基于实测数据的大型风电场功率模型研究

Research on Power Model of Large-Scale Wind Farm Based on Measured Data

大型风电场的装机容量已成为风功率波动影响电网安全稳定运行的一个重要因素。针对该问题并结合实测数据,提出基于最大风速的风电场输出功率时序特性建模方法。根据风电机组等效出力模型,引入风能利用系数评价不同机组出力的相互影响,在此基础上建立最大风速条件下的等效风能利用系数矩阵,通过拟合法构建风能利用系数的分布函数相并确定其相关参数,建立风电场输出功率等值模型。对实际风电场进行建模仿真,结果表明考虑风电场时序分布特性的机组功率模型能够准确反映该风场的出力特性,并能有效利用当地风能资源。仿真结果与实测数据的对比结果验证了所提方法的正确性与合理性。

Installed capacity of large-scale wind farms has become an important factor of wind power fluctuation influencing safe and steady operation of electric power system. On basis of the measured data, this paper proposes a method to compute time-sequential characteristics of wind farm output model based on maximum wind speed. Firstly, combined with the output model of traditional equivalent wind turbine, equivalent power coefficient is introduced to evaluate mutual influence of different unit outputs. Secondly, a time-sequential characteristic matrix of the equivalent power coefficient is established. Distribution function of power coefficient and related parameters are determined with curve-fitting method, and an equivalent model of wind farm output power is established. Finally, simulation is performed with the actual data of wind farms, and result shows that the unit outputs considering the time-sequential distribution characteristics of wind farms can make full use of local wind resources. Validity of the method is confirmed by comparing the simulated result with the measured data.