用时步有限元法计算汽轮发电机直轴瞬态参数

Calculation of D Axis Transient Parameters of Turbogenerator by Time-stepping Finite Element Method

本文采用时步有限元法计算了汽轮发电机定子在空载情况下三相突然短路时的瞬态电磁场，得到了定子电流随时间的变化曲线，分析了短路后定子电流的谐波分量；讨论了转子阻尼系统用不同的回路数模拟时瞬态参数的变化；并以一台600MW汽轮发电机为例，阐述了瞬态电抗和时间常数的计算方法。

The transient electromagnetic field and the stator current of turbogenerator are calculated by time-stepping finite element method under three phases sudden short circuits. The harmonic components of short circuit current are analysed, the transient stator current and transient parameters are derived with the rotor damping systems simulated by one and two circuits. Finally, taking a 600 MW turbogenerator as an example, the method of determining the transient reactances and time constant is presented.