China
Africa
Explore chapters and articles related to this topic
FACTS and HVDC
Published in Stuart Borlase, Smart Grids, 2018
Neil Kirby, Johan Enslin, Stuart Borlase, Neil Kirby, Paul Marken, Jiuping Pan, Dietmar Retzmann
A static VAr compensator (SVC) is a regulated source of leading or lagging reactive power. By varying its reactive power output in response to the demand of an automatic voltage regulator, an SVC can maintain virtually constant voltage at the point in the network to which it is connected. An SVC comprises standard inductive and capacitive branches controlled by thyristor valves connected in shunt to the transmission network via a step-up transformer. Thyristor control gives the SVC the characteristic of a variable shunt susceptance. Figure 18.8 shows three common SVC configurations for reactive power compensation in electric power systems. The first configuration consists of a thyristor-switched reactor and a thyristor-switched capacitor (TSC). Since no reactor phase control is used, no filters are needed. The second consists of a thyristor-controlled reactor (TCR), a TSC, and harmonic filters (FC). The third consists of a TCR, mechanically switched shunt capacitors (MSC), as well as FC.
Flexible AC Transmission Systems (FACTS)
Published in Leonard L. Grigsby, Power System Stability and Control, 2017
The most versatile SVC involves a thyristor switched capacitor (TSC) in shunt with a TCR, known as TSC-TCR. This configuration results in both lower losses and a smaller size inductor as compared to the FC-TCR [13], albeit at a higher cost. Figure 19.7 illustrates the general configuration of a TCR-TSC-type SVC [5,15]. Small series inductors are provided in the TSC branches to provide filtering of the characteristic harmonics generated by the TCR [13,14]. In some cases an additional high pass filter may also be installed. The SVC typically operates at a medium voltage due to the voltage ratings of the thyristors and is usually always connected to the high-voltage transmission system through a coupling transformer.
Review of Impacts of Static Var Compensator Allocation on Radial Distribution Networks
Published in IETE Journal of Research, 2019
Milad Zamani-Gargari, Farshad Kalavani, Kazem Zare
SVC is one of the FACTS devices that provides reactive shunt compensation with shunt-connected capacitors and reactors to get a better voltage profile and reduce the reactive power consumption in a power system [19]. The basic components of SVC are shunt capacitors and reactors. The amount of these components are varied with thyristor switching. The popular types of SVC are thyristor controlled reactor (TCR), thyristor switched capacitor (TSC), and TSC with TCR [20,21]. A TCR is employed in combination with a TSC when reactive power generation or absorption is required. This is usually the optimum solution for sub-transmission and distribution networks to improve voltage profile [22].