Control Strategy And Character Analysis For VSCF Doubly-fed Wind Power Generator

The physical model of varied speed constant frequency doubly-fed induction generator under the varied coordinate system is described in detail.The T-shaped generator equivalent circuit of the generator is given and its power flow, torque regulation, active power regulation, reactive power regulation and so on is analyzed in this paper. Also the operation character and workspace of wind turbine is discussed in this paper.Furthermore, under the vector control strategy of stator field-orient, a vector control model is derived from the generator, which forms a close control system with the system can achieve the greatest wind energy capture and at the same time can realize the decoupling of the active and reactive power control system. the paper use a fuzzy logic controller to set the reference speed of the generator by judging the change trend of the wind energy capture and make the wind turbine operate at the very speed to achieve the greatest wind energy capture and also introduces a fuzzy logic controller to regulate the reactive power to reduce the loss as much as possible. The whole system model is founded in Matlab/simulink and the simulation proves the effectiveness of the control strategy.