Research On Model Of Wind Farm And Its Application

With the coming mature of the wind energy technology, wind power has becoming a significant mainstream generating technology for electricity system all over the world. Both the foreign and native researchers are exploring and researching in area of the power system integration of wind power, and they have drawn some conclusions. However, there are still some issues, such as the practical application of the wind farm model is not precise enough. So we need establish more precise and practical model of the wind farm.In this paper, Matlab is used as a modeling and simulation tool. First, on the basis of steady-state model including fixed-speed induction generator and double fed induction generator, the steady-state model of wind farm including collecting system was established, which was applied to the load flow calculation of an actual power grid. Compared with the model of wind farm which ignored the collecting system, note that the significance of collecting system equivalent in the steady-state model of wind farm. Then it was used to analyze the change of load flow and network loss when wind farm connected to the grid.Second, dynamic model of wind farm containing detailed model and simplified models were established. The precision of simplified models under different circumstances was illustrated by comparison of simulation result. A simplified model of wind farm was used to analyze the impact of wind farm integration on power system transient stability. Then wind farm model was replaced by synchronous generator model, it is concluded that the impacts on the grid transient stability conducted by synchronous generator and wind farm is different.Last, the dynamic model of double-fed induction generator which suitable for harmonic analysis was established and it was used to analyze the harmonic impact of wind farm integration on power system. The result showed that when DFIG connected to the power system, it can meet the harmonic standard.