Abstract: Any line outage will lead to other lines overloading when the wind farm grid connection lines does not meet the N-1security constraints.Considering cluster grid connected wind farms characteristics,this paper analyzes the impact of the wind farm’s low voltage ride through（LVRT）capability and short-term fluctuations on the traditional overload control scheme first,and then proposes a new generator tripping scheme on overload considering the trend of wind farm output.The trend is analyzed by using numerical method,optimizing tripping machine object dynamically,making overload control more efficient and reducing the chance of wind farm grid connection lines overloading.The method will enhance the wind farms transmission corridor safety and reliability.