static var theory 2.pdf

Figure 29 svc substation in pingguo china siemens ag

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cost effective. Figure 29. SVC substation in Pingguo, China (© Siemens AG 2012, all rights reserved). Types of SVCs: TCR-FC and TCR-TSC There are two basic types of SVCs, each having a different combination of the components described in Exercise 1 of this manual: the SVC of the TCR-FC type and the SVC of the TCR-TSC type. Both types of SVCs are covered in detail in the following two subsections. SVC of the TCR-FC type As its name indicates, the SVC of the TCR-FC type consists of a TCR, which absorbs reactive power from the ac power system to which the SVC is connected, and several FCs, which supply reactive power to the system connected to the SVC. The simplified single-wire circuit diagram of an SVC of the TCR-FC type is illustrated in Figure 30. 3
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Voltage Compensation of AC Transmission Lines Using an SVC Discussion 4 Static Var Compensator (SVC) Figure 30. Simplified single-wire circuit diagram of an SVC of the TCR-FC type. As seen in Exercise 1, FCs have a fixed reactance value (i.e., they supply a fixed amount of reactive power) and cannot be switched in or out. The amount of reactive power absorbed by the TCR, on the other hand, can be adjusted as needed from a maximal value (TCR firing angle ൌ 90° ) to zero (TCR firing angle ൌ 180° ). The main voltage, current, and reactive power parameters related to one leg (phase) of an SVC of the TCR-FC type are shown on the circuit diagram in Figure 31. Note that to simplify the circuit diagram, only one FC is used to represent all FCs of the SVC. Figure 31. Simplified circuit diagram of one leg (phase) of an SVC of the TCR-FC-type showing the main voltage, current, and reactive power parameters. When the amount of reactive power required to compensate the voltage in the ac power system connected to an SVC of the TCR-FC type is null, the TCR firing angle is adjusted so that the reactive power absorbed by the TCR fully offsets the fixed amount of reactive power ( ܳ ) supplied by the FCs. When the SVC has to ܫ ௌ௏஼ ܧ ௌ௏஼ ܫ ி஼ ܫ ்஼ோ FCs (fixed ܳ ) TCR (variable ܳ ) To step-down transformer of the SVC TCR Y Y Y or Step-down transformer Transmission line Static var compensator (SVC) Load Y Y FC FC FC To step-down transformer of the SVC
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Voltage Compensation of AC Transmission Lines Using an SVC Discussion Static Var Compensator (SVC) 5 supply reactive power to compensate the voltage in the ac power system (i.e., when the system absorbs reactive power), the TCR firing angle is increased so that the amount of reactive power absorbed by the TCR decreases. The lower the reactive power which the TCR absorbs, the higher the reactive power which the SVC supplies. When the TCR is set to the non-conducting state, the amount of reactive power supplied by the SVC is maximal. The maximal amount of reactive power which an SVC of the TCR-FC type can supply is equal to the reactive power rating (i.e., ܳ ) of the FCs.
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