變壓器冷卻器的模糊控制系統(tǒng).pdf

1、華中科技大學(xué)碩士學(xué)位論文變壓器冷卻器的模糊控制系統(tǒng)姓名：張小景申請學(xué)位級別：碩士專業(yè)：電工理論與新技術(shù)指導(dǎo)教師：汪建20110106II華中科技大學(xué)碩士學(xué)位論文AbstractAbstractBothcewindingcangenerateenergylosseswhichwillchangeintoheatwhenthetransfmerisatruntime.Theheatwillmakethetemperatureofthetra

2、nsfmerhigherconsequentlyquickenthetransfmer’sageingreducethetransfmer’sservicelife.Therefethetransfmermustbeequippedwithcoolingdevices.Theoilimmersedtransfmeristhemostwidlyusedwhosecoolingmodeincludesnaturaldraft(air)coo

3、lingfcedaircoolingfcedoil–aircooling.Therelaysystemwhichisusedinthetraditionaltransfmer’scoolingcontrolusuallyhascomplicatedwiringmultifariouscomponentsmanyfaultpointswhatismeitcanonlywkatthecommercialfrequencywhichwillc

4、auseunnecessaryelectricalwastewhentemperatureriseisnothigh.Thisdissertationdiscussesthecedoil–aircooleratlengthdesignsanewcoolingcontroller.FirstlythepaperreviewsthetraditionalPIDtemperaturecontrolsystemwhichemployedthet

5、opoiltemperatureasinputthePIDcontrollertomakethecooleronoff.Thiscontrolmodewasbetterinthefunctionofautomationcommunicationbutontheotherhitcannotresolvethenoiseproblemwhenthecoolerwasatstartupcannotchangefrequencysmoothly

6、.InconsiderationofthenatureofthetemperaturecontrolsystemMamdanifuzzysystemisproposedwhichusesbothtopoiltemperaturecurrentloadasinputsSiemensS7300PLCasprocesstochangetheoutputofthefrequencyconvertertocontrolthecooler.Thef

7、requencyconvertermayhelplowerthenoisereducethelossesoftheelectricalenergymakethecoolersoftstart.Tomeettothedemofthetransfmer’sintelligentcontrolthecoolingcontrollersupptsremotelocalfunctionautomatilcmanualfunctionthepape

8、ralsodesignsacoolerminitingsystemwhichmakesuseofSiemensWincc6.0asdevelopmentsoftwareofthehostcomputerSiemensS7300PLCasthelowercomputerPROFIBUSasthecommunicationstard.Thissystemiscomprisedofprintingreptsonlinemonitingdata