Phần 12 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Ứng dụng Ổn định quá độ trên Phần mềm PSSE)

TRANSMISSION &
DISTRIBUTION
A Division of Global Power
POWER SYSTEM STABILITY CALCULATION TRAINING
D5
A li ti f T i t St bilit
D
ay
5
-
A
pp
li
ca
ti
on o
f

T
rans
i
en
t

St
a
bilit
y
July 10, 2013Prepared by: Frida Ceja-Gomez
eBook for You
OUTLINE

2
OUTLINE
• Introduction to the test system
• Load flow analysis
•
Dynamic simulation setup
•
Dynamic

simulation

setup
• Running a dynamic simulation
• Plotting dynamic simulation outputs
• Simulation 1: Bus fault – All other elements in service
• Simulation 2: Bus fault – Initial system with elements out of
service
• Simulation 3: Line fault –
A
ll elements in service
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3
EXAMPLE 1
-
INTRODUCTION
EXAMPLE

1

-

INTRODUCTION

TO THE TEST SYSTEM
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Input files
4
INTRODUCTION TO THE TEST SYSTEM
Input

files
Th fil i d t f t d ’
Th
e
fil
es requ
i
re
d

t
o per
f
orm
t
o
d
ay
’
s
exercise are the following:

• Day5_savnw.sav
• Day5_savnw.sld
D5 d
•
D
ay
5
_savnw.
d
yr
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Example 1
Single line diagram
5
INTRODUCTION TO THE TEST SYSTEM
Example

1
–
Single

line

diagram
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Example 1
Test system information
6
INTRODUCTION TO THE TEST SYSTEM
Example

1
–
Test

system

information
•
23 bus system
•
23

bus

system
• System divided in 3 areas:
• FLAPCO
• LIGHTCO
• WORLD
• Voltage levels: 500kV, 230kV, 21.6kV, 20kV, 18kV, and 13.8kV
•
No motors present
•
No

motors

present
• Generators, fixed shunts, passive loads, transformers and

branches
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Example 1
Test system area
based report
7
INTRODUCTION TO THE TEST SYSTEM
Example

1
–
Test

system

area
-
based

report
• Go to the Power Flow menu, Reports, Area / owner / zone totals
• Select Report on Areas, All areas, Loads/induction machines connected to
area buses, and click on Go
W th t t l ti l d ti ti l d
•
W
e can see
th
e
t

o
t
a
l
genera
ti
on,
l
oa
d
, reac
ti
ve compensa
ti
on,
l
osses an
d

exports of each area
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Example 1
Inter
area flow report
8
INTRODUCTION TO THE TEST SYSTEM
Example

1
–

Inter
-
area

flow

report
• Go to the Power Flow menu, Reports, Area / zone based reports
• Select Inter area / zone flow, choose output for all areas and click on Go
• We can see the total generation, load, reactive compensation, losses and
tf h
expor
t
s o
f
eac
h
area
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9
EXAMPLE 1
–
LOAD FLOW
EXAMPLE

1

–
LOAD

FLOW

ANALYSIS
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Example 1
–
Load Flow Analysis
10
LOAD FLOW ANALYSIS
Example

1

Load

Flow

Analysis
Performing a quick load flow analysis will allow us to become
familiar with the s
y
stem
y
• Open the saved case (.sav) and single line diagram (.sld)
files
• Solve for load flow and verify convergence at the output bar
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11
LOAD FLOW ANALYSIS
Identify any problems in this base case

• Two buses suffer from low voltage
What is the cause of this low voltage
?
•
There is a transformer with a loading
There

is

a

transformer

with

a

loading

exceeding 100%
Wh i hi l d ?
Wh
y
i
s t
hi
s over
l
oa
d

present
?
c1
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Slide 11
c1 If other ovelroads a
pp
ear, it is because the sld file is set to fla
g
loadin
g
s >90%
cejaf, 2013/05/15
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12
EXAMPLE 1
-
DYNAMIC
EXAMPLE

1

-
DYNAMIC

SIMULATION SETUP
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Converting Loads and Generators
13
DYNAMIC SIMULATION SETUP

Converting

Loads

and

Generators
1. Go to Power Flow menu
2. Select: Convert Loads and
Generators
3. Convert Generators: Select
Zsorce
4
CtttMVAld
4
.
C
onver
t
cons
t
an
t

MVA

l
oa
d
s:

• If active power is 100%
constant current
,
then it
,
depends on V
• If reactive power is 100%
t t d itt th
cons
t
an
t
a
d
m
itt
ance,
th
en
it depends on V
2
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Converting Loads and Generators
14
DYNAMIC SIMULATION SETUP
Converting

Loads

and

Generators
• Check the out
p
ut bar to see if the
p
conversion was successful
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Order network for matrix operations
15
DYNAMIC SIMULATION SETUP
Order

network

for

matrix

operations
1. Go to Power Flow menu,
Solution
2. Select: Order network for
matrix operations
(re
orders
matrix

operations

(re
-
orders

the buses for sparsity)
3. Assume all branches are in
service
4. Verify output bar for any
errors
errors
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Factorize admittance matrix
16
DYNAMIC SIMULATION SETUP
Factorize

admittance

matrix
Go to
Power Flow
menu
Solution
•
Go

to

Power

Flow

menu
,
Solution
• Select: Factorize admittance matrix
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Solving power flow for switching studies
17
DYNAMIC SIMULATION SETUP
Solving

power

flow

for

switching

studies
1. Go to Power Flow menu,
Solution
Solution
2. Select: Solution for
switching studies
3. Verify result
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Saving the converted saved case file
18

DYNAMIC SIMULATION SETUP
Saving

the

converted

saved

case

file
•
Our saved case file is now
•
Our

saved

case

file

is

now

ready to be used in
transient stability
simulations

simulations
• Make sure to save it with a
different name
(
under the
(
File menu, Save…)
• Once converted, this saved
case file cannot be used for
steady state power flow
analysis
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Opening the dynamics data file
19
DYNAMIC SIMULATION SETUP
Opening

the

dynamics

data

file
•
Two options:
•
Two

options:

• Dynamics data file – The program assumes it
is the first dynamics file you open
is

the

first

dynamics

file

you

open
• Add dynamics data file - The program adds
th d t f thi d i fil t th l d
th
e
d
a
t
a o
f

thi
s
d
ynam
i

cs
fil
e
t
o
th
e a
l
rea
d
y
existing data
• So in this case, choose the dynamics data file
option
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Opening the dynamics data file
20
DYNAMIC SIMULATION SETUP
Opening

the

dynamics

data

file
•
The window below will appear
•

The

window

below

will

appear
.
• The starting indices will be discussed in more
detail later so for the moment just select OK
detail

later
,
so

for

the

moment

just

select

OK
.

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Opening the dynamics data file
21
DYNAMIC SIMULATION SETUP
Opening

the

dynamics

data

file
Vif b
•
V
er
if
y output
b
ar
for details and
errors
•
Note that in this
Note

that

in

this

case, no user
defined models
are included
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Dynamic Solution Parameters
22
DYNAMIC SIMULATION SETUP
Dynamic

Solution

Parameters
• Found in the D
y
namics
y
menu
• Here we can modify the
number of iterations
number

of

iterations
,
the tolerance of the
numerical method, etc

Since we are working
•
Since

we

are

working

on a 50Hz system,
change the simulation
steps to half a cycle
• To do so, go to
simulation parameters
and change DELT to
0.01
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Dynamic Simulation Options
23
DYNAMIC SIMULATION SETUP
Dynamic

Simulation

Options
•
Found in the
Found

in

the

Dynamics menu
• Generators with an
l 180º
ang
l
e >
180º
are
unstable, so it is
important to flag
them
them
• Set machine angles
relative to the swing
t
genera
t
or
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Defining the simulation output
24
DYNAMIC SIMULATION SETUP
Defining

the

simulation

output
•
In the
Dynamics
menu,
In

the

Dynamics
menu,

select Define simulation
output by subsystem
Gt
Mhi B
•
G
o
t
o
M
ac
hi
ne,
B
us,
Load and Branch

Quantities
• Select Angle and click on
Go
• Do the same for Voltage
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