Research On Wake Model Of Wind Turbines In Offshore Wind Farm

Recently, environmental problems become more and more serious in China, and many people’s daily life is troubled by haze weather. It’s time for our country to develop clean energy vigorously. As the most mature new energy technology, wind power generation is gradually paid more attention by people. There are many advantages for offshore wind power, such as high wind speed, low turbulence, small wind shear and so on. Many policies about encouraging offshore wind power development are introduced in recent years. And wake effect is a significant topic for offshore wind farm.Some research about wake model of offshore wind turbine is done here. Contraposing the shortage of Jensen model, velocity deficit following Gaussian distribution has been introduced, a new far-field analytical wake model is obtained. On the basis of wind tune tests of FFA and tests of Nibe wind turbine for reference, the new wake model calculated the wind velocity distribution field of the wind turbine wake. The calculation results are very close to the actual data.After that, a 3d audience wake model is programmed, which can simulate the velocity distribution and power output of the whole regular wind farm, and the wind profiles is still considered in the program.The new model, improved Jensen model and its amended model are used to simulate the wind turbine wakes of Horns Rev wind farm and Dafeng wind farm. And a new method which can be used to deal with the operating data is proposed. The results show that power calculation results of new model agree with the operating data, better than improved Jensen model and its amended model. The calculation results indicate that the program of the new wake model has its practical value and the hypothesis of velocity deficit following Gaussian distribution is quite close to the actual velocity deficit distribution.