弱电网阻抗对微电网运行特性影响的-研究

《弱电网阻抗对微电网运行特性影响的-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、哈尔滨工业大学工学硕士学位论文AbstractIncreasedpenetrationofthedistributedgenerationhighlightingthehighcostofstand-aloneaccessandcontrolhardissuesoftheirownexistenceandconnectingwiththegridonlyintheformofloadlimitstheabilityofdistributed’generationspowergenerationcapacity.Withthedevelopmentofpowe

2、relectronicinterfacetechnologyandmoderncontroltheory,theconceptofthemicrogridemerged.Microgridintegratestheadvantagesofdistributedgeneration,whileaddressingitsshortcomings.Microgridhastwomodesofoperation,islandingoperationmodeandconnectedgridoperationmode,thispaperistostudytheconne

3、ctedgridoperationmode.Inthispaper,MATLAB/SIMULINKsoftwareisusedtoestablishamicrogridmodelinconnectedgridoperationmodewiththephotovoltaiccellsassource.Atpresent,manysuchstudiesareconsideredthegridastheidealgrid，butintheweakgridconditions,themodelandstudyunderthisidealgridhavesomefla

4、ws.Basedonthemodelofmicrogridintheconnectedgridmodeundertheidealgrid,establishthemodelofmicrogridintheconnectedgridmodeundertheweakgridandanalysistheeffectofgridimpedanceontheoperatingcharacteristicsofthemicrogrid.Thekeyreasonforthestableoperationofmicrogridsystemisthereasonablecon

5、trolofgridconnectedinverter.InthispapertheinvertermodelisconstructedusingLCLfilter.Becausethecorestatusofinverterinmicrogridsystem,focusesontheanalysisoftheinfluenceofthegridimpedanceontheinverter,includingtheeffectsfortheresonantcharacteristicsoftheLCLfilterandtheeffectsforthedyna

6、micresponseandstabilityofthesystem.Becauseoftheexistenceofthegridimpedance,thenumberofparallelinverterwillalsoaffecttheperformanceofthemicrogridsystem.Theimpedanceofthepowergridhasgreatinfluenceonthemicrogridsystemoperatingcharacteristics,andsometimesmaycausesysteminstability,sowhe

7、nthegridimpedancechangesorthenumberoftheparallelgridconnectedinverterchanges,needtomodelingthesystemtoanalyzetheperformanceagain.Butfrequentanduncertaintyofthegridimpedancevariationmaketheworkhasagreatworkloadandveryhardtofinish.Thispaperintroducesastabilitycriterionbasedonimpedanc

8、ewhichcanbeusedtojudgethes