微电网的建模、仿真及运行特性分析

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1、天津大学硕士学位论文微电网的建模、仿真及运行特性分析姓名：李旭光申请学位级别：硕士专业：电力系统及其自动化指导教师：李永丽20090601ABSTRACTWiththerapiddevelopmentoftheworldindustryandeconomy,theenergycrisisisshowingbeforethehumans．Meanwhile，themalpracticeofsuperlarge—scalepowersystemappearincreasingly,andthevulnerabilityoft

2、hegridhasbeenfullyexposed．Basedonthis，thedistributedgenerationtechnologywithrenewableenergyasthemainenergyhasgotthefastdevelopment．Inordertocoordinatethecontradictionbetweenthelarge鲥danddistributedgeneratorsandtOfullyexploitthevalueandbenefitthatdistributedgenera

3、torsbringtothegridandusers，microgridappears．Asaneffectivesupplementtothegadandaneffectiveutilizationformofdistributedenergy,thedevelopmentofmicrogadhaschangedthesinglepowersupplypatternandhasgreatlyimprovedpowersupplyreliabilityandefficiency．Asthetachebetweengada

4、nddistributedgenerators，thegrid—connectedinverterhasacriticinfluencetotheinterconnectionperformanceofthedistributedgenerators．Inthispaper,thecharacteristicsandthecontrolprincipleofthedistributedgeneratorswithinverter-basedinterfacealeanalyzed．Accordingtothemathem

5、aticmodelindqframe，PQandWfcontrolstructuresaredesigned．MicrogfidCanoperatewhenconnectingtothelarge鲥dandalsocanruninislandmodewhenfaultshappenorasnecessary．Thekeypointwhetherthemicrogadrunreliablydependsonifitmeetsthepowerqualityoftheload．Traditionalcontrolconside

6、rsthatdistributedgeneratorsshouldadoptdifferentcontrolstrategiesindifferentmodes．Itisclearthatthismayleadtoacontrolfailurewhenswitchingtheoperationmodeandmakethecontrolcomplicated．Inresponsetothisproblem,anewformofmicrogridcomposedofaconstantpowerdistributedgener

7、atorandaenergystoragedeviceissuggestedinthispaper．TheconstantpowerdistributedgeneratoradoptsthePQcontrolstrategyandtheenergystoragedeviceadoptstheV／fcontrolstrategy．Theenergystoragedevicecompensatestheactiveandreactivepoweraccordingtothechangeofthevoltageandthefr

8、equency．Themicrogridnotonlycanworkconnectingthelargegadbutalsocanworkinislandmode．Moreimportantly,thecontrolstrategiesneednottobechangedwhileswitchingtheoperat