自动灌溉系统的设计VIP免费

电子与信息工程学院本科毕业论文论文题目基于PLC控制的自动灌溉系统的设计学生姓名程仕文学号103521008专业电气工程及其自动化班级103521指导教师汪洋2014年5月摘要水资源的合理利用具有十分重要的意义。相比发达国家，目前我国灌溉方式还存在一定差距。因此农业灌溉自动化成为一个重要的研究方向。PLC具有优良的技术性能，利用PLC控制的灌溉系统更加智能化、运行的可靠性更高。该设计介绍了可编程控制器（PLC）在自动节水灌溉控制系统中的应用，能根据不同类型的土地进行分类灌溉。系统按照A、B、C三种不同类型的作物的需水量分别采用不同灌溉模式，系统包括执行机构和控制机构两部分，执行机构主要是电动机作为驱动源，通过控制各电机的启动和停止来控制水泵工作，从而给作物进行灌溉。控制机构主要是可编程控制器。为了减少水泵电机的启动电流，减轻对电网形成的冲击，减少能耗，系统采用Y-△启动。关键词：PLC；自动灌溉；Y-△启动ABSTRACTRationaluseofwaterresourcesisofgreatsignificance.Comparedtodevelopedcountries,China'sirrigationmethodsarestillsomegaps.Therefore,irrigationautomationhasbecomeanimportantresearchdirection.PLChasexcellenttechnicalperformance,theuseofirrigationsystemsmoreintelligentPLCcontrol,higherreliability.Thisdesigndescribestheprogrammablecontroller(PLC)intheautomaticcontrolsystemofwater-savingirrigation,irrigationcanbeclassifiedaccordingtothedifferenttypesofland.SystemaccordingtowaterdemandA,B,Carethreedifferenttypesofcropswereirrigatedusingdifferentmodes,thesystemconsistsoftwopartsactuatorsandcontrolbodies,executiveagenciesaremainlymotorasadrivingsource,bycontrollingthestartandstopofthemotorstocontrolthepumptowork,givingthecropirrigation.Themaincontrolmechanismisprogrammablecontrollers.Inordertoreducethepumpmotorstartingcurrent,toreducetheimpactonthegridformation,reduceenergyconsumption,thesystemusesY-△start.KEYWORDS:PLC;Automaticirrigation;Y-△start目录1绪论........................................................................................................................................21.1课题背景及目的.............................................................................................................21.2课题研究现状.................................................................................................................21.2.1国外研究现状..........................................................................................................21.2.2国内发展现状..........................................................................................................21.3目的和意义.....................................................................................................................21.3.1研究目的..................................................................................................................21.3.2研究意义..................................................................................................................22灌溉系统总体方案................................................................................................................22.1总体设计.........................................................................................................................22.1.1灌溉综述..................................................................................................................22.1.2系统主要功能..........................................................................................................22.2系统运行结构图............................