含微网的配电系统电压暂降和三相不平衡分析与控制

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1、华北IU力人学硕：f：学位论文AbstractStrongandreliableelectricpowergridistheimportantpillarforthedevelopmentofthenationaleconomy．Withthedevelopmentofpowergrid，thelimitationoflarge-scaleandcentralizedpowersupplyrevealsprogressively；andalsobecauseoftheglobalresourcese

2、xhaustion，theextensivecombinationofmicrogridsutilizingrenewableenergyandtraditionallargepowergridisbecomingthenewtrendintheworld．Withthestudyandapplicationofmicrogridstechnology,powerqualityofdistributionsystemwithmicrogridsisgettingmoreandmoreattentio

3、n．Theresearchonnewcompensationmeasuresandcontrolstrategytoimprovethepowerqualityofmicrogridisofgreatsignificance．Basedonstudyonstructure，operation，mainsourcetypesandcontrolstrategiesofmicrogrids，thisarticleestablishesthemodelofdistributionsystemwithmic

4、rogrids，analyzesitspowerquality,theappearanceofthree-phasevoltagesagsandimbalanceinthissystem．Forvoltagesagproblem，morphologyfilterwhichcanimproveitsdetectionalgorithmandtopologystructuresharingDCbuswithmicrosourcesareputforward，combinedwithutilization

5、ofdynamicvoltagerestorerintraditionalgrids．Forthree—phaseimbalanceproblem，itisanalyzedthatmathematicsmodelandtheoutputcharacteristicsofgridsideconverterinimbalanceconditions．Andthentheimprovementmeasureoffeedforwardnegative-sequencecontrolisproposed，wh

6、ichisbasedonthetraditionalPQcontrolstrategy．ThemodelsbasedonPSCAD／EMTDContheseresearchapproachesareestablishedanditisstudiedthatthecontroleffectsonpowerqualitywhenvoltagesagsandimbalanceoccurred．Thesimulationresultsshowthattheseimprovementmeasurementsc

7、anbeappliedinmicrogridssystem．microgridscanbeutilizedfullywhenguaranteeingitsnormalrunning，andalsothepowerqualityofdistributionsystemwithmicrogridscanbeimprovedeffectively．Keywords：Microgrids，powerquality，dynamicvoltagerestorer，feedforwardnegative-sequ

8、encecontrol华北电力火学硕Ij学位论文目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstraet⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．II第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．11．1课题背景及研究的目的和意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．2．1微网的研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯