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Application of UPFC to Increase Transient Stability of Inter-Area Power System

By Prechanon Kumkratug

Abstract

power electronic based device that has capability of controlling the power flow through the line by controlling appropriate its series and shunt parameter. It has been reported that UPFC can improve transient stability of a simple system. This paper investigates the improvement of transient stability of inter-area power system. The mathematical model of UPFC is present in this paper. The UPFC is modeled as the variable susceptance and is incorporated into the model of power system. The simulation results are tested on the Kundur’s inter-area power system. Index Terms—power system, transient stability, FACTS, UPFC, inter-area power system. injected active power must be supplied by the DC link, in turn taken from the AC system through the shunt converter. The shunt converter also has a capability of independently supplying or absorbing reactive power to regulate the voltage of the AC system. When the losses of the converters and the associated transformers are neglected, the overall active power exchange between the UPFC and the AC system become zero. However, both the series and shunt converters can independently exchange reactive power [3]. UPFC can improve both steady sate stability, dynamic stability and transient stability [4-5]. For the convenience practical of application, the series voltage angle of UPFC is kept in perpendicular with a line current [6]. I

Year: 2009
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