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Module

ENG2029 : AC Electrical Power and Conversion

  • Offered for Year: 2022/23
  • Module Leader(s): Dr Andrew Smith
  • Lecturer: Dr Glynn Atkinson, Dr Nick Baker, Dr Salaheddine Ethni, 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 three-phase circuits, synchronous machines, induction machines, three-phase transformers, three phase distribution systems, and electric drives.

Outline Of Syllabus

Three Phase 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

Three-phase Transformers:       Three-phase transformer construction; star and delta connections and effect on primary / secondary voltages and currents; phase shifts; reflected impedance.

Three phase Distribution Systems:       Three-phase power system analysis; per-unit system; reasons for per- units; choice of base, single phase representation of balanced polyphase operation.

Teaching Methods

Teaching Activities
Category Activity Number Length Student Hours Comment
Structured Guided LearningLecture materials180:309:00Non-synchronous lecture replacement videos
Guided Independent StudyAssessment preparation and completion15:305:30Writing of summatively assessed lab report
Guided Independent StudyAssessment preparation and completion11:301:30Summatively assessed Closed Book final Exam in Assessment Period.
Guided Independent StudyAssessment preparation and completion91:009:00Revision for final exam
Guided Independent StudyAssessment preparation and completion11:001:00Formatively assessed online test in middle of semester
Scheduled Learning And Teaching ActivitiesPractical13:003:00PiP experimental testing on DC Machines.
Scheduled Learning And Teaching ActivitiesPractical13:003:00PiP experimental testing on Synchronous Machines.
Scheduled Learning And Teaching ActivitiesPractical13:003:00PiP experimental testing on Induction Machines.
Scheduled Learning And Teaching ActivitiesPractical13:003:00PiP Matlab session on Electric Drives. (V/Hz Control)
Scheduled Learning And Teaching ActivitiesPractical13:003:00PiP experimental testing on PWM Generation
Scheduled Learning And Teaching ActivitiesSmall group teaching101:0010:00PiP tutorial per week from 2nd week
Scheduled Learning And Teaching ActivitiesDrop-in/surgery101:0010:00Ten one-hour surgery sessions
Guided Independent StudyIndependent study180:309:00Student reflection of Recorded Lecture Materials and Notes
Guided Independent StudyIndependent study101:0010:00Tutorial preparation/follow up
Guided Independent StudyIndependent study201:0020:00Reviewing lecture notes; general reading activity to supplement knowledge of material
Total100:00
Teaching Rationale And Relationship

The non-synchronous online lecture replacement videos provide the core material for the course.
Present in person (PIP) tutorial sessions will be used to cover worked examples and to take general questions.
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 understand and 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 Examination902A801hour 30min invigilated closed-book exam
Other Assessment
Description Semester When Set Percentage Comment
Practical/lab report2M20Laboratory report covering the DC, Induction, and Synchronous Machine experiments. Maximum of 1500 words.
Formative Assessments
Description Semester When Set Comment
Computer assessment2MOnline 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 3 phase systems including AC induction and synchronous machines, electric drives, and transformers, presented in the course material.
The ‘low stakes’ laboratory report covering the DC, Synchronous, and Induction machine experiments, 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