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Variable speed constant frequency (VSCF) doubly fed wind power generation system, which is mainly composed of doubly fed induction generator (DFIG), excitation control system and wind turbine, is a complicated system of electromechanical energy transformation and control. It is quite necessary to study system modeling and simulation of the VSCF doubly fed wind power generation system. Unified control model of VSCF doubly fed wind power generation system is established in this paper based on stator flux orientation vector control, which not only directly reflects structure parameters of DFIG and wind turbine, excitation parameters, and the relationship between variable pitch control and output power, but also indicates in theory that the running characteristics of DFIG and the technical superiority for being used in VSCF wind power generation system. System control model of output power control strategy of VSCF doubly fed wind power generation system which running at different wind speed is established with computer simulation. Simulation results indicate that the established unified control model is brief, instinctive and feasible, which conduces to the theoretical study on application systems of DFIG and to the design on excitation control system.

System Modeling and Simulation of a Wind Power Generation with Doubly Fed Induction Generator