Research on no-load grid-connection control strategy for doubly-fed wind power system

With the single unit capacity of wind power is increasing, the grid-connection impact current can´t be neglected now, that the grid-connection control technology should be had an in-depth study. In this paper the vector control based on the stator flux-oriented is transplanted to the grid-connection control, the no-lode grid-connection control strategies of AC excitation wind power generator is established, the decoupling control of the rotor side current and flux is achieved, and the purpose of the soft no-lode grid-connection is finished. The no-lode grid-connection simulation model based on Matlab/Simulink was established and analyzed, and an experiment was made on the simulated wind system platform of 11KW in the laboratory, the Simulation analysis and experimental results showed that the control strategy can effectively control the stator voltage frequency, amplitude and phase is the same as grid voltage, the feasibility of the control program is verified.