Subjects Taught Recently
E3015 POWER SYSTEMS AND CONVERSION
Acad Unit: 3.0
Prerequisite: EE2005 AC Circuits and Machines
Effective: Acad Year 2005-2006
Last update: November 2003
OBJECTIVE
The basic objective of the first two modules is to introduce the students to
the overall structure of the electric power supply system starting from
power generation through power transmission, including basic concepts of
power quality, operation and protection. The last two modules further the
students’ knowledge of consumer and industrial power applications involving
motor drives, electromechanical actuators and power electronic systems.
DESIRED OUTCOME
After going through the course, the students will be able to handle routine
technical problems relating to the electrical power supply and have a better
appreciation and understanding of power generation, transmission lines and
loads and their analysis methods. A good understanding of how power supply
quality problems arise, how they are analyzed and mitigated is important in
many technical decisions which electrical and electronic engineers are
expected to make. As variable speed motor drives is the main workhorse in
most industrial plants (e.g. pharmaceutical and wafer fabrication plants)
and building services, knowing their basic characteristics and operation is
essential for careers in manufacturing and building service industries.
Understanding the principles of power electronics and drives opens up new
avenues for the students to pursue in the areas of telecommunication power
supplies, industry automation and electric vehicles.
CONTENT
Fundamentals of Power Systems. System Operation and Protection. Power
Conversion. Electromechanical Power Conversion Systems.
ASSESSMENT SCHEME
Continuous Assessment 15%
Final Examination 85%
SYLLABUS (26 hours)
Fundamentals of Power Systems (8 hours)
Energy sources. Per unit system. Power system components and representation:
synchronous generators, transmission lines and cables. Load representations.
Power transfer.
System Operation and Protection (6 hours)
Power frequency control. Reactive power & voltage control. Symmetrical
faults. Basic protection principles.
Power Conversion (6 hours)
Introduction to power conversion. Harmonics. AC to DC conversion. DC to DC
conversion. DC to AC conversion.
Electromechanical Power Conversion Systems (6 hours)
DC servo motor drive systems. AC variable-speed induction motor drive
systems. Permanent magnet and stepping motor drive systems.
TEXTBOOKS
- Chapman Stephen, Electric Machinery and Power System Fundamentals, 1st
Edition, McGraw-Hill, 2002.(TK2000.C455)
- Sen P C, Principles of Electric Machines and Power Electronics, 2nd
Edition, John Wiley & Sons Inc, 1997.(TK2000.S47p 1997)
REFERENCES
- Wildi T, Electrical Machines, Drives, and Power Systems, 5th Edition,
Prentice-Hall, 2002.
- Agrawal J P, Power Electronic Systems: Theory and Design, 1st Edition,
Prentice-Hall, 2001.(TK7881.15.A38 2001)
- Cory B and Weedy B M, Electric Power Systems, 4th Edition, John Wiley
& Sons Inc, 1997.
**************************************************************************************************
E432N POWER ELECTRONICS AND DRIVES
Acad Unit: 3.0
Prerequisite: EE2005
Parallel Code: E432T
Effective: Acad. Year 2004-2005
Last update: February 2006
OBJECTIVE
The objective of this course is to familiarize the students with the
utilization aspects of power engineering, more specifically the techniques
of solid-state power conversions with their respective applications. To meet
industry requirement for power electronic engineers, adequate practical
knowledge on semiconductors, converter topologies, their modulation
techniques and applications in motor drives, switch-mode and uninterruptible
power supplies are to be provided. To meet current trend, emphasis are also
put to power electronic application in ac transmission and power quality
improvement.
DESIRED OUTCOME
Graduates from this course will be expected to gain a good understanding on
the applications of switching devices and the techniques of static power
conversion, on ac and dc drives controls and protections. Additionally it
will broaden their knowledge on power quality, switch mode power supplies,
and numerous other applications of power electronics from a simple light
dimmer to the mammoth high voltage dc (HVDC) transmission systems. The
course materials will enhance career opportunity of students who would be in
the utility and manufacturing industry such as hard disk drives, power
supplies, motors and controllers.
OTHER RELEVANT INFORMATION
This course is primarily aimed for senior undergraduate students. Prior
basic knowledge of power, machines, electronics and control theory is
useful.
CONTENT
Power Semiconductor Devices and Passive Components. Controlled Rectifiers.
SMPS & DC-DC Converters. Inverters. Power Electronics Applications.
Principles & Control of Electrical Drives.
ASSESSMENT SCHEME
Continuous Assessment 0%
Final Examination 100%
SYLLABUS (26 hours)
Power Semiconductor Devices and Controlled Rectifiers (6 hours)
Characteristics of MOSFETs, IGBTs and their driver circuits. Snubbers.
Single-and three-phase bridge converters. Controlled converters. Various
types of loads. Harmonics and power factor. Inversion of power.
DC-DC and Switch mode Power Supplies (5 hours)
Buck, Boost, Buck-Boost and flyback converters. Quasi-resonant converters,
design criteria. Choppers.
Inverters (5 hours)
Types of inverter circuits. Single-and three-phase inverters. Control of
output voltage. PWM inverters. Control of harmonics.
Power Electronics Applications (4 hours)
Residential applications. Industrial applications. Electric utility
applications. Power conditioning & utility interface.
Principles & Control of Electrical Drives (6 hours)
Industrial drives. Load characteristics. Dynamics of motor load combination.
AC and DC motor starting , braking and speed control. Thermal aspects.
TEXTBOOKS
- Mohan Ned, Undeland Tore M and Robbin William P, Power Electronics:
Converters, Applications and Design, 3rd Edition, John Wiley, 2003.
(TK7881.15.M697 2003)
- Dubey Gopal K, Fundamentals of Electrical Drives, 2nd Edition, Alpha
Science International Ltd, 2001. (TK4058.D814 2001)
REFERENCES
- Rashid M H, Power Electronics, Circuits, Devices and Applications, 3rd
Edition, Prentice-Hall, 2004.(TK7881.15.R224 2004
- Williams B W, Power Electronics: Devices, Drivers, Applications and
Passive Components, 2nd Edition, McGraw-Hill, 1992. (TK7881.15.W721 1992 )
**************************************************************************************************
EE6501 POWER ELECTRONIC CONVERTERS
Acad Unit: 3.0
Prerequisite: Nil
Effective: Acad Year 2004-2005
Last update: November 2003
OBJECTIVE
The objective of this course is to familiarize the participating individuals
with the advanced aspects of power electronic converters. To provide a
comprehensive understanding, coverage from basic device levels to advanced
power electronic converters is accommodated. Control aspects are
highlighted, and practical case studies are discussed.
DESIRED OUTCOME
Having graduated from this course, an individual is expected to gain a good
understanding of the theory and industrial applications of semiconductor
devices, their protection aspects, and their applications in power
conversion schemes. This would prepare the individual for R&D careers in
utilities or in industries dealing with advanced power electronic equipment.
OTHER RELEVANT INFORMATION
This course is aimed for graduate students or engineers already working in
related fields. Prior knowledge of power, electronics and control theory at
the undergraduate level is expected.
CONTENT
Introduction. AC to DC Converters. DC to DC Converters. DC to AC Converters.
AC to AC Converters.
ASSESSMENT SCHEME
Continuous Assessment 20%
Final Examination 80%
SYLLABUS (39 hours)
Introduction (3 hours)
Overview of electronic conversion of power. Power semiconductor switches.
Modulation schemes. Magnetic devices used in power converters.
AC to DC Converters (12 hours)
Power flow in electrical networks.Waveforms with sinusoidal voltages and
currents. Non-sinusoidal waveforms. Line-frequency uncontrolled rectifiers.
Line-frequency controlled rectifiers. Parallel and series connected
poly-phase rectifiers. Single-phase and three-phase switched-mode
rectifiers.
DC to DC Converters (6 hours)
Buck-boost, forward and bridge topologies. Specifications, control and
protection. Soft switching and resonant type DC to DC converters.
DC to AC Converters (12 hours)
Basic concepts of switched-mode inverters. Six-pulse scheme. PWM schemes -
carrier-based, carrierless and optimized methods. Multi-level inverters.
Soft-switching and resonant inverters. Applications to motor drives and
power systems.
AC to AC Converters (6 hours)
AC voltage controllers. Naturally-commutated cyclo-converters. Matrix
converters - their switching schemes, protection and control.
TEXTBOOK
- Mohan N, Undeland T M and Robbins W P, Power Electronics - Converters,
Applications and Design, Third Edition, John Wiley & Sons, Inc., 2003.
REFERENCES
- Kassakian J G, Schlecht M F and Verghese G C, Principles of Power
Electronics, Addison-Wesley, 1991.
- Trzynadlowski A M, Introduction to Modern Power Electronics, John
Wiley & Sons, 1998.
**************************************************************************************************
EE6503 MODERN ELECTRICAL DRIVES
Acad Unit: 3.0
Prerequisite: Nil
Effective: Acad Year 2004-2005
Last update: November 2003
OBJECTIVE
The objective of this course is to familiarize the participating students
with modern industrial electric drives. To provide a detailed understanding
of the industrial drive systems, the theory of operation, modeling and
control of various types of commonly used industrial drives are introduced.
It also aims to broaden a student's knowledge with power electronic
converters, as a wide variety of power electronic converters is used in
controlling modern drive systems.
DESIRED OUTCOME
Graduates of this course are expected to gain a good understanding of the
principle of operation, dynamic and steady-state modelling and controlling
methods of modern electric drives. Furthermore, they will be at ease in
dealing with almost all commonly used types of power electronic converters.
The course will make them ready to embark on a career in the area of
electric drives or in power electronics. It will also prepare the students
for high level R&D in these areas.
OTHER RELEVANT INFORMATION
This course is aimed for graduate students or engineers already working in
related fields. Prior knowledge of power, motors, power electronics and
control theory at the undergraduate level is expected.
CONTENT
Introduction. DC Motor Drives. Induction Motor Drives. Synchronous Motor
Drives. Servo-Motor Drives.
ASSESSMENT SCHEME
Continuous Assessment 20%
Final Examination 80%
SYLLABUS (39 hours)
Introduction (6 hours)
Components of drives. Types of loads. Modelling of mechanical systems. Four
quadrants of operation. Transient processes. Selection of drive components.
Power electronic converters. Closed-loop control.
DC Motor Drives (9 hours)
Types of DC motors. Steady-state and dynamic models of separately-excited DC
motors. Constant-torque control and constant-power control. Four-quadrant
operation. Single-phase and three-phase rectifier-controlled drives.
Chopper-controlled drives. Effects of harmonics. Discontinuous conduction.
Designing speed and current controllers.
Induction Motor Drives (12 hours)
Steady-state and dynamic models. Stationary and rotating reference frames.
Space-phasor model. Voltage source inverter driven drives. Scalar control
methods. Direct and indirect field-oriented control methods. Direct-torque
control. Sensorless control. Effects of harmonics and harmonic control
methods.
Synchronous Motor Drives (6 hours)
Permanent-magnet synchronous motors (PMSM). Field-oriented control and
direct-torque control of PMSM drives. Modelling of brushless DC motors (BDCM).
BDCM drive schemes. Half-wave BDCM drives. C-dump topology.
Servo-Motor Drives (6 hours)
Switched-reluctance, variable-reluctance and permanent-magnet stepper motor
drives. DC and AC servo-motor drives. Piezoelectric and other precision
motor drives.
TEXTBOOK
- Krishnan R, Electric Motor Drives: Modelling, Analysis and Control,
Prentice Hall International, Inc., 2001.
REFERENCES
- Vas P, Sensorless Vector and Direct Torque Control, Oxford University
Press, Inc., 1998.
- Bose B K, Modern Power Electronics and AC Drives, Prentice Hall
International, Inc., 2002.
- Leonhard W, Control of Electric Drives, Springer-Verlag Berlin
Heidelberg, 1996
- Slemon G R, Electric Machines and Drives, Addison Wesley, 1992.
-
**************************************************************************************************
