Security Assessment of an Interconnected Power System Considering Voltage Dependent Loads with Dynamic Tap Changer and Exponential Recovery Loads Using Interline Power Flow Controller (original) (raw)
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International Journal of Computer Applications, 2012
paper deals with the overview of a control strategies for power system security assessment of an interconnected power system coordinated with different loads Which is being governed using Flexible AC Transmission system (FACTS) devices when the system is approaching an extreme emergency state. FACTS controllers can be employed to enhance power system stability in addition to their main function of power flow control. In this method, the island is prevented from the total loss of supply using few FACTS devices. The optimization process is carried out using bacterial foraging optimization algorithm. The optimized result exhibits tremendous improvement in the system performance. The proposed scheme is adopted in IEEE 14 bus test system.
Ain Shams Engineering Journal, 2015
As a result of privatization of the electrical industry the power transmission lines have to transfer power at their maximum transmission limits because of the competitive scenario of the electrical market. Hence, secured operation of power system has become one of the most important issues of modern era. In this paper, a probability of severity based placement strategy for Interline Power Flow Controller (IPFC) has been proposed based on Composite Severity Index (CSI). The composite severity index provides an exact measure of stress in the line in terms of mega watt overloading and voltage instability. IPFC is placed on the line which has the highest probability of severity during the occurrence of different outages. The IPFC has been tuned for a multiobjective function using Differential Evolution (DE) and the results have been compared with genetic Algorithm (GA). To verify the proposed method, it has been tested and implemented on IEEE 14 and 57 bus systems.
IEE Proceedings - Generation, Transmission and Distribution, 2005
The operation and planning of large interconnected power systems are becoming increasingly complex. To maintain security of such systems, it is desirable to estimate the effect of contingencies and plan suitable measures to improve system security/stability. The paper presents an approach for selection of unified-power-flow-controller (UPFC-) suitable locations considering normal and network contingencies after evaluating the degree of severity of the contingencies. The ranking is evaluated using composite-criteria-based fuzzy logic for eliminating masking effects. The fuzzy approach, in addition to real-power loadings and bus-voltage violations, also used voltagestability indexes at the load buses as the post-contingent quantities to evaluate the networkcontingency ranking. The selection of UPFC-suitable locations uses the criteria on the basis of improved system security/stability. The proposed approach for selection of UPFC-suitable locations has been tested under simulated conditions on a few power systems and the results for a 205-node real-life equivalent regional-power-grid system of three interconnected utility systems are presented for illustration purposes.
Energies
Power flow reliability, voltage security and transmission congestion management are paramount operational issues in a power system. Flexible AC transmission system (FACTS) controllers are suitable technologies that can provide compensation and dynamic control of power system transmission parameters to enhance effective performance and reliability. The interline power flow controller (IPFC), if optimally placed, can regulate the impedance of multiple lines to improve active power transfer capacity and voltage profile. This study examines the performance of IPFCs for voltage enhancement by suppressing fluctuation. A modified Newton–Raphson load flow problem with an incorporated IPFC variable has been formulated with the objective to improve voltage stability and maintain active power flow. The effectiveness of the proposed method was tested on the Nigerian 41 bus transmission network. The obtained result of the system with an IPFC placed at the weakest bus of the network was compared ...
Applied Soft Computing, 2015
This paper presents a new power system planning strategy which combines firefly algorithm (FFA) with pattern search algorithm (PS). The purpose is minimizing total fuel cost, total power loss and reducing total voltage deviation, with the objective of enhancing the loading margin stability and consequently the power system security. A new interactive and simple mechanism, inspired in brainstorming process, is proposed that allows FFA and PS algorithms to explore new regions of the search space. In this study the Static VAR compensator (SVC) is modeled and integrated in an efficient location which is chosen considering the voltage stability index. The proposed algorithm is interactive and tries to optimize a set of control variables at the same time, namely, active power generations, voltage of generators, tap transformers, and the reactive power of shunt compensators to optimize three objective functions such as: fuel cost, total power loss and total voltage deviation. These variables are optimized using a flexible interactive and competitive search mechanism. The proposed planning strategy has been examined and applied to two practical test systems IEEE 14-Bus and IEEE 30-Bus. Simulation results confirm the effectiveness of this hybrid strategy for solving the security optimal power flow.
IJERT-Optimal Placing of FACTS Devices to Improve Power System Security
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/optimal-placing-of-facts-devices-to-improve-power-system-security https://www.ijert.org/research/optimal-placing-of-facts-devices-to-improve-power-system-security-IJERTV4IS050995.pdf In electric power systems, system no remain in secure operating state due to increased power demand. On other hand, the power system stability has been recognized as an important problem for its secure operation. Several methods are being used conventionally to improve operating margins necessary for system stability. Many of these suffer with excessive response time and considerable amount of power loss. To overcome this difficulty, a rapid development of power electronic devices such as Flexible AC Transmission System (FACTS) devices are used, their primary application is to enhance power transfer capabilities, power system stability and allow more flexible control of power flows. By installing FACTS equipment at optimal sites, the overall system benefits are sought. But the location of these FACTS devices has been big challenge. This challenge is overcome by using Sensitivity Indices analysis method. Here two Sensitivity Indices analysis methods are used and these are; reduction of total system reactive power loss and real power flow performance index sensitivity indices. The 'MATLAB' software is used here to write a programming code for finding out the sensitivity indices for both methods. IEEE-14 bus system is used here for the study purpose.
Optimal Placing of FACTS Devices to Improve Power System Security
— In electric power systems, system no remain in secure operating state due to increased power demand. On other hand, the power system stability has been recognized as an important problem for its secure operation. Several methods are being used conventionally to improve operating margins necessary for system stability. Many of these suffer with excessive response time and considerable amount of power loss. To overcome this difficulty, a rapid development of power electronic devices such as Flexible AC Transmission System (FACTS) devices are used, their primary application is to enhance power transfer capabilities, power system stability and allow more flexible control of power flows. By installing FACTS equipment at optimal sites, the overall system benefits are sought. But the location of these FACTS devices has been big challenge. This challenge is overcome by using Sensitivity Indices analysis method. Here two Sensitivity Indices analysis methods are used and these are; reduction of total system reactive power loss and real power flow performance index sensitivity indices. The 'MATLAB' software is used here to write a programming code for finding out the sensitivity indices for both methods. IEEE-14 bus system is used here for the study purpose.
Performance Analysis of Power System Security Using Sensitivity Indices Analysis Method
— The expansion of power generation and transmission has been severely limited due to limited resources and environmental restriction because in recent years, power demand has increased substantially. Power system stability has been recognized as an important problem for its secure operation. Safe operation of electric power system is largely related to its stability which depends upon on the ability of an electric power system for a given initial operating condition to regain a state of operating equilibrium after being subjected to a physical disturbance, with most system variables bounded so that practically the entire system remains intact. Several attempts have been made to improve operating margins necessary for system stability from the conventional use of power system stabilizer. To overcome this difficulty, a rapid development of power electronic devices such as Flexible AC Transmission System (FACTS) devices are used, but the location of these FACTS devices has been enormous challenge. This challenge is overcome by using Sensitivity Indices analysis method. Here two Sensitivity Indices analysis methods are used and these are; reduction of total system reactive power loss and real power flow performance index sensitivity indices. The 'MATLAB' software is used here to write a programming code for finding out the sensitivity indices for both methods. For the study purpose electrical IEEE-14 bus system is used here.
Optimal Power Flow for Steady state security enhancement using Genetic Algorithm with FACTS devices
2008
This paper presents an enhanced Genetic Algorithm (EGA) based approach to solve the Optimal Power Flow (OPF) with FACTS devices to eliminate line over loads in the system following single line outages. The optimizations are performed on two parameters: the location of the devices, and their values. Two different kinds of FACTS controllers are used for steady state studies: Thyristor Controlled Series Capacitors (TCSCs) and Thyristor controlled Phase shifting Transformers (TCPSTs).
Engineering, Technology & Applied Science Research
The electricity demand is continuously increasing, so a most efficient use of the current power system's capacity is desired. Flexible AC Transmission Systems (FACTSs), a recently developed transmission technology, are widely used to boost the power transfer ability of long-distance transmission line networks and to enhance the consistency of the transmission systems. The use of FACTS devices can lead to reduced flows on heavily loaded lines, targeted bus voltage levels, and better power network stability. In this study, an optimization method based on the optimal position of the Unified Power Flow Controller (UPFC) is suggested to boost system security. It is decided that the real power flow is the best place for the UPFC in this instance. The optimal placement during congestion has been determined using the Genetic Algorithm (GA) and the sensitivity to the useful power flow index. Congestion is produced on the network and system performance is evaluated. The proposed solutions...