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Because of the randomness and intermittent of wind power, how to actively engage in the active control of wind farm and improve the active power output of wind farm is the subject which wind farm are very concerned about. First, the article discusses the active control principle, objectives and requirements for wind farm, putting forward to the active control strategy based on wind turbines dynamic classified for wind farm. Wind turbines is classified according to the power prediction of wind turbines and the optimization model is established for active power distribution of wind farm, which promote to the accuracy of the active control in the entire wind farm. Then, the active control strategy proposed is applied to the actual wind farm power control, finding the shortcoming of control strategy and suggesting improvement, finally Verifying the feasibility and effectiveness of the strategy.