Comparison of FACTS Devices for Power System Stability Enhancement

International Journal of Computer Applications 10/2010; 8(4). DOI: 10.5120/1198-1701
Source: DOAJ


The development of the modern power system has led to an increasing complexity in the study of power systems, and also presents new challenges to power system stability, and in particular, to the aspects of transient stability and small-signal stability. Transient stability control plays a significant role in ensuring the stable operation of power systems in the event of large disturbances and faults, and is thus a significant area of research. This paper investigates the improvement of transient stability of a two-area power system, using UPFC (Unified Power Flow Controller) which is an effective FACTS (Flexible AC Transmission System) device capable of controlling the active and reactive power flows in a transmission line by controlling appropriately its series and shunt parameters. Simulations are carried out in Matlab/Simulink environment for the two-area power system model with UPFC to analyze the effects of UPFC on transient stability performance of the system. The performance of UPFC is compared with other FACTS devices such as Static Synchronous Series Compensator (SSSC), Thyristor Controlled Series Capacitor (TCSC), and Static Var Compensator (SVC) respectively. The simulation results demonstrate the effectiveness and robustness of the proposed UPFC on transient stability improvement of the system.

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Available from: M. Rajaram, Oct 06, 2014
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    • "IGH voltage direct current (HVDC) systems use direct current for bulk electric transmission power based on high power electronics which provide the opportunity to enhance controllability, stability and power transmission capability of AC transmission systems [1]. Practical conversion of power between AC and DC became possible with the development of power electronics devices such as thyristors and voltage source converters (VSC). "

    IEEE Transactions on Power Systems 01/2015; DOI:10.1109/TPWRS.2015.2389822 · 2.81 Impact Factor
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    • "In this chapter some selected research papers related to two area power system stability enhancement using FACTS controllers are reviewed as:- D. Murali, et al. presents the new challenges to power system stability and in particular transient stability and small signal stability for two area power system [2]. They investigate the improvement of transient stability for two area power system with effective use of different types of FACTS controllers. "
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    ABSTRACT: Modern Power Transmission networks are becoming increasingly stressed due to growing demand and restrictions on building new lines. Losing stability is one of the major threat of such a stressed system following a disturbance. Flexible ac transmission system (FACTS) devices are found to be very effective in a transmission network for better utilization of its existing facilities without sacrificing the desired stability margin. The static synchronous compensator (STATCOM) and Static Var Compensator (SVC) are the shunt devices of the flexible AC transmission systems (FACTS) family. When system voltage is low, STATCOM generates reactive power and when system voltage is high it absorbs reactive power whereas the Static Var compensator provides the fast acting dynamic compensation in case of severe faults. In this Paper, the performance of SVC is compared with the performance of STATCOM. Proposed controllers are implemented using MATLAB/SIMULINK. Simulation results indicate that the STATCOM controller installed with two machine systems provides better damping characteristics in rotor angle as compared to two machine system installed with SVC. Thus, transient stability enhancement of the two machine system installed with STATCOM is better than that installed with SVC.
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    • "SSSC is a member of FACTS family which is connected in series with a power system. It consists of a voltage source converter which injected a controllable alternating current voltage at fundamental frequency and DC capacitor as storage unit [3]. Although the main function of SSSC is to control of power flow but it can is used to control of dynamic stability of power system [4]. "
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    ABSTRACT: This paper presents a novel method for damping of low frequency oscillations (LFO) based on design of a state feedback controller for synchronous series compensator (SSSC) in a power system. The design problem of state feedback damping controller is formulated as an optimization problem to minimize a time domain based objective function by improved chaotic–harmony search (IC-HS) technique. Some modifications in harmony search algorithm are made for improvement of algorithm convergence. In fact, this paper focuses on coordinating of SSSC's inputs with together and coordination of power system stabilizer (PSS) with SSSC's inputs to find the best dynamic response. Single Machine Infinite Bus (SMIB) system has been considered to examine the operation of proposed controllers. Change of the input power of generator abruptly, is considered as a disturbance. The effectiveness of the proposed state feedback controller has been demonstrated by nonlinear time domain simulation studies. The results analysis show that the proposed controller can provide the excellent capability in fast damping of power system oscillations and improve greatly the dynamic stability of power system. In addition, the system performance analysis and surveys under various operating conditions demonstrate that the simultaneously coordination of SSSC's input controllers are superior to the PSS based damping controller.
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