Load Commutated Inverter (LCI) fed Synchronous motor drive is an attractive solution till date at a high power level (>1MW). Load commutation can be achieved at the three phase power terminal by overexciting the synchronous motor, which simplifies the power converter design. Unfortunately similar solution is not available for an Induction motor as it is inherently a lagging power factor device. Active Reactive Induction Motor (ARIM) is a type of induction motor (One set of 3-phase high voltage power winding and one set of 3-phase low voltage low power exciting winding) where the LCI fed solution is possible. A three-phase high voltage Thyristor based Current Source Inverter and a three phase Low Voltage IGBT based voltage source inverter supplies power to ARIM. The proposed solution is cost effective and saves almost 75% of cost compared to HV IGBT based medium voltage inverter solutions existing today in the market. Moreover run time efficiency of ARIM drive is better compared to the existing solutions. A 3.3 kV/440 Volt 75 kW ARIM drive set up is established and tested successfully at IIT Madras. The details will be discussed.
Prof. Kamalesh Hatua is an Assistant Professor in the Department of Electrical Engineering at IIT Madras. He received his B.E. degree in electrical and electronic engineering from Karnataka Regional Engineering College, Surathkal, India, in 2000. He was awarded the M.Sc. degree and the Ph.D. degree, both, in electrical engineering from the Indian Institute of Science Bangalore, Bangalore, India, in 2004 and 2011, respectively. Prof. Hatua was a Postdoctoral Research Fellow with Future Renewable Electrical Energy Delivery and Management Center, North Carolina State University Raleigh for the development of SiC device-based solid-state transformer during 2010–2012. His area of research interests include medium-voltage electric drives, polyphase induction motor drive, solid-state transformer, power electronics application in power system, design of high-efficient power converters using upcoming SiC power switches, DSP- and FPGA-based controller design for power electronics application.