Abstract: The latest development of Convertible Static Compensators (CSC) drives the importance of the Flexible AC Transmission System (FACTS) controllers to higher levels because of their controllable nature and effective power flow management of multi-line systems. There are several possibilities of operating configurations of FACTS devices by combing two or more converter blocks with flexibility. To realize the effect of CSC on a given power system, Interline Power Flow Controller (IPFC) is considered and Power Injection Model (PIM), Voltage Source Converter Model (VSM) and Hybrid Model for the same device is proposed in this thesis. The comfort in mathematical modeling and the incorporation procedure in Newton- Raphson load flow with these models increase its importance. Most of the literature concentrates on the voltage based controlled power flow using equivalent power injections. But the main contribution in this thesis is, to propose PIM, VSM and Hybrid models of IPFC to incorporate in NR load flow. By varying the device control parameters the variations in the system parameters is observed and are analyzed with the supporting results. Numerical results for HALE network and IEEE-30 bus systems without and with IPFC for the variation of device control parameters for each of the model are presented in detail. The obtained results show the performance of the proposed IPFC models.

Keywords: FACTS, IPFC, PIM, VSC, NR Load flow, IEEE – 30 Bus, MATLAB/SIMULINK