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Microgrids—A Future Perspective
Published in Baseem Khan, Sanjeevikumar Padmanaban, Hassan Haes Alhelou, Om Prakash Mahela, S. Rajkumar, Artificial Intelligence-Based Energy Management Systems for Smart Microgrids, 2022
Akhil Gupta, Kamal Kant Sharma, Gagandeep Kaur
A SVC is a device that can control the voltage profile by improving at points in a network in which stability is being compromised due to insufficient reactive power. Its operation is static but connected in parallel and termed a shunt device. This kind of device can be connected at any point or at a point where a voltage dips by a significant amount, like the midpoint of a transmission network. A SVC controls the voltage profile by keeping reactive power in limits by either absorbing or generating it. The control of reactive power is driven by a power electronic interface in a form of anti-parallel SCR, which can be controlled with the help of a firing angle that can be determined between an interval of zero and waveform extinction. A coupling transformer is connected at a point of common coupling and improves the voltage at different buses, keeping the value of the voltage to its reference defined value in a network [34].
Frequency and Voltage Control
Published in Antonio Gómez-Expósito, Antonio J. Conejo, Claudio A. Cañizares, Electric Energy Systems, 2018
Claudio A. Cañizares, Carlos Álvarez Bel, Göran Andersson
The SVC may be composed of two different shunt elements, that is, a thyristor controlled reactor (TCR) and a thyristor switched capacitor (TSC) banks. If fast switching of the capacitor banks is not needed, one can also use breaker-switched capacitors. The TCR is depicted in Figure 9.33, by delaying the firing of the thyristors, a continuous control of the current through the reactor can be obtained, with the reactive power consumption varying between 0 and V2/X, where X is the reactance of the reactor. By combining the TCR with a suitable number of capacitor banks, a continuous control of the reactive power can be achieved by a combination of capacitor bank switching and control of the reactor current. Usually, the TCR and TSC are connected to the high-voltage grid through a transformer, as shown in Figure 9.34.
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.
Optimal Location of Static Var Compensator to Regulate Voltage in Power System
Published in IETE Journal of Research, 2023
Majeed Rashid Zaidan, Saber Izadpanah Toos
The SVC is a pioneer of FACTS devices that typically regulate and control the voltage magnitude by injecting/absorbing reactive power. The conventional configuration of the SVC is a combination of a constant capacitor in parallel with a Thyristor Controlled Reactor (TCR), as shown in Figure 1. The variable susceptance (BSVC) can be obtained from the total effective reactance (XSVC). On the other hand, the XSVC is calculated by the parallel combination of the capacitive reactance (XC) and TCR reactance (XTCR) [14]. where XL is the inductive reactance, and σ is the conduction angle.
Optimal Locations and Sizes of Shunt FACT Devices for Enhancing Power System Loadability Using Improved Moth Flame Optimization
Published in Electric Power Components and Systems, 2022
Mahrous Ahmed Taher, Salah Kamel, Francisco Jurado, Juan Yu
SVC can be considered as a variable reactance connected in shunt with the power system. SVC can absorb or inject reactive power from the system according to the current state for regulation of the voltage at the connection point with the network. Both of reactive power support and voltage regulation can be obtained by SVC leads to enhancement of the power system stability. The most commonly used types of SVC are; Fixed Capacitor (FC) with Thyristor Controlled Reactor (TCR) which called FCTCR and FC with thyristor reactor (TSR) which called FCTSR [41, 42]. FCTCR type is implemented in this article TCR is comprised of reactor with fixed inductance L and a thyristor valve working simultaneously in two directions via controlled firing angle within the range (90°: 180°) related to the voltage of SVC.
Comprehensive learning bat algorithm for optimal coordinated tuning of power system stabilizers and static VAR compensator in power systems
Published in Engineering Optimization, 2020
Bousaadia Baadji, Hamid Bentarzi, Azzeddine Bakdi
Electromechanical oscillations impose great challenges in modern power systems since they limit the maximum power transfer capability and deteriorate the system stability (Kundur, Balu, and Lauby 1994). Power system stabilizers (PSSs) are thus widely employed to damp such electromechanical oscillations and restore operational stability. However, under some operating conditions, PSSs fail to provide enough damping, especially for inter-area oscillation modes. The emergence of flexible alternating current transmission systems (FACTS) provides an alternative solution to improve the system damping (Bian et al. 2016; Shahgholian and Movahedi 2016). Among the various types of FACTS, the static VAR compensator (SVC) is one of the most common devices used for this purpose. Although the SVC is basically employed for regulating the bus voltage, studies have demonstrated that it can also boost the system stability (Mondal, Chakrabarti, and Sengupta 2012; Abido and Abdel-Magid 2003).