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2014/15 Undergraduate Module Catalogue

ELEC2520 Energy Systems and Control

20 creditsClass Size: 100

Module manager: Dr L Zhang
Email: L.Zhang@leeds.ac.uk

Taught: Semesters 1 & 2 (Sep to Jun) View Timetable

Year running 2014/15

Pre-requisite qualifications

Standard degree entry / progression criteria

Module replaces

ELEC2510 Power Generation & Electronic ConversionELEC2630 Embedded Systems & Control Engineering

This module is not approved as a discovery module

Module summary

In order to pass this module, students must obtain a mark of at least 30% in the final examination, as well as obtaining an overall mark of at least 40% for the module.

Objectives

In this module students learn the fundamentals of how electricity is generated and converted. Students learn how to analyse and design power conversion circuits and how to analyse 3 phase ac power circuits, including star-delta transforms. Electronic power conversion techniques that are covered include power switching, DC-DC converters, AC-DC converters (rectifiers and inverters) and AC-AC Converters.

Students study the theory and practice of modern control systems, including linear systems analysis using transfer functions, the Laplace transform, the transient response of feedback systems and stability criteria.

Learning outcomes
On completion of this module, students should be able to:
- demonstrate a knowledge and understanding of the synchronous generator and the reasons for using 3-phase systems, including analysis of delta and star arrangements and the relationships between the mechanical, excitation and output variables;
- develop and explain the full equivalent circuit of practical transformers and perform steady-state analysis of its input and output variables;
- understand the principles of power control by switching, thyristor-controlled rectification and line-commutated inversion;
- demonstrate a knowledge and understanding of dc/dc buck and boost converters and the dc/ac inverter with controlled output voltage and frequency;
- show familiarity with practical power conversion circuits;
- draw block diagrams of simple feedback systems to represent an engineering problem, derive closed-loop transfer functions and sketch polar and Bode plots of systems which include cascaded terms;
- analyse the transfer functions of simple systems, obtain impulse and step responses and combine systems in series and in parallel;
- obtain steady-state responses by applying the final-value theorem and frequency response methods;
- explain the significance of the system's characteristic equation and how the poles of a system affect its transient response;
- explain the relationship between unity and non-unity feedback systems and determine the type (class) of a feedback system and relate it to the system's steady-state error for standard reference inputs;
- show a knowledge and understanding of stability in practical and mathematical terms, and how the stability of a feedback system can be inferred from the roots of its characteristic polynomial, and by the use of Nyquist's criterion.

Syllabus

- Sources of energy and economic and environmental factors.
- The alternator: electromechanical arrangement; relationships between mechanical, magnetic and output variables; 3-phase system, star and delta connection; equivalent circuit and phasor diagrams; basic operation of alternator in the power system; control of real and reactive power; synchronous motor/ compensator.
- The transformer: full equivalent circuit; behaviour on open circuit, short circuit and normal load.
- Line-commutated thyristor converters: fully-controlled single-phase converters; supply effects and inversion;half-controlled rectifiers; mean and rms currents, supply power factor.
- Independently commutated converters: power transistor switch; general principles of switching circuits; dc/dc buck and boost converters; dc/ac inverters with controlled output voltage and frequency.
- Linear Systems: Laplace; derivation of transfer functions. Standard form of first-order system. Cascaded and summed transfer functions. Characteristic equation and significance of poles. Standard form of second-order system and its step response. Introduction to Feedback: Effects of feedback.
- System Classification: Relationship between unity and non-unity feedback systems. System type (class) and steady-state errors. Polar Frequency Response: Polar form of complex quantities. Frequency-response from transfer function; cascaded terms. Bode plots.
- Stability: Concept of stability via roots of characteristic equation. Nyquist's criterion.

- Lab classes include:
Identification of single phase transformer equivalent circuit parameters.
DC-DC Chopper converter Implementation with PWM control.
Feedback based closed loop central system.

Teaching methods

Delivery type	Number	Length hours	Student hours
Class tests, exams and assessment	2	1.50	3.00
Lecture	44	1.00	44.00
Practical	5	3.00	15.00
Tutorial	8	1.00	8.00
Private study hours			130.00
Total Contact hours			70.00
Total hours (100hr per 10 credits)			200.00

Private study

- Reading lecture notes and textbook(s)
- Practice exam questions and revision
- Write-up of laboratory report.

Opportunities for Formative Feedback

- Progress in examples classes
- January test
- lab work.

Methods of assessment

Coursework

Assessment type	Notes	% of formal assessment
Report	Practical Report	20.00
In-course Assessment	Diagnostic Test	5.00
In-course Assessment	January test	20.00
Total percentage (Assessment Coursework)		45.00

Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated

Exams

Exam type	Exam duration	% of formal assessment
Standard exam (closed essays, MCQs etc)	2 hr	55.00
Total percentage (Assessment Exams)		55.00

Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated

Reading list

There is no reading list for this module

Last updated: 27/03/2015

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