Using UPFC in order to Power flow control

This test case is made to verify the current injection model of the UPFC. The UPFC is installed in a sample network. Then a fault study apply to this network by monitoring active power flow in the faulted line for the system with and without the UPFC. The parameters of the UPFC are chosen based on static behavior of the UPFC. With the control of the variables r and gamma, improvements in damping of the oscillations are shown obviously .The general form of the UPFC control system has been proposed. The UPFC should operate in the automatic power flow control mode keeping the active and reactive line power flow at the specified values. This can be achieved by the linearizing the line power flow. Figures show the first preliminary results of the proposed control method if the specified value of the active and reactive power be chosen .An alternative control strategy for the UPFC is based on the series voltage injected by the UPFC. If this injected voltage is instantaneous by the UPFC, the components can be related to the control variables r and gamma. The further studies will investigate these control methods with respect to performance and robustness.