考虑弃风的DFIG风电场动态等值模型

摘要

我国弃风现象严重，在此大环境下，为了得到更为准确的风电场模型，提出了一种考虑弃风的双馈感应异步发电机（DFIG）风电场的建模方法。该方法考虑了由于尾流效应导致风电场内各台风力机输入风速不同，兼顾调度部门向风电场下达的弃风指令，提出了以风能利用率C p为分群指标，建立了DFIG风电场的多机等效动态模型，大幅度提高了仿真速度。该方法更贴近风电场实际运行情况，分群指标易于得到。通过PSCAD算例仿真及结果对比，表明该风电场等值模型的输出在稳态和故障情况下都能更好地拟合详细模型。%In China, wind power curtailment is very common. For geting a more accurate wind farm model, a new wind farm model of DFIG considering wind power curtailment is proposed. This method takes both wake effect and the order from power dispatchers into account, to make power coefficient as a classification index, a multi-machine dynamic equivalence model with DFIG is built, the run time of this model is less. Classification index is easy to get and the model is more similar to actual operation situation. By establishing models on PSCAD platform, the results show that the proposed equivalent model can more accurately describe the output of the detailed model under both steady state and transient state.