定子磁链暂态对双馈感应电机接入系统小干扰稳定的影响

Impact of DFIG stator flux transients on power system small signal stability

该文研究了定子磁链暂态过程对双馈感应电机接入系统的小干扰稳定的影响情况。首先建立了描述双馈感应电机电磁过程的8阶详细模型,并进一步推导了它的小干扰稳定的计算公式。根据Lyapunov特征值理论,对单个双馈感应电机经过传输线接入无穷大母线系统进行了数值分析。结果表明:无论是控制器参数变化还是传输线路电抗变化,6阶模型的稳定边界范围都比8阶模型更大。采用简化6阶模型不利于系统稳定性分析。

Stator flux transients can affect the stability of small signals in power systems.An 8-order model was developed to describe the double fed induction generator（DFIG） electromagnetic process with formula for calculating the small signal stability.Lyapunov eigenvalue theory is used to study a single DIFG-line-infinite bus system.The results show that the stability boundary of the 6-order model system is more optimistic than the 8-order model system for various controller parameters and different the transmission line reactances.The simplified 6-order model is not useful for system stability analyses.