用于风电场聚合建模的内部集电网络变换方法

摘要

风的随机性使得风电场内具有相近运行状态的风电机组的空间分布也具有随机性,因此在风电场聚合建模中将涉及任意位置上风电机组的聚合问题.针对辐射形结构的风电场,提出了一套集电网络处理方法.在拓扑及参数已知的情况下,以网络变换前后由电网电压产生的风电机组端口电压不变为原则,可以对集电网络进行并联化变换；而当已知条件不足以进行此项变换时,以风电场聚合前后功率相等为原则,可以对集电网络进行单阻抗等效.经过网络变换后,风电场内各台机红之间将成为纯并联结构,可以适应任意位置上风电机组的聚合.仿真结果表明,该变换方法对基于定速感应发电机和双馈感应发电机的风电场都适用,且得到的聚合模型具有很高的精度.%The spatial distribution of the wind turbine generators which have the similar operating state varies with the randomness of wind. Therefore, aggregating the wind turbine generators in random positions is essential when obtaining the aggregated model of the wind farm. To meet this requirement, a set of network transformation methods for the wind farms with radial collector network is presented. When the topology and parameters are known, a "parallel connection aimed transformation" can be used based on the principle that the terminal voltages produced by grid voltage of a wind turbine generator before and after the transformation should be equal. Otherwise, "single impedance equivalence" of the collector network can replace based on the principle that the power of the wind farm before and after the aggregation should be equal. After the transformation, the connection scheme of wind farm will turn into pure parallel structure which is well adapted to the aggregation of wind turbine generators. The simulation results show that the transformation methods are applicable for both FSIG-and DFTG based wind farm. And the aggregated wind farm model obtained through the transformation has a high accuracy.