Frequency Response Model of Doubly Fed Induction Generator Wind Turbine

Wind turbine with doubly fed induction generator (DFIG) is one of the major types of wind power generation. The active power of DFIG responds to the change of system frequency, but the frequency response characteristics are quite different from the synchronous generator. The response of DFIG to the change of system frequency is studied, and a reduced order frequency response model of the DFIG is derived in this paper. This reduced order model can describe the influence of PLL and vector controller on the dynamic characteristics of DFIG’s internal voltage and output power with relative low order, so it is suitable for power system frequency dynamic analysis. The accuracy of the model and the necessity of retaining key control links are discussed.