In this paper, an integrated inertial control method is proposed, which combines the improved overspeed load shedding control with the descent control in virtual inertial control. According to the different frequency of the system, by inputting the variable load rejection coefficient, the load rejection control module can quickly output the power reference value and transfer the power tracking curve, so that the wind turbine has the power frequency response characteristics. By analyzing the influence of control parameters on the equivalent inertia of power system, a specific control model is designed. The simulation results show that the integrated inertial control method proposed in this paper can make the wind farm composed of DFIG respond to the change of system frequency faster and more effectively, and provide active power support for the system.<br>
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