微网稳定控制器的运行特性分析和控制研究

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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