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UPFC元件作为一种功能强大的FACTS器件正日益受到广泛的研究和重视，并有望在未来几年内投入实际运行。就其在应用中首先面临的问题即安装地点问题进行研究，在限定UPFC个数的情况下，以总容量成本最小为目标，通过目标潮流寻求电力网络中的最优环路集，并以其中的最佳连支作为UPFC的最佳安装地点。
UPFC components as a powerful FACTS devices are increasingly widely studied and valued, and is expected to put into operation in the next few years. In this paper, the first problem in the application, namely, the installation site, is studied. When the number of UPFCs is limited, the optimal total cost set in the power network is obtained through the target power flow. The best connection as UPFC the best place to install.