污水处理模糊控制系统的设计

漳州师范学院毕业论文（设计）污水处理模糊控制系统的设计TheDesignoftheBoilerDrumWaterLevelControlSystemwithPLC姓名：学号：050505144系别：物理与电子信息工程系专业：电气工程及其自动化年级：2005级指导教师：2009年5月15日漳州师范学院毕业设计I摘要文章分析了城市污水的处理工艺过程，以序列间歇活性污泥法（SBR）为研究形式。实现了以PLC为控制核心，以曝气池中溶解氧浓度（DO）作为模糊控制参量的模糊控制。系统以鼓风机的转速为被控变量，论述了PLC与变频器之间基于RS-485的通讯原理。控制鼓风机的转速，从而实现了对曝气量的精确控制。关键词:模糊控制；PLC；变频调速；污水处理；通讯AbstractTheboilerisnumerousessentialimportantpowerequipmentofindustrialdepartment.So,theboilerhasoftenbecomeanindispensablepartofmanyfactories.Therefore,itisessentialforautomaticcontrolsystemintheboilerequipmenttoresearch.Thewaterlevelcontrolsystemoftheboileristhattheboilerproducesthemostimportantlinkinthecontrolsystem.Iftheproductionoperationoftheboilerisunreasonable,itisimpropertodealwith,andwilloftencausetheaccident.Themajorityintheseaccidentsiscausedbecauseofimproperincontrolthewaterleveloftheboiler.Thatcanseetheimportanceintheequipmentcontrolsystemoftheboilerofcontrolofwaterlevelofsteamdomeoftheboiler.Theauto-controlofthedrumwaterlevelisveryimportant.Thedrumwaterlevelisanimportantvariabletobecontrolled,itishardtogetthemathematicmodelofthewaterlevelwithadjustprocess.Itischaracteristicofnonlinearity,instabilityandtimelag.Thetraditionalcontrolmodeofthree-variableinthedrumwaterlevelmostusePID,theeffectofitcanbeimproved.Thefuzzycontroldoesnotneedprecisemathematicmodelofthecontrolledobject,itonlyneedstheexperienceofoperatorandthedateofoperatingithasgoodrobustnessanditfittocontrolthesystemwithnonlinearityandlag.Keywords:Drumwaterlevel,Fuzzy-PID,Three-variable漳州师范学院毕业设计II目录摘要...................................................................................................................................................................IABSTRACT.........................................................................................................................................................I引言........................................................................................................................................................................12.污水处理工艺介绍...........................................................................................................................................12.1城市污水的污染指标..................................................................................................................................12.2城市污水处理工艺.....................................................................................................................................22.3SBR污水处理工艺与曝气环节的作用......................................................................................................33曝气过程控制方案选择......................................................................................................................................33.1PID控制......................................................................................................................................................33.2模糊控制.....................................................................................................................................................43.2.1模糊控制原理.....................................................................................................................................43.2.2模糊控制器的设计步骤.....................................................................................................................53.3控制方案的选择.......................................................................................................................................104曝气环节控制方案的设计...............................................................................................................................104.1总体方案的设计.......................................................................................................................................104.2硬件配置....................................................................................................................................................115.控制系统的实现.............................................................................................................................................125.1仪器、仪表的选型...................................................................................................................................125.2PLC接线图................................................................................................................................................125.3系统电气图...............................................................................................................................................135.4控制系统流程图.......................................................................................................................................135.4.1主程序设计......................................................................................................................................135.4.2模糊控制流程图...............................................................................................................................145.4.3变频器通讯流程图..........................................