水泵电机串级调速系统设计

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1、摘要摘要对于不同的水厂来说，电费约占据供水成本的百分之三十左右。目前，在许多供水水厂中，大多数水泵都是采用恒速电机拖动，当水量需要调节时采用闸门节流的办法来实现流量的调节，这样就会产生非常严重的电能资源浪费。随着电力半导体的发展，串级调速系统渐渐被采用。串级调速是通过在转子绕组上加一个附加电势通过调节转差率来实现调速。串级调速能实现无级平滑调速，低速时机械特性比较硬。特别是晶闸管低同步串级调速系统，技术难度小，性能比较完善获得了广泛应用。本次设计主要是通过对主回路以及控制回路进行参数计算进而选择相应的元器件实现对水泵电机的串

2、级调速，最终达到要求的指标。关键词：异步电机，反馈，无功功率-31-英文摘要AbstrsctFordifferentWaterworks,electricityoccupyalargepartofthecostofwatersupplyaboutthirtypercentorso.Atpresent,manykindsofpumpuseaconstantspeedmotorininwatersupplyinwaterworks.whenwaterneedtoadjustthegatewehavetotakethewaytor

3、ealizethethrottlingflowcontrol,thereareveryseriouspowerwasteofresources.Inthespeedregulationsystems,cascadecontrolgraduallybeenwidelyapplied,alongwiththedevelopmentoftheelectricpowersemiconductor.Cascadecontrolisauniquewindingtypemotorspeedway,anadditionalpotential

4、isusedbycascadecontrolintherotorwindingtoadjustthesliptorealizethepotentialofspeed.comparedwiththerotorresistance，thespeedofcascadecontrolcanturnthemotorpowertothepowergridorpoorfeedbackintomechanicalenergysentingbacktothemotorshaft,soitisbeneficialtotheimprovement

5、ofefficiency.Astoso-calleddoubly-fedspeedregulation，itistopointtowillpowerfeedbacktowoundrotorasynchronousmotorstatorwindingsandrotorwinding.ItUsuallymakestatorwindingaccesstoindustrialfrequencypower,willrotorwindingflatrate,fromamplitude,phasesequence,etccanadjust

6、feedbackonelectricalsignals,sothattheycanadjustwoundrotorasynchronousmotortorque,rotationalspeedandmotorstatorsideofreactivepower.Keywords:asynchronousmotor,feedback,reactivepower-31-目录目录摘要…………………………………………………………..…………………...ⅠABSTRACT…………………………………………………………………………Ⅱ目录……

7、………………………………………………………..……………..….Ⅲ第一章概论……………………………………….…….………..….…………..11.1水厂的基本情况及发展概论…………………….…….……….......…..…......11.2交流电机的调速发展概况及优缺点…………...…..…………...……......…...11.2.1交流调速的类型…………………………………………………..…….....11.2.2交流电机串级调速的优缺点……………...…………….…..…....……….21.3设计内容与技术指标…

8、……………………………....……........….……..…..3第二章串级调速系统的设计方案…………….……....……..…......……...….......42.1串级调速方案论证…………………………………….…………..........…..…42.2双闭环控制串级调速系统