Multivariable Control System
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EE 6225 – Multivariable Control System
Part I – Advanced Process Control
Assignment
(i) Due Date: 7 April 2023
(ii) Select either Q1 or Q2
(iii)Submit softcopy solution to Assignment
folder in NTULearn Course Folder and include
Your Name and Matriculation Number
1
1(a). Direct Synthesis Method (DSM)
• Consider the following block diagram of a feedback control system
2
Gc G
Set-Point R
Gd
Disturbance D
Output Y
Load LControl
UError E +
-
Controller
Process/
Plant
3( )
( )( )
( )
( )( )
0.5
The Second Order Plus Time Delay (SOPTD) process is given by:
2
5 1 2 1
The disturbance to output is
10 1 5 1
Apply the Direct Synthesis Method (DSM) to design a controller us
s
s
d
e
G s
s s
D Y
e
G s
s s
−
−
=
+ +
=
+ +
ing
the following desired closed loop transfer function
1
where
1
1
(i) Assume , design a PID controller for 1 sec and 10 sec.
(Hi
s
d
c
d c
d
c c
Y
Y eR
G
Y R sG
R
G G G
−
= =
+ −
= =
nt: Using first order Taylor series to approximate 1 in the
denominator of ; the in the numerator will be cancelled by identical term in )
(ii) Using MatLab/Simulink or any sim
s
s
c
e s
G e G
−
−
−
ulation software, plot the output response
to a step input at time 0 sec and a step disturbance input at 60 sec.Y R t D t= =
1(a). Direct Synthesis Method (DSM)
4GR
Gd
D
Y
L
UE +
-
Controller Process
-
Y Y−
G
Y
*
cG
• (a) Block diagram of a feedback control system using IMC
• (b) Block diagram of a feedback control with equivalent standard controller
1(b). 1 Degree of Freedom Internal
Model Control (IMC)
Gc G
Set-Point R
Gd
Disturbance D
Output Y
Load LControl
UError E +
-
Controller
Process/
Plant
5( )
( )
( )( )
( )
( )( )
*
*
The Second Order process with right Half Plane (RHP) zero is given by:
2 1
5 1 2 1
The disturbance to output is
10 1 5 1
An IMC controller is given by
1
where
s
d
c
c
s
G s
s s
D Y
e
G s
s s
G
G f G
G
−
−
− +
=
+ +
=
+ +
= = ( )
*
*
*
, contains time delays and RHP zeros with 0 =1
1
and
1
(i) Assume , design an IMC Controller for 5 sec.
(ii) Derive the equivalent standard controller = an
1
c
c c
c
c
c
G G G G s
f
s
G G G
G
G
G G
+ − + + =
=
+
= =
−
d determine the PID parameters
1
= 1 . Check if you get the same if you use DSM with .
(iii) Using MatLab/Simulink or any simulation software, plot the output res