static var theory 2.pdf

# Figure 29 svc substation in pingguo china siemens ag

• 12

This preview shows pages 3–6. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

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
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.

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.
• One '14
• Reactive Power, Electric power transmission, TCR

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern