利用慢流形和快流形的概念，研究了电力系统三时间尺度动态模型降阶的条件。
The condition for the reduction of a three time scale power system model is studied by using the concepts of fast and slow manifolds.
但对于多时间尺度的电力系统模型降阶问题而言，还必须研究快流形的存在性及其基本特征，以给出固定系统慢动态的降阶条件。
But for a multi time scale power system, existence and fundamental characteristics of fast manifolds must also be studied in order to obtain the model reduction condition of fixing slow dynamics.
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