Research On Maximum Power Output Control Of Wind Farm Considering Aerodynamics Influence

Energy crisis, environmental problems and the technical improvement of wind power generation promote the operation of large-scale wind farms connected power grid. It is predicted that wind power will occupy an important position in the energy structure in near future. Wake effect has important influence on power output of wind farms which cannot be ignored, however traditional MPPT operation mode of wind turbine cannot realize optimal power output of the whole wind farms with the aerodynamic interaction between turbines. In order to increase the utilization ratio of wind power and economic performance of wind farms, it is required to consider the effect of aerodynamic in wind farms and improve current control flow of turbines. Coordinating and optimizing the active power output of wind turbine generator to realize the maximum output of wind farm. The main research contents of this dissertation are as follows:This dissertation firstly analyzed energy conversion process of turbine and the relationship of axial induced factor and active power output based on ideal momentum theory. Then the author explored the establishment of one-dimensional linear wake model, combined with the combination model for wind speed and wind farm model. Finally, the dissertation analyzed the active power output of wind farm under different wind conditions with the consideration of wake effect.According to game theory, especially the cooperative game theory, this dissertation regarded every wind turbine in wind farm as players of the game, regard the sum of active power output belong to single turbine as profit function, and established maximum output cooperative game model of wind farm, calculating the results with distributed learning algorithm. When wind farm worked under the mode of cooperative game, the whole active power output was improved significantly. What's more, the algorithm has good convergence and stability and applies to the fault scenarios simulation likewise.In the last part, this dissertation proposed the maximum output control scheme of wind farm with the consideration of wake effect. Firstly, the author introduced the basic idea and overall framework of the scheme. Based on the current control flow of wind farm, an improved maximum output control flow was put forward to optimize the active power distribution of wind farm. The scheme regard active power output as optimization goal, coordinated and optimized the active power reference value of each wind turbine based on interior point algorithm. The effectiveness of the proposed scheme was verified through simulation of different operation mode and wind conditions, and the scheme has certain reference value to the operation of wind farm.Based on aerodynamic modeling theory, this research analyzed the active power output of wind farm and proposed the maximum output control scheme of wind farm with the consideration of wake effect. The dissertation provide reference for wind farm to reduce wake effect, improve wind energy utilization rate and increase power generation capacity and economic efficiency.