Keeping in mind that retrofitting funds for old power plants are limited, the paper discusses the design principles of coordinated control systems and the way of doing the design.
在老电厂改造经费较少的情况下，分析了具有电网中调控制方式的协调控制系统的设计原则和主要控制系统的设计方法。
Then the principles of hierarchical estimation and feed forward compensation are applied to derive the power system state estimation and load frequency control equations.
然后，应用分层估计和前馈补偿原理导出电力系统状态估计和负荷频率控制方程。
In the end, this article does a further analysis to the principles of the switch Mode Power Supply, compared the manual and the automatic switch control and got their respective control diagram.
进一步对电源系统切换控制的原理进行了分析，比较了手动和自动切换控制，并给出了各自的控制框图。
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