Congestion Management Using Coordinated Control of FACTS Devices and Load Shedding

The development of a control system and control strategies capable of governing multiple flexible AC transmission system (FACTS) devices in coordination with a load shedding is described here. The main purpose of the presented coordinated control system is to remove overloads caused by unplanned line outages in transmis- sion network. A sensitivity analysis was used to find out an intercoupling between a variation of set points of different FACTS devices and a volume of load shedding with a variation of active power flow in transmission lines. The proposed control system is based on linearized expressions in steady state. Therefore, a coordinated control process does not require intensive computations. A prototype of the coordinated control system is suitable for a real time implementation. It constantly monitors power flows in a test transmission network and generates appropriate con- trol signals to each load and FACTS device in order to maintain an admissible power flow level. It has been inter- faced with load flow software to test its effectiveness through non-linear simulations using the IEEE 30 bus test power system as the study case. The results obtained are discussed.