Space-vector-based pulse width modulation strategies to improve the performance of induction motor drives by Dr. Pavan Kumar Hari

Location and Date: 
Tuesday, September 13, 2016, 4:00 pm, LT 103


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.    

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.