With the scale of power system larger and larger, the whole power system gets more and more complicated, and operation safety and stability of machines and grid become very important.
随着电力系统规模不断扩大，整个电力系统变得越来越复杂，机组和电网的安全运行及稳定性问题变得越加重要。
This paper describes the stability of control loop consisting of refrigeration evaporator and thermostatic expansion valve. It may directly influence refrigerating efficiency and operation safety.
分析热力膨胀阀和蒸发器调节系统的稳定性，它直接影响着制冷效率和运行安全。
The non-steady flow in pressure water-carriage system have quite influence on the stability and safety of operation of hydropower station, so it is paid more attention.
这两者各具特点，但又有机地联系在一起。 水电站有压输水系统非恒定流对水电站的稳定及安全运行有很大影响，所以对其研究也倍受人们重视。
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