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The brushless doubly-fed machine (BDFM) has prospect application in the wind energy conversion system (WECS) for its abilities of speed regulation and variable-speed constant-frequency. The decoupled control of the active and reactive power is crucial to the applications of the BDFM in WECS. The robust control strategy based on sliding mode theory is applied for the independent control of active and reactive power of the BDFM. The controller is designed through the Lyapunov stable theory to ensure the stability of controller and achieve the required control result. The effect of the proposed method is tested with the matlab/simulink software. Simulation results illustrate the good performance of the controller and proves the power control strategy's feasibility.