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Voltage Stability Improvement using Static Var Compensator in Power Systems  [cached]
Mark Ndubuka NWOHU
Leonardo Journal of Sciences , 2009,
Abstract: This paper investigates the effects of Static Var Compensator (SVC) on voltage stability of a power system. The functional structure for SVC built with a Thyristor Controlled Reactor (TCR) and its model are described. The model is based on representing the controller as variable impedance that changes with the firing angle of the TCR. A Power System Computer Aided Design /Electromagnetic Transients including DC (PSCAD/EMTDC) is used to carry out simulations of the system under study and detailed results are shown to access the performance of SVC on the voltage stability of the system.
Modeling and Simulation of Static Var Compensator for Improvement of Voltage Stability in Power System  [cached]
Amit Garg Sanjai Kumar Agarwal
International Journal of Electronics Communication and Computer Engineering , 2011,
Abstract: This paper investigates the effects of Static Var Compensator (SVC) on voltage stability of a power system. This paper will discuss and demonstrate how SVC has successfully been applied to power system for effectively regulating system voltage. One of the major reasons for installing a SVC is to improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of SVC in MATLAB/Simulink. In this paper A SVC is used to regulate voltage in a power system. When system voltage is low the SVC generates reactive power (SVC capacitive). When system voltage is high it absorbs reactive power (SVC inductive). The SVC is rated +100 Mvar capacitive and 50 Mvar inductive. The SVC more effectively enhance the voltage stability and increase transmission capacity in a power system.
Enhancement of Voltage Stability in Power System with Optimal Location of Static VAR Compensator  [PDF]
SREENIVASULU. K, GOUSE BASHA. SK
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: In electrical power systems voltage stability problems are exist, by the presence of different load models and undesirable conditions such as short circuit and open circuit faults. This paper presents the effect of different load models on the voltage levels at each bus. The static load types, in which active and reactive powers vary with voltage with independent of time, are used. The voltage levels are improved by the desired location of SVC at required buses. The effect of SVC on voltage control for variable load conditions are investigated, for this purpose load is considered as dynamic load, in which active and reactive powers vary with voltage with dependent of time. Voltages are maintained at desired levels by using minimum number of Static VAR Compensators (SVC) and PI controllers are used to control SVC. Modelling and simulation of the considered system are performed using Mat Lab Sim Power Systems; studied power system is a simple five-bus system.
Design of a Three-Phase Statcom-Based Inductive Static VAR Compensator Using DC Capacitor Voltage Control Scheme  [cached]
Abdulkareem Mokif Obais,Jagadeesh Pasupuleti
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: In this study, a three-phase continuously controlled harmonic-free inductive static VAR compensator is presented. The compensator is built of a three-phase voltage source inverter based statcom. The phase currents of this compensator are linearly and continuously controlled by the statcom DC capacitor voltage. The control strategy is outlined by a process of forcing the capacitor voltage to follow a certain reference voltage which can be varied linearly from its maximum to its minimum values to produce balanced three-phase inductive currents varying in the range of zero to maximum value (I MAX) The proposed compensator was verified on the computer program PSpice.
Voltage Stability Analysis with Static Var Compensator (SVC) for Various Faults in Power System with and Without Power System Stabilizers (PSS)
Mohammad Mohammadi
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: However, in previous study the effect of SVC and PSS on voltage transient in power system with suitable model of these component for various faults such as Single Line to Ground faults (SLG) and Line to line and Line to Line to Ground (LL and LLG) and three phase faults have not been considered and analyzed and investigated. Shunt Flexible AC Transmission System (FACTS) devices, when placed at the mid-point of along transmission line, play an important role in controlling the reactive power Xow to the power network and hence both the system voltage Xuctuions and transient stability. This study deals with the location of a shunt FACTS device to improve transient stability in along transmission line with pre defined direction of real power flow. The validity of the mid-point location of shunt FACTS devices is verified, with various shunt FACTS devices, namely Static Var Compensator (SVC) in a long transmission line using the actual line model. It has been observed that the FACTS devices, when placed slightly oT-centre towards sending-end, give better performance in improving transient stability and the location depends on the amount of local/through load. This study investigates the effects of Static Var Compensator (SVC) on voltage stability of a power system. The functional structure for SVC built with a Thyristor Controlled Reactor (TCR) and its model are described. The model is based on representing the controller as variable impedance that changes with the firing angle of the TCR. A Power System Computer Aided Design /Electromagnetic Transients including DC (PSCAD/EMTDC) is used to carry out simulations of the system under study and detailed results are shown to access the performance of SVC on the voltage stability of the system.
Optimal Placement of Static VAR Compensator in Algerian Network  [PDF]
Fadela Benzergua,Abdelkader Chaker,Mounir Khiat,Naima Khalfallah
Information Technology Journal , 2007,
Abstract: Power systems must be carefully controlled in order to maintain an acceptable power supply quality. Advances in power electronics and control technology have introduced powerful tools to power utilities and more recently, the concept thyristor-controlled Static VAR Compensator (SVC). This study presents a based approach to determine optimal placement of Static VAR compensator SVC for voltage security enhancement, the proposed method has been applied the Algerian distribution system. The SVC placement problem considers practical operating constraints of SVC, the upper and lower bound constraints of voltage at different load levels which minimize the system loss. A sensitivity analysis method is used to select the candidate installation location of the SVC. SVC is integrated into OPF program. More specifically the problem of low voltage profile in Eastern Algerian system is investigated. The effectiveness of the proposed project of SVC placement has been validated on a practical 71-bus Algerian system with respect of the dynamic voltage margins.
Digital Control of Static Var Compensator with Field Programmable Gate Array  [cached]
Ram Shankarrao Dhekekar,N. V. Srikanth
International Journal of Reconfigurable and Embedded Systems (IJRES) , 2012, DOI: 10.11591/ijres.v1i3.548
Abstract: This paper is about real time simulation and implementation of FPGA Digital Control of Static VAR compensator for 750km lab model of artificial transmission line. In this paper, a new method of controlling SVC using Field Programmable Gate Array (FPGA) is suggested. FPGA controller is used to generate the firing pulses required to for Static Var Compensator. Pulses are synchronized with AC input; the delay of pulses determines the firing angle to driver circuit. The proposed control scheme has been realized using XILINX FPGA SPARTAN 2 XC2S200 and tested actual testing proves that these devices when installed, they keep the bus voltage same as reference voltage (sending-end voltage). The results are prominent and give a way for real-time implementation of the proposed control schemes. These control schemes are simulated for the real-time control along with real-time modeling and simulations.The results are prominent and give a way for real-time implementation
Modelling and Simulation of Static Var Compensator (SVC) in Power System Studies by MATLAB
Houari BOUDJELLA,Fatima Zohra GHERBI,Fatiha LAKDJA
Annals of Dunarea de Jos , 2008,
Abstract: This paper presents the modelling and simulation of Static Var Compensator (SVC) in power system studies by MATLAB. In the first step, we have modeled mathematically with MathCAD how to analyze the rating of SVC (Boudjella, 2008). In second step, we have conferred modelling of SVC in power system to analyze its behaviour operating with in control range and outside of control range and how to perform power system studies which is anchored with load flow analysis for SVC realization. In the third step, we have been modelling separately the SVC transfer functions with open control loop in the respective control elements: measuring module, thyristor susceptance control module and voltage regulator module, and we have used lag/led compensators theories to configure open and close loop transfer function with respective gain/phase margin. At the final step, we have controlled the voltage and the reactive power transit in the power system, by SVC device.
Improvement by Voltage Profile by Static Var Compensators in Distribution Substation
International Journal of Instrumentation Science , 2012, DOI: 10.5923/j.instrument.20120102.03
Abstract: This paper presents the potential applications of static var compensator (SVC) as one of the FACTS(flexible alternating current transmission system) controllers, using power electronic switching devices in the fields of power transmission systems with increasing the voltage and power flow in distribution substations. Load flow analysis of 33/11 kV distribution substation is performed to calculate the various values of voltage and power flow at each bus. Low rated static var compensators are installed at load ends. Simulation of this distribution substation with SVC has been developed in the Electrical Transient Analyser Program (ETAP) Environment .The objective of the study are enhancement in voltage at various buses and the improvement in power flows with reduction in branch losses.
A New Harmonics Elimination Method Applied to a Static VAR Compensator Using a Three Level Inverter  [cached]
M. BENGHANEM,Azeddine DRAOU
Leonardo Journal of Sciences , 2005,
Abstract: In this paper the use of harmonics elimination method applied to a three level inverter is shown. The method that calculates the switching angles is shown. Simulations results using PSspice program are carried out to validate the mathematical model.Moreover, the proposed harmonics elimination method was used to control the static VAR compensator (ASVC) which uses a three level voltage source inverter.
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