From the beginning of mathematics model of doubly fed generator, the excitation control for stand-alone doubly fed generator was remade that based on forced stator-flux-oriented control strategy, ensure that the stand-alone doubly fed generator work properly at constant voltage constant frequency(CVCF) operation. Technical ideas: Control the frequency of stator voltage by adjusting the rotating frequency of the rotor magnetic field. Adjust the rotor flux amplitude for controlling the stator internal potential. By controlling the switches, ensure the stand-alone doubly fed generator running by itself at CVCF operation. A model was build that simulated in the Matlab/Simulink, the results show that the control strategy is feasible.