基于等效建模的风电机组增功技改快速评估方法研究

Research on Rapid Evaluation Method for Wind Turbine Power Enhancement Technology Based on Equivalent Modeling

针对当前风电机组增功技改中存在获取建模参数困难,所建模型精确度不高的问题,提出一种基于等效建模的风电机组增功技改的快速评估方法。采用基于SCADA数据概率统计方法,建立了风电机组控制参数模型;基于翼型数据库与叶素动量理论,建立了叶片基本几何模型,采用优化算法,以风电机组特性曲线为目标进行模型优化。利用NREL5MW风电机组对等效建模方法进行验证,得出功率与推力曲线吻合很好。对某2MW风电机组进行等效建模,在等效模型的基础上研究了叶尖加长方法,并对加长的效果进行了气动评估,结果表明通过SCADA数据获取的参数能更好地符合实际机组的运行情况,等效模型能准确模拟出原模型的气动特性,叶尖加长后能显著提高风电机组的年发电量,具有较好的经济效益,是解决风电机组发电效率低、经济效益差的有效方法。

In response to the difficulties in obtaining modeling parameters and the low accuracy of the built models in the current wind turbine power enhancement technology transformation,a rapid evaluation method for wind turbine power enhancement technology transformation based on equivalent modeling is proposed.Firstly,control parameter modeling is conducted based on the probability distribution of SCADA data for a certain 2MW wind turbine.On this basis,an equivalent modeling method is proposed,which uses genetic algorithm to obtain an equivalent model with aerodynamic performance consistent with the original unit situation.The NREL5MW unit is then equivalently modeled to verify the accuracy of the model.Through this method,the equivalent modeling of a 2MW unit is carried out,and the effect of tip lengthening is evaluated on the basis of the equivalent model.The results show that the parameters obtained from SCADA data can better fit the actual unit operation,and the equivalent model can accurately simulate the aerodynamic characteristics of the original model.After the tip lengthening,the low efficiency of wind turbine generation can be effectively improved,and the problem of insufficient wind resources can be remedied.