含微网的配电系统电压暂降和三相不平衡-分析和控制

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

2、ionofmicrogridsutilizingrenewableenergyandtraditionallargepowergridisbecomingthenewtrendintheworld．Withthestudyandapplicationofmicrogridstechnology,powerqualityofdistributionsystemwithmicrogridsisgettingmoreandmoreattention．Theresearchonnewcompensationmeasuresandcontrolstrategytoim

3、provethepowerqualityofmicrogridisofgreatsignificance．Basedonstudyonstructure，operation，mainsourcetypesandcontrolstrategiesofmicrogrids，thisarticleestablishesthemodelofdistributionsystemwithmicrogrids，analyzesitspowerquality,theappearanceofthree-phasevoltagesagsandimbalanceinthissys

4、tem．Forvoltagesagproblem，morphologyfilterwhichcanimproveitsdetectionalgorithmandtopologystructuresharingDCbuswithmicrosourcesareputforward，combinedwithutilizationofdynamicvoltagerestorerintraditionalgrids．Forthree—phaseimbalanceproblem，itisanalyzedthatmathematicsmodelandtheoutputch

5、aracteristicsofgridsideconverterinimbalanceconditions．Andthentheimprovementmeasureoffeedforwardnegative-sequencecontrolisproposed，whichisbasedonthetraditionalPQcontrolstrategy．ThemodelsbasedonPSCAD／EMTDContheseresearchapproachesareestablishedanditisstudiedthatthecontroleffectsonpow

6、erqualitywhenvoltagesagsandimbalanceoccurred．Thesimulationresultsshowthattheseimprovementmeasurementscanbeappliedinmicrogridssystem．microgridscanbeutilizedfullywhenguaranteeingitsnormalrunning，andalsothepowerqualityofdistributionsystemwithmicrogridscanbeimprovedeffectively．Keywords

7、：Microgrids，powerquality，dynamicvoltagerestorer，feedforwardnegative-sequencecontrol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⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、21．2．1微网的研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯