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本科毕业设计(论文)题目:基于S7-300锅炉盘管出口水温滞后控制系统专题题目:学院:电气工程与自动化学院专业:自动化班级:093班学号:20091873学生:指导教师:职称:副教授2013年6月6日摘要锅炉控制在工业控制中一直富有新意的课题,对于不同的控制对象,有着不同的控制方式和模式。温度系统惯性大,滞后现象严重,难以建立精确的数学模型,给控制过程带来很大难题。本文首先对电锅炉采用的控制方案进行了深入研究,选择一种适合于PLC控制的方案。以锅炉为被控对象,以锅炉出口水温为主被控参数,以炉膛内水温为副被控参数,以加热炉电阻丝电压为控制参数,选用西门子CPU314C-2PN/DP为控制器,构成锅炉温度串级控制系统;采用典型的PID算法,运用PLC梯形图编程语言进行编程,实现锅炉温度的自动控制。这个方案既满足了系统快速和精确达到平衡,又大大的降低了成本并且简化了编程和调试工作。利用先进的PLC程序编制工具STEP7及杰控组态软件,完成了锅炉控制系统的程序设计和监控画面设计。关键词:PLC控制;锅炉控制;串级控制;PIDAbstractBoilercontrolhasbeeninnovativetopicsinindustrialcontrol,fordifferentcontrolledobjects,differentcontrolwaysandmode.Temperaturesystemofinertiaisbig,lagphenomenonisserious,isdifficulttoestablishaccuratemathematicalmodel,bringgreatdifficultiestocontrolprocess.Thispaperthecontrolschemeofelectricboileradoptsthecarriedonthethoroughresearch,chooseasuitableforPLCcontrolscheme.Inboilerforcontrolledobject,mainlyboileroutletwatertemperaturewasaccusedofparameters,withthewatertemperatureinthehearthtoassistantwasaccusedofparameters,withheatingresistancewirevoltageascontrolparameters,selectionofSiemensCPU314C-2PN/DPasthecontroller,aboilertemperaturecascadecontrolsystem;USESthetypicalPIDalgorithm,usingPLCladderdiagramprogramminglanguageprogramming,realizetheboilertemperatureautomaticcontrol.Thisschemesatisfiesthesystembalancequicklyandprecisely,andgreatlyreducedthecostandsimplifytheprogramminganddebugging.UseofadvancedPLCprogrammingtoolSTEP7andcontrolconfigurationsoftware,completedtheboilercontrolsystemprogrammingandmonitoringscreendesign.Keywords:PLCcontrol;Boilercontrol;Cascadecontrol;PID目录第一章绪论....................................................................................................................11.1课题的提出与意义.............................................................................................11.2研究背景及现状..................................................................................................21.3该课题的研究目标.............................................................................................31.4研究的内容及方法.............................................................................................4第二章控制系统方案设计.....................................................................................52.1锅炉自动控制方案.............................................................................................52.2锅炉控制的结构和原理..................................................................................62.2.1锅炉控制的结构.....................................................................................62.3串级系统的设计..................................................................................................72.3.1串级控制系统的设计..........................................................................82.3.2串级控制系统参数的整定................................................................82.4PID的算法.............................................................................................................92.4.1模拟PID......................................................................................................92.4.2数字的PID算法...................................................................................102.5纯滞后的算法.....................................................................................................112.5.1采样周期的分析...................................................................................12第三章控制系统的硬件设计...........................................................................133.1控制系统的硬件组成.....................................................................................133.2锅炉控制的系统...............................................................................................143.3PLC的选型及硬件配置................................................................................153.3.1模拟量输入模块SM331(AI8.12Bit)....................................153.3.2模拟量输出模块SM332(AO4.12Bit)....................................153.3.3控制系统的硬件组态..........................................................................163.4传感器选择.........................................................................................................163.4.1温度传感器............................................................................................163.4.2流量传感器............................................................................................173.5变送器选择.........................................................................................................173.6电磁调节阀选择................................................................................................183.7变频器MM420.......................................................................................................18第四章控制系统的软件设计...........................................................................194.1STEP7编程软件................................................................................................194.2PLC控制的程序设计.....................................................................................204.2.1主程序的设计.......................................................................................214
本文标题:基于PLC锅炉盘管出口水温滞后控制系统
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