传动链模型参数对双馈风电机组暂态性能影响

Influence of models and parameters on transient performances of a wind turbine with DFIG

为了较准确地研究并网双馈风电机组机电耦合作用对其暂态性能的影响,考虑风力机和发电机之间传动轴扭转柔性因素,采用等效集中质量法,建立风力机传动链的等效为两个质量块模型。基于并网双馈风力发电机组的功率控制策略和电磁暂态模型,在电网电压跌落故障下,对采用两个等效质量块传动链模型时的机组暂态运行性能进行仿真,并和不考虑传动链柔性的等效为一个质量块模型时的结果进行比较。应用传动链柔性模型,选取不同参数值时的机组暂态效果进行仿真比较和分析。结果表明:考虑风力机传动链柔性有助于准确分析双馈风力发电机组暂态性能,其暂态性能和传动轴系刚度系数、风力机和发电机惯性时间常数密切相关。

In order to analyze correctly the influences and mutual effects of the mechanical-electrical decoupling for a grid-connected wind turbine doubly fed induction generator （DFIG） system, considering the factor of the drive train shaft tensional flexibility between a wind turbine and a generator, a two-mass wind turbine drive-train equivalent model was presented by using equivalent lump mass method in this paper. Based on a power control strategy and the electro-magnetic transient state models of a DFIG, the transient behaviors of the presented wind turbine generator system using a two-mass equivalent model were investigated under a grid voltage drop, and were compared with using a one-mass rigid equivalent model of a wind turbine drive-train shaft. In addition, the transient performances of the DFIG wind turbine system were also compared and analyzed using different parameters of a two-mass mass drive-train model. Simulation results have shown that it is helpful to analyze correctly the transient performances considering the wind turbine drive-train flexibility, the drive-train rigid coefficiency, the inertia time constants of wind turbine and generator have a close influence on the transient performances.