Power System’s Voltage Stability Improvement Using StaticVar Compensator (original) (raw)
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Power System’s Voltage Stability Improvement Using Static
2015
— In alternating current systems, voltage fluctuation is a common phenomenon. Most of the voltage fluctuation problems result from the changes in the system’s reactive power resulting from excessive supply or consumption of reactive power by the elements of the system and the variation in the consumers ’ loads. In this paper, the effect of Static Var Compensator (SVC) in stabilizing power system’s voltage through effective reactive power compensation was investigated. Power flow equations involving voltage drop with/without SVC were developed. SVC modeling equations were also developed and used to determine its parameters. Based on the SVC parameters, SIMULINK blocks were used to implement the phase controlled Thyristor–Controlled-Reactor Fixed-Capacitor (TCR-FC) SVC. The Nigerian 28-bus power system used for the study was also modeled using SIMULINK/MATLAB. The 28-bus system was first simulated without SVC and then with two SVCs located at different buses to obtain the bus voltages...
Voltage Stability Improvement using Static VAR Compensator (SVC) in Power System
— Now a days the power system are operated nearer to their stability limits due to economics and environmental reason and due to of this, the secure operation of power system is very important and challenging issue. A system enters a state of voltage instability when a disturbance occurs, increase in load demand & change in system conditions because of voltage collapse. Based on review, to compensate this problem the SVC is used in transmission system. These papers investigate the effect of Static Var Compensator (SVC) on voltage stability and improvement of that stability in power system. In this paper shunt FACTS devices SVC is used in a transmission line for improving a voltage profile and stability. MATLAB Simulink platform has been used in this study. The voltage at various buses is calculated and weak buses are identified to place the FACTS devices to improve the voltage stability limits are analyzed before and after the placement of svc.
International Journal of Research, 2016
Modern Electrical power transmission system is developing and load demands are increasing, problems of voltage flicker and voltage stability has become important subjects in Power System. Now-a-days Flexible AC Transmission System (FACTS) has become a subject of interest for power System Engineers. In this paper, effects of Thyristor Switch Capacitor (TSC), which is one of FACTS Devices, on load voltage are estimated and checked. By this Technology large and slow, old operating Circuit Breakers are eliminated. The modeling and Simulation of TSC are verified using MATLAB 7.8, SimPower system Block set. Proposed technology allows the steady state and dynamic performance of TSC on transmission system by regulating Voltage through generating or absorbing reactive power and accordingly Compensation is carried out. IndexTerms: receiving end voltage (Vr); SVC; gate pulse; sending end voltage(Vs) and Thyristor Switched Capacitor(TSC); SVC Controller; Voltage regulator; MATLAB
Modern Control of Static Var Compensator for Power System Stability Enhancement
2012
The effects of shunt compensation on power system transmission stability and modern approach of the reactive power control scheme have been investigated in this paper. Reactive power compensation is realized in shunt connection with two components: thyristor controlled reactor (TCR) and thyristor switched capacitor (TSC). A special attention has been given in the following paragraphs to a modern control approach for power system stability enhancement which uses fuzzy logic. In the final part of the paper the modern control block scheme of static VAR compensator for reactive power in transmission systems is presented.
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 2014
Voltage stability of a system is affected by reactive power limit of the system. FACTs devices improve the reactive power flow in system thereby improving voltage stability and these are used for controlling transmission voltage, Power flow, dynamic response and reducing reactive losses in transmission lines. This paper explores the effect of SVC on static voltage stability and presents the effect of Static VAR compensator (SVC) on Voltage Profile & Reactive Power for variable load conditions is investigated and presents static methods like Modal Analysis, Two Bus Thevenin Equivalent and Continuation Power Flow methods to predict the voltage collapse of the bus in the power system. WSCC 3-machine, 9-bus system has been used to demonstrate the ability of SVC in improving the voltage stability margin. These FACTs controllers help to increase the load ability margin of the power network. Modelling & simulation have been carried out using MATLAB/SIMULINK Software.
International Journal of Advance Research and Innovative Ideas in Education, 2021
As one of the traditional solutions, the flexible systems of current transmission systems (FACTS) are designed to make power systems more efficient, improve stability and energy quality, and these systems are used in different parts of the world including our country. In general, FACTS can be defined as systems that provide voltage, impedance and phase angle to AC systems. With recent studies, the use of modern technology devices such as static VAr compensator and static synchronous compensator is becoming increasingly common to ensure energy quality in energy systems. In addition, due to advances in semiconductor technology, static VAr compensation systems have been introduced for use on the middle and upper power side. The most important feature of these systems is that they can compensate without requiring active power from the grid. In this study, the required operating power is required by a system provided using a fixed VAr compressor consisting of a thyristor-controlled responder and the properties of a thyristor switch capacitor. In simulation studies, active energy is provided by a static compensator instead of a power source. In this way, unnecessary use of power in the system was prevented. It is recommended that static VAr solutions be used especially when there is unbalanced load and fast operating power required.
Enhancement of Power System Transient Stability Using Static Var Compensator
2013
Power systems are continuously subjected to various types of disturbances which in turn cause the problem of losing stability. As the problem of transient stability is a crucial issue, the tools for mitigating such a sensitive problem have an important significance. Static VAR Compensator (SVC) can control reactive power and therefore is used to improve transient stability as well as the voltage profile. In this paper the mathematical model of the power system equipped with an SVC is systematically derived and the parameters of the SVC are modeled into the power flow equations and used in the control strategy, the SVC is modeled in a 5-bus system and a 30-bus system and implemented in Newton-Raphson load flow algorithm in order to control the voltage of the bus to which the SVC is connected to in a MATLAB written program, the contribution of the SVC to transient stability was tested and verified.
PERFORMANCE ANALYSIS OF THYRISTOR-SWITCHED CAPACITOR (TSC) STATIC VAR COMPENSATOR (SVC
In an electric utility network, it is desirable to regulate the voltage within a narrow range of its nominal value (±5% range around their nominal values). Since the load varies from time to time, the reactive power balance in a grid varies as well. It can be shown that the voltage drop on the line is a function of the reactive power flowing on the line. To control dynamic voltage swings under various system conditions and thereby improve the power system transmission and distribution performance, a fast acting Static VAr Compensator (SVC) is required to produce or absorb reactive power so as to provide the necessary reactive power balance for the system. The function of the SVC is to maintain the voltage of the bus connected at a constant value. In this paper an SVC configuration known as Thyristor-Switched Capacitor (TSC) is examined, as applied to shunt reactive compensation. The compensator was connected to the load end of a system operating at 0.7 power factor. By supplying some value of reactive power, it raised the power factor to an optimal value of 0.96, thereby improving the efficiency of the system.
2016 International Conference on Recent Advances and Innovations in Engineering (ICRAIE), 2016
Power systems are complex systems consisting of large number of generating units and interconnected network of transmission lines. The voltage stability is an issue of prime importance in this complex power system network since the demand for electric power is increasing drastically. The control of reactive power in the transmission lines will enhance the voltage stability of the power system network. This paper presents the design and implementation of the Static V AR Compensator (SVC) in the transmission network for reactive power flow control to improve the voltage stability. The proposed method detects automatically the optimal number of SVCs required for the control of reactive power. The detailed simulation study has been carried out in MATLAB/Simulink environment.
Modelling and Simulation of Static Var Compensator (SVC) in Power System Studies by MATLAB
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.