移動式小型汽油發電機3000瓦The thesis fist provides an overview of the status and the developing prospect of wind power at home and abroad, and introduces the composition of the two control methods which is CSCF and VSCF and wind power system of doubly-fed type in wind power, and analyzes the mathematical model of doubly- fed generators under the three-phase static coordinate system and two phase rotation coordinate system. The thesis still analysis the relationship between the stator voltage, flux, power and torque, then described the basic principle of the double-fed motor based on stator flux vector control