Study on Current Controller of Doubly-Fed Induction Generator with Variable Parameters

Abstract

In recent years, current control strategy has played an important role in power system stability analysis. Based on the doubly-fed wind turbine model, the effects of PI- R, PI, IP and adaptive control strategies on the dynamic performance of the system are analyzed and compared. In this paper, the mathematical model of the doubly-fed induction generator is established in the rotating d-q axis frame, and the transfer function of the current controller is deduced and analyzed. On this basis, four current control strategy models are established. The simulation results show that all the control systems have strong robustness when the parameters are uncertain. Moreover, compared with other control strategies, PI-R has better dynamic performance. This method can solve the control problem of wind power system based on DFIG under unbalanced loads and nonlinear loads.