Abstract
It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are of considerably smaller scale than conventional synchronous generators and are therefore connected to distribution grids, as the DFIG-based wind farm. When connected in small amounts, the impact of wind farm on power system transient stability can be negligible. However, if its penetration level becomes higher, wind farm may start to influence the dynamic behavior of the power system as a whole. In this paper, the impact of DFIG-based wind farm on the load modeling is investigated. It is found if the influence of wind farm is not negligible, the composite induction motor load model fails to describe the actual load characteristic effectively. A new load model-asynchronous generator +ZIP is used in this paper. The validity of the load model is also verified via various simulations. Then, composite induction-motor and asynchronous generator +ZIP load models are unified in one program.
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