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3、摘要本論文根據(jù)中國城市小區(qū)的供水要求，設(shè)計了一套基于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、水泵機組、壓力傳感器等構(gòu)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(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(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)、報警的查詢。關(guān)鍵詞：變
4、頻調(diào)速恒壓供水PLC
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6、ABSTRACTAccordingtotherequirementofChina'surbanwatersupply,thispaperdesignsasetofwatersupplysystemoffrequeceycontrolofconstantvoltagebasedonPLC,andhavedevelopedgoodoperationmanagementinterfaceusingSupervisionControlandDataAcquisition.Thesystemismadeup
7、ofPLC,transducer,unitsofpumps,pressuresensorandcontrolmachineandsoon.Thissystemisformedbythreepumpgenerators,andtheyformthecirculatingrunmodeoffrequencyconversion.Withgeneralfrequencyconverterrealizeforthreephasepumpgeneratorsoftstartwithfrequencycontrol,operatio
8、nswitchadoptstheprincipleof”startfirststopfirst”.Thedetectionsignalofpressuresensorofhydraulicpressure,viaPLCwithsetvaluebycarryoutPIDcomparisonoperation,so,controlfrequencyandtheexportvoltageoffrequencyconverter,andthentherotationalspeedthatchangespumpgeneratorc
9、ometochangewatersupplyquantity,eventually,itisnearbytomaintainpipenetpressuretostabilizewhensetvalue.ThroughworkcontrolmachinetheconnectionwithPLC,withgroupformsoftwareconsummatelysystematicmonitoring,haverealizedoperationstatedevelopmenttoshowanddata,reporttothe
10、policeinquiry.Keywords:Variablefrequencyspeed-regulatingConstant-pressurewatersupplyPLC
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12、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.............................2
13、1.3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.................................42.1變頻恒壓供水系統(tǒng)的理論分析...................................42.1.1電動機的調(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
14、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
