TRANSIENT STABILITY IMPROVING OF POWER SYSTEM INCLUDING DFIG BASED WIND FARM BY USING FUZZY LOGIC CONTROLLER

With increased penetration of wind power on power Systems, the influences of wind power penetration on an existing interconnected large power system dynamic behavior, especially the transient stability analysis, must be considered carefully. Among the rest, Inter-area oscillations can be deteriorating the power system condition. These oscillations are as a result of the dynamics of inter-area power transfer in a large interconnected power network, which can seriously limit the system operation. To provide a safe operation for power system stability, damping of these oscillations have become one of the main problems. In this paper, a fuzzy logic controller is developed for a Doubly-Fed Induction Generator (DFIG) based wind farm in order to damp the inter-area oscillations. The auxiliary fuzzy damping controller modulates the reactive power in rotor side converter to accomplish the best damping of oscillations. In order to validate the claims the wellknown two-area four-machine power system aggregated with DFIG is simulated using Matlab/Simulink. Simulation results disclose that, the DFIG enhanced with fuzzy damping controller is more robust and effective for damping the electromechanical oscillations. Also a comparison between proposed controller and conventional PI controller is performed that exhibits the superior performance of Fuzzy logic controller toward its conventional PI controller.