Vector control and synchronization of brushless doubly-fed machine for high power wind power generation

In this paper, a novel variable-speed constant-frequency brushless doubly-fed induction generator (BDFIG) system using back-to-back multilevel converter for high power wind turbine is described. Based on analysis of power stator flux oriented vector control theory of BDFIG, an improved maximum power point tracking control strategy is explored. The paper specialty discusses the feasibility and advantage of a novel technique which should soft and fast synchronizing of BDFIG to the grid by using power stator voltage control method and disconnecting from the grid. Simulation results prove the feasibility and validity of the proposed model, theoretical analysis and excellent performance of the proposed control scheme.