Module Title: 4C3 Digital Control Systems Code: EE4C03 Level: Senior Sophister (Optional module) Credits: 5

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Module Title:


4
C
3

Digital Control Systems


C
ode:


E
E
4C0
3


L
evel
:


Se
nior Sophister

(
Optional

module)


C
redits
:


5


L
ecturer(s)
:


Professor Frank Boland

(
frank.boland@tcd.ie
)



Mr Dermot Geraghty (
dermot.geraghty@tcd.ie
)






M
odule Organisation


Semester

Start
Week

End
Week

Associated

Practical

Hours

Lectures

Tutorials

Per
week

Total

Per
week

Total

2

1

12

0

3

33

1

11

Total Contact Hours:

44



M
odule Description

This module introduces the technology of control systems and their applications in power
electronic control devices to control motors, such as AC

and
DC
m
otors, etc.
The aim is to
equip the student with the ability to select and design suitable control systems. Aspects of
the
module

include:
P
rogrammable
L
ogic
C
ontrollers

(PLC’s)
, PID,
r
eal
t
ime control and
d
igital
c
ontrol.



L
earning Outcomes

On completion of this
mod
ule
, the student will be able to:


U
nderstand the operation of

DC

power control systems as commonly employed in
motor control systems e.g. controlled and uncontrolled rectifier bridges;


U
nderstand the control strategies for DC
m
otors and the types of
controllers commonly
used with these motors i.e. motor drives;


U
nderstand the operation of Programmable Logic Controllers (PLCs), ladder logic and
state machine design;


D
escribe the dynamical behaviour of controlled processes through use of time and
trans
form domain descriptors;


E
xplain the role and function of sampling and quantization in dig
ital control loops;


E
xplain criteria for stability and dynamic response constraints as applied

to closed
-
loop
control systems;


T
ranslate a word description of a contr
oller specific
ation into a formal description;


D
esign compensators for closed loop control

using industrial controllers;


C
arry out modelling and design of a digital controller using state
-
space methods
.





M
odule Syllabus


Process
Modelling
:

Input
-
output
models based on transfer functions and state
-
space
models der
ived from engineering analysis.
System identification.


System Analysis:

Basic
behaviour

of systems in open and closed loop in terms of
stability, transient and steady
-
state responses
.


Control
System Design:

Specification of the performance of controlled systems and the
de
sign of appropriate algorithms.
Direct Digital Control, DDC, controllers and tuning.
These topics will be illustrated by examples such as speed/position controllers as used
i
n elevators, liquid
-
level control systems and robotic systems.



R
ecommended Text(s)


Feedback Control of Dynamic
Systems
,

4th edition
, GF Franklin, JD Powell and ML
Workman, Addison
-
Wesley
.


Digital Control of Dynamic
Systems,
3rd edition
, GF
Franklin, JD P
owell and ML
Workman, Addison
-
Wesley
.


Supplementary Reading

Module

notes from a Chemical Engineering module on process control at the University of
Texas at Austin:


http://www.che.utexas.edu/course/che360/index.html

Module

notes from an Electrical Engineering module on digital control at University of
Saskatchewan, Canada:


http://www.engr.usask.ca/classes/EE/480/



T
eaching Strategies

The
module

is taught using a combi
nation of lectures, laboratories

and tutorials.
The
laboratory session introduces students to the apparatus of control systems including
controlled rectifiers, such as the fully controll
ed full wave rectifying bridge.
They are also
introduced to speed control of a DC motor and implement P, PI and P
ID speed control of a
DC motor.
The transient behaviour of the control system is also investigated.


For the digital control section of the
m
odule,

the strategy is a mixture of lectures, problem
-
solving tutorials and group
-
based project work.
During tutorials, students work on written
analysis problem
s with the aid of the lecturer.
The intention is to cover problems relating to
the material c
overed

in lectures during each week.
The lecturer supervises each student as
they work through problems, giving adv
ice and assistance as required.
During the tutorial,
the lecturer illustrates the essence of the solution to each problem once the clas
s ha
s made
a realistic attempt.
The project wo
rk is undertaken in groups of 3 to
4 students.
The
objective of the project is defined in descriptive terms and the group must decide on an
appropriate approach and use Matlab as a tool for obtaining a practical
solution.



A
ssessment

Assessment is based on an annual formal written two
-
hour examination

and
laboratory/practical work.
The annual examination contributes
85% to
wards

the overall
mark with the remaining 15% of the marks obtained from a laboratory and
project
programme.