This paper proposes a high-order sliding mode control strategy to improve the performance of power decoupling control for double-fed induction generators (DFIG). Initially, the mathematical model of DFIGs is analyzed based on the principle of voltage-oriented vector control. DFIGs efficient operation is vital for grid stability and power quality. However, these generators are susceptible to disturbances and uncertainties, which can affect their performance. To address this issue and poor dynamic performance of traditional control methods in achieving power decoupling and the nonlinearity of the wind turbine model, the proposed control method utilizes high-order sliding mode controller using power function approaching law. Simulation results demonstrate that the proposed control approach outperforms traditional PI controllers in terms of accuracy, robustness, and dynamic and static performance. A series of experiments, including no-load grid connection and power decoupling control, were successfully conducted on this platform. Analysis of the experimental waveforms for independent adjustment of active and reactive power shows that when either the active or reactive power is independently changed, the other power remains relatively constant. Therefore, the experimental results verified that the grid-connected power control strategy of the system can achieve dynamic decoupling control between active and reactive power.