Comparative Assessment of SVC and TCSC Controllers on the ...
Application of Tcsc to Enhance Power Transfer Capability
Transcript of Application of Tcsc to Enhance Power Transfer Capability
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APPLICATION OF TCSC TO
ENHANCE POWER TRANSFER
CAPABILITY
Presented by:
Kubera u
2SD15EPS05
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Contents
• Introduction
• Structure of TCSC
•
Operation of TCSC• Simulation model
• Results
•Conclusion
• References
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Introduction
• Series Capacitors have been used in long
distance EHV transmission lines for increasing
power transfer.
• The use of thristor control to provide variable
series compensation ma!es it attractive to
emplo series capacitors in long transmission
lines.
• The transmitted power through a line is
inversel proportional to the transfer impedance.
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STR"CT"RE O# TCSC
• mainl constituted b three parts$series compensating
capacitor C% bpass inductance &% bi'direction
thristor and The degree of TCSC basic
compensation is controlled b the capacit si(e ofcapacitor C.
• The main function of bpass inductance & is to
reduce the short circuit current .
• )i'direction thristor SCR is used to transform the
e*uivalent impedance of TCSC which fulfil the
increasing transmission capabilit%
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Fig. structure of TCSC
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•
The impedance of TCSC +,TCSC- is given b
• The current through the TCR +ITCR - is given b
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• when the trigger angle is /012 deg measuring
from the pea! of capacitor voltage% the
e*uivalent impedance of TCSC is appeared as
capacitive.
• 3hen the trigger angle is 2045 deg the
e*uivalent impedance of TCSC is appeared as
inductive% which is shown in below
characteristics
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#ig. Reactance vs firing angle characteristic curve.
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Oeration of TCSC
a! "yassed
b! T#yristor "$oc%ed
c! &ernier Contro$
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TCSC byass 'ode
00
50
00
-50
0
50
00
50
00
Line current
cap voltage
TCR current'67c
TCR
• Thristor full conducting
C L
C LTCSC
X X
X jX X
−
−
=
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TCSC T#yristor b$oc%ed 'ode
0.15 0.155 0.16 0.165 0.17 0.175 0.18 0.185 0.19 0.195 0.2-200
-150
-100
-50
0
50
100
150
200
Time
Line current
cap voltage
'67c
C TCSC jX X −=
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TCSC &arnier 'ode
0.27 0.275 0.28 0.285 0.29 0.2950
0
0
0
0
0
0
0
0
0
0
Line current
cap current
TCR current
Capacitor Voltage
8
C L
C LTCSC
X X
X jX X
−
−
≈
-+
-+
α
α
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Si'u$in% 'ode$
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• The TCSC can operate in capacitive or inductive mode%
although the latter is rarel used in practice. Since the
resonance for this TCSC is around 5/deg firing angle% the
operation is prohibited in firing angle range 41deg '
1deg.
•
The capacitive mode is achieved with firing angles 1'12deg. The impedance is lowest at 12deg% and therefore
power transfer increases as the firing angle is reduced. In
capacitive mode the range corresponds to appro9imatel
412':2;3 power transfer Comparing with the powertransfer of <<2 ;3 with an uncompensated line% TCSC
enables significant improvement in power transfer level.
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(esu$ts
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Conc$usion
• ) TCSC is $aced on a 500%&* $ongtrans'ission $ine* to i'ro+e o,ertransfer. -it#out t#e TCSC t#e o,er
transfer is around 110-* as seenduring t#e /rst 0.5s of t#e si'u$ation,#en t#e TCSC is byassed. T#e
no'ina$ co'ensation is 5* i.e.assu'ing on$y t#e caacitors /ringang$e of 30deg!. T#e transfer
caabi$ity increased uto 400-.
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(eferences
• “Facts Controllers In Power Transmission
And Distribution” by K.(. Padiyar
• “Understanding FACTS”, by #ingorani•
“Simulation and Analysis for eal andeacti!e Power Control wit" Series Ty#eFACTS Controller” &atsa$ . Pate$* C."."#att6ET)E 6SS7 225082953* &o$u'e 2* 6ssue * arc#2012!
• “A##lication $f Tcsc To %n"ance Power&uality” o;taba K#eder<ade# Po,er = -ater>ni+ersity of Tec#no$ogy* 6()7
• Mathworks
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Than! ou