To discuss the strictly positive realness judgment criteria of singularly perturbed systems, a singular system model is employed, and the existing positive real lemma of singular systems is improved.

利用广义系统模型，通过改进已有的广义系统正实引理，讨论了奇异摄动系统的正实性判断问题。

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Using singular perturbation model, by the example of a simple power system losing stability in big disturbance, this paper analyses the mid-long term instability mechanisms affected by slow dynamics.

采用奇异摄动模型，通过一个简单电力系统在大干扰下发生中长期失稳的实例，分析了慢动态对系统中长期失稳的影响。

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The mathematical model of structural dynamic system is established and the singular control problem is studied.

建立了结构动力系统控制的数学模型，并进行了奇异控制问题的研究。

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