Abstract—A critical factor effecting power transmission system is the power flow control. To regulate the power flow control in power transmission line unified power flow controller (UPFC) is used. The UPFC is represented with two voltage sources named Voltage Source Model (VSM), which is used to study the behaviour of the UPFC in regulating the active, reactive power and voltage profile in the system. These VSM is incorporated in Newton Raphson (N-R) algorithm for load flow studies. The equations of UPFC and the power balance equations of network are combined in to one set of non-linear algebraic equations by employing Simultaneous method and is calculated according to the Newton raphson algorithm; Performed on the IEEE 30-bus system. Simulation is done in Matlab. The results are compared with and without UPFC in terms of active and reactive power flows in the line and active and reactive power flows at the bus to analyze the performance of UPFC.

Index Terms—Newton-Raphson algorithm, Load flow, Unified power flow controller, Voltage source model

Cite: G Sivaprasad and K Rama Mohan Reddy, "OPTIMAL POWER FLOW USING UNIFIED POWER FLOW CONTROLLER (UPFC)," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 1, No. 1, pp. 105-115, October 2012.