Impact of hybrid FACTS devices on the stability of the Kenyan power system (original) (raw)
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Effects of FACTS devices on power systems voltage stability
2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium, 2000
This paper presents a study of FACTS devices mainly static VAr compensator (SVC) and controlled series compensator (CSC). Their steady-state modeling and effects on power system performance have been studied. It also studies static stability improvement of a power system and hence power flow improvement in the network. Standard stability evaluation technique has been used to identify the optimum place for the implementation of flexible AC transmission system (FACTS) devices and the effects of FACTS on system loadability has been studied and presented here. The technique to identify the optimum location for the placement of FACTS devices is based on the concept of maximum power transferring capability of the lines and buses. The study has been carried out on the IEEE 24 and 118 bus test systems. Study reveals that incorporation of FACTS devices significantly enhanced system stability as well as power transfer capability of the system. Published in: 2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119)
POWER SYSTEM STABILITY AND QUALITY IMPROVEMENT USING FACTS DEVICES
The advent of the 21st century brought about great and enormous quantum of electrical energy needs of the world where the nation’s lively hood is now greatly hinged on the use and application of electrical energy. Recent research shows that the demand of electric power has grown significantly where as power generation and transmission is not expanded due to certain limitations and as a result the transmission lines are being over loaded and losses are inevitable which result to instability of the power system network. Interestingly however, the above limitations are being overcome through the application of flexible alternating current transmission system (FACTS) devices for quality improvement of power transmission systems. The use of FACTS controllers allows the possible control of dynamic control of transmission line variables which include the phase angle, the voltage and the impedance. Similarities between conventional methods and FACTS controller for enhancing power system quality has been considered. The publication focuses on utilizing FACTS devices for the benefits of enhancing electrical power transmission system operation. Classifications of FACTS devices as well as the evolving generation of FACTS controllers have been reviewed. Key Words: - FACTS, Quality, PST, SVC, TCSC, UPFC, STATCOM, IPFC, SSSC, TCPS, SMES
Improvement of Voltage Stability in Power System by Using SVC and STATCOM
The increase in power demand has forced the power system to operate closer to its stability limit. Voltage instability and line overloading have become challenging problems due to the strengthening of power system by various means. The nature of voltage stability can be analysed by the production, transmission and consumption of reactive power. One of the major causes of voltage instability is the reactive power unbalancing which occurs in stressed condition of power system. Flexible AC transmission system (FACTS) devices play an important role in improving the performance of a power system, but these devices are very costly and hence need to be placed optimally in power system. FACTS device like static var compensator (SVC) and thyristor controlled series compensator (TCSC) can be employed to reduce the flows in heavily loaded lines, resulting in a low system loss and improved stability of network. In this paper, a method based on line stability index, real power performance index and reduction of total system VAR power losses has been proposed to decide the optimal location of TCSC. Now a day, Voltage Stability has become a major concern in power systems planning and operation. This problem has become very complex due to the continuous growing on system interconnections and demand for electricity and also due to economical and environmental constraints to properly expand the system. This has increased the importance of implementing suitable and efficient techniques for improving voltage stability of stressed power system. FACTS are one aspect of the power electronics revolution that is taking place in all areas of electric energy. KEYWORDS: Flexible AC Transmission System (FACTS), Static Var Compensator (SVC), PSAT, Voltage Stability, Voltage Stability Index (VSI). I.INTRODUCTION Most of the large power system blackouts, which occurred worldwide over the last twenty years, which are caused by heavily stressed system with large amount of real and reactive power demand and low voltage condition. When the voltages at power system buses are low, the losses will also to be increased. This study is devoted to develop a technique for improving the voltage and eliminate voltage instability in a power system. Application of Flexible AC Transmission System (FACTS) devices are currently pursued very intensively to achieve better control over the transmission lines for manipulating power flows. They can provide direct and flexible control of power transfer and are very helpful in the operation of power network. The power system performance and the power system stability can be enhanced by using FACTS device [1]. FACTS devices, which are power electronic based devices can change parameters like impedance, voltage and phase angle. They also helps to reduce flows in heavily loaded lines, resulting in an increased load ability, low system loss, improved stability of the network, reduced cost of production and fulfilled contractual requirement by controlling the power flows in the network. They provide control facilities, both in steady state power flow control and dynamic stability control [2]. The possibility of controlling Power flow in an electrical power system without generation rescheduling or topological changes can improve the performance considerably. Static Var Compensator (SVC) is one of the most effective device for enhancing the power stability and power transfer capability of transmission network, for this the SVC should be properly installed in the system with appropriate parameter setting. The some factors considering for optimal installation and the optimal parameter of SVC , which are the stability margin improvement, power loss reduction, power blackout prevention and the power transmission capacity enhancement [3].
Power System Stability Enhancement Using Fact Devices
The development of the modern power system has led to an increasing complexity in the study of power systems, and also presents new challenges to power system stability, and in particular, to the aspects of transient stability and small-signal stability. So Power system engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. This is where the Flexible AC Transmission Systems (FACTS) technology comes into effect with relatively low investment, compared to new transmission or generation facilities. Flexible AC transmission system (FACTS) devices use power electronics components to maintain controllability and capability of electrical power system. The paper aims towards the performance of UPFC is compared with other FACTS devices such as Static Synchronous Series Compensator (SSSC), Thyristor Controlled Series Capacitor (TCSC), and Static Var Compensator (SVC) respectively. The simulation results demonstrate the effectiveness of the UPFC on transient stability of the system.
Improvement of Power System Stability Using FACTS Device
Power and Electrical Engineering, 2016
This paper describes the impact of the Flexible AC Transmission System (FACTS) controller, namely Thyristor Controlled Series Capacitor (TCSC), on the transient stability of power transmission. For demonstration of the impact of TCSC on transient stability of a power system, a model of the Slovak power system was used. The devices with a suitable controller can also be used for many other purposes than those for which they were designed.
-The Static Synchronous Compensator (STATCOM) is one of the second generation of Flexible Alternating Current Transmission System (FACTS), which is widely utilized to enhance power system performance due to its several advantages such as compact, high response speed and no harmonic pollution. This paper investigates the effects of STATCOM on the performance of the Nigeria 330 kV, 34-bus power system network. The power flow equations describing the steady-state conditions of the system network before and after compensation were modeled and simulated in the NEPLAN software environment. The results from the analysis revealed that before the application of STATCOM, seven (7) buses of the thirty four (34) buses of the case study have their voltage magnitude below acceptable value limit of 0.95V1.05 p.u., which were enhanced to 1.0 p.u. each at the application of STATCOM. Also, the real and reactive power losses were reduced by 9.4% and 2.4% respectively. Thus, the application of STATCOM on the Nigeria 330 kV power system network stabilizes the system's voltage and causes a reduction in the total power loss, which is an improvement in the power system performance.
Performance Analysis and Comparison of Various FACTS Devices in Power System
This paper investigates the enhancement in voltage stability margin as well as the improvement in power transfer capability of transmission line in a power system with the incorporation of Static Synchronous Compensator (STATCOM), Fixed Capacitor Thyristor Controlled Reactor(FC-TCR and) Static Synchronous Series Compensator (SSSC). A simple transmission line system is modeled in MATLAB/SIMULINK environment. The load flow results are first obtained for an uncompensated system, and the voltage and power (real and reactive power) profiles are studied. The results so obtained are compared with the results obtained after compensating the system using STATCOM, FC-TCR and SSSC to show the voltage stability margin enhancement. The results so obtained after simulation demonstrate the performance of the system for each of the FACTS devices in improving the power profile and thereby voltage stability of the same. All simulations have been carried out in MATLAB/SIMULINK environment.
Review on Comparison of FACTS Controllers for Power System Stability Enhancement
In recent years, power demand has increased substantially while the expansion of power generation and transmission has been severely limited due to limited resources and environmental restrictions. Transient stability control plays a significant role in ensuring the stable operation of power systems in the event of large disturbances and faults, and is thus a significant area of research. Flexible AC transmission systems (FACTS) controllers have been mainly used for solving various power system steady state control problems. FACTS devices are capable of controlling the active and reactive power flows in a transmission line by controlling its series and shunt parameters. This paper presents a review of comparison of different FACTS controllers in the power system for stability enhancement. Benefits of FACTS controllers to power system are also discussed.
Comparison and Performance Analysis of Various FACTS Devices in Power System
International Journal Of Engineering And Computer Science, 2016
In recent years, power demand has increased substantially while the expansion of power generation and transmission has been severely limited due to limited resources and environmental restrictions. This paper investigates the enhancement in voltage stability margin as well as the improvement in power transfer capability of transmission line in a power system with the incorporation of Static Synchronous Compensator (STATCOM), Fixed Capacitor Thyristor Controlled Reactor (FC-TCR and) Static Synchronous Series Compensator (SSSC). A simple transmission line system is modelled in MATLAB/SIMULINK environment. The load flow results are first obtained for an uncompensated system, and the voltage and power profiles are studied. The results so obtained are compared with the results obtained after compensating the system using STATCOM, FC-TCR and SSSC to show the voltage stability margin enhancement. The results obtained after simulation demonstrate the performance of the system for each of the FACTS devices in improving the power profile and thereby voltage stability of the same.
Voltage stability improvement in power systems using facts controllers: State-of-the-art review
2010 International Conference on Power, Control and Embedded Systems, 2010
Flexible AC Transmission Systems (FACTS) devices have been used in power systems since the 1970s for the improvement of its dynamic performance. This paper presents a review on the research and developments in the voltage stability improvement by using FACTS controllers. In this paper several technical issues related to FACTS installations have been highlighted and performance comparison of different FACTS controllers have been discussed. In addition, real-world installations and semiconductor technology development have been reviewed and summarized. This paper also includes the main causes of voltage instability and power scenario in India. In order to deal with the voltage stability problem, the solutions with FACTS-controllers provide voltage support and/or appropriately co-ordinated control actions. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of voltage stability improvement by using FACTS controllers in power system environments.