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ID:34223512
大小:10.72 MB
页数:66页
时间:2019-03-04
《微网稳定控制器的运行特性分析和控制研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、万方数据华北电力大学硕士学位论文AbstractMicrogrid,asanimportantformofutilizationofrenewableenergy,takingadvantageofthecharacteristicsofrenewableenergy,suchasdispersivedistributionandvarietyofforms,managetheenergyinonenetwork,whichgreatlyimprovestheefficiencyandreliablity.Domesticandoversearesea
2、rchindicatetheimportanceofenergystorageinmicrogrid.Energystoragecancontrolthepowerexchangewithmaingridbycompensatingthepowerfluctuationofrenewableingrid—connectedmode,andalsocanestablishvoltageandflequencyforloadsanddistributedgeneratorandmaintainthesteadyoperationofmicrogridini
3、slandingmode.Thecontrolperformanceoftheenergystorage-basedinvertercaninfluencethepowerqualityofmicrogrid.Thisthesisconductsthethoroughresearchonoperatingcharacteristicsandcontrolstrategyofenergystorage.basedinverterwhichisnamedmicrogridstabilitycontrollerhere.1、Basedonthebasicst
4、ructureofmicrogridandmaintopologyofmicrogridstabilitycontroller,mathematicalmodelofmicrogridstabilitycontrollerinislandingmodeisestablished.Threecontrolstrategiesutilizedinislandingmodewhenconnectingwithlinearloadsarecompared,theresultsofsimulationandexperimentvalidatethecorrect
5、nessofthecontrolstrategy.2、Mathematicalmodeofmicrogridstabilitycontrolleringrid—connectedmodeisestablished,basedonwhichcontrolstrategyandislandingdetectionmethodinidealgridvoltageconditionaredesigned,theresultsofsimulationandexperimentverifytheeffectivenessofthecontrolstrategies
6、.3、Controlstrategyofmicrogridstabilitycontrollerwhenconnectingwithnonlinearloadinislandingmodeisstudied.Thestructureanddrawbackofrepetitivecontrolareanalyzed,improvedmethodisproposed,Finallytheproposedmethodisvalidatedbysimulationandexperimentresults.4、Phaselockedloop(PLL)method
7、isanalyzedunderunbalancedgridvoltage.BasedonthemathematicalmodeofPLLunder.unbalancedvoltage,newPLLmethodisproposedandverifiedbysimulationandexperimentresults.5、Dual.PIcontrolschemeindqreferenceflameunderunbalancedconditionisanalyzed,controlstrategytoeliminatethedouble-frequencyr
8、ippleinactivepowerandreactivepowerbyemployingra
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