Advanced power flow control for multiple Flexible Alternative Current Transmission System (FACTS) devices is described here. An installation of multiple FACTS devices offers a great advantage concerning the flexibility of a system-wide power flow control. However, their individual unco-ordinated control actions may cause mutual negative effects. Therefore, a control tool for multiple FACTS devices capable of managing system congestions in a continuously changing deregulated environment has been developed. The controller prototype has been tested using simulation software for power systems in order to assess its performance considering different scenarios. As an example, the Swiss power system has been used in this paper.