Optimal Control Of Output Power Of Wind Farm Considering Wake Effect

With the large-scale development and utilization of wind power,the density and capacity of units in wind farms are increasing,which makes the wake effect more serious.The wake effect decreases the wind speed at the downstream unit,which reduces the power.In the existing wind farm,the output power of wind farm is not the largest because the wake effect is not considered.Therefore,this paper studies the optimal control of wind farm output power under the influence of wake.Around this topic,the following contents are mainly completed:(1)Aiming at the problem of wake superposition caused by wind direction charge and unit arrangement in wind farm,based on Cartesizan coordinate transformation method,the calculation model of wake superposition area with wind turbine under different terrain was established.Based on the wake model of a single unit and the wake superposition model of a wind farm,the calculation method of the wake wind speed of a wind farm satisfying different wind directions is given in detail.(2)By optimizing the axial inducing factor or thrust coefficient,the wake distribution between units can be adjusted to increase the overall output power of the wind farm.Since the axial inducing factor or thrust coefficieut is not a directly controllable unit parameter,the speed of the unit can be adjusted first,and then the pitch angle can be adjusted to achieve the control of the unit.(3)When the wind farm layout is determined,the wind farm with 16 units is simulated by MATLAB.The results show that the proposed optimalncontrol strategy can effectively reduce the wake effect between urits and increase the overall output power of the wind farm.(4)When the output power of wind farm is required by power grid dispatching,based on the maximum output power of wind farm considering the wake effect,the fuzzy C-means algoritlim is used to classify the units with similar operation characteristics,and then the eqlivalent processing is done after the classiflcation.In the case of power reduction,power reduction operation is carried out from downstream units to upstream units.When power reduction occurs,the speed is adjusted first,and then the pitch angle is adjusted when the speed regulation cannot meet the requirements.The wind farm with 16 units is simiulated with MATLAB.The resslts show that the proposed p2wer control strategy can meet the recqairements of power reduction.