Stability and Dynamic Performance Analysis of Doubly fed Motor Island Operation

With the rise of the concept of microgrid, the research of double fed induction generator(DFIG) in the island operation mode has gradually become a hot spot. However, the research on the stability of DFIG in island mode and the influence of controller parameters on the dynamic performance of the system is still relatively small. In this paper, the state space equation of DFIG under the island operation mode is established by means of small signal analysis, and the stability of the system is judged according to the distribution of the characteristic roots of the characteristic matrix A
sys
in the s plane. In order to further analyze the dynamic performance of the system, this paper analyzes the influence of the controller parameters on the dynamic performance of the system according to the direction of the characteristic root by drawing the root locus diagram of the A
sys
characteristic root changing with the controller parameters. Finally, the validity of the analysis method is verified by simulation.