A constraining facet is a construct that you can use to control the value space of simple type during derivation.
约束facet是一种构造，可以在派生期间使用它们控制简单类型的值空间。
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Through a rational derivation, nonlinear mathematical model of electro-hydraulic position control system is built up. The system dynamic and stability analysis is obtained with the use of the model.
The control parameters and regulation pattern is set up according to the power flow control problem. A detail derivation is made on the equivalent injection power equation of several FACTS devices.