Last modified: 22 May 2019 17:07
The course studies the systems for the generation, transmission and use of electrical energy. The per-unit notation system is introduced. Basic approaches in the three phase AC systems analysis are introduced. Three-phase induction and synchronous machines are studied, and a simple equivalent circuit for the machine is derived and used to explore the operating limitations of each type of the machine. Modern power conversion methods are discussed for conversion between AC and DC. This discussion includes power electronic switches and the basic topology of rectifiers, DC-DC converters and inverters. The advantages of switching conversion techniques over traditional circuits are highlighted.
|Session||Second Sub Session||Credit Points||15 credits (7.5 ECTS credits)|
The syllabus of EG3557 is:
1. Introduction to Power Engineering. Generation, transmission, conversion and use of electrical power. (1 lecture)
2. An introduction to AC circuits and 3-phase systems. Phasor notation and modelling (3 lectures ).
3. The pu system and single line diagram representation of power systems. Simple fault calculations and fault levels. (2 lectures )
4. The steady-state operation and performance of 3-phase induction machines. The equivalent circuit of the induction machine. Torque speed curves. (3 lectures )
5. The operation and performance of synchronous machines. The synchronous machine in isolation. Operation on the infinite bus bars. The operating diagram for the synchronous machine in the steady state. Power versus torque angle curves. (3 lectures )
6. An introduction to power electronic devices. The thyristor, diode, power MOSFET, GTO, power BJT, IGBT. Losses in power switches. (2 lectures )
7. Controlled rectification, line commutation, single and 3-phase rectifier circuits. Average DC voltage (4 lectures)
8. DC-DC converters; Modelling buck & boost DC-DC converters. (2 lectures )
9. Inverters, voltage source, current source and pulse width modulation strategies for obtaining variable frequency supplies. (2 lectures )
One component of the coursework is the Design of an electromagnet (10% mark)
A scenario is presented which gives specifications for an electromagnet to be used. Data sheets on core sizes and weights are given as are data sheets on different wire sizes and weights. The specification given also provides the temperature, mass, size restrictions and required force. Using the available data along with ideas from a design lecture covering the relevant theory the students are required to specify a final design, giving details of the core and the coil to be used for the final electromagnet.
Students also carry out the following experiments in the laboratory: (10% mark)
· Harmonics within single and three phase transformers: an examination of the distortion (third harmonic) introduced into a transformer when the core is driven into saturation.
· The Slip ring induction Machine: an investigation of the torque, current and power vs. speed curves of a slip ring induction machine with different rotor characteristics.
Available only to students following an Honours degree programme.
Information on contact teaching time is available from the course guide.
1st Attempt: 1 three-hour written examination paper (75%) and in-course assessment (25%).
Students are expected to keep a logbook of the practical work on the two experiments and it will take into account the keeping of the logbook and performance in carrying out the practical work (15%). The design assignment is assessed on the basis of an extended abstract (10%).
The feedback is given throughout the course:
a) An individual feedback on the laboratories is given in lab log books one week after the submission date.
b) A feedback on the design assignment is given 2 weeks after the submission date.
c) Towards the end of the course, there will be tutorial sessions dedicated solely to feedback on a sample exam paper and past examinations, which are available on MyAbedreen to give students the chance to self-assess their own performance.
d) Students requesting feedback on their exam performance should make an appointment during the scheduled feedback session which will be announced within 4 weeks of the publication of the exam results.
e) Students can receive feedback on their progress with the tutorial questions and course in general on request at the weekly tutorial/feedback sessions.