Study on Modeling of Unified Power Flow Controller

This paper makes a deep investigation on the model of the Unified Power Flow Controller (UPFC), which is the most vigorous component of FACTS. The modeling of the unified power flow controller (UPFC) for power flow, voltage, angle and impedance controls is presented. The control modes include power flow, voltage, angle and impedance control functions. The similarities and differences between some of the control modes and those of existing traditional transformers and series compensation devices are also discussed. The control modes were incorporated into a Newton-Raphson power flow algorithm. The numerical examples are given on the IEEE 30-bus system and the IEEE 118-bus system to illustrate the feasibility and the performance of the Newton-Raphson power flow algorithm.