ENG2029 : AC Electrical Power and Conversion
- Offered for Year: 2023/24
- Module Leader(s): Dr Andrew Smith
- Lecturer: Dr Shafiq Odhano
- Owning School: Engineering
- Teaching Location: Newcastle City Campus
Semesters
| Semester 2 Credit Value: | 10 |
| ECTS Credits: | 5.0 |
Aims
To introduce students to topics in electrical engineering including single and three-phase AC systems, single phase transformers, synchronous machines, induction machines, and electric drives.
Outline Of Syllabus
Single Phase AC Power: Concepts of real, reactive, and actual power; power factor.
Single Phase Transformers: Theory of operation; equivalent circuit.
Three Phase AC Circuits: Balanced three phase circuits; three phase phasor representations; summation of currents to zero; neutral, star, and delta connections.
Synchronous Machines: Production of rotating field by balanced excitation of the three-phase windings; concept and theory of synchronous operation; theory of synchronous machine with uniform airgap. Equivalent circuits, voltage equations, alternative sink and source conventions, typical phasor diagrams, electrical power as a function of load angle; operation characteristics with constant power and varying excitation, relationships to phasor diagrams; torque angle.
Induction Machines: Transition from synchronous to asynchronous operation; derivation of exact equivalent circuit; modification of exact equivalent circuit by application of Thevenin’s theorem; relationships between 'rotor current', mechanical power, and torque; condition for torque to be maximum; effect of changing rotor resistance on current and torque characteristics.
Electrical Drives: Review of simple AC drives, three-phase PWM voltage source inverter; freewheel diode function, dead-time requirements; analogue implementation of three-phase PWM; constant Volts per Hertz (V/Hz) control of an induction machine
Teaching Methods
Teaching Activities
| Category | Activity | Number | Length | Student Hours | Comment |
|---|---|---|---|---|---|
| Guided Independent Study | Assessment preparation and completion | 10 | 1:00 | 10:00 | Revision for Mid-Term Test |
| Guided Independent Study | Assessment preparation and completion | 1 | 1:00 | 1:00 | Mid Term Formative Online Test |
| Guided Independent Study | Assessment preparation and completion | 17 | 1:00 | 17:00 | Revision for final exam |
| Scheduled Learning And Teaching Activities | Lecture | 24 | 1:00 | 24:00 | In-Person Lectures |
| Guided Independent Study | Assessment preparation and completion | 1 | 1:30 | 1:30 | Summative In-Person Closed Book final exam |
| Scheduled Learning And Teaching Activities | Practical | 1 | 2:00 | 2:00 | In-Person Induction Machine testing |
| Scheduled Learning And Teaching Activities | Practical | 1 | 2:00 | 2:00 | In-Person Synchronous Machine testing |
| Scheduled Learning And Teaching Activities | Practical | 1 | 3:00 | 3:00 | In-Person Matlab session on Electric Drives. |
| Scheduled Learning And Teaching Activities | Drop-in/surgery | 5 | 1:00 | 5:00 | Optional Drop-in surgery sessions |
| Guided Independent Study | Independent study | 1 | 5:30 | 5:30 | Creation of Results Portfolio |
| Guided Independent Study | Independent study | 9 | 1:00 | 9:00 | Tutorial preparation/follow up |
| Guided Independent Study | Independent study | 20 | 1:00 | 20:00 | Reviewing lecture notes; general reading activity |
| Total | 100:00 |
Teaching Rationale And Relationship
Lectures provide the core materials as well as guidance for further reading.
Problem solving is introduced and practiced through the tutorial sessions.
The experimental and computer-based sessions covering machines and electric drives provides an opportunity to gain practical experience with real life machine testing, power electronics, and Matlab / Simulink, and helps students validate the theory introduced in the lectures.
Additional individual support will be offered in timed surgery slots.
Assessment Methods
The format of resits will be determined by the Board of Examiners
Exams
| Description | Length | Semester | When Set | Percentage | Comment |
|---|---|---|---|---|---|
| Written Examination | 90 | 2 | A | 80 | 90 min invigilated in-person closed-book exam |
Other Assessment
| Description | Semester | When Set | Percentage | Comment |
|---|---|---|---|---|
| Portfolio | 2 | M | 20 | Portfolio of the results of the 3 experiments |
Formative Assessments
| Description | Semester | When Set | Comment |
|---|---|---|---|
| Computer assessment | 2 | M | Online mid-term assessment |
Assessment Rationale And Relationship
The individual examination allows students to demonstrate their ability to solve engineering problems based around their knowledge and methodology of the single and three phase AC systems presented in the course material, including induction and synchronous machines, electric drives, and transformers.
The ‘low stakes’ portfolio covering the Synchronous and Induction machine practical experiments and the electric drive simulation work allows students the opportunity to understand and validate the theory taught on the course in a practical setting.
The formative computer-based assessment will assess the students’ current level of understanding of the material taught up to the middle of the semester and provide useful feedback on strengths and weaknesses.
Reading Lists
Timetable
- Timetable Website: www.ncl.ac.uk/timetable/
- ENG2029's Timetable