application of tcsc to enhance power transfer capability

8/17/2019 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



Contents

• Introduction

• Structure of TCSC

•

Operation of TCSC• Simulation model

• Results

•Conclusion

• References



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.



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%



Fig. structure of TCSC



•

The impedance of TCSC +,TCSC- is given b

• The current through the TCR +ITCR - is given b



• 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



#ig. Reactance vs firing angle characteristic curve.



Oeration of TCSC

a! "yassed

b! T#yristor "$oc%ed

c! &ernier Contro$



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

−

−

=



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 −=



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



Si'u$in% 'ode$



• 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.



(esu$ts



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-.



(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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application of tcsc to enhance power transfer capability

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