Introduction to Static Var Compensator.pdf

Random peaks of reactive power demand in order to

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random peaks of reactive power demand in order to reduce the light flicker phenomenon to an acceptable level (see Exercise 3 for more information on light flicker). Because of this, STATCOMs have an advantage over SVCs in ac power systems requiring a critically fast response time. Finally, the installation size and costs are different for SVCs and STATCOMs. SVC installations are larger in size than STATCOM installations, but are significantly cheaper. Either of these criteria (size and cost) can be a decisive factor for the choice between an SVC and a STATCOM, depending on the available space and budget of any given application. For example, if the large size of an SVC installation cannot be tolerated for a particular application, it can become necessary to install a STATCOM even if it is more expensive than the SVC.
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Introduction – Static Var Compensator (SVC) Discussion of Fundamentals 10 Static Var Compensator (SVC) Figure 10. STATCOM installations are smaller in size than STATCOM installations for a given power rating. The above figure shows in the foreground a STATCOM installation in the United Kingdoms (© Image et son/Cnam). To summarize, SVCs are limited in operation at lower voltages, slower, and larger in size than STATCOMs, but are cheaper. The cost of STATCOMs, however, can be a restrictive factor when the installation of an SVC yields acceptable results. As STATCOM technology becomes more and more widespread and installation prices for STATCOMs drop, it is expected that STATCOM technology gradually replaces SVC technology in most applications due to its superior performances.
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Static Var Compensator (SVC) 11 There are many types of SVCs currently available in the industry, each type consisting of a different set of components. Almost all SVCs, however, are a combination of some or all of the following four components: 1. S tep-down transformer 2. T hyristor-controlled reactor 3. O ne or more thyristor-switched capacitors 4. O ne or more fixed capacitors. Note that all these components are three-phase in nature. Figure 11 shows the simplified single-wire diagram of an SVC containing all of the above components. In this example, the SVC comprises only one thyristor-switched capacitor and one fixed capacitor. Main Components of a Static Var Compensator (SVC)
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Main Components of a Static Var Compensator (SVC) Discussion 12 Static Var Compensator (SVC) Figure 11. Simplified single-wire diagram of an SVC. The function and basic configuration of the three-phase, step-down transformer in an SVC was discussed in the Introduction. The following sections describe in detail the three reactive components of an SVC (i.e., the thyristor-controlled reactor, the thyristor-switched capacitor, and the fixed capacitor). Figure 12. SVC substation near Montreal city, Quebec, Canada. This SVC substation compensates the voltage across the long ac transmission lines transferring hydroelectrical power produced in Northern Quebec to the urban areas in Southern Quebec (photo courtesy of ABB).
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