一种考虑环境温度和风速影响的风电场极限增容方法

A Method of Wind Farms Limit Capacity Increase Considering Influence of Environmental Temperature and Wind Speed

当前风电场送出容量计算中只考虑了风速的影响没有考虑环境温度的作用,且对架空导线极限载流量的分析没有考虑风电特殊的工作环境,造成风电场线路输送资源的浪费,因此提出一种考虑环境温度和风速影响的风电场极限增容方法,最大化开发利用风电资源。首先,在传统风机出力模型的基础上增加环境温度的影响,改进风机出力模型;然后,通过架空导线热平衡方程,建立考虑环境温度和风速共同影响的导线极限载流模型;最后,通过绘制风电场风机总出力曲面和导线极限载流曲面在环境温度和风速坐标系内的分布情况,将风机出力与导线极限载流特性进行匹配,得到风电场最大可允许的输出容量。仿真结果表明,相同导线截面的风电送出线路有一定的输送功率裕度,确定风电场极限输送容量、提高风电场的经济效益对指导风电场增容具有重要意义。

At present,only the influence of wind speed is considered in the calculation of the transmission capacity of wind farms,and the influence of ambient temperature is not considered.In the analysis of the ultimate current carrying capacity of overhead conductors,the special working environment of wind power is not considered,resulting in the waste of wind farm line transmission resources.Therefore,this paper proposes a method to increase the capacity of wind farms considering the influence of ambient temperature and wind speed to maximize the development and utilization of wind power resources.Firstly,the influence of ambient temperature is added on the basis of the traditional turbine output model,and the turbine output model is improved.Then,through the overhead conductor thermal balance equation,the ultimate current-carrying model of the conductor considering the combined influence of ambient temperature and wind speed is established.Finally,by drawing the distribution of the total output surface of the wind turbine and the ultimate current-carrying surface of the conductor in the coordinate system of ambient temperature and wind speed,the output of the wind turbine is matched with the limiting current-carrying characteristics of the conductor to obtain the maximum allowable output capacity of the wind farm.The simulation results show that the wind power transmission line with the same conductor cross-section has a certain transmission power margin,and the paper method can determine the ultimate transmission capacity of the wind farm and improve the economic benefits of the wind farm,which is of great significance for guiding the capacity increase of the wind farm.