Fuzzy Enhancement of Power System Stability Using FACTS Devices

2011 ◽  
Vol 110-116 ◽  
pp. 5200-5205 ◽  
Author(s):  
J. Hamad ◽  
K. El-Bahrawy ◽  
R. Sharkawy
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
System Stability ◽  
Flow Index ◽  
Voltage Profile ◽  
Facts Devices ◽  
Voltage Stability Enhancement ◽  
Compensation Device ◽  
Shunt Compensation ◽  
Criticality Index

This paper investigates voltage stability of the power system during steady state and transient conditions. The voltage stability enhancement is achieved by utilizing FACTS devices at the best location of the system. The weakest bus in the system is the best location to implement shunt compensation device. In this paper, the weakest buses are identified via a fuzzy technique that utilizes two critical indices: Line Flow Index (LFI) and Voltage Profile Index (VPI) during normal and fault conditions. These indices are used to evaluate Criticality Index (CI) using Fuzzy rules, and thus, the system buses are ranked. Remedial actions are discussed to enhance the power system voltage stability by using FACTS devices (SVC and STATCOM) at the most vulnerable system buses. The results of this study show that the (STATCOM) performance is preferable to that of the (SVC) during fault conditions.

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 OPTIMAL PLACEMENT OF FLEXIBLE ALTERNATING CURRENT TRANSMISSION SYSTEM (FACTS) DEVICES FOR STATIC VOLTAGE STABILITY ENHANCEMENT

2014 ◽  
pp. 12-15
Author(s):  
ANJU GUPTA ◽  
P. R. SHARMA
Keyword(s):  
Stability Analysis ◽  
Power System ◽  
Voltage Stability ◽  
Stability Margin ◽  
Transmission System ◽  
System Stability ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Static Voltage Stability ◽  
Facts Devices

This Voltage stability problems increasing day by day because of demand increase. It is very important to analyze the power system with respect to voltage stability. Location of FACTS devices is important for the enhancement of voltage stability. This paper investigates the voltage stability analysis of 14 bus systems by optimally locating Flexible AC Transmission System (FACTS) devices. Shunt and series FACTS controllers are introduced in the weakest bus and its effectiveness is assessed by comparing voltage profile and loading margins enhancement. It is shown that best location for static voltage stability margin is the “weakest bus” of the system. Continuation power flow (CPF) is done with PSAT (power system stability analysis Toolbox).

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.

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 Enhancement of Voltage Stability by Using SVC for 30-Bus Power System

2019 ◽  
Vol 4 (2) ◽  
pp. 128-136
Author(s):  
Dara Hama Amin
Keyword(s):  
Power System ◽  
Voltage Stability ◽  
Reactive Power ◽  
Sensitivity Factor ◽  
Voltage Sensitivity ◽  
Voltage Profile ◽  
Voltage Level ◽  
Facts Devices ◽  
Before And After ◽  
The Stability

Voltage stability refers to maintaining the value of the voltage in all busses of the electric network at a steady level (initial operating point) during any sudden disturbance. Voltage instability may happen due to an increase in the demand of the load or in case of any change in the reactive power, thus, the system will go into uncontrollable and unstoppable decline in the voltage level. The effect of Static Var Compensator (SVC) on voltage stability is discussed in the paper, as well as the improvement of the voltage profile. Usually, SVC and FACTS devices were used for enhancing the voltage level profile and so the stability. Choosing the optimal location for the FACTS devices is essential due to its expensive costs. This paper used sensitivity factor to helpful to determine the most correct placement of FACTS devices in the system. Simulations are performed on Kurdistan Region 30-bus Power System using MATLAB-PSAT tool. As a result, the voltage of all 30 buses calculated. Based on the “voltage sensitivity factor”, the nominated weak buses has been marked which are suitable for placing the FACTS devices in order to improve the limits of the voltage stability of the system. Moreover, depending on the obtained optimal locations, a full analysis of the voltage and powers for the system has applied in two cases, before and after placing SVC respectively which is result in notable stability improvement and losses reduction.

Power System Loadability Maximization by Optimal Placement of Multiple-Type FACTS Devices Using PSO Based GUI

2014 ◽  
Vol 984-985 ◽  
pp. 1286-1294
Author(s):  
R. Arun Prasath ◽  
M. Vimalraj ◽  
M. Riyas Ahamed ◽  
K. Srinivasa Rao
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Reducing Power ◽  
System Stability ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Facts Devices ◽  
Ac Transmission ◽  
Multiple Type

This paper presents a graphical user interface (GUI) uses Particle Swarm Optimization (PSO), which is used to find the optimal locations and sizing parameters of multi type Flexible AC transmission systems (FACTS) devices in complex power systems. The GUI toolbox, offers user to choose a power system network, PSO settings and the type and number of FACTS devices for the selected network. In this paper, three different FACTS devices are implemented: SVC, TCSC and TCPST. FACTS devices are used to increase the system loadability, by reducing power flow on overloaded lines, transmission line losses, improving system stability and security. With this can make the transmission system more energy-efficient. PSO used here for optimally allocating and sizing the multiple type FACTS in a standardized power network (IEEE 30 bus system) in order to improve voltage profile, minimizing power system total losses and maximizing system loadability with respect to the size of FACTS.

scholarly journals Improvement the voltage stability margin of Iraqi power system using the optimal values of FACTS devices

2021 ◽  
Vol 11 (2) ◽  
pp. 984
Author(s):  
Ghassan Abdullah Salman ◽  
Hatim G. Abood ◽  
Mayyadah Sahib Ibrahim
Keyword(s):  
Power Systems ◽  
Power System ◽  
Voltage Stability ◽  
Stability Margin ◽  
Voltage Collapse ◽  
Voltage Profile ◽  
Heavy Load ◽  
Transmission Grid ◽  
Facts Devices ◽  
Voltage Stability Margin

The detection of potential voltage collapse in power systems is essential to maintain the voltage stability in heavy load demand. This paper proposes a method to detect weak buses in power systems using two stability indices: the voltage stability margin factor (dS/dY) and the voltage collapse prediction index (VCPI). Hence, the paper aims to improve the voltage stability of Iraqi transmission grid by allocating FACTS devices in the optimal locations and optimal sizes. Two types of FACTS are used in this paper which are Thyristor controlled series compensator (TCSC) and static var compensator (SVC). The objective function of the problem is fitted using particle swarm optimization (PSO). The proposed method is verified using simulation test on Diyala-132 kV network which is a part of the Iraqi power system. The results observed that improvement the voltage stability margin, the voltage profile of Diyala-132 kV is increased and the power losses is decreased.

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