倒数模型在纯滞后控制系统中的应用探讨

Discussion on the Application of Reciprocal Model in the Pure Time-Delay Control System

以纯滞后控制系统为研究对象,为解决具有纯滞后特性被控对象受控难的问题,设计了一种倒数模型。引入闭环负反馈环节,确保可能含有非最小相位环节的倒数模型的稳定运行。采用积分环节实现对被控对象的预补偿,改善被控对象控制品质。利用Simulink仿真软件,对各个环节进行验证,确保模型的准确性。仿真结果表明,倒数模型的控制效果优于史密斯预估模型。倒数模型适用于具有纯滞后特性的被控对象,且其应用时不需要获得被控对象的数学模型。倒数模型具有结构简单、参数设定方便、利于工程现场推广等优点。

With pure time-delay control system as the research object,a reciprocal model is designed to solve the problem of the controlled object with pure time-delay characteristics which is difficult to be controlled. Closed loop negative feedback is introduced to ensure stable operation of the mathematical model with non-minimum phase link. The integral link is used to realize the pre-compensation of the controlled object,and improve control quality for the controlled object. By using Simulink simulation software,each link is verified to ensure the accurateness of the model. The conclusion of simulation shows that the control effect of the reciprocal model is better than that of the Smith prediction model. The reciprocal model is suitable for the controlled object with pure time-delay,and it does not need to obtain the mathematical model of the controlled object in its application. The reciprocal model features simple structure,convenient parameter setting,and is conducive to the promotion in industrial fields.