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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY KAKINADA
III YEAR B.TECH . ELECTRICAL AND ELECTRONICS ENGINEERING-II Sem
POWER SEMICOONDUCTORS DRIVES
Objective:
This course is an extension of power electronics applications to electric drives. This course covers in
details the basic and advanced speed control techniques using power electronic converters that are
used in industry .It is equally important to understand the four quadrant operation of electric drives and
slip power recovery schemes in induction motors. These concepts are also discussed in detail in this
course.
UNIT-I:
Review of Speed Control techniques.
DC motor (field flux, armature voltage control),induction motor (stator voltage, stator frequency, rotor
resistance , rotor e.m.f injection), Synchronous motor.
UNIT-II:
Introduction to Thyristor controlled drives. Single Phase semi and fully controlled converters connected
to d.c separately excited and d.c series motors –continuous current operation- - output voltage and
current waveforms-Speed and Torque expressions –Speed –Torque Characteristics-Problems on
Converter fed d.c motors.
UNIT-III:
Control of DC motors by Single phase Converters
Three phase semi and fully controlled converters connected to d.c separately excited and d.c series
motors –output voltage and current waveforms-Speed and Torque expressions-Speed –Torque
characteristic- Problems.
UNIT-IV
Four Quadrant operations of DC Drives
Introductions to Four quadrant operation- Motoring operations, Electro Braking-Plugging. Dynamic and
Regenerative Braking operations. Four quadrant operation of D.C motors by dual converters- Closed
loop operation of DC motor (Block Diagram Only)
UNIT-V:
Control of DC motors by Choppers
Single quadrant , two quadrant and four quadrant chopper fed dc separately excited and series excited
motors- Continuous current operation-Output voltage and current wave forms-Speed torque
expressions-speed torque characteristics-Closed Loop operation(Block Diagram Only).
UNIT-VI:
Induction motor control Stator side
Variable voltage characteristics -Control of Induction Motor by AC Voltage Controllers-Waveformsspeed torque characteristics Variable frequency characteristics-Variable fre3quency control of induction
motor by Voltage source inverter-PWM Control –close loop operation of induction motor droves(Block
DiagrammOnly)
UNIT-VII
Control of Induction motor-Rotor side
Static rotor resistance control –Slip power recovery –Static Scherbius drive –Static Kramer Drive- their
performance and speed torque characteristics advantages- applications.
UNIT-VIII:
Control of Synchronous Motors
Separate control & self control of synchronous motors-Operation of self controlled synchronous motors
by VSI, Closed Loop control operation of synchronous motor drives(Block Diagram Only), variable
frequency control, pulse width modulation.
TEXT BOOKS:
1. Fundamentals of Electric Drives –by G K Dubey Narosa Publications
2. 2. Power Electronic Circuits, Devices and applications by M.H.Rashid, PHL
REFERENCE BOOKS:
1. Power Electronics-MD Singh and K B Khanchandani, Tata-Mc Graw-Hill Publishing
company,1998
2. Modern Power Electrics and AC Ddrives by B.K.Bose,PHI
3. Thyristor Control of Electric darives-Vedam SubramanyamTata Mc Graw Hill
publications