【摘要】：The aerodynamic performance of an actual wind turbine system is studied by means of parameter estimation. This is approved applicable to the case with strong noises. The nonlinearity of the system is considered in the deriving of state equations. The aerodynamic performance of the system can be obtained from the data ae-quired in a short time. Such a new method on the research of aerodynamic performance for the wind turbine system is suggested to be used to the similar cases.DFIGs are mostly used in wind farms connected to the grid and they must meet the requirements provided by the power system. The influence of wind power is of great importance as it tells us the behavior of the power system that whether the system will be able to work in a proper manner after it is integrated with the wind farm. Several softwareare available to study the behavior of wind power on powers system.This thesis will focus on the influence of wind power on the power system stabilityDFIG are mostly used during the installation of wind power. In this thesis as we have to study The influence of wind power on the power system stabilityso during the modeling process variable current source is used in place of the DFIG to make the work simple. A three phase current source is used to inject the current into the power system to control the active and reactive power and effects are studied in detail.