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Now a day, electricity demand is increasing in a huge rate due to the modernization of electrical equipment. In the other hand, due to the restrictions in the construction of new transmission lines, there is a possibility of create congestion in the existing transmission lines. As a result, blackout in the system may occur. To avoid this critical condition, electrical transmission and distribution companies try to develop some mechanism or technique to increase power flow capacity or the thermal limit of the existing system. For the said purpose the Flexible AC Transmission System (FACTS) devices are considered as the most flexible and feasible option to vary the line flow in an electrical system. This paper presents the background study, construction and application of FACTS devices with different techniques for optimal location of FACTS devices in the system.
Das et al. (Wed,) studied this question.