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Abstract:
Voltage source inverters (VSI) are widely used in variable speed induction motor drive applications. The output voltage and frequency of a VSI is controlled by well-timed switching of the semiconductor switches in the VSI, which is popularly known as pulse width modulation (PWM). The method of PWM strongly infuences the harmonic distortion at the output of the VSI and the inverter switching loss. Space-vector-based PWM offers greater flexibility than carrier-based PWM in terms of special switching sequences. The modulation process and synthesis of PWM waveforms of the special switching sequences is described. A study on the influence of switching sequences on line current distortion, torque ripple and inverter switching loss leads to design of hybrid PWM methods to improve the performance of the induction motor drive. Experimental investigations from a 5-hp sensorless vector-controlled induction motor drive are presented to support analytical and simulation results. Bio-sketch: V. S. S. Pavan Kumar Hari is currently a Postdoctoral Researcher in theSchool of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, USA. He received the B.Tech. degree in 2005 from Acharya Nagarjuna University, Andhra Pradesh. He received the M.Sc.(Engg.) and the Ph.D. degrees from the Indian Institute of Science, Bangalore in 2008 and 2014, respectively. He worked at the Drives Division of ABB Ltd., Bangalore during 2008–2009. His research interests include control and modulation methods for AC motor drives and variable speed generator systems, photovoltaic inverters and application of wide band-gap devices in power electronic systems.