Research Of Wake Model Of Wind Turbine In Wind Farm

With the rapid development of wind power in the worldwide, large-scale wind farms, large-capacity wind turbine has increasingly become the mainstream of today’s wind power development. It inevitably brings some new problems, the wake effect is one of them, wind turbine wake not only affects the output of wind turbines, but also affects the structural fatigue of wind turbine. Full consideration in wake interaction between wind turbines of the wind farm, is the promise to carry out micro-location selection of wind farms, the optimization of wind turbine layouts and the forecast of short-term output.The single wind turbine as the research object, it is deeply studied several semi-empirical models, such as the Jensen model&improved Jensen model which based on the ideal wind turbine1D momentum theory and the inviscid near field wake model which based on the experience. First of all, above on the Jensen model&improved Jensen model, contraposing the shortage of the two models, physical amendment has been proposed. The model and the correction calculation programs are written, on the basis of wind tunnel tests of FFA and Tokyo University for reference, calculated the wind velocity distribution field of the wind turbine wake, the results are compared and analyzed. After that, combined with inviscid near field wake model, two kinds of full wake models A and B are founded, then wrote them as the calculation program. The velocity distribution in the wake of the Nibe wind turbine is calculated, and compared them with the measured values. Then according to literatures, compare new models with other famous model calculation results. Finally, the calculation parameters and the calculation of wind speed profile of the newly established models are discussed.The results show that the proposed amendment greatly improved the original model calculation results, the computing result of the new models correspond to the changing trend which is the speed decline at first then rise up again finally become gradual, and model B more optimal than model A. The proposed models can be used for the simulation of the whole wind speed distribution of wind turbine wake, be able to guide wind power engineering practice.