微电网频率稳定及其控制方法研究

《微电网频率稳定及其控制方法研究》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、万方数据东南大学硕士学位论文关键词：微电网；微电源；频率特性；下垂控制；离网运行；协调控制Ⅱ万方数据ABST受ACTABSTRACTIntherecentyears，distributedgeneration(DG)haswonrapiddevelopmentwiththeadvantagesofsmallinvestment,environment-friendly,reliablepowersupplyandgenerationflexible．Thus，micro一面dobtainedrapiddevelopmentworkingasaIniTli·酣dtocoor

2、dinatethecontradictionbetweenDGandmain酊d．Differentfromthetraditionalgrid，activepowervacancywillcauseviolentfluctuationinmicro—gridduetoitsfeatures，whichcanhavesideeffectonreliabilityandqualityofthesystem．Thebiggestdistinctionbetweentraditionalgridandmicro-gridisthe够peofsource．BecauseDGhas

3、awiderangeofspeciesanddifferentrunningcharacteristics，thepaperestablishthetypicalcontrolmodelofDGssuchasP—Qcontrol，v．fcontrol，droopcontrolandspeedcontrolsystemofsynchronousmotor．BasedonthesimulationmodelinMatlab／Simulinkplatform，therunningcharacteristicsofvariousDGsandtheirabilitytocontro

4、lfrequencyCallbedetermined．Thefrequencycharacteristicsofthemicro-gridflEedependonallthemicro—sourcesinit．Sobasedonthepreviousanalysisofthepower-frequencycharacteristics，thispaperstudiedhow缸leyaffectthefrequencyinmicro．grid．Forthefixedcoe伍cientof血econventionaldroopcontrolmethod，itisdifficu

5、lttodistributeloadsopportunelyandkeepsystemfrequencystablewhenthedistributedgeneratorsareworkingintheislandingmode．Consideringtheoutputpowerandthestateofcharge(soc)oftheenergystoragesystem(Ess)asthelocalinformation,thispaperproposesanimproveddroopcontrolmethodwhichCanadjustthedroopcoeffic

6、ienttimely．Matlab／Simulinksimulationshowsthattheproposedmethodcandistributeloadseffectivelyaccordingtothegeneratingcapacity．Duetothedistributedpowersupplyandloadallhavevariabilitycharacteristics，themismatchbetweenmicro—sourceandloadOCCurSfrequently．Modeledonthetraditionalmulti-levelfreque

7、ncycontrolmeans，acoordinatedcontrolstrategyforfrequencyinislandedmodeandthedetailedsimulationmodelwasproposed．Themainlyresearchesofthispaperarcasfollows：1)EstablishtypicalcontrolmodelofDGsandanalyzetheirpower—frequencycharacteristicsAccordingtodifferentinterfaceswit