dcs中简单控制学习问答（Simple control learning question and answer in DCS）.doc

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dcs中简单控制学习问答（Simple control learning question and answer in DCS）.doc

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dcs中简单控制学习问答（Simple control learning question and answer in DCS）

dcs中简单控制学习问答（Simple control learning question and answer in DCS） DCS learning questions and answers 2010-3-10 13:45:56 1. what is called a cascade control system and a typical block diagram of a general cascade control system is drawn. A: a cascade control system is named after its structural characteristics. It is connected by two main controllers and two controllers. The output of the main controller is used as the given value of the auxiliary controller, and the output of the secondary controller is used to control the control valve so as to realize the constant value control of the variable. What are the features of the 2. cascade control system? What are the main applications? The main features of cascade control systems are: (1) in the system structure, it is a double closed loop control system composed of two controllers connected in series; (2) the purpose of the system is to improve the quality of control of the primary variables by setting up sub variables (3) because of the existence of sub circuit, the interference to the secondary circuit is controlled in advance, so the influence of interference on the main variable is reduced; (4) the system has adaptive ability to load change. Cascade control system is mainly used in: object lag and time constant is large, interference is strong and frequent, load changes, and high control quality requirements of the occasion. How should the main and dramatic variables be selected in 3. cascade control systems? The selection principle of primary variables is the same as the selection principle of controlled variables in a simple control system. The selection principle of sub variables is: (1) there should be some inherent relationship between the main and sub variables, and the change of sub variables should influence the change of the main variables to a great extent; (2) through the choice of sub variables, the secondary circuit can contain the main disturbance of the system; (3) when possible, the secondary circui