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1、AbstractThispaperintroducesthevariablefrequencytechnology,thedevelopmentandtrendsofcycloconvertertechnologyathomeandabroad,thenintroducesthedouble-variablecontroltheory,thebasicharmonictheoryinthevariable-frequencysystem.Combiningtheresultsofpreviousstudie
2、d,analysestheadvantagesofsix-wavecycloconvertercomparedwiththethree-waveconverter,especiallyontheharmonics.Forthefrequencybandswithpoorwaveformsymmetry,itfindsawaytooptimizetheoutputwaveform–accordingtothedemandofthewaveformfromoutputspeed,underthepremiseo
3、fmeetingtheconditionsofpositiveandnegativegroupofthyristorsconduction,usespatchworkmethodtogivedifferentthyristorsdifferentpulsetriggeringmoments,analysesandcalculatestheloadimpedanceangleofdifferentfrequencybands,besidestheprincipleofselectingthetriggerpu
4、lsewidth,todeterminethepulsewidthofthedifferentfrequencybandsinordertoinhibitoutputsignalharmonicsfromtheconverteritselfespeciallytheevenharmonicscomponent.First,itsimulatesbasedonuseMATLAB/Simulinkandthendoesexperimentbasedondifferentfrequencybands.Compar
5、ingandsummarizingalargenumberofresultsfromthesimulationandtheactualexperiments,givesharmonicsituationofthesamebandwithdifferentmodulatedwaves,thesamemodulationwavewithdifferenttriggertimer,andpointsoutthatthetriggertimerandwidthshouldbeconsideredfromthesin
6、edegrees,thesymmetryandbalancedegree.Inaddition,thispaperintroducestherelativeapplicationofdwinHMItouchscreenLCDmodules,givesthewaveformofvoltageandmotorspeedshowedbyLCDmodules,plottsthemotorspeedwavecurveinMATLABbasedonspeeddatapickedfrommotorloadexperenc
7、e.Keywords:double-variablecontrol;six-wavecycloconverter;patchworkmethod;harmonicsuppressionIII万方数据万方数据目录摘要..................................................................................................................................I目录................
8、.................................................................................................................V1引言...........................................................................................
