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ID:34223531
大小:6.39 MB
页数:66页
时间:2019-03-04
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1、华北电力大学硕士学位论文AbstractTherearethreehierarchiesintheresearchofmiro—gridoperationcontrol:micro·-sourceinverter,controltechniqueofmicro·-sourceandcontrolstrategyofmicro-grid.Now,thetechniquesofmicro-SOurCe,whichareusuallyrelizedthroughPIDcontrollers,arealmostbasedonthesimulationtotrid
2、itionalgenerationscontrol,SOtherearemanyshortcomesandproblems,anditisoneofmicro-gridcontroldifficultiestobeinvestigatedtofurtherimprovethepresentcontroltechniques;whilethecoordinationofmulti-micro—sourcesandthestabilityofmicro—gridisthekeyofmicro·gridcontr01.Twokindsofimprovedmic
3、ro—SOurCeScontroltechniquesandonekindofimprovedcontrolstrategywereproposedinthepaper.Oneofimprovedcontroltechniqueisdroopcurveimprovesmethod,inwhichakindofdroopcontrolstrategybasedonnonlineardroopcharacteristicsimilartothatofmagnetichysteresisisproposed,throughreal—timechangingdr
4、oopgaincorrectly,toeffectivelysuppressthewidefluctuationsoffrequencyandvoltage,therebyimprovingstabilityofthesystem.Theotherisnonlinearoptimalmethod,inwhichtheinertialblockandtheideaofnonlinearquadraticformoptimumcontrolisappplied,tosolvetheproblemofquickfrequencyvariationswhenth
5、eloadchanges.Themicro—sourcesimulationmodelwiththetwoimprovedmethodsisbuiltinPSCAD,andtheresultsjustifyitseffectiveness.Inordertosolvetheproblemofstabilityofislandingmicrosourcewhentherearebigdifferencebetweensupplyanddemandofenergy,akindofcontrolstrategyincludingtheschemeofconve
6、rsionbetweengrid—connectedmodeandisolatedmodeandtheschemeofover-frequencygeneratortrippingandunder-frequencyloadsheddingisproposed·Duringthecourseofstudy,Ifoundthatthelackofresearchonmicro-gridinterconnectionstandardslimitsthedeepresearchandfurtherapplicationofmicro-grid,SOtheint
7、erconnectionstandardsframeworkincludingthirteenclausesiSextactedfromtensofnewenergyinterconnectionstandards,andtherelatedcontentsineachclausearedealtwithmoredetails.Furthermore,thetermsofschemeofconvertionbetweengrid-connectedmodeandisolatedmodeandtheschemeofover-frequencygenerat
8、ortrippingandunder-frequencyloadshedding
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