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To avoid dealing with the zero dynamics limitation brought by the bidirectional power flow through the back-to-back converter in a doubly fed wind generator,a new energy-based modeling and control approach for the gridside converter is presented.During the modeling process,the grid-side converter is divided into two subsystems with the feedback interconnection structure,and the interactive matrix of the model takes into account the concrete port structure.Then,an energy-based controller is proposed to realize the grid-side control objectives based on the new model.Simulation studies are carried out in MATLAB/Simulink.Comparative results between the proportional-integral controller and the energy-based controller show that the latter one can obtain faster convergence rate and global stability as the load current varies.Moreover,the energy-based controller is also competent for grid-side control when simulated in a 2 MW wind energy conversion system with random wind.