It applied bifurcation approach of elementary catastrophe theory to find out control parameters' bifurcation values, which decide stability of power systems, further, stability region can be obtained.

它运用初等灾变理论中分岔的概念找出决定电力系统稳定的控制参数的分岔值，从而确定了系统的稳定区域，由稳定区域即可进行系统的稳定判断。

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