In this research, a novel strategy for attenuating the output power fluctuation of the wind farm (WF) delivered to the grid is proposed, in which the kinetic energy caused by the large inertia of the wind turbine systems is utilized. A two-level control scheme is applied to control the wind farm, which consists of a supervisory control of the wind farm and individual wind turbine controls. The supervisory control produces the output power reference of the wind farm, which is filtered out from the available power extracted fromthe wind. For this control strategy, when the reference power is lower than the maximum available power, some of individual wind turbines are operated in the storing mode of the kinetic energy by increasing the turbine speeds. Then, these individual wind turbines release the power by  reducing the turbine speed, when the power command is higher than the available power. In addition, the pitch angle control systems of the wind turbines are also employed to limit the turbine speed not higher than the rated value during the releasing mode of kinetic energy. To release the power by decelerating the wind turbine, the boundary of the stable operation region is taken into account. The PSCAD/EMTDC simulations have been carried out for a 200-MW wind farm equipped with the permanent-magnet synchronous generator (PMSG) to verify the validity of the proposed method.