Reactive Power Loss Sensitivity Approach in Placing FACTS Devices and UPFC

In this paper, a simple placement technique of Flexible AC Transmission System (FACTS) devices and Unified Power Flow Controller (UPFC) is proposed for loading margin enhancement. Reactive-power loss sensitivity approach is proposed to identify the weakest line of the system and to narrow down the appropriate site of FACTS device. The combination of Reactive-power loss sensitivity and Tangent Vector is proposed to find the appropriate location of UPFC. Proper modeling of FACTS devices, including DC side, is used to accurately capture their behaviors when they are operating at limits. The proposed placement approach may be useful for utilities who wish to find appropriate location of FACTS devices and UPFC regarding to loading margin enhancement.