模糊PID控制在S7-300PLC中的实现及应用

针对双容水箱的液位控制,采用模糊自适应PID串级控制方案.模糊自适应PID算法不需要建立精确模型,并保留了传统PID算法的优点,基于模糊规则在线调整PID参数.在西门子S7-300 PLC中,使用编程软件Step7中梯形图和STL语言编写程序,开发了模糊自适应PID模块.将该算法应用于双容水箱的液位控制,实验结果表明,...

Realization of fuzzy PID control on S7-300 PLC and its application

Aiming at the level control of coupled-tanks,a fuzzy adaptive PID cascade control strategy based on fuzzy logic was proposed.It was not necessary to build an accurate mathematical model,and it retained the advantages of the traditional PID algorithm.The fuzzy PID algorithm adjusted PID parameters on line based on fuzzy rules.This algorithm was developed on Siemens S7-300 PLC and programmed with ladder diagram and STL language in Step7.And a fuzzy adaptive PID module was obtained.It was applied to control the level of coupled-tanks.The experimental results showed that the overshot,the adjusting time and the capacity of anti-interference of fuzzy adaptive PID cascade control were superior to those of cascade PID control.