The Study On Wind Power Generator System Based On Auto-disturbance Rejection Control

With the shortage of normal energy source, it is very important to solve the energy crisis by using renewable energy source such as wind energy in the future. Variable-speed constant-frequency (VSCF) doubly fed wind-power is a new high efficient technology for power generation. Under understanding the the researching results in this field, the capturation of the maximal wind energy is deeply study in this thesis to improving the efficiency of VSCF wind power generation system.Firstly, the DFIG's fundamental, mathematics model of DFIG in the synchronous rotary coordinate dissertation are discussed. The equivalent circuit and control characteristics are analysed. Then the fundamental and design method of ADRC are systematically introduced, including its developments and basic ideas,the principal and the design method of three basic components-T-D,nonlinear state error feedback, ESO. Based on stator-flux-oriented, using the speed control model of variable speed constant frequency wind power generation system with doubly-fed induction generator,the auto-disturbance rejection control is introduced to capture the maximal wind energy. The extended state observer (ESO) is used to observe and compensate the couplings voltage and the fluctuations of grid voltage so as to improve the system performances. Simulation results in MATLAB/Sinmulink has shown that the system with the auto-disturbance rejection controllor has the better dynamic performances and the ability in restraining fluctuation of grid voltage than PI system.