Simulation and Experimental Analysis of Grid-Connected Doubly-Fed Induction Generators

With the increase of wind generation penetration in power systems, it becomes more and more important to study its impact on power systems characteristics. The accurate dynamic modeling of wind plants is critical for the grid planning and operating studies. The field test of a three phase short circuit fault at a 35kV busbar in a wind farm in Zhangjiakou Area was performed and a series of corresponding measurements were carried out. A variable speed doubly fed induction generator (DFIG) model in Power System Analysis Software Package (PSASP) is validated and parameters in the models are adjusted by comparing with the results from the field test. Based on the well adjusted parameters of the DFIG model, simulation result shows a better agreement with the field test, and the model has been verified. The reasons for the mismatch between the simulation and the field test results have also been analyzed in the paper. The study contributes to analyzing the impact of grid-connected DFIG on transient stability of the power system.