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1、摘要本論文根據(jù)中國城市小區(qū)的供水要求，設計了一套基于PLC的變頻調速恒壓供水系統(tǒng)。變頻恒壓供水系統(tǒng)由可編程控制器、變頻器、水泵機組、壓力傳感器等構成。本系統(tǒng)包含四臺水泵電機，它們組成變頻循環(huán)運行方式。采用變頻器實現(xiàn)對四相水泵電機的軟啟動和變頻調速。壓力傳感器檢測當前水壓信號，送入PLC與設定值比較后進行PID運算，從而控制變頻器的輸出電壓和頻率，進而改變水泵電機的轉速來改變供水量，最終保持管網壓力穩(wěn)定在設定值附近。通過工控機與PLC的連接，采用組態(tài)軟件完成系統(tǒng)監(jiān)控，實現(xiàn)了運行狀態(tài)動態(tài)顯示及數(shù)據(jù)、報警的查
2、詢。關鍵詞：變頻調速恒壓供水PLC31ABSTRACTAccordingtotherequirementofChina'surbanwatersupply,thispaperdesignsasetofwatersupplysystemoffrequeceycontrolofconstantvoltagebasedonPLC,andhavedevelopedgoodoperationmanagementinterfaceusingSupervisionControlandDataAcquisition.T
3、hesystemismadeupofPLC,transducer,unitsofpumps,pressuresensorandcontrolmachineandsoon.Thissystemisformedbythreepumpgenerators,andtheyformthecirculatingrunmodeoffrequencyconversion.Withgeneralfrequencyconverterrealizeforthreephasepumpgeneratorsoftstartwith
4、frequencycontrol,operationswitchadoptstheprincipleof”startfirststopfirst”.Thedetectionsignalofpressuresensorofhydraulicpressure,viaPLCwithsetvaluebycarryoutPIDcomparisonoperation,so,controlfrequencyandtheexportvoltageoffrequencyconverter,andthentherotati
5、onalspeedthatchangespumpgeneratorcometochangewatersupplyquantity,eventually,itisnearbytomaintainpipenetpressuretostabilizewhensetvalue.ThroughworkcontrolmachinetheconnectionwithPLC,withgroupformsoftwareconsummatelysystematicmonitoring,haverealizedoperati
6、onstatedevelopmenttoshowanddata,reporttothepoliceinquiry.Keywords:Variablefrequencyspeed-regulatingConstant-pressurewatersupplyPLC31目錄第一章緒論.........................................................11.1課題的提出.................................................
7、..11.2變頻恒壓供水系統(tǒng)的國內外研究現(xiàn)狀.............................21.3本課題的主要研究內容.........................................3第二章系統(tǒng)的理論分析及控制方案確定.................................42.1變頻恒壓供水系統(tǒng)的理論分析...................................42.1.1電動機的調速原理...............................
8、........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...............................................62.2.3
