In recent power system scenario, the main concern is about the maximum power transfer capability from generating station to the distribution station. But between these, the transmission system i.e. transmission of power from generating station to distribution grid is the most vital thing. So in order to have a reliable and quality power transmission FACTS controllers (Flexible AC Transmission System) are introduced in the transmission system. FACTS are an emerging technology which motivates towards power quality improvement and increased control flexibility of power system. Generally FACTS controllers are of series type, shunt type and combined series-series and combined series-shunt type. In this paper a shunt type controllers i.e. STATCOM (Static Synchronous Compensator) and a SVC (Static VAR Compensator) have been considered. Here the variation of voltage and reactive power by the introduction of STATCOM & SCV at middle of long transmission line has been investigated. All these analysis is carried out by the mat lab simulink models of STATCOM & SVC. This comparison output revels that STATCOM performs better than SVC in Volt /VAR control.

FACTS, power quality, STATCOM, SVC

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