Based on the analysis of the operating characteristics of wind turbine and the power relations of doubly-fed machine, a power calculation model of stator maximum power at any wind speed, whose input variable is the generator angular speed and output variable is the stator power reference value, is proposed in this paper. Then, by using the close-loop control method, whose reference variable is the stator active power of generator stator and the feedback variable is the stator actual active power, the control system automatically tracks the maximum power point via the power equilibrium without wind speed detecting equipment. In order to regulate the active and reactive power precisely, the field-oriented control technology is applied to decouple the active and reactive power of generator and, thereby, the feed-forward algorithm is also applied to eliminate the cross coupling component of rotor current. The simulation research is carried out using Matlab 7.5 and experiment research is carried using DSP 2407. The result of experiment and simulation testify the feasibility and security of the strategy proposed in this paper.
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