Abstract:

Flexible AC Transmission System (FACTS) devices are preferred for steady state and transient state of power systems. Unified Power Flow Control (UPFC) has best control capability among FACTS devices. While UPFC controls bus voltages depending on reactive power, it controls the transmission line according to impedance and current. In this paper, static and dynamic voltage stability analyzes of UPFC were tested in the International Electric Electronic Engineering (IEEE) 14 bus power system. Fuel cell, which is a kind of Energy Storage System (ESS) devices, was used together with UPFC to improve the voltage stability operating limits for the steady state and transient state and to keep the system in the stable region. Besides, the voltage-maximum loading parameter values of the system, the bus voltage profiles were analyzed with the UPFC-EDS. In case of using UPFC and fuel cell together, it was observed that the loading parameter value of the system increased and the bus voltage profiles improved.

Keywords: