scholarly journals Analysis of Power System Stability by using Facts Devices

2020 ◽  
Vol 9 (1) ◽  
pp. 1617-1621
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Power Flow ◽  
Power Plants ◽  
Voltage Stability ◽  
Power Structure ◽  
System Stability ◽  
Continuation Power Flow ◽  
Facts Devices ◽  
Flow Feature

The existing years power structure is a big composite unified network that contains of n number of buses and hundreds of power plants. The placing of fresh positions or fixing of new generating unites executes many conservation and economic limitations. As an effect, the present transmission lines are more severely stressed than forever before and which in turn can leave power system exposed to instabilities. To continue safety of such systems, it is necessary to design appropriate procedures to expand power system safety and growth voltage stability limitations. In this project the conclusion of three FACTScontrollers – SVC, UPFC and TCSC on voltage stability are studied. The IEEE-14 bus system is simulated with continuation power flow feature of PSAT software. The benefit of this simulated model is to progress a simple, fast and appropriate procedure which can be applied efficiently to improve the voltage stability.

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.

scholarly journals Load Flow Analysis in Hybrid AC-DC Transmission Network

2021 ◽  
pp. 617-624
Author(s):  
Ajith M ◽  
Dr. R. Rajeswari
Keyword(s):  
Power Systems ◽  
Power System ◽  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Short Circuit ◽  
Flow Analysis ◽  
Load Flow ◽  
System Stability ◽  
And Control

Power-flow studies are of great significance in planning and designing the future expansion of power systems as well as in determining the best operation of existing systems. Technologies such as renewables and power electronics are aiding in power conversion and control, thus making the power system massive, complex, and dynamic. HVDC is being preferred due to limitations in HVAC such as reactive power loss, stability, current carrying capacity, operation and control. The HVDC system is being used for bulk power transmission over long distances with minimum losses using overhead transmission lines or submarine cable crossings. Recent years have witnessed an unprecedented growth in the number of the HVDC projects. Due to the vast size and inaccessibility of transmission systems, real time testing can prove to be difficult. Thus analyzing power system stability through computer modeling and simulation proves to be a viable solution in this case. The motivation of this project is to construct and analyze the load flow and short circuit behavior in an IEEE 14 bus power system with DC link using MATLAB software. This involves determining the parameters for converter transformer, rectifier, inverter and DC cable for modelling the DC link. The line chosen for incorporation of DC link is a weak bus. This project gives the results of load flow and along with comparison of reactive power flow, system losses, voltage in an AC and an AC-DC system.

Geometric Parameterization Technique Based Continuation Power Flow and its Applications in AC/DC Hybrid Power System

2013 ◽  
Vol 732-733 ◽  
pp. 857-863
Author(s):  
Chao Jie Guan ◽  
Jin Quan Zhao ◽  
Jian Hua Yin ◽  
Kun Men ◽  
Chao Hong
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Stability Limit ◽  
Hybrid Power System ◽  
Continuation Power Flow ◽  
Dc System ◽  
Hybrid Power ◽  
Dc Power ◽  
Predictor Corrector

A new continuation power flow method based on local geometric parameterization technique is proposed for voltage stability analysis of AC/DC hybrid power system. By means of the alternating iteration method as the AC/DC power flow algorithm, the proposed method takes the coupling relationship between AC and DC systems into account to modify Jacobian matrix of AC system. Constraints of variables in DC system are also considered, as well as the adjustment of converter transformers tap position and the conversion of converters control modes. Based on the predictor-corrector method, this paper adopts the geometric corrector, and changes the direction of convergence effectively. According to different operation modes of AC/DC system, accurate voltage stability limit and the entire PV curve can be acquired. Simulation results of IEEE test systems are used to show the validity of the proposed algorithm.

scholarly journals Voltage Stability Improvement with finest position of UPFC using GA &PSO

2021 ◽  
Vol 7 (03) ◽  
pp. 280-285
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Reactive Power ◽  
Fitness Function ◽  
Electrical Power ◽  
Stability Index ◽  
Unified Power Flow Controller ◽  
Facts Devices

Power system is a largely inter connected network, due to this interconnection some of the lines may get over loaded and voltage collapse will occur , hence these lines are called weak lines, this causes serious voltage instability at the particular lines of the power system. The improvement of stability will achieve by controlling the reactive power flow. The Flexible Alternating Current Transmission Systems (FACTS) devices have been proposed to effectively controlling the power flow in the lines and to regulate the bus voltages in electrical power systems, resulting in an increased power transfer capability, low system losses and improved stability. In FACTS devices the Unified Power Flow Controller (UPFC) is one of the most promising device for power flow control. It can either simultaneously or selectively control both real and reactive flow and bus voltage. UPFC is a combination of shunt and series compensating devices. Optimal location of UPFC is determined based on Voltage Stability Index (VSI). GA and PSO techniques are used to set the parameters of UPFC [6]. The objective function formulated here is fitness function, which has to be maximized for net saving. The results obtained using PSO on IEEE 14 Bus is compared with that of results obtained using GA, to show the validity of the proposed techniques and for comparison purposes

scholarly journals Analysis of Stability Improvements by Using Capacitors

2018 ◽  
Vol 7 (2.13) ◽  
pp. 357
Author(s):  
Yusmartato . ◽  
Zulfadli Pelawi ◽  
Ramayulis . ◽  
Oris Krianto Sulaiman ◽  
Abdurrozzaq Hasibuan ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Flow ◽  
Power Plants ◽  
Power Transmission ◽  
Voltage Regulation ◽  
System Stability ◽  
Generation System ◽  
Newton Raphson ◽  
Analysis Of Stability ◽  
Flow Study

The demand for electricity has increased substantially while the expansion of electricity generation, power transmission is very limited, due to environmental restrictions, consequently some transmission lines, limiting power factor. Power flow in the generation system, covering the area of North Sumatra and Aceh which is managed by PT. PLN (Persero), ETAP 4.0 (Electrical Transient Analizer Program) is a program that can display GUI (Graphical User Interface) with unlimited bus number, ETAP 4.0 is useful for Power flow study. The data required by ETAP 4.0 on a generation system is a one-line diagram, nominal kV, and generator, bus, transformer, transmission, and safety rating. The power flow approach method used is the Newton-Raphson method with maximum iteration of 99 and the accuracy of 0.000001. The problem of power flows under consideration is the normal state system, one transmission is disconnected, one of the plants is not operating. The results of the power flow study for each problem obtained the lowest bus voltage, the highest losses in the transmis. The largest power distributed in power plants, new in high voltage transmission, increases the power of power from power to load, changes in voltage problems and improves system stability. This paper aims to verify the capacitor's ability to improve voltage regulation (voltage stability) in electric power transmission systems, from this capacitor simulated using ETAP 4.0 included in Newton-Raphson model. 

A Comparative Study of BAT and Firefly Algorithms for Optimal Placement and Sizing of Static VAR Compensator for Enhancement of Voltage Stability

2015 ◽  
Vol 4 (1) ◽  
pp. 68-84 ◽  
Author(s):  
B. Venkateswara Rao ◽  
G.V. Nagesh Kumar
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
Stability Index ◽  
Bat Algorithm ◽  
Transmission System ◽  
Optimal Location ◽  
System Stability ◽  
Optimal Placement ◽  
Static Var Compensator ◽  
Facts Devices

Modern electric power utilities are facing many challenges due to increasing power demand but the growth of power generation and transmission has been limited due to limited resources, environmental restrictions and right-of-way problems. These problems can be minimized by installing Flexible Alternating Current Transmission System (FACTS) devices in modern electric utilities to optimize the existing transmission system. Most effective use of the FACTS devices depend on the fact, how these devices are placed in the power system, i.e. the location and size. An optimal location and size of FACTS devices allows controlling its power flows and thus enhances the stability and reliability of the power systems. In this paper, Firefly Algorithm (FA) and BAT Algorithm (BAT) have been applied and compared to determine the optimal location and size of Static VAR Compensator (SVC) in a power system to improve voltage stability subjected to minimize the active power losses, fuel cost, branching loading and voltage deviation. The effectiveness of the proposed algorithms and improvement of power system stability has been demonstrated on IEEE 57 bus system using fast voltage stability index. The results obtained with variation of parameters of Firefly and BAT Algorithms has been studied and compared with Genetic Algorithm. The results are presented and analyzed.

scholarly journals Gas-to-electricity investment planning for power system stability improvement and environmental sustainability in Nigeria

2019 ◽  
Vol 120 ◽  
pp. 02005
Author(s):  
Oludamilare B. Adewuyi ◽  
Mark. K. Kiptoo ◽  
Ayodeji F. Afolayan ◽  
Ayooluwa P. Adeagbo ◽  
Tomonobu Senjyu
Keyword(s):  
Power System ◽  
Environmental Sustainability ◽  
Power Flow ◽  
Optimal Power Flow ◽  
Voltage Stability ◽  
Economic Assessment ◽  
System Stability ◽  
Voltage Profile ◽  
Investment Planning ◽  
Voltage Stability Enhancement

Power outage is a prominent feature of the current Nigerian power system. However, a properly planned energy sector can help the nations quest for energy sustainability and economic development. Techno-economic assessment of the Nigerian energy facilities for efficient gas-to-grid power integration is presented in this paper using the particle swarm optimization algorithm (PSO) for solving a voltage stability-constrained optimal power flow model on Matlab environment. Investment in gas-fired DG technology can be an economic and sustainable approach for reducing the detrimental effeccts of gas-flaring practices of the petroleum industries on the environment. The technical benefits such as voltage profile improvement and voltage stability enhancement are the main focus of the technical analysis carried out in this study.

scholarly journals Voltage stability assessment using fast non-dominated sorting algorithm 1

DYNA ◽  
2019 ◽  
Vol 86 (208) ◽  
pp. 60-68
Author(s):  
John Edwin Candelo ◽  
Gladys Caicedo Delgado
Keyword(s):  
Power System ◽  
Power Flow ◽  
Voltage Stability ◽  
Sorting Algorithm ◽  
Metaheuristic Algorithm ◽  
Stability Assessment ◽  
Stability Margins ◽  
Continuation Power Flow ◽  
Stability Limits ◽  
Load Generation

This paper presents a method to calculate multiple voltage stability limits (VSLs), voltage stability margins (VSMs), and voltage stability curves (VSCs). A multiobjective metaheuristic algorithm was used to change real and reactive powers of loads and generators and perform contingencies of the network elements. The maximum values of real and reactive powers were selected using fast non-dominated sorting and crowding distance techniques, combined with a conventional power flow (PF), and referred to in this paper as NSPF. The results show that the method can select and assess multiple maximum real and reactive powers allowed for a bus, an area, or the power system and that it can consider changes in load, generation, and contingencies. Results were validated using the PF and continuation power flow methods. The method finds a large number of VSCs in less time than the conventional methods and estimates multiple VSLs and VSMs.

Sign in / Sign up

Export Citation Format

Share Document