TRANSMISSION &
DISTRIBUTION
A Division of Global Power
POWER SYSTEM STABILITY CALCULATION TRAINING
Day 12
-
Case Study
–
IEEE 24 Bus Test System
Day

12

-
Case

Study

–
IEEE

24

Bus

Test

System
PART 1
July 19, 2013Prepared by: Frida Ceja-Gomez
eBook for You

–
SAVED

CASE

BUILD-UP
eBook for You
Building a SAV file
4
SAVED CASE BUILD-UP
Building

a
.
SAV

file

• The
p
ur
p
ose of this exercise is to build a test case from
pp
scratch on PSS®E and then perform all the types of
analysis covered during Part A of this course
• We will build a 24-bus power system based on the IEEE
Reliability Test System 1996
T b i thi PSS®E t
Fil

a
.
SAV

file

• Leave the MVA Base as 100 and the frequency as 60Hz
• We will input the transformer ratings in MVA units
For non
transformer branches the current will be expressed as
•
For

non
-
transformer

branches

the

current

will

be

expressed

as

•
2

=>

PV

bus
• 3 => Swing bus
eBook for You
Branch Data
7
SAVED CASE BUILD-UP
Branch

Data
• The transmission line data for the IEEE 24-bus system can be found in
the table below
eBook for You
Machine Data
8
SAVED CASE BUILD-UP
Machine

Data
• Our test s
y
stem has 10
g
enerators


0
.
125pu

for

all

machines
• These values are the step-up transformer impedance in pu on Mbase
• Leave Gentap = 1, which is the transformer off-nominal turns ratio in pu on
the system base
•
PSS®E assumes the GSU transformer has a delta
-
wye
configuration as
PSS®E

assumes

the

GSU

transformer

has


e
IEEE

24
test system
h
as t
h
e
fi
ve
230
-
138kV

transformers shown below
•
Note that these have a
Y
grounded
•
Note

that

these

have

a

• Vmin = 1.00
eBook for You
13
SAVED CASE BUILD-UP
Fixed Shunt Data
• The system only has one fixed shunt
capacitor
eBook for You
14
IEEE 24
–
CREATING A
SINGLE
IEEE

24

–
CREATING

A

SINGLE

LINE DIAGRAM
eBook for You
Single Line Diagram
15
CREATING AN SLD
Single

eBook for You
Single Line Diagram
16
CREATING AN SLD
Single

Line

Diagram
• The buses
should appear
on the diagram,
as shown to the
right
• Note that with
th A t D
th
e
A
u
t
o
D
raw
Option it is
possible to grow
more than 1
more

than


the

lines
eBook for You
Single Line Diagram
18
CREATING AN SLD
Single

Line

Diagram
• Ri
g
ht-click on
g
Bus 11 and
select Grow N
levels
• Grow 1 level and
re-order the
lt
e
l
emen
t
s as
shown on this
picture

Single

Line

Diagram
• Similarl
y,

g
row
y, g
buses 23, 20,
and 19
• The SLD
should look
like the one
htth
s
h
own
t
o
th
e
right
eBook for You
Single Line Diagram
21
CREATING AN SLD
Single

Line

Diagram
• Now expand
Buses 24 and
15
• Then grow
Buses 16 and
Buses

16

and

17
eBook for You
Sin
g
le Line
23
CREATING AN SLD
g
Diagram
• Finally, grow
Bus 22 one
level
• Now that we
have all the
have



Primitives tool
menu, select the
rectan
g
le o
p
tion
gp
shown below
• With this tool it is
possible to create a
ffth
f
rame
f
or
th
e
diagram as shown
to the right
eBook for You
Inserting title and legend
25
CREATING AN SLD
Inserting

title

and

title/legend and
selecting the
selecting

the

Properties option
eBook for You