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1、石家莊鐵道學(xué)院畢業(yè)設(shè)計(jì)(論文)摘要本論文根據(jù)中國城市小區(qū)的供水要求，設(shè)計(jì)了一套基于PLC的變頻調(diào)速恒壓供水系統(tǒng)。變頻恒壓供水系統(tǒng)由可編程控制器、變頻器、水泵機(jī)組、壓力傳感器、工控機(jī)等構(gòu)成。本系統(tǒng)包含四臺水泵電機(jī)，它們組成變頻循環(huán)運(yùn)行方式。采用變頻器實(shí)現(xiàn)對四相水泵電機(jī)的軟啟動(dòng)和變頻調(diào)速。壓力傳感器檢測當(dāng)前水壓信號，送入PLC與設(shè)定值比較后進(jìn)行PID運(yùn)算，從而控制變頻器的輸出電壓和頻率，進(jìn)而改變水泵電機(jī)的轉(zhuǎn)速來改變供水量，最終保持管網(wǎng)壓力穩(wěn)定在設(shè)定值附近。通過工控機(jī)與PLC的連接，采用組態(tài)軟件完成系統(tǒng)監(jiān)控，實(shí)現(xiàn)了運(yùn)行狀態(tài)動(dòng)態(tài)顯示及數(shù)據(jù)、報(bào)警的查詢。關(guān)鍵詞：變頻調(diào)速恒壓供水
2、PLC49石家莊鐵道學(xué)院畢業(yè)設(shè)計(jì)(論文)ABSTRACTAccordingtotherequirementofChina'surbanwatersupply,thispaperdesignsasetofwatersupplysystemoffrequeceycontrolofconstantvoltagebasedonPLC,andhavedevelopedgoodoperationmanagementinterfaceusingSupervisionControlandDataAcquisition.ThesystemismadeupofPLC,transducer
3、,unitsofpumps,pressuresensorandcontrolmachineandsoon.Thissystemisformedbythreepumpgenerators,andtheyformthecirculatingrunmodeoffrequencyconversion.Withgeneralfrequencyconverterrealizeforthreephasepumpgeneratorsoftstartwithfrequencycontrol,operationswitchadoptstheprincipleof”startfirstst
4、opfirst”.Thedetectionsignalofpressuresensorofhydraulicpressure,viaPLCwithsetvaluebycarryoutPIDcomparisonoperation,so,controlfrequencyandtheexportvoltageoffrequencyconverter,andthentherotationalspeedthatchangespumpgeneratorcometochangewatersupplyquantity,eventually,itisnearbytomaintainpi
5、penetpressuretostabilizewhensetvalue.ThroughworkcontrolmachinetheconnectionwithPLC,withgroupformsoftwareconsummatelysystematicmonitoring,haverealizedoperationstatedevelopmenttoshowanddata,reporttothepoliceinquiry.Keywords:Variablefrequencyspeed-regulatingConstant-pressurewatersupplyPLC4
6、9石家莊鐵道學(xué)院畢業(yè)設(shè)計(jì)(論文)目錄第一章緒論.........................................................11.1課題的提出...................................................11.2變頻恒壓供水系統(tǒng)的國內(nèi)外研究現(xiàn)狀.............................21.3本課題的主要研究內(nèi)容.........................................3第二章系統(tǒng)的理論分析及控制方案確定.........................
7、........42.1變頻恒壓供水系統(tǒng)的理論分析...................................42.1.1電動(dòng)機(jī)的調(diào)速原理.......................................42.1.2變頻恒壓供水系統(tǒng)的節(jié)能原理.............................42.2變頻恒壓供水系統(tǒng)的理論分析...................................52.2.1控制方案的比較和確定...................................52.2.2變頻概述....
