恒压供水系统的PLC控制设计.doc

@@@学院本科毕业设计（论文）摘要PAGE\*MERGEFORMATI摘要随着城市经济的发展，城市高楼不断的增高，城市区域不断扩展，城市供水开始出现压力不足的问题，水是人类生活的必须品，传统的供水系统已经不能满足现代城市的需要。需要一个新的供水系统，要保证城市供水的压力恒定，满足用户，并且节约能耗，自动调节，便于维护。本设计针对上述问题，通过对现代控制技术的研究，对不同的恒压供水系统进行比较和分析，采用变频器结合PLC的控制方案，来解决恒压供水问题。以PLC与变频器控制水泵电机工作，实现运行可靠、节能、低噪，维护简单，经济实用的恒压供水系统。这个系统能自动控制水泵转速，实时读入管网压力值，与设定值比较，由PID控制算法得出一调节参量，控制调速泵的转速，最终实现恒压供水。关键词变频器，恒压供水，PLCABSTRACTWiththedevelopmentofcityeconomy,increasedcontinuouslycitybuilding,cityexpandingregional,citywatersupplybegantoappearthepressureofshortage,thewateristhehumanlifenecessities,traditionalwatersupplysystemhasbeenunabletomeettheneedsofmoderncity.Theneedforanewwatersupplysystem,toensuretheconstantpressureofcitywatersupply,satisfytheuser,andsavesenergyconsumption,automaticadjustment,convenientmaintenance.Thispaperinviewoftheabovequestion,throughthestudyofmoderncontroltechnology,comparisonandanalysisofdifferentcombinationofconstantpressurewatersupplysystem,thecontrolschemeofPLCconverter,tosolvetheproblemofconstantpressurewatersupply.PLCandinvertercontrolpumpmotor,toachievereliableoperation,energysaving,lownoise,easymaintenance,constantpressurewatersupplysystemiseconomicalandpractical.Thissystemcanautomaticallycontrolthepumpspeed,real-timereadintothepipenetworkpressurevalue,comparedwiththesetvalue,controlledbythePIDalgorithmtoobtainacontrolparameter,controlthespeedofthepump,theultimaterealizationofconstantpressurewatersupply.Keywords：Speed-frequencyvariable,Constantpressurewatersupply,PLC目录TOC\o"1-3"\h\uHYPERLINK\l_Toc6136摘要PAGEREF_Toc6136IHYPERLINK\l_Toc9717ABSTRACTPAGEREF_Toc9717IIHYPERLINK\l_Toc12241绪论1HYPERLINK\l_Toc295341.1研究背景PAGEREF_Toc295341HYPERLINK\l_Toc220431.1.1城市供水需求PAGEREF_Toc220431HYPERLINK\l_Toc295261.1.2传统供水系统的比较PAGEREF_Toc295261HYPERLINK\l_Toc62711.2恒压供水系统的国内外研究现状PAGEREF_Toc62713HYPERLINK\l_Toc27861.3供水系统安全性讨论PAGEREF_Toc27864HYPERLINK\l_Toc176171.4本论文主要设计思想PAGEREF_Toc176174HYPERLINK\l_Toc326902系统的理论分析及方案的确定PAGEREF_Toc326906HYPERLINK\l_Toc311