static var theory 2.pdf

On the other hand the voltage at the end of the third

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On the other hand, the voltage at the end of the third segment (i.e., the receiver end) of the ac transmission line in Figure 28 is compensated using an SVC substation, instead of a shunt-capacitor substation. This is due to the fact that SVCs offer a number of advantages over shunt-capacitor substations, most notably a tight and fast compensation of the voltage across the line. Since the receiver end station is located at the end of the ac transmission line, shortly before the electrical power is distributed to consumers, it is important for the voltage at this station to be as perfectly compensated as possible, which is why an SVC substation is used instead of a shunt-capacitor substation. Due to its fast and precise compensation of the voltage at the receiver end of an ac transmission line, an SVC substation is able to, firstly, compensate for the voltage fluctuations occurring across the line (generated by switching shunt capacitors in and out in the substations), and, secondly, compensate for the voltage fluctuations caused by the variation of the load (i.e., the electrical power demand of the consumers). To obtain a level of precision in the voltage compensation at the receiver end of an ac transmission line comparable to that achieved with an SVC but using a shunt-capacitor substation, it would be necessary to install a large number of capacitors of different reactance values in the shunt-capacitor substation. This would give the shunt-capacitor substation a large variety of possible shunt capacitor combinations and, thus, would enable the shunt-capacitor substation to precisely compensate the voltage at the receiver end of the ac transmission line. Such a shunt-capacitor substation, however, would be just as costly (if not more) as an SVC substation, while having a response time that is much slower than an SVC substation. This is why, for fast and precise voltage compensation at the ܺ Receiver end station (SVC) ܺ ܺ Shunt-capacitor substations Sender end (to power generating station) Receiver end (to distribution network)
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Voltage Compensation of AC Transmission Lines Using an SVC Discussion Static Var Compensator (SVC) receiver end of an ac transmission line, SVC substations are much more efficient than shunt-capacitor substations. It would be possible to replace all the shunt-capacitor substations in the ac transmission line of Figure 28 by SVC substations to achieve even more effective voltage compensation. However, even though SVCs are more efficient than shunt-capacitor substations in every aspect, it is not usual to systematically replace shunt-capacitor substations by SVC substations. This is primarily due to the fact that an SVC substation is much more costly (about 5 times more costly) than a shunt-capacitor substation having a comparable power rating. Since the use of shunt-capacitor substations to compensate the voltage along ac transmission lines already yields acceptable results, replacing all shunt- capacitor substations in an ac transmission line by SVC substations is usually not cost effective.
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