SIMULATION ANALYSIS OF STATIC VAR COMPENSATOR BASED ON THE MATLAB/SIMLINK (original) (raw)
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Modern Control of Static Var Compensator for Power System Stability Enhancement
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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.
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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 in...
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.
Modeling and Simulation of Static Var Compensator for Voltage Control Using MATLAB/SIMULINK
— Electricity has now been Interconnected power system has been an inherent part of the todays electrical generation. It has becoming more and more complex as there are multiple ways of generations, transmission and distribution. So there is great challenge for proper flow of power and ensuring the system stability. Despite the various use of classical controllers (mechanical switching devices), the implementation of high performance devices is encouraged. The modern system that has the ability of varying the power flow parameters like voltage, impedance, admittance, power angle, damping oscillation etc. in order to enhance the power flow capability is FACTS (Flexible Alternating Current Transmission). Among various FACTS devices, SVC is one of the most popular, reliable and economic controller used in modern power system. It is acquired to have very good design and performance analysis of the SVC device for its better working in the power network. Static Var Compensators are being increasingly applied in electric transmission systems to economically improve voltage control and post-disturbance recovery voltages that can lead to system instability. An SVC provides such system improvements and benefits by controlling shunt reactive power sources, both capacitive and inductive, with power electronic switching devices.
Harmonic Performance Analysis of Static Var Compensator Connected to the Power Transmission Network
Journal of Energy - Energija
The static var compensator (SVC) is a device which is designed to compensate reactive power, increase voltage stability and to reduce voltage fluctuations. Thyristor controlled reactors (TCRs) are composed of reactors in series with bidirectional pair of thyristors. Current through reactors can be continuously controlled by changing the firing angle of thyristor valves, thus the inductive power can be easily controlled. Typical applications of TCRs in AC systems are voltage stabilization and temporary overvoltage reduction, stability improvement, damping of power oscillations and load balancing. In this paper, harmonic performance analysis of SVC equipped with TCRs is presented. SVCs utilizing TCRs generate harmonic currents and therefore it is necessary to determine the effect of harmonics generated by the SVC on the power system and its elements. This includes interaction of the SVC with the system, the SVC performance under balanced and unbalanced operating conditions and finally...
Enhancement of Power System Transient Stability Using Static Var Compensator
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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.
Simulation and Analysis of Static Var Compensator with Matlab
The static var compensator (SVC) is one of the FACTS (flexible AC transmission system) controllers which is widely used to improve power systems transient stability because of its inherent role in controlling the active and reactive power flows in electrical transmission lines. This paper presents an application of (SVC) in electrical transmission lines by simulating a single-machine infinite-bus power system to study the dynamic response and observing the impact of the SVC for stabilizing the network during a voltage variation using Matlab/Simulink® environment.
MULTI-CONTROL MODULE STATIC VAR COMPENSATION TECHNIQUES FOR ENHANCEMENT OF POWER SYSTEM QUALITY
Power quality is often defined as the electrical network's or the grid's capability to deliver a clean and stable power supply. Flexible AC transmission systems (FACTS) devices consist of power electronics circuits that's depend on the thyristor for controlling active and reactive power flows and to maintain the voltage within the allowable limits in normal and abnormal operating conditions. Static Var Compensation (SVC) is one of the most important FACTS devices, that's combined between shunt capacitor and shunt reactor, that's connect with the system by control setting. The control of reactive power by SVC module is depending on firing angle of thyristors. The shunt capacitor module can be called thyristor switched capacitors (TSC) and thyristor-controlled reactors (TCR), that's provide harmonic filters and/or dynamic shunt compensation. TSC operates with series bi-directional thyristor and a damping reactor to prevent the shunt resonance, the thyristors are used to control the capacitor to operate at the required value. TCR operates with series thyristor switch for control. SVC is easy and more accurate to operate with the medium voltage. SVC can be connected with the extra high voltage system via step-down transformer. This paper discusses the SVC to be uses to improve the power system quality, by adding the reactive power to the system. Also, this paper discusses the SVC control by using the MATLAB/Simulink software to discuss the step operation for the SVC with the power system.
This paper describes the effects of static VAR compensator on varying voltages in the system and the role of SVC in stabilizing these voltages. SVC is a relatively new technique for stabilizing the system voltages. It can control voltage accurately, continuously and rapidly. It helps in improving the transient stability of the system and voltage Variations due to sudden surges like lightning etc. The most important quality of SVC is that it can provide both the inductive and capacitive power as required. Simulink toolboxes are used in this paper to construct the static VAR compensator. The SVC consist of two main parts, Thyristor Switched Capacitor (TSC) and Thyristor Controlled Reactor (TCR). There are 3 TSC units and 1 TCR unit used in designing SVC. The TSC units will provide the capacitive power when the system voltage decreases than the rated voltage. The capacitive unit has the leading properties. In case the system voltage decreases by a large magnitude, multiple TSC units will be operated at the same time. Whereas TCR unit provides the inductive power when the system voltage increases than the rated voltage. The inductive unit has the lagging properties. A programmable voltage source is used in the simulations to vary the system voltages as desired by the user to check the response of the SVC controller. The author has also visited and reviewed the practical implementation of the SVC at one of the grid station and has used the same parameters in this paper as in the system implemented at the grid station. The SVC installed at the grid station has not been energized yet. This paper helps the author to compare the results of the simulations of the SVC implementation with that of practical one once the SVC is energized at the grid station. The results of the report show that the SVC works very effectively in keeping the system voltage stable in case of sudden Variations in voltages and reacts very quickly to the Variations. It can be concluded from the results that the SVC is an important part of the power system for the continued stability and reliability of the system.