Phần 13 KHÓA ĐÀO TẠO TÍNH TOÁN ỔN ĐỊNH VÀ ỨNG DỤNG TRÊN PHẦN MỀM PSSE CHO KỸ SƯ HỆ THỐNG ĐIỆN (Các tính toán phân tích sự cố trên Phần mềm PSSE)

TRANSMISSION &
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A Division of Global Power
POWER SYSTEM STABILITY CALCULATION TRAINING
D5
FltAli
D
ay
5
-
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A
na
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ys
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s
July10,2013
Prepared by: Peter Anderson
eBook for You
OUTLINE
2
OUTLINE
• Symmetrical Components
• Sequence Impedances
• Analysis of Fault Conditions
RttifFlt
•

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epresen
t
a
ti
on o
f

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au
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s
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SYMMETRICAL COMPONENTS
SYMMETRICAL

COMPONENTS
3
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SYMMETRICAL SEQUENCE COMPONENTS
4
SYMMETRICAL

SEQUENCE

COMPONENTS
Any given set of Unbalanced Three
-
phase Vectors
Any

given

set

of

Unbalanced

Three
phase

Vectors

can be represented by the sum of three sets of
Balanced or Symmetrical vectors
AA ACB
BC
B
C
PositiveSe
q
uence Ne
g
ativeSe
q
uence
Z
eroSe
q

uence
q
g q
q
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RELATIONSHIPS BETWEEN PHASE
5
VECTORS & SEQUENCE COMPONENTS
A
Piti S
P
os
iti
ve
S
equence
1A1C1A
2
1B1A
aI=I,Ia=I,I
0
B
2
B
1
B
B
0A2A1AA
I
+

I
+
I
=
I
I+I+I=I
A
B
C
NegativeSequence
2
0C2C1CC
0
B
2
B
1
B
B
I+I+I=I
I
I
I
I
B
C
2A
2
2C2A2B2A
Ia=I,aI=I,I

2
021A
I
+
aI
+
I
a
=
I
I+I+I=I
B
C
ACB
ZeroSequence
0
A
0
C
0
A
0
B
0
A
I
=
I
,
I

=
I
,
I
02
2
1C
021B
I+Ia+aI=I
I
+
aI
+
I
a
=
I
0
A
0
C
0
A
0
B
0
A
I
I
,

I
I
,
I
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SEQUENCE IMPEDANCES
SEQUENCE

IMPEDANCES
6
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SEQUENCE IMPEDANCES
7
SEQUENCE

IMPEDANCES
SequenceCurrents&VoltagesareIndependentofeachother
•PositiveSe
q
uenceCurrentsonl
y

p
roducePositiveSe
q
uenceVolta
g
e
q y p q g
Drops

PositiveSequenceCurrentsaredeterminedsolelybythePositive
SequenceDrivingVoltagesproducedbythePowerSources,thePositive
SequencevoltageatthePointofFaultandtheSystemPositiveSequence
Impedance
NegativeSequenceCurrentsaredeterminedsolelybytheNegative
SequencevoltageatthePointofFaultandtheSystemNegativeSequence
Impedance
Impedance
ZeroSequenceCurrentsaredeterminedsolelybytheZeroSequence
voltage at the Point of Fault and the System Zero Sequence Impedance
voltage

at

the

Point

of

Fault

and

the

System

Zero


Sequence

Impedance
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SEQUENCE IMPEDANCES
8
SEQUENCE

IMPEDANCES
ThePositiveSequenceNetworkcontainsthePositiveSequenceDriving
Volta
g
es
p
roducedb
y
thePowerSourcesandtheS
y
stemPositive
g p y y
SequenceImpedancestothePointofFault
TheNegativeSequenceNetworkcontainstheNegativeSequence
ImpedancesfromthePowerSourcestothePointofFault(NoDriving
Voltages)
Th Z S Nt k ti th Z S Id t
Th
e
Z
ero
S

equence
N
e
t
wor
k
con
t
a
i
ns
th
e
Z
ero
S
equence
I
mpe
d
ances
t
o
thePointofFaultandanyconnectionstoEarth(NoDrivingVoltages)
eBook for You
POSITIVE SEQUENCE IMPEDANCE
9
POSITIVE

SEQUENCE

IMPEDANCE
TransmissionLines
Ia
Ib
Ea
Eb
Ic
Ec
Z1=E/I
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ZERO SEQUENCE IMPEDANCE
10
ZERO

SEQUENCE

IMPEDANCE
TransmissionLines
E
I
I
E
I
Z0=E/I
eBook for You
ZERO SEQUENCE IMPEDANCE
11
ZERO

SEQUENCE

IMPEDANCE
Transformers
I
I
E
I
I
I
I
I
I
Z0=E/I
Ampere‐turnsareequalineachHVandLVWinding
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ZERO SEQUENCE IMPEDANCE
12
ZERO

SEQUENCE

IMPEDANCE
Transformers
I
I
L
I
E
I

I
I
I
H
L
I
I
n
Z0 n
H
L
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ZERO SEQUENCE TRANSFORMER
13
CONNECTIONS
H L
A
A
B
B
ZO
B
B
SwitchesA&BinitiallyOPEN
ForGroundedWye Winding–CLOSESwitchA
ForDeltaWinding
–
CLOSESwitchB
eBook for You
ZERO SEQUENCE TRANSFORMER

14
CONNECTIONS
H
L
H
L
H
L
H
L
GroundedWye/Delta Delta/GroundedWye
H L
H L
T
Grounded
Wye
/Grounded
Wye
T
Grounded
Wye
/Grounded
Wye
/Delta
Grounded

Wye
/Grounded

Wye

Grounded

Wye
/Grounded

Wye
/Delta
eBook for You
ZERO SEQUENCE TRANSFORMER
15
CONNECTIONS
WARNINGNOTICE
0
0
H L
T
Yg Yg
HLPSSE
X
0
H‐N
N
X
0
L‐N
X0
T
N
D
T

Rg
3Rg
X0
T
‐
N
H L
3Rg X0
H‐N
N
X0
L‐N
T
X0
T‐N
CORRECTMODEL
eBook for You
ANALYSIS OF FAULT CONDITIONS
ANALYSIS

OF

FAULT

CONDITIONS
16
eBook for You
ANALYSIS OF SHORT
CIRCUIT CONDITIONS
17

ANALYSIS

OF

SHORT
-
CIRCUIT

CONDITIONS
ThreePhaseFault
0
=
I
+
I
+
I
C
B
A
V
=
V
=
V
=
V
C
B
A

0
=
I
3
+
)
a
+
a
+
1
(
I
+
)
a
+
a
+
1
(
I
0=)I+Ia+aI(+)I+aI+Ia(+)I+I+I(
0
=
I
+
I
+
I

0
2
2
2
1
02
2
1021
2
021
C
B
A
V=ZIa‐ZIa‐Ea=V
V=ZI‐ZI‐E=V
V
=
V
=
V
=
V
2
2
1
1
22
B
2211A
C

B
A
0=I,0=)a+a+1(Since
0
=
I
3
+
)
a
+
a
+
1
(
I
+
)
a
+
a
+
1
(
I
0
2
0
2
1

V3=0=V+V+V
V=ZIa‐ZIa‐aE=V
CBA
22
2
11C
2
2
1
1
B
0=V=V=V
CBA
2
2
3
3
0=I
0=V)a‐1(=ZI)1‐a(=)ZIa‐ZIa‐Ea(‐)ZI‐ZI‐E(=aV‐V
2
22
2
22
2
11
3
3
2211BA
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ANALYSIS OF SHORT

CIRCUIT CONDITIONS
18
ANALYSIS

OF

SHORT
-
CIRCUIT

CONDITIONS
Three Phase Fault
Three

Phase

Fault
0=I,0=I,
Z
E
=I
02
1
1
E
F1
Z1
F2
Z2 F0
Z0

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ANALYSIS OF SHORT
CIRCUIT CONDITIONS
19
ANALYSIS

OF

SHORT
-
CIRCUIT

CONDITIONS
Single Phase to Ground Fault
Single

Phase

to

Ground

Fault
021
021
Z+Z+Z
E3
=I=I=I
0=I=I
0=V

CB
A
PhasetoPhaseFault
E
I
I
PhasetoPhasetoGroundFault
0
2
E
)
Z+Z
(
0=I
Z+Z
=
I
‐=
I
0
21
21
0
100221
0
2
1
EZ‐
=
I

ZZ+ZZ+ZZ
)
(
=I
2
0
100221
2
EZ‐
=I
ZZ+ZZ+ZZ
=
I
100221
0
ZZ+ZZ+ZZ
eBook for You
REPRESENTATION OF FAULTS
REPRESENTATION

OF

FAULTS
20
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ANALYSIS OF SHORT
CIRCUIT CONDITIONS
21
ANALYSIS

OF

SHORT
-
CIRCUIT

CONDITIONS
Fault Positive Negative Zer o
3Ф
3Ф
F1
F2
F0
Ф‐E
F0F2F1
Ф‐Ф
F0F2F1
Ф‐Ф‐E
F0F2F1
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