70530 POWER ELECTRONICS

Year	No.	Offer	Mode	Description			Cred. Pts
97	70530 	S1  	X 	POWER ELECTRONICS         	1.00

Contents

• Staffing
• Pre-requisite(s)
• Synopsis
• Objectives
• Topics
• Texts
• Recommended References
• Student Workload
• Assessment Details
• Other Requirements

STAFFING:

PRE-REQUISITE(S)

70230+70326 or E0003+E2007

SYNOPSIS:

Power  Electronics deals with study of semiconductor  devices  in  the
electric energy industry. The power semiconductor devices, such as the
diode,  thyristor,  triac  and power transistor,  are  used  in  power
applications  as  switching  devices. The modern  electrical  engineer
requires  a  knowledge  of  these devices  and  their  application  in
rectification,  inversion, frequency conversion,  dc  and  ac  machine
control, and controlled power supplies.

Engineers  need  to  be  aware of the undesirable  effects  any  power
electronics equipment imposes on both the supply system and the  load,
and how these effects may be minimised.

OBJECTIVES:

A student who has mastered this unit should be able to :

1. explain the principle of operation of, discuss the ratings,
   and sketch the circuit symbol and appropriate; characteristics
   for common power semiconductor devices;
   
2. sketch the basic circuits, input and output waveforms, and
   calculate from these waveforms the mean d.c. output voltage
   for single phase and three phase, uncontrolled, half
   controlled and fully controlled half wave and full wave
   rectifier circuits;
   
3. explain phase control in ac circuits using thyristors,
   including inversion;
   
4. analyse quantitatively the step up, step down, buck boost,
   half bridge and full bridge dc to dc converters;
   
5. analyse quantitatively the idealised half bridge, full bridge,
   centre tapped and three phase square wave and PWM inverters;
   
6. describe the features and sketch the basic circuit of an
   uninterruptible power supply (UPS) system including an
   electronic bypass switch;
   
7. list the advantages and applications of induction heating and
   melting;
   
8. sketch the basic schematic diagrams and do simple quantitative
   analysis on HVDC systems and static var compensators;
   
9. sketch the basic circuits, input and output waveforms of
   modern dc and ac adjustable speed drives;
   
10. explain the different modes of operation of modern dc and ac
    adjustable speed drives;
    
11. describe the influence of thyristor converters on supply
    networks and loads and ways of minimising their effects and
    the limits imposed in AS2279.
    

TOPICS:

 Description                                                    Weighting(%)

Power semiconductor devices: ratings, characteristics and             10.00
protection

Uncontrolled and controlled rectification and inversion               7.00

Switching commutation and control circuits                            7.00

Inverters and dc to dc converters                                     10.00

Uninterruptible  power  supplies; induction  heating  and             7.00
melting; switch mode power supplies

Influence  of  power electronic equipment on  supply  and             7.00
load  -  power  factor,  harmonics  and  radio  frequency
interference

DC adjustable speed drives                                            12.00

AC adjustable speed drives                                            12.00

Stepper motor drives                                                  6.00

HVDC; static var compensators                                         10.00

Protection of power electronic circuit and equipment                  6.00

Other   applications:  electric  traction,  power  factor             6.00
controller, programmable controller

TEXT and MATERIALS to be PURCHASED:

RECOMMENDED REFERENCE MATERIALS:

IEEE Spectrum.

IEE proceedings.

Electrical Engineer (Australia).

Australian Standards AS2279.

ABB Review.

IEEE Transaction on Power Electronics.

IEEE Transactions on Industry Applications.

STUDENT WORKLOAD REQUIREMENTS:

	ACTIVITY				HOURS
Tutorials/Workshops                           	4
Field Trips                                   	5
Report Writing                                	15
Residential School                            	12
Directed Study                                	86
Private Study                                 	50
Examinations                                  	3

ASSESSMENT DETAILS:

No  *F/S Marks     Due        Description                              Wtg(%)    LBL
1   S              27/03/97  WRITTEN ASSIGNMENT 1                      10.00     Y
2   S              09/05/97  PRACTICAL REPORTS                         20.00     Y
3   S              30/05/97  WRITTEN ASSIGNMENT 2                      10.00     Y
4   S              END S1    3 HOUR CLOSED BOOK EXAM                   60.00     N

OTHER REQUIREMENTS:

1    Attendance  is compulsory in practical work sessions (residential
     school).
2    Students  must achieve at least 50% of maximum possible marks  in
     the examination, and at least 50% of total maximum possible marks
     for a pass in the unit.
3    Because  it is normal practice to release model answers  promptly
     after the due date, the penalty for late submission of assignment
     work will normally be the loss of all marks for the assignment.
4    The   Faculty  of  Engineering  and  Surveying  will  NOT  accept
     submission  of  hand written or typed assignments  by  facsimile,
     email  or computer diskette. Students in remote locations who  do
     not  have regular access to postal services may be given  special
     consideration.
5    A  minimum  standard of communication skills must be demonstrated
     in order for a passing grade to be achieved.