Modeling the Impact of System Disturbances on Grid-Connected DFIG Using Dynamic Phasor FEM

A co-simulation study of a wind-driven Doubly Fed Induction Generator (DFIG) and its connected power system is presented in this paper to study the generator performance under network disturbances. In order to accurately model core-saturation and harmonic effects, the machine is modeled using a Dynamic Phasor finite element model that couples the state variables of a co-simulated system. The presented co-simulation solver is used to study the influence of various power system disturbances on the performance of a grid-connected DFIG. The studied grid disturbances are symmetrical and asymmetrical voltage sags, and harmonic pollution in the source voltage. Simulation results of the Dynamic Phasor Finite Element Method (FEM) are compared to traditional time-domain FEM (considering core saturation for both solvers) to prove the validity of the new method for modeling disturbed power systems in an accurate and fast way.