双管Buck-Boost变换器的输入电压前馈控制方法

南京航空航天大学硕士学位论文双管Buck-Boost变换器的输入电压前馈控制方法姓名：曹伟杰申请学位级别：硕士专业：电力系统及其自动化指导教师：阮新波2011-03IDC-DCDC-ACDC-DCBuck-BoostBuckBoostDC-DCBuckBoost250V~500V360V3kWBuck-BoostBuck-BoostIIABSTRACTInordertosolvetheenergycrisisandenvironmentpollution,therenewableenergygenerationsuchaswindenergyandsolarenergyhasbeenreceivingmoreandmoreattentions.Sincethewindenergyandsolarenergyarestronglyaffectedbyclimateandweather,theoutputvoltagevariesinawiderange.Ingeneral,thegrid-connectedinverterconsistsoftwostages.Thefirststageisadc-dcconverter,whichconvertsthevariabledcinputvoltageintoastabledcvoltage;andthen,thesecondstagedc-acinverterconvertersthestabledcvoltageintotheacvoltage.Thisthesisisdedicatedtothefirststagedc-dcconverter.Thetwo-switchbuck-boostconverterischosenasthefirststagedc-dcconverter,whichcanoperateinbuckmodeandboostmode,thusachievesahighefficiencyovertheentireinputvoltagerange.Inthisthesis,asingle-regulatortwo-carriertwo-modecontrolstrategyisused,anditcanchoosethesuitableoperatingmodeautomatically.Inordertodepresstheoutputvoltagevariationwheninputvoltagehasastepchange,aninputvoltagefeedforwardcontrolstrategyisproposedinthisthesis.Theinputvoltagefeedforwardfunctionsofbuckmodeandboostmodearederived,andthefeedforwardcoefficientofthetwomodesaredifferent.Byusingtwomodulatingsignalsitcanchoosethecorrespondinginputvoltagefeedforwardbranchautomaticallytoregulatetheoutputvoltageunderdifferentmodes,andtheoutputvoltagecankeepstablenomattertheoperatingmodeoftheconverterchangesornot.A3kWprototypewithinputvoltageof250V–500Vandoutputvoltageof360Visfabricatedandtestedinthelab.Thesimulationandexperimentalresultsaregiventoverifytheeffectivenessoftheproposedinputvoltagefeedforwardcontrolstrategy.KeyWords:two-switchbuck-boostconverter,controlstrategy,two-carriermodulation,modetransfer,inputvoltagefeedforward.V1.1.....................................................................................................................11.2.....................................................................................................21.3.........................................................................................................21.4.........................................................................21.5BuckBoost.....................................................................................................31.6BuckBoost.....................................................................31.7BuckBoost.................................................................................................41.8Buck-Boost...........................................................................................................41.9Buck-Boost....................................................................51.10Buck-Boost..................................................................61.11.......................................................................61.12...............................................................................................72.1.................................................................................................92.2.......................................................................102.3d1d2ve..........................................112.4.......................................................................112.5d1d2ve..........................................123.1Buck..............................................................................................................143.2Boost.............................................................................................................143.3...............................................................................................................153.4PIBode.............................................................................................163.5Bode............................................................................173.6.......................................................................183.7...............................................................................................................193.8.......................................................................................................193.9...................................................................................203.10Boost...................................................................................................21Buck-BoostVI3.11.................................................223.12BuckBoost.....................................................................233.13.....................................................................................................243.14Buck.......................................................................253.15Boost.......................................................................263.16BuckBoost........................................................274.1...................................................................................................................304.2..