三阶对象的单回路和串级控制的比较研究

针对三阶系统可以描述大多数自然界中的被控对象,本文设计了一套三阶三容水箱控制系统。采用西门子PLC作为硬件控制平台,分别对下水箱液位进行单回路控制和串级控制,通过分析被控对象的响应曲线来比较两种控制方案的特点。实验结果表明,当扰动作用点位置不同时,串级控制都比单回路控制具有更好的控制品质。

Comparative study of single-loop control and cascade control of third-order object

For third-order system can describe most of the controlled objects in nature, this paper designs a third-order object control system which contains three tanks.In the control system, Simatic PLC is employed as the hardware controller.And the single-loop control system and cascade control system are established respectively in order to compare their control characteristics.Through comparing and analyzing with two control methods, experiment results show that cascade control system has better performance than single-loop control system no matter where the disturbances get into control system.