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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

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

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

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

in der Regel aus anderen netztechnischen oder -wirtschaftlichen Gründen ohnehin sinnvoll bzw. erforderlich sind. Regelbare Betriebsmittel in Flexible AC Transmission Systems (FACTS-Geräte) bieten je nach Ausführung u. a. die Möglichkeit, Wirk- und Blindleistungsflüsse zu steu- ern, lastprofilabhängige Spannungsschwankungen zumi- nimieren, die Stabilität zu verbessern und somit spezi- ell auch Leistungspendelungen durch netzseitige Leis- tungsmodulation imEinflussbereich desNetzbetreibers zu dämpfen, insbesondere imHinblick auf den Interarea Mo- de [5, 21, 64]. Das

turbine generator features may affect the system dynamics and participate in both voltage and frequency control and deviations. Furthermore, improving the reactive power limits of the system requires urgently a remedy for prevention of voltage’s instability and collapse. Analysis per- formed using PSAT prove that Flexible AC transmission System (FACTS) devices can be considered as efficient controllers for the growth of the system’s loadability margin that is tested by utilizing the Continuation Power Flow (CPF) technique. Compared to other controllers, the most

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