Placement and Setting Parameters of Unified Power Flow Controller for Congestion Management of Transmission Lines in Restructured Power Systems

Competition between producers and the contract's issues between the prouducers and consumers of electrical energy in the restructured power systems might cause on unwanted increase in power interchange beyond transmission line's capacity. As FACTS devices provide the condition and control possibility of effective parameter in transmission power at the level of transmission network, the use of such devices seems to be useful in congestion management. In this paper, AC optimal power flow in combination with UPFC has been used for congestion management of transmission network. A method based on genetic algorithm (GA) has suggested for determining appropriate setting of parameters and UPFC location. Power injection method has been used for UPFC modeling which includes UPFC losses. The results of simulation on five buses network indicate that the problems and limitations resulted from transmission lines capacity can be tackled in the presence of UPFC without rescheduling among generating units or even without any topological change in the network.