A FUZZY VARIABLE STRUCTURE CONTROLLER FOR TRANSIENT STABILITY ENHANCEMENT OF FLEXIBLE AC TRANSMISSION SYSTEM

2006 ◽  
Vol 26 (3) ◽  
Author(s):  
P.K. Dash ◽  
M.H. Naeem
Keyword(s):  
Transient Stability ◽  
Fuzzy Variable ◽  
Variable Structure ◽  
Transmission System ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Ac Transmission ◽  
Stability Enhancement

scholarly journals An Analysis of Transient Stability Enhancement Capability of UPFC in a Multi-machine Power System

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Shereefdeen Oladapo Sanni ◽  
Josiah Haruna ◽  
Boyi Jimoh ◽  
Usman Aliyu
Keyword(s):  
Power System ◽  
Power Flow ◽  
Transient Stability ◽  
Test System ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Generator Terminal ◽  
Ac Transmission ◽  
Stability Enhancement

This study presents the transient stability enhancement capability of Unified power flow controller (UPFC) as an effective Flexible AC Transmission System (FACTS) device in a multi-machine power system. The test system was a reduced Nigerian 330kV power system and the focus was on the effect of disturbances on the largest generating unit (Egbin) in the system. The analysis was conducted by simulating a 3-phase fault at two locations; on the terminal of the largest generator unit at Egbin bus and the bus with the largest load at Ikeja–west. The response of the system in both cases was compared with and without the device in operation. Simulations were carried out using the Power System Simulation for Engineering (PSS/E) software. Results showed that, with the UPFC in the network, system transient stability was enhanced considering that critical clearing time of the system was increased from 380ms to 590ms when the fault was at Egbin generator terminal and from 470ms to 510ms following the fault at Ikeja-west. In addition, the device was able to damp power oscillations resulting from the disturbance created by the faults.

scholarly journals MODELING OF 14 BUS SYSTEM WITH UPFC FOR TRANSIENT STABILITY ENHANCEMENT

2019 ◽  
Vol 5 (4) ◽  
pp. 8
Author(s):  
Vipin Kumar Pandey ◽  
Dr. Malaya Saurava Dash
Keyword(s):  
Power Flow ◽  
Transient Stability ◽  
Stable Operation ◽  
Power Flow Control ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Harmonic Elimination ◽  
Ac Transmission ◽  
Stability Enhancement ◽  
Bus System

The revolution of Power Electronics Technology has given opportunities for developing the FACTS devices for stable operation of power system. In the last two decades number of Power Electronic based devices are implemented and known as FACTS (Flexible AC transmission System).These devices are effectively used for voltage control, power flow control, harmonic elimination, damping oscillation and improving transient stability and minimization of losses. Static and Transient stability enhancement of IEEE 14 bus system is done with the help of UPFC. Fault is created at a bus and the results show that by properly placing UPFC, settling time of the system can be reduced considerably making the system stable with fewer oscillations.

Voltage Swell Mitigation Using Flexible AC Transmission Systems Based on Evolutionary Computing Methods

2014 ◽  
Vol 3 (3) ◽  
pp. 73-95 ◽  
Author(s):  
Marwa Shahin ◽  
Ebtisam Saied ◽  
M.A. Moustafa Hassan ◽  
Fahmy Bendary
Keyword(s):  
Particle Swarm Optimization ◽  
Steady State ◽  
Computing Methods ◽  
Transmission System ◽  
Swarm Optimization ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Voltage Swell ◽  
Ac Transmission ◽  
Bus System

The main subject of these paper deals with enhancing the steady-state and dynamics performance of the power grids by using new idea namely Advanced Flexible AC Transmission Systems based on Evolutionary Computing Methods. Control of the electric power system can be achieved by using the new trends as Particle Swarm Optimization applied to this subject to enhance the characteristics of controller performance. This paper studies and analyzes Advanced Flexible AC Transmission System to mitigate only one of power quality problems is voltage swell. The Advanced Flexible AC Transmission System, which will be used in this paper, is the most promising one, which known as Advanced Thyristor Controlled Series Reactors, and Advanced Static VAR Compensator were utilized in this research to mitigate the voltage swell aiming to reach. This paper focuses on the operation of the AFACTS device under turning off heavy load that may causes transformer damaged, as no research covers this problem by this technique. Particle Swarm Optimization is used to determine the value of series inductor connected to the Advanced Flexible AC Transmission System. The proposed algorithm formatting, deriving, coding and programming the network equations required to link AFACTS during steady-state and dynamic behaviors to the power systems tested on the IEEE 30 bus system as well as IEEE 14 bus system, and 9 bus system.

Congestion management in deregulated power system using hybrid cat-firefly algorithm with TCSC and SVC FACTS devices

2016 ◽  
Vol 35 (5) ◽  
pp. 1524-1537 ◽  
Author(s):  
Naraina Avudayappan ◽  
S.N. Deepa
Keyword(s):  
Power System ◽  
Congestion Management ◽  
Power Line ◽  
Transmission System ◽  
Optimal Placement ◽  
Content Type ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Facts Devices ◽  
Ac Transmission

Purpose The loading and power variations in the power system, especially for the peak hours have abundant concussion on the loading patterns of the open access transmission system. During such unconditional state of loading the transmission line parameters and the line voltages show a substandard profile, which depicts exaction of congestion management of the power line in such events. The purpose of this paper is to present an uncomplicated and economical model for congestion management using flexible AC transmission system (FACTS) devices. Design/methodology/approach The approach desires a two-step procedure, first by optimal placement of thyristor controlled series capacitor (TCSC) and static VAR compensator (SVC) as FACTS devices in the network; second tuning the control parameters to their optimized values. The optimal location and tuning of TCSC and SVC represents a hectic optimization problem, due to its multi-objective and constrained nature. Hence, a reassuring heuristic optimization algorithm inspired by behavior of cat and firefly is employed to find the optimal placement and tuning of TCSC and SVC. Findings The effectiveness of the proposed model is tested through simulation on standard IEEE 14-bus system. The proposed approach proves to be better than the earlier existing approaches in the literature. Research limitations/implications With the completed simulation and results, it is proved that the proposed scheme has reduced the congestion in line, thereby increasing the voltage stability along with improved loading capability for the congested lines. Practical implications The usefulness of the proposed scheme is justified with the computed results, giving convenience for implementation to any practical transmission network. Originality/value This paper fulfills an identified need to study exaction of congestion management of the power line.

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