Study On Direct Torque Control For VSCF Brushless Doubly-fed Wind Power Generator

Now, energy sources consume increasing daily and environment empoison being serious gradually, wind power is paid great attention by more and more countries because of its stand out excellence, the Direct Torque Control technology of the Variable-speed constant-frequency (VSCF) Brushless Doubly-fed Generator (BDFM) is paid attention more and more for its high efficiency and practicability. First, this dissertation analyzes BDFM operation theory, including mathematic model of BDFM, coordinate transformation, the electromagnetic equation, power equation and torque equation can be achieved in the Control Winging (CW) reference frame, which establishes the theoretical foundation for succeeding study. After studying the Brushless Doubly-fed Generator DTC technology, a simulation based on DTC approximation circle flux control method has been done by MATLAB/Simulink. Simulation results show that the proposed control strategy is reasonable and feasible.