Teerth Marathwada University. He is member of various professional bodies like IE, ISTE, IEEE and Fellow of IETE. Presently he is working as Professor of Electronics Department at Vishwakarma Institute of Technology, Pune, India. His research areas include pattern recognition, fuzzy neural networks and power.

Sanjay Laxmanrao Kurkute, was born in Loni Dist Ahmednagar, Maharashtra, India on December 13, 1973. He completed his B.E.(Electronics) under Pune University and M.Tech in Power Electronics under Visveswariah Technological University, Belgaum in Jan 2001. He is presently undergoing his PhD in Power Electronics. He is presently working as Assistant Prof. in the Department of Electronics & Telecommunication Engineering at Rajarshi Shahu College of Engineering, Pune under University of Pune and has a teaching experience of over 9 years and is a member of various prestigious organizations like IEEE & ISTE.

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(Full Paper , 498 KB)