I. Introduction
IN the last years, wind energy sources for electric power generation have shown the great utility. Recently, research on large grid-connected wind farm to the system has attracted significant amount of interests. However, Large wind farms connected to power grid bring new challenges to power systems planning and operating. The probabilistic load flow (PLF) calculation for wind power integrated system has been commonly used as an efficient tool to assess the impact of wind power on grid operation. A great concern in PLF analysis was shown on modeling a wind farm with induction generation.