传动轴模型对双馈风电机组的动态性能影响

Influence of the Transmission System on Transient Responses of Doubly Fed Wind Power Generators

为更加真实地研究并网双馈风电机组的暂态性能及其稳定性,传动系统一般采用考虑传动轴柔性因素的等效两质量块或更高质量块的建模方式。这里基于双馈风电机组的功率控制策略和电磁暂态模型,在电网故障情况下,对考虑传动轴柔性因素的等效两质量块模型和忽略传动轴柔性因素的等效一质量块模型进行暂态性能仿真比较,并通过实验验证得出,两种模型对于电压跌落的暂态响应明显不同,等效两质量块模型暂态响应振荡更大。

In order to analyze the influences and mutual effects of the grid-connected doubly fed wind power generators, transmission system is usually modeled in equivalent two-mass model or higher mass model considering flexibility of transmission shaft.Based on a power control strategy and the electro-magnetic transient state models of a doubly fed wind power generators, the equivalent two-mass model considering the flexibility of transmission shaft and the equivalent one-mass model are used in the simulation in order to compare the transient performance.The experiment is done to verify the simulation results.The experimental results show that the transient responses of the equivalent two-mass model and the equivalent one-mass model are significantly different, the oscillation of response of two-mass model is greater than the oscillation of one-mass model.