static var theory 2.pdf

# Conversely when the svc has to absorb reactive power

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Conversely, when the SVC has to absorb reactive power to compensate the voltage in the ac power system (i.e., when the system supplies reactive power), the TCR must absorb enough reactive power to, firstly, fully offset the fixed amount of reactive power supplied by the FCs, and, secondly, absorb enough extra reactive power to compensate for the reactive power supplied by the ac power system connected to the SVC. This means that the power rating of the TCR in an SVC of the TCR-FC type needs to be higher than that of the FCs, otherwise, the SVC would not be able to absorb reactive power from the ac power system to which it is connected. The reactive power exchange characteristic of an SVC of the TCR-FC type is illustrated in Figure 32. Figure 32. Reactive power exchange characteristic of an SVC of the TCR-FC-type. As the figure shows, the total reactive power ܳ which an SVC of the TCR-FC type exchanges with the ac power system to which it is connected is equal to the variable reactive power ܳ absorbed by the TCR minus the fixed reactive ܳ ܳ (equal to power rating of the FCs) ܳ ൌ |ܳ | െ |ܳ | ܳ ்,௖௔௣.௠௔௫. ܳ ௅,௠௔௫. (Power rating of the TCR) The ac power system absorbs reactive power The SVC absorbs reactive power ܳ ்,௜௡ௗ.௠௔௫. The SVC supplies reactive power The ac power system supplies reactive power Reactive power Reactive power

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Voltage Compensation of AC Transmission Lines Using an SVC Discussion 6 Static Var Compensator (SVC) power ܳ supplied by the FCs. The total reactive power ܳ of an SVC of the TCR-FC type thus ranges from the maximal capacitive reactive power ܳ ்,௖௔௣.௠௔௫. , which is equal to the reactive power rating ܳ of the FCs, to the maximal inductive reactive power ܳ ்,௜௡ௗ.௠௔௫. , which is equal to the reactive power rating ܳ ௅,௠௔௫. of the TCR minus the reactive power rating ܳ of the FCs. When the total reactive power ܳ in the SVC is negative, the SVC supplies reactive power. Conversely, when the total reactive power ܳ in the SVC is positive, the SVC absorbs reactive power. In order for an SVC of the TCR-FC type to operate properly, it is necessary for the control and monitoring components of the SVC to be implemented effectively. The two main tasks that the SVC controller must perform to meet the reactive power requirement of the ac power system connected to the SVC are summarized below. To determine the amount of reactive power that must be absorbed by the TCR to precisely meet the amount of reactive power needed for accurate compensation of the voltage in the ac power system connected to the SVC, taking into account the amount of reactive power supplied by the FCs. To control the TCR firing angle (and, consequently, the rms value of the current flowing in the TCR) so that the amount of reactive power absorbed by the TCR corresponds to the value determined above.
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• One '14
• Reactive Power, Electric power transmission, TCR

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