基于諧波電流注入式整流變壓器的變流系統(tǒng)的研究.pdf

1、湖南大學碩士學位論文基于諧波電流注入式整流變壓器的變流系統(tǒng)的研究姓名：吳浩申請學位級別：碩士專業(yè)：電氣工程指導(dǎo)教師：張志文20100414碩l：學位論文AbstractTraditionalconvertingsystemwhichusesalargenumberofnon—linearpowerelectroniccomponentshasalargenumberofharmoniccurrentwhichinjecttothepow

2、ergrid，therefore，itcausestOdeclinethepowerqualityandincreasethelossInordertosuppressharmoniccurrentandimprovepowerfactor，thetraditionalfilteringschemeusespassivefilterinthesideofgrid，however，passivefiltercanonlycompensat

3、eforfixedfrequencyharmoniccurrentandmayappeartheresonance，atthesametime，itiseasilyaffectedbytheimpedanceofpowergridButactivepowerfilterisnotbeenusedinlargescaledomainbecauseofthelimitoftheprice，thedevice’Scapacity，voltag

4、e’SgradeandothersThehybridactivefilterwhichcombinesitsrespectiveadvantagesofactivefilterandpassivefilterhasbecomethemajorfocusoftheresearchonthesuppressingharmoniccurrentandthecompensationofreactivepowerThisthesiscombine

5、swiththetopicoftheGreenEnergysavingDCStationwhichisthekeyscience&technologyprojectof06GK1003—1intheEleventhFiveYearPlanofHunanProvinceThestudyfocusesonthefollowingaspects：(1)Anewfilteringschemewhichcombineswiththetechnol

6、ogyofthenovelinductivefilterandhybridactivepowerfilterispresentedinthepaperTheworkingprincipleandgeneralstructureofthenewconvertingsystembasedonthenovelrectifiertransformerareintroducedinthethesisThefilteringprincipleoft

7、henewconvertingsystemisderivedfromitsequivalentmathematicalmodel(2)Anoverviewofthevariousdetectionmethodofharmoniccurrentwhichhasbeendividedintotwobroadcategoriesaccordingtothedefinitionofthepowerandthetheoriesofdigitals

8、ignalprocessingisgiveninthispaperBecauseoftherelayprotectionandtheimbalanceofthesystem，thedetectionmethodofharmoniccurrentbasedondoubledqtransformationisproposedItsschematicdiagramandformulaaregivenThenovelalldigitalphas

9、e—lockedloopwhichcantrackgrid’SfrequencyinrealtimeisproposedThroughtheanalysisofthesimulationandexperimentalresults，itisdemonstratedthattheprincipleofthenovelall—digitalphase—lockedloopiscorrectandfeasible(3)Thevariousco