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目录中文摘要...............................................................................................................................1中文摘要...............................................................................................................................21绪论...................................................................................................................................31.1课题研究的目的与意义..........................................................................................31.2国内外发展的状况..................................................................................................31.3变频供水系统应用范围..........................................................................................51.4恒压供水的实现......................................................................................................52变频调速系统能耗分析...................................................................................................72.1供水系统分析..........................................................................................................72.2变频调速恒压供水工况与能耗机理分析..............................................................83系统结构与设备选型.....................................................................................................113.1系统总体设计........................................................................................................113.2变频调速................................................................................................................113.3单片机....................................................................................................................163.4控制算法................................................................................................................174系统硬件设计.................................................................................................................204.1系统工作过程说明................................................................................................204.2变频器部分硬件设计............................................................................................214.3单片机部分硬件设计............................................................................................235系统软件设计.................................................................................................................295.1主程序流程............................................................................................................295.2继电器动作控制流程............................................................................................305.3PID控制流程..........................................................................................................31结论.....................................................................................................................................33致谢.....................................................................................................................................34参考文献.............................................................................................................................35附录1..................................................................................................................................36附录2..................................................................................................................................371单片机恒压供水系统的设计摘要：建设节约型社会，合理开发、节约利用和有效保护水资源是一项艰巨任务。根据居民用水时间集中，用水量变化较大的特点，因此居民原供水系统存在了耗能高，可靠性低，水资源浪费严重，管网系统待完善的问题。提出利用压力反馈，PID控制，配以变频器、单片机、压力传感器等，根据管网的压力，通过变频器控制水泵的转速，从而使管网中的压力始终保持在合适的范围。从而解决因楼层太高而导致压力不足及小流量时能耗大的问题。另外水泵耗电功率与电机转速的三次方成正比关系，所以水泵调速运行的节能效果非常明显，平均耗电量较通常供水方式节省近四成。结合使用可编程控制器，可实现主泵变频，副泵软启动，具有短路保护、过流保护功能，工作稳定可靠，电机的使用寿命大大延长。关键字：恒压变频供水，单片机，差压供水，自动控制2TheDesignbaseonMCUforpressurewatersupplysystemAbstract：Buildingtheconservation-orientedsociety,thereasonabledevelopment,savesandtheeffectiveprotectingwaterresourcesisanarduoustask.Accordingtotheuserswaterusedtimeandthewaterconsumptionchangingcharacteristic,sotheresidentoriginalwatersupplysystemhasmanyproblems.E.g.theexistencecosttobehigh,thereliabilityislow,thewaterresourceswaste,andthepipenetworksystemneedconsummation.Throughthewayofusingpressurefeedback,PIDcontrol,togetherwiththeconverter,microcontroller,pressuresensors,etc,accordingtothenetworkmanagementpressure,controlwaterpumprotationalspeedthroughtheinverter.Sothatthepressureinthepipenetworkisalwaysmaintainedataappropriatescope.Throughthisway,wesolvetheproblemthatthehighfloorcaseinadequatepressureandenergyconsumptionhighwhentheflowislow.Moreoverthewaterpumpconsumestheelectricpowerandtheelectricmachineryrotationalspeedisproportionalthreecubedtherelations,thereforethewaterpumpvelocitymodulationgetsanobviousenergyconservationeffect.Theaveragepowerconsumptionsaves40%thanusualwatersupplymethod.Combinationofrelays,itcanachievethemainpumpfrequencyadjust,thedeputypumpsoftstart,withthefunctionofshortcircuitprotectionandovercurrentprotection.Itisstableandreliablefurthermoregreatlyextendthelifeofthemotor.Keywords:Constantpressurefrequencyconversionwatersupply,SC