Direct power control (DPC) is widely used in renewable power generation due to the advantages of simple implementation and fast dynamic response. An improved non-phase-locked-loop (non-PLL) DPC of doubly fed induction generator (DFIG) is proposed, which is implemented in the two phase stationary reference frame. In order to deal with the time varying characteristics of active and reactive powers for a DFIG in the stationary reference frame, the modulated active and reactive voltages are introduced. By this means, the time varying voltage matrix related dynamics of DFIG active and reactive powers are changed into a constant coefficient related equation, thereby simplifying the design of implementation system. Meanwhile, the modulated rotor voltage can be obtained from the modulated active and reactive voltages based on DFIG rotor position angle. Then, a linear controller can be introduced to achieve the decoupling regulation and fast tracking of active and reactive powers. Finally, the experimental results confirm the effectiveness and frequency adaptability of the proposed method.