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Topic Title: Static VAR compensator
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Created On: 05 March 2010 04:39 AM
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 05 March 2010 04:39 AM
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Joined: 25 July 2008

We have a SVC connected to the 132kV bus bar through a 132/5.9kV transformer. I have calculated The Delta connected thyristor control inductors (TCR) produce 19.48MVARS. There are 2 capacitor banks ( star connected), one gives 10.5 MVRS and other gives 7.3 MVRS (altogether 17.8 MVRS). My question is,
1. Is this two capacitor banks for giving reactive power or absorb 5th and 7th harmonics or do both jobs.
2. If there is a breaker failure ( loss of load ) what will SVC do? And If there is line fault like under voltage what will SVC do?
3. Can this SVC supply full amount of its VAr capacity ( Ex 17.8 MVRS) to the system?
 15 March 2010 01:24 PM
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Do you have access to any operation and maintenance manuals? The supplier of the equipment will be too willing to give you the answers. Otherwise just give the maker of the equipment and some one may be able to assist you with your questions.

Chris Chew
 16 March 2010 02:09 PM
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1- Both job when capacitor banks equipped by suitable series reactor for tuning with 5th and 7th harmonics. Of course in ideal case the switchable capacitor banks with relevant control system for suitable compensation and filtering may be considered.
2- The significant harmonics will be generated because of the partial conduction of the large reactor under normal sinusoidal steady-state operating condition when the SVC is absorbing zero MVAr. These harmonics are filtered in the following manner.
Triplex harmonics are canceled by arranging the TCR and the secondary windings of the step-down transformer in delta connection. The capacitor banks with the help of series reactors are tuned to filter fifth, seventh, and other higher-order harmonics as a high-pass filter. Further losses are high due to the circulating current between the reactor and capacitor banks especially in low MVAR absorbing.

3- Yes ,when we trip the TCR

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IET » Energy » Static VAR compensator

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