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This paper presents dynamic modeling and simulation of Brushless Doubly Fed Induction Generator (BDFIG) as an alternative for variable speed wind power applications. The mathematic models of active and reactive power for BDFIG have been developed. The power control systems of a 75 kVA generator and wind turbine were simulated in Matlab/Simulink/SymPower Systems. The generator's control system is based on vector control principles which enable to decouple active and reactive power control. The BDFIG performance is compared to a wound rotor doubly fed induction generator. The power flow in the two generators systems and in the grid is analyzed and compared. The efficiencies of the two systems are compared.

The vector control of the Brushless Doubly Fed Induction Generator (BDFIG) was implemented in Matlab/Simulink/SymPowerSystems using a rotating reference frame fixed on the power winding flux. The control algorithms of the grid-side and control-side converters can regulate the active and reactive power independently. The measure of the power winding flux angle, realized using a Phase Locked Loop (PLL), showed good performance during the system startup and has demonstrated a robust behavior under noisy voltage and current signals. A synchronization strategy is proposed that acts on the control-side converter current control loops to ensure the conditions for a smooth connection. Soft and fast synchronization is achieved at the minimum rotating speed. The simulation results of the dynamic performance of Maximum Power Point Tracking (MPPT) under speed mode control are presented.