Power control methods of doubly-fed wind power generation sets were researched in order to realize power adjustment under full wind speed condition. Maximum power point tracking control based on tip speed ratio was adapted under the rated wind speed and maximum wind energy capture was realized; variable pitch angle control method was applied to system above the rated wind speed and output power was kept constant to ensure whole system safe and stable operation. Simulation by MATLAB shows that the double-fed induct generator sets achieved effective adjustment of output power in a large wind speed variation section, and the system keep good stability when the two power adjustment methods switched.