通过引人双恒等变换，推导出系统和辅助系统的自校正预报模型。
By introducing double constant alterations, we establish self-tuning predictive models of system and auxiliary system.
通过一系列的坐标变化和近恒等变换，将电力系统的动态方程简化成三阶规范形，从而得到系统的分岔方程。
The dynamical equations of the system are simplified to a3-order normal form with a series of coordinate and approximately identical transformations, and a bifurcation equation is thus obtained.
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