With the growing demand of electricity, at times, it is not possible to erect new lines to face
the situation. Flexible AC Transmission System (FACTS) uses the thyristor controlled
devices and optimally utilizes the existing power network. FACTS devices play an important
role in controlling the reactive and active power flow to the power network and hence both
the system voltage fluctuations and transient stability. This paper proposes the Unified
Power Flow Controller (UPFC) as a power electronic based device that has capability of …

Problem statement: The enhancement of transient stability of the power system is one of the
most challenging research areas in power engineer. Approach: This study presents the
method to enhance transient stability of power system by Unified Power Flow Controller
(UPFC). The mathematical model of power system equipped with a UPFC is systematically
derived. The parameters of UPFC are modeled into power flow equation and thus it is used
to determine control strategy. The swing curves of the three phase faulted power system …