Performance Analysis of a Controller for Doubly-Fed Induction Generators Based Wind Turbines Against Parameter Variations

摘要

This paper deals with modeling, analysis, and control of the Doubly-Fed Induction Generator (DFIG)for wind turbines. A model of a DFIG is developed in a rotating d-q axis frame. When the resistance and mutual inductance of DFIG are varying, the risk of the rotor failure is arising. To quantify the rotor current controller performances, transfer functions are derived and analyzed. The design of the current closed-loop control is analyzed according to the rotor current and voltage response. Simulation results of the time domain responses prove a strong robustness of our designed control system under parameter uncertainties. The disturbance rejection performance of the system decreases when the mutual inductance changes with small or large values. The results of the study ensure the operation safety of the wind power generation units, helping the reduction of the failure rate and improving the operation reliability.