Comparison of FACTS Devices for Power System Stability Enhancement

International Journal of Computer Applications (Impact Factor: 0.82). 10/2010; DOI: 10.5120/1198-1701
Source: DOAJ

ABSTRACT 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.

Download full-text


Available from: M. Rajaram, Oct 06, 2014
  • Source
    IEEE Transactions on Power Systems 01/2015; DOI:10.1109/TPWRS.2015.2389822 · 3.53 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    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.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents initial project and test results of an active power control scheme development for auxiliary synchronous generators of an AES-Distribution System connected Hydraulic Generation Unit. An open loop control system using TCSC switched by IGBT's is proposed to compensate the inductive impedance of the synchronous generator and control the active power injection. Several switching angles were evaluated at different compensation levels and simulations are presented to analyze the effectiveness and robustness of the proposed controller project.
    Power and Energy Society General Meeting, 2012 IEEE; 01/2012