Performance evaluation of unified power flow controller using transient simulation

The unified power flow controller (UPFC) is a power electronic controller which can be used to control active and reactive power flows in a power transmission line the by injection of (variable) voltage in series and reactive current in shunt configuration. In this paper, the authors evaluate the performance of a control strategy for UPFC in which they control real power flow through a power line, while regulating the magnitudes of the voltages at its two ports using transient simulation. The real power reference is modulated in order to improve the damping of power swings in the line. The effectiveness of the UPFC with this control strategy is clearly brought out by the simulation study