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- Recently, an SVC(Static Var Compensator) was installed at Seo-daegu substation in order to maintain the voltage level and reserve stability margin of the Korean Power System. This paper deals with the development of the simulation model for the Seo-daegu SVC. As a simulation platform, PSCAD/EMTDC is adopted and library components for the SVC are developed. The model includes detailed control system functions of Seo-daegu SVC. In order to verify the developed model, simulation results are compared with the TNA test performed by ABB. The results show a good agreement of the developed model with the real system.