基于主从结构微电网的控制运行和电能质量改善的-研究

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1、华中科技大学硕士学位论文AbstractBecauseofitscharacteristicofenvironmentalprotectionandadequatereserves,themicrogridbecomesmoreandmorepopularintheworld.Butatthesametimeitspowerqualityproblembecomesmoreandmoreprominenttoo.Inordertoimprovethepowerqualityinthemicrogrid,thispapermakesresearchesoncontrolmethodan

2、dpowerqualityofthemaster-slavestructuremicrogrid.Firstly,theresearchstatusofmircogridpowerqualityproblemissummarizedinthepaper.Thenitsmathematicalmodelisestablishedinbothofthreephasestaticabcframeanddqsynchronizationreferenceframe.AndthestructuresofthePQcontrolandtheV/fcontrolareinferredinthisp

3、aper.ThentheLCLfilterisusedastheoutputfilterofthegrid-connectedinvertertoreduceharmoniccurrent.TheLCLfilter’sparametersanditsperformancearealsodiscussedindetail.ThensimulationmodelsarebuiltinthePSCAD.Thesimulationresultsshowthatthemaster-slavestructuremicrogridcanworkstablyandtheLCLfiltercanimp

4、rovethemicrogridpowerqualityeffectively.Basedontheformerresearchesonthemicrogridpowerquality,thispaperpresentsanewcompositecontrolmethodofgrid-connectedinvertersandderivesitsworkingprinciple.Dependingoncontrollingtheoutputcurrentofthegrid-connectedinvertertofollowthecompositecommandcurrent,whic

5、hisconsistofthegridharmoniccurrentsignalandthePQcontrolsignal,theinvertercangenerateelectricityforthesystem,andcompensatereactivepowerandharmoniccurrentofthemicrogrid.AndthenthecurrentharmonicdetectionmethodandtheSVPWMcontrolmethodareanalyzedindetail.Thenthesimulationmodelofthecompositecontroli

6、sbuiltinthePSCAD.Thesimulationresultsshowthatthecompositecontrolmethodisaneffectivemethodtoimprovethemicrogridpowerquality.Finally,theTMS320F28335isusedasthemaincontrolchipintheexperimentplatform.Andthesystemprogramisdesigned.Atlast,theexperimentiscompleted.Theexperimentresultsshowthatthetheore

7、ticalanalysisandsimulationperformanceofthecompositecontrolarecorrect.II华中科技大学硕士学位论文Keywords:Microgrid,LCLFilter,Grid-connectedInverter,CompositeControl,PowerQualityProjectsupportedbytheNationalNaturalScienceFund(51477060)III华中科技大学