Microprocessor based Symmetrical Multipulse Modulation in a Three-Phase Improved Power Quality AC-DC Converter with Four-Quadrant Switch Realizations

Abstract

A three-phase a.c. controller using power MOSFETs operating in high- frequency chopping mode has been developed fabricated and tested with resistive load. The microprocessor based firing scheme is used to test the four-quadrant switch realizations. The output voltage is smoothly varied using symmetrical multipulse modulation by varying the duty cycle, and the relevant experimental results are furnished. The harmonic analysis of the chopped wave is made in terms of the number of pulses per cycle and pulse width. For same values of power factor and per unit output voltage, it can be concluded from the test results that the proposed scheme has much lower values of lower order harmonics as compared to conventional thyristor phase control. The computed results have been experimentally validated.

Indexing terms:

• a.c. power control
• Harmonic profile
• Symmetrical multipulse modulation (SMM)
• Time-ratio control
• Four-quadrant switch (4QSW).

Additional information

Notes on contributors

A N Arvindan

A Narayanan Arvindan graduated in Electrical and Electronics Engineering from College of Engineering, Guindy, Anna University in 1988. He obtained the Masters degree in Power Systems from Regional Engineering College (now NIT), Tiruchirapalli, in 1995, and the PhD degree specializing in Power Electronics from the Faculty of Engineering and Technology, Jamia Millia Islamia (A Central University), New Delhi, in 2007. He has over sixteen years of professional experience including ten years in industry and six years in academics. His industrial experience includes a stint at Asea Brown Boveri, Bangalore, where he designed high current rectifiers in the power electronics division. He has wide field exposure and has completed several projects including electrification of large continuous process plants and OH transmission. He took to academics in 1999 as Assistant Professor in St Joseph’s College of Engineering, and was conferred the ‘Best Teacher’ award for three successive academic years. Currently, he is a Professor in the Department of Electrical and Electronics Engineering at SSN College of Engineering, Chennai, affiliated to the Anna University.

V K Sharma

Virendra Kumar Sharma received his BE degree from Karnataka Regional Engineering College, Surathkal, in 1984, MTech and PhD degrees from UT, Delhi, in 1993, and 2000, respectively. He was a Post Doctorate Fellow at Ecole de technologie supereiure, at Montreal, Canada. He started his academic career in College of Engineering, Pravaranagar, Maharashtra. He is the recipient of Railway Board Medal for his research paper published in Institution of Engineers (India). He has received merit scholarships including QIP research fellowship for higher studies. He has completed major R&D and Thrust area projects funded by AICTE. He has been visiting research associate at IIT, Delhi. He has a few papers published in IEEE transaction, journal of IE (I), IETE and NISCAIR. He has visited USA and Germany for presenting his research findings and undertook one month training on real-time microprocessor applications at ICTP, Trieste, Italy. He is a member of IE (I), IETE, IEE and IEEE. Currently, he is a Professor in Electrical Engineering at Jamia Millia Islamia (A Central University), New Delhi.