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Generalized interline power-flow controller (GIPFC) is one of the voltage-source controller (VSC)-based flexible AC transmission system (FACTS) controllers that can independently regulate the power-flow over each transmission line of a multiline system. This paper presents the modeling and performance analysis of GIPFC based on 48-pulsed voltage-source converters. This paper deals with a cascaded multilevel converter model, which is a 48-pulse (three levels) voltage source converter. The voltage source converter described in this paper is a harmonic neutralized, 48-pulse GTO converter. The GIPFC controller is based on d-q orthogonal coordinates. The algorithm is verified using simulations in MATLAB/Simulink environment. Comparisons between unified power flow controller (UPFC) and GIPFC are also included. Keywords: Generalized interline power-flow controller (GIPFC), Voltage source converter (VCS), 48-pulse GTO converter