scholarly journals Intelligent based technique for under voltage load shedding in power transmission systems

2020 ◽  
Vol 17 (1) ◽  
pp. 110
Author(s):  
Saiful Firdaus Abd Shukor ◽  
Ismail Musirin ◽  
Zulkifli Abd Hamid ◽  
Mohamad Khairuzzaman Mohamad Zamani ◽  
Mohamed Zellagui ◽  
...  
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Power Transmission ◽  
Voltage Control ◽  
Test System ◽  
Load Shedding ◽  
Instability Condition ◽  
Transmission Systems ◽  
Voltage Instability ◽  
Power Transmission Systems

<p>The increasing demand of electric power energy and the presence of disturbances can be identified as the factors of voltage instability condition in a power system. A secure and reliable power system should be considered to ensure smooth delivery of electricity to the consumers. A power system may experience undesired event such as voltage instability condition leading to voltage collapse or cascading collapse if the system experiences lack of reactive power support. Thus, to avoid blackout and cascaded tripping, load shedding is the last resort to prevent a total damage. Under Voltage Load Shedding (UVLS) scheme is one of the possible methods which can be conducted by thepower system operators to avoid the occurrence of voltage instability condition. This paper presents the intelligent based technique for under voltage load shedding in power transmission systems. In this study, a computational based technique is developed in solving problem related to UVLS. The integration between a known computational intelligence-based technique termed as Evolutionary Programming (EP) with the under-voltage load shedding algorithm has been able to maintain the system operated within the acceptable voltage limit. Loss and minimum voltage control as the objective function implemented on the IEEE 30-Bus Reliability Test System (RTS) managed to optimally identify the optimal location and sizing for the load shedding scheme. Results from the studies, clearly indicate the feasibility of EP for load shedding scheme in loss and minimum voltage control in power system.</p>

Classification of Faults in Power Transmission Systems Using Modern Techniques

2017 ◽  
pp. 181-203 ◽  
Author(s):  
Avagaddi Prasad ◽  
J. Belwin Edward ◽  
K. Ravi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Major Part ◽  
Power Transmission ◽  
Fault Classification ◽  
Transmission Systems ◽  
Technical Literature ◽  
Industrial Facilities ◽  
Protection Scheme ◽  
Power Transmission Systems

Power system constitute a major part of the electrical system relating in the present world. Every single portion of this system assumes a major part in the accessibility of the electrical power one uses at their homes, enterprises, workplaces, industrial facilities and so on. Any deficiency in power system causes a ton of inconvenience for the maintenance of the system. So transmission system needs a proper protection scheme to ensure continuous power supply to the consumers. The countless extent of power systems and applications requires the improvement in suitable techniques for the fault classification in power transmission systems, to increase the efficiency of the systems and to avoid major damages. For this purpose, the technical literature proposes a large number of methods. This chapter analyzes the technical literature, summarizing the most important methods that can be applied to fault classification and advanced technologies developed by various researchers in power transmission systems.

scholarly journals STATCOM’s contribution to the improvement of voltage plan and power flow in an electrical transmission network

2018 ◽  
Vol 8 (1) ◽  
pp. 41-52
Author(s):  
Adel Amiar ◽  
Mohamed Adjabi
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Dynamic Performance ◽  
Voltage Regulation ◽  
Transmission Network ◽  
Electrical Transmission ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Flexible Alternating Current Transmission

Flexible alternating current transmission systems are used since nearly four decades and present very good dynamic performances. The purpose of this work is to study the behaviour of a system where static compensator (STATCOM) is located at the midpoint of a long transmission line functioning in disturbed modes with various levels of load caused by tripping and then, reclosing of the incoming station breaker. The studied model and starting from the analysis of various alternatives will lead to the checking of the aptitude of the STATCOM to maintain the voltage plan and to improve the power flow in electro-energetic system which is the east region of Algerian 400 kV transmission network. The steady state performance of STATCOM’s controller is analysed through computer simulations with MATLAB/Simulink program. The simulation results have demonstrated that STATCOM can be effectively applied in power transmission systems to solve the problems of poor dynamic performance and voltage regulation.   Keywords: STATCOM, reactive power, power flow, voltage plan, breaker automatic recloser.

scholarly journals GICs: The Bane of Technology-Dependent Societies

Eos ◽  
2015 ◽  
Vol 96 ◽  
Author(s):  
Delores Knipp
Keyword(s):  
High Voltage ◽  
Power Loss ◽  
Reactive Power ◽  
Power Transmission ◽  
Geomagnetically Induced Currents ◽  
Transmission Systems ◽  
Power Transmission Systems ◽  
Induced Currents

Geomagnetically Induced Currents can cause voltage swings, transformer heating, and reactive power loss in high-voltage power transmission systems.

scholarly journals Voltage Profile Improvement with Combined UPFC and IPFC Facts Devices: A Review

2020 ◽  
Vol 1 (1) ◽  
pp. 26-30
Author(s):  
Violet Kaswii ◽  
Michael Juma Saulo
Keyword(s):  
Power System ◽  
Power Flow ◽  
Reactive Power ◽  
Voltage Control ◽  
System Stability ◽  
Voltage Profile ◽  
Transmission Systems ◽  
Facts Devices ◽  
Flow Controller ◽  
Power Flow Controller

The interline power flow controller (IPFC) and the unified power flow controller (UPFC) are both advanced types of flexible AC transmission systems (FACTS). These devices can provide the power system with control of voltage, and that of real and reactive power. This paper reviews the literature on UPFC and IPFC FACTS devices in voltage control and covers two main areas of research (i) voltage control using FACTS devices, and (ii) UPFCs / IPFCs and their applications in power systems. FACTs devices are applied in modern power system networks for the purpose of voltage control while at the same time providing enhanced power system stability. Research has shown that their benefits in the long run outweighs their high cost especially when they are optimally sized and located in the power network. Moreover, in the planning of power transmission systems, a Multi-Criteria Decision Making (MCDM) technique can help in the incorporation of both the costs and technical viability. This approach provides techno-economic optimization and at the same time meeting environmental criteria.

The Modeling of SVC for the Voltage Control in Power System

2017 ◽  
Vol 6 (3) ◽  
pp. 513 ◽  
Author(s):  
Nor Adni Binti Mat Le ◽  
W Mohd Nazmi bin W Musa ◽  
Nurlida Binti Ismail ◽  
Nurul Huda binti Ishak ◽  
Nur Ashida binti Salim
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Voltage Control ◽  
Load Flow ◽  
Static Var Compensator ◽  
Voltage Instability ◽  
Newton Raphson ◽  
Simulation Results ◽  
Power Limit ◽  
Raphson Method

One of the major causes of voltage instability in power system is the reactive power limit. Therefore, this paper aims to analyze the effect of Static Var Compensator (SVC) on voltage stability of a power system. There are many ways to control the voltage, but in this paper only focus on the SVC and IEEE-9 buses. The SVC circuit and IEEE-9 buses were designed and modelled in Power World. The Newton Raphson method was applied to compute the load flow solution. Then, the reactive power (Q) was injected to SVC and the effect of SVC on IEEE 9-buses were studied. The analysis of voltage control was considered the conditions of fault occurred at the bus. The simulation results obtained in Power World demonstrate that the improvement voltage in the IEEE 9-buses when the Q was injected into SVC circuit. Besides, the QV curve was plotted to show the sensitivity and variation bus voltages with respect to the Q injection.

scholarly journals Optimal Shedding Against Voltage Collapse Based on Genetic Algorithm

2021 ◽  
Vol 11 (5) ◽  
pp. 7695-7701
Author(s):  
M. A. Zdiri ◽  
A. S. Alshammari ◽  
A. A. Alzamil ◽  
M. Ben Ammar ◽  
H. H. Abdallah
Keyword(s):  
Power Transmission ◽  
Load Shedding ◽  
Electricity Production ◽  
Voltage Collapse ◽  
Energy Limit ◽  
Voltage Instability ◽  
Power Transmission Systems ◽  
Widespread Phenomenon ◽  
Production Company ◽  
Corrective Method

The prevalent tendency in power transmission systems is to operate closer and closer to the energy limit, rendering system voltage instability a commonly widespread phenomenon. It is, therefore, necessary that certain remedial corrective controls need be undertaken whenever these systems tend towards failure. In this respect, load shedding stands as a major correction mechanism and such a failure can be prevented and nominal system voltage can be resumed. It is worth noting however that load shedding must be implemented very carefully to ensure the satisfaction of both the customer and the electricity-production company. In this context, our focus of interest is laid on load and machine shedding against voltage collapse as an effective corrective method. It is important to note that such a problem turns out to be commonly defined as an optimization problem under constraints. Using genetic algorithms as resolution methods, the application of the proposed methods was implemented on the 14-node IEEE test network, while considering a number of different case studies.

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