模糊算法在线优化PI控制器参数的PLC设计_自动化专业论文
发布时间：2015-01-22
来源：人大经济论坛
自动化专业论文范文
目 录
摘要I
AbstractII
1 绪论1
1.1 选题背景及意义1
1.2 选题目的2
1.3 国内外研究情况2
1.4 课题的研究方法及内容2
2 基本原理4
2.1 模糊控制相关知识4
2.1.1 模糊控制基本思想4
2.1.2 模糊控制的特点4
2.1.3 模糊控制原理5
2.2 PID基本知识6
2.2.1 PID参数自整定及其发展现状6
2.2.2 PID算法及参数整定7
2.3 PLC相关理论8
2.3.1 PLC定义及发展史8
2.3.2 PLC的特点9
2.3.3 PLC的系统组成及工作原理9
2.3.4 PLC的编程语言和程序结构10
2.4 软件使用12
2.4.1 STEP 7 概述12
2.4.2 程序设计软件使用12
3 水箱液位控制系统程序设计13
3.1 实验装置及控制方案13
3.1.1 实验设备及控制对象13
3.1.2 控制方案13
3.2 PLC选型15
3.3 I/O及内部地址分配16
3.3.1 地址分配基本概念16
3.3.2 程序设计内部地址分配16
3.3.3 优化程序的PI回路表17
3.4 系统设计17
3.4.1 程序总述17
3.4.2 模糊化模块17
3.4.3 模糊关系矩阵的生成21
3.4.4 E与Ec的合成运算23
3.4.5 模糊推理25
3.4.6 解模糊化27
4 程序调试及结果分析29
4.1 实验准备29
4.2 程序调试29
4.3 结果分析30
结论32
致谢33
参考文献34
摘要
作为人工智能控制技术之一的模糊控制技术理论，倍受业界专家及学者们的瞩目和广泛的应用研究。具有不需要建立被控对象的精确数学模型、鲁棒性强等特点的模糊控制技术，有着常规控制技术无法比拟的优点。本设计阐述了模糊控制的发展、现状及其基本原理，研究了基于模糊规则的控制技术在PI控制中的应用并且对控制算法进行了验证。首先对常规PI控制算法，模糊控制技术及其原理进行了深入的分析。然后针对水箱液位控制系统编译了基于模糊算法在线优化PI控制器参数的PLC程序。最后介绍了程序调试的具体过程和相关问题，借用MCGS组态软件监控控制过程的调节曲线，并给出结果分析。结果表明，模糊算法在线优化的PI控制器能够有效地克服经典PI控制器在被控对象具有非线性、时变不确定性和难以建立精确的数学模型时出现的参数整定不良性和性能欠佳等缺陷，取得令人较为满意的效果。
关键词：模糊控制；PI控制器；PLC
The PLC Design of Optimimal PI Controller Parameters on line by the fuzzy algorithm
Abstract
As one of artificial intelligence control technology,the theory and technique of fuzzy control have been noticed greatly, and is widely used andresearched by related exports and scholars.The fuzzy control technique which does not need establish exact mathematical model on passive control object, and so on has overwhelming advantages than typical control technique. This design elaborated the development of fuzzy control, the present situation and the basic principle, it have mainly studied fuzzy control technology based on the fuzzy rule, which is applying.in the PI control. In addition, the design also validate the control algorithm. First,the design analyses the conventional PID control algorithm,fuzzy controll technology and the principle of fuzzy controll.Then the PLC procedure of optimized PI controller parameter on line by the fuzzy algorithm for the control system of the highness of the wanter tank is compiled. Finally this design introduce the concrete process and the correlation question of programme adjusting, monitor the regulating curve of controlled process in MCGS,and analysis the result.The result shows that,the optimized PI control based on fuzzy algorithm be able to overcome the flaws of the installation not benignity and the performance not fine,which the classics PID controller can not do,when the controlled object is non-linearity,the time-variable uncertainty and establish precise mathematical model is difficult.
Key words：Fuzzy control;PI controler;PLC
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