Course Details

Subject {L-T-P / C} : EE6403 : Power Electronic Converters and Machine Drives {3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Anup Kumar Panda


Power Electronic Devices: Diodes, Transistors, Thyristors, MOSFET and IGBT - operating principle, Static, dynamic and thermal characteristics, Data sheet ratings, gate drive circuits Single phase half controlled and fully controlled AC/DC bridge converter with R, R-L, R-L-E (motor) loads: operation (both rectifier and inverter modes) , waveforms ,harmonics (output voltage/current and input current) assuming continuous conduction, input current (ac) displacement, distortion and power factor, effect of input line inductance assuming constant current dc load, closed form expression of output dc current with general R-L-E load, discontinuous conduction mode of operation, Torque-speed characteristics of converter controlled separately excited dc motor in continuous and discontinuous mode of conduction Three phase half controlled and fully controlled AC/DC bridge converter assuming constant dc current load : operation in rectifier and inverter modes, waveforms, output voltage and input current harmonics, input power factor and effect of input line inductance, series and parallel operation of converters, power factor improvement, 12 pulse/18 pulse operation, transformer connection, dual converters DC-DC choppers: basic voltage commutated thyristor chopper analysis , Separately excited DC motor drive using DC-DC choppers made of gate controlled devices, four quadrant operation, dynamic and regenerative braking of series DC motor using choppers Basic DC-DC converters: buck, boost buck-boost and Cuk converter, operation, waveforms and design DC-AC inverters using gate controlled devices: single phase and three phase square wave inverters, operation waveforms and harmonics in pole voltage, load phase voltage and line voltage, output voltage control in single phase square wave inverter using chopper control and phase shift, harmonic analysis, operating principles of single phase and three phase PWM inverters, modulation techniques, SPWM, Selective Harmonic Elimination PWM and delta modulation, harmonic spectrum and comparison among different PWM techniques Variable frequency operation of three phase induction motors: Steady state analysis, Torque-speed , current-speed and slip frequency -speed characteristics and operating limits with constant volts/Hz and constant air gap flux operation, implementation using PWM VSI.

Course Objectives

  1. To analysis the operation of the different power electronic converters with various loads
  2. To study chopper fed dc motor drives.
  3. To study inverter fed ac motor drives.

Course Outcomes

1: Competency in function of various power electronics devices.
2: Skill of analyzing power electronic devices.
3: Able to select and design important elements of a power converter system.
4: Competency in developing dynamic model of ac drive system.

Essential Reading

  1. N. Mohan, T.M. Undeland& W.P. Robbins, Power Electronics: Converter, Applications & Design, John Wiley & Sons , New York, 2003
  2. G. K. Dubey, Fundamentals of Electrical Drives, Narosa Publishing House , 2002

Supplementary Reading

  1. M.H. Rashid, Power Electronics, Circuits, Devices, and Applications, Pearson , 2003
  2. B. K. Bose, Modern Power Electronics and A.C. Drives, PHI , 2002