Control for Maximal Wind Energy Tracing in Brushless Doubly-Fed Wind Power Generation System Based on Double Synchronous Coordinates

Using rotor d-p model as a start point, this paper analyses the mathematical model for brushless doubly-fed machine (BDFM) based on double synchronous reference frame. And, based on characteristics of BDFM, a new type of power control system is designed by applying flux oriented vector transformation control technology. This system realizes the decoupling control of active and reactive power of variable-speed constant-frequency (VSCF) generator by using the control windings of the generator to carry out the AC excitation. Meanwhile, because the generator structure is complex and the generator parameters are variable according to the environment, fuzzy control is used for the power loop of the outer loop to further enhance the robustness of the system. Thus high efficiency power generation is achieved through maximal wind energy capturing. Computer simulation results verify the correctness and effectiveness of this control strategy.