基于尾流效应的双馈式风电场动态等值模型研究

The Study for Dynamic Equivalent Model of Doubly-fed Wind Farm Based on Wake Effect

针对风电机组间尾流效应对风电场并网点输出特性有较大的影响及常用的风电场单机等值模型误差大的问题,提出了考虑尾流效应的多机等值风电场动态等值模型。该方法计及Jensen模型作为风电场划分判据,将各组群进行独立等效。最后以电磁暂态仿真软件PSCAD/EMTDC为分析平台,搭建了双馈风电场详细模型和两种等值模型。通过比较风速波动情况下和故障情况下风电场等值模型与详细模型的并网点输出特性,验证了所提方法的准确性和适用性。

In view to the problems that the wake effect between the wind turbine generators has great infulence on output characterisit- ics of the grid-connected point of wind farm and the commonly used single equivalent model of wind farm has great error, so a multi- machine representation dynamic equivalent model of wind farm based on the wake effect is proposed. This method, using Jensen model to partition the wind farm, makes the independent equivalent for each group of classes. At last, using electromagnetic transient analy- sis software PSCAD/EMTDC as the platform, builds the detailed model and two equivalent models of doubly-fed wind farm. Through the comparison of output characteristics of equivalent models and the detailed model of wind farm at the grid-connected point under wind speed fluctuation and fault condition, the accuracy and applicability of the proposed method is verified.