static var theory 2.pdf

Conversely when the svc has to absorb reactive power

Info icon This preview shows pages 5–7. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 5

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

View Full Document Right Arrow Icon
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.
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern