毕业设计（论文）-基于PLC的模糊PID水箱液位控制系统设计.doc

毕业设计(论文)
基于PLC的模糊PID水箱液位控制系统设计
系别
自动化工程系
专业名称
测控技术与仪器
班级学号
5080926
学生姓名

指导教师

2012年6月15日
基于PLC的模糊PID水箱液位控制系统设计
摘要
常规PID控制器结构简单、稳定性好、工作可靠,被广泛应用于过程控制中,但常规的PID在系统参数、工作环境发生变化时往往不能获得较好的控制效果。采用基于PLC知识和不依赖精确数学模型的模糊控制来解决这类问题。
本文首先通过机理法建立液位控制系统水箱的数学模型,为了改善调节过程的动态特性,采用串级控制,主调节器用模糊控制,副调节器采用PID控制。根据液位系统的特征,选取合适的模糊控制规则和隶属度函数,建立模糊控制规则查询表,设计PID控制器和模糊控制器,将设计好的串级系统在Simulink软件上进行仿真,比较常规PID控制器和模糊PID控制器的控制性能。
通过西门子SIMATIC S7-300 PLC 。,将设计好的液位控制系统进行仿真。实验表明模糊控制器具有良好的动、静态控制效果。
关键词:过程控制,PID控制,模糊控制,PLC,力控组态软件
Based on PLC fuzzy PID water level control system design
Author:Yang Wei
Tutor:Lv Jiangtao
Abstract
The conventional PID controller simple structure, good stability, reliable working, are widely used in process control, but the conventional PID parameters in the system, working environment change often cannot obtain the good control effect. Based on PLC knowledge and not rely on the accurate mathematical model of fuzzy control to solve the problem.
This paper first through the mechanism of water level control system method to establish the mathematical model, in order to improve the dynamic characteristics of the regulatory process, the cascade control, regulation is the fuzzy control, vice regulator PID control. According to the characteristics of liquid level system, to select the suitable fuzzy control rules and membership functions, establish the fuzzy control rules lookup, PID controller and fuzzy controller design, the design good ship machine system in Simulink software, and simulation is the conventional PID controller and fuzzy PID controller control performance.
Through the Siemens SIMATIC S7-300 PLC programming system and the force control configuration software design of the Siemens PLC conventional PID systems and fuzzy PID control algorithm. Through the configuration software force charged with real-time monitoring level changes, Will design good level control system was simu