Voltage Stability Improvement using Static Var Compensator in Power Systems
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08-02-2010, 11:38 AM



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Voltage Stability Improvement using Static Var Compensator in Power Systems

Abstract This paper investigates the effects of Static Var Compensator (SVC) on voltage stability of a power system. The functional structure for SVC built with a Thyristor Controlled Reactor (TCR) and its model are described. The model is based on representing the controller as variable impedance that changes with the firing angle of the TCR. A Power System Computer Aided Design /Electromagnetic Transients including DC (PSCAD/EMTDC) is used to carry out simulations of the system under study and detailed results are shown to access the performance of SVC on the voltage stability of the system.

Presented By:

Mark Ndubuka NWOHU
Department of Electrical/Computer Engineering, Federal University of Technology, Minna,
Niger State, Nigeria

Introduction Todayâ„¢s changing electric power systems create a growing need for flexibility, reliability, fast response and accuracy in the fields of electric power generation, transmission, distribution and consumption. Flexible Alternating Current Transmission Systems (FACTS) are new devices emanating from recent innovative technologies that are capable of altering Voltage Stability Improvement using Static Var Compensator in Power Systems Mark Ndubuka NWOHU 168 voltage, phase angle and/or impedance at particular points in power systems. Their fast response offers a high potential for power system stability enhancement apart from steadystate flow control. Among the FACTS controllers, Static Var Compensator (SVC) provides fast acting dynamic reactive compensation for voltage support during contingency events which would otherwise depress the voltage for a significant length of time. SVC also dampens power swings and reduces system losses by optimized reactive power control. Power System Computer Aided Design/Electromagnetic Transients Direct Current (PSCAD/EMTDC) has been used in this paper to conduct simulations on voltage regulation at the point of connection of SVC to the system. However, the aim of this paper is to enhance voltage stability using Static Var Compensator at the event of occurrence of fault in the system.
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