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delay compensator is finally shown for a wide range of signal transmission delays. The designed SVC controller shows a superior performance in damping the inter-area oscillations despite the signal transmission delays. KEYWORDS: power system damping, Static Var Compensator (SVC), Flexible AC Transmission Systems (FACTS), Phasor Measurement Unit (PMU), wide area measurement (WAM) 1. Introduction Electromechanical oscillation (0.1 to 2.0 Hz) is a phenomenon inherent to power systems [1]. There are mainly two types of electromechanical oscillations involved in power

in a Power System Network Baskaran Jeevarathinam Abstract The flexible AC transmission system (FACTS) in a power system improves the stability, reduces the losses, reduces the cost of generation and also improves the loadability of the system. In the proposed work, a non-traditional optimization technique, a Genetic Algorithm (GA) is conjunction with Fuzzy logic (FL) is used to optimize the various process parameters involved in introduction of FACTS devices in a power system. The various parameters taken into consideration were the location of the device, their

Enhancement Ramnarayan Patel, Vasundhara Mahajan, and Vinay Pant Abstract Power engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. Flexible AC Transmission system (FACTS) controllers can balance the power flow and thereby use the existing power system network most efficiently. Because of their fast response, FACTS controllers can also improve the stability of an electrical power system by helping critically disturbed generators to give away the excess energy gained through the acceleration during fault

References [1] HINGORANI, N. G. : Power Electronics in Electric Utilities: Role of Power Electronics in Future Power Systems, Proceedings of the IEEE Special Issue 76 No. 4, (Apr 1988), 481-482. [2] HINGORANI, N. G. : Flexible AC Transmission Systems (FACTS) - Overview, IEEE Spectrum 30 No. 4 (Apr 1993), 40-45. [3] XU, L-AGELIDISV. G.-ACHA, E. : Development Considerations of DSP-Controlled PWM VSC-based STATCOM, IEE Proc-Electr. Power Appl. 148 No. 5 (Sep 2001), 449-455. [4] SCHAUDER, C.-MEHTA, H. : Vector Analysis and Control of Advanced Static var Compensator

Using Multi-Objective Optimal Power Flow and Genetic Algorithms," International Journal of Emerging Electric Power Systems: Vol. 7: Iss. 2, Article 1. DOI: 10.2202/1553-779X.1099 Optimal Allocation of FACTS Devices by Using Multi-Objective Optimal Power Flow and Genetic Algorithms Lucio Ippolito, Antonio La Cortiglia, and Michele Petrocelli Abstract The increases in power flows and environmental constraints are forcing electricity utilities to install new equipment to enhance network operation. Some application of Flexible AC Transmission System (FACTS) technologies

presented for the self-tuning of a voltage source converter (VSC) based Flexible AC Transmission Systems (FACTS) according to the prevailing system condition. L-index, which is a power system voltage stability status indicator, and its associated parameters are used to automatically regulate the modulation signal of the VSC. This will lead to a proportionate adjusting of the magnitude of the current injected into, or absorbed from, the interconnected load bus by the FACTS device. This regulating scheme will enhance seamless and optimal reactive power compensation by

-IEEE Press, Piscataway, New Jersey, 2002. HINGORAN, N. G.—GYUGYI, L.: Understanding FACTS, Wiley-IEEE Press, Piscataway, New Jersey, 2000. SONG, Y. H.—JOHNS, A.: Flexible AC Transmission Systems (FACTS), IEE Power Engineering Series 30, London, 1999. HIGNORANI, N. H.: Flexible AC Transmission Systems, IEEE Spectrum (Apr 1993), 40-45. EDRIS, A. S.—MEHRABAN, M.—RAHMAN, L.—GYUGYI, S. A.—REITMAN, T.: Controlling the Flow of Real and Reactive Power, IEEE Computer Appl. in Power (1998), 20-25. GE, S. Y.—CHUNG, T. S.: Optimal Active Power Flow Incorporating Power Flow Control

lines and/or extending of existing substations may be too costly and time- consuming, concessions for new rights-of-way may be hard or impossible to come by, and last but not least, there may be serious obstacles in the way from an ecological point of view [4]. From technical, economical and environmental points of view, there are two important -and most of the time combined- alternatives for building new transmission or distribution networks to enhance the transmission system capacity, and power quality: 1- The Flexible AC transmission systems (FACTS

the initiative to develop new Flexible AC Transmission System (FACTS) controllers and demonstrate their potential benefits in the operation of power system [3]. The addition of faster power electronics based devices to power systems, while providing control benefits, also means that higher-frequency interactions between these devices and the power system and among the devices themselves become more pronounced and the possibility of any adverse interactions needs to be carefully studied [4,5,6]. This paper is organized as follows. The theory of HVDC and SVC

conventional, economical and effective solutions is to install the power system stabilizer (PSS) [ 1 , 2 ]. However, the use of PSSs only may not be, in some cases, effective in providing sufficient damping for power oscillations, specifically for long-distance power transmission. An alternative solution is to use flexible AC transmission systems (FACTS) controllers. FACTS damping controllers are feasible due to the application of high-power electronic devices for power flow, voltage control and additionally enhancing the damping of power oscillations [ 3 ]. Among the FACTS