1 / 37
文档名称:

电力系统研究翻译.doc

格式:doc   大小:787KB   页数:37页
下载后只包含 1 个 DOC 格式的文档,没有任何的图纸或源代码,查看文件列表

如果您已付费下载过本站文档,您可以点这里二次下载

分享

预览

电力系统研究翻译.doc

上传人:1542605778 2023/3/13 文件大小:787 KB

下载得到文件列表

电力系统研究翻译.doc

文档介绍

文档介绍:该【电力系统研究翻译 】是由【1542605778】上传分享,文档一共【37】页,该文档可以免费在线阅读,需要了解更多关于【电力系统研究翻译 】的内容,可以使用淘豆网的站内搜索功能,选择自己适合的文档,以下文字是截取该文章内的部分文字,如需要获得完整电子版,请下载此文档到您的设备,方便您编辑和打印。ElectricPowerSystemsResearch
ExtendingthereactivecompensationrangeofadirectAC-ACFACTSdeviceforoffshoregrids
ABSTRACT
 TheauthorssuggesttousehybridmodulationschemestoimprovethereactivepowercompensationcapabilitiesofthedirectAC–,,thedirectAC–-Vector-.
Introduction
LargescaleintegrationofwindenergywillcallforthanincreaseduseofFlexibleACTransmissionSystems(FACTS).ForoffshoreACgrids,appropriateFACTSdeviceshouldpossessthetwofollowingfeatures:-ACFACTSdevicecomposedofamatrixconverterandapermanentmagnet(PM)synchronousmachine,,isbothcompactandreliablemainlybecausetheDClinkcapacitoris
Eliminated.
In[1,-ACFACTSdevicewaspresentedin[3,4],[1],
hybridmodulationschemespresentedin[5-8][8]theFACTSdevicesuggestedhereandin[4]isidentifiedasapossibleapplicationforthe
hybridmodulation.
ThereactivepowercompensationrangeoftheAC-(ISVM).InSection3thelimitationsthattheISVMcausesonthereactivepowercompensationrangeoftheFACTSdeviceareanalyzed
Thehybridmodulationcanbeusedtoextendthereactivepowercompensationatanylowoutputpowerfactorvalue,howeverforthesakeofbrevity,-Vector-Scheme(3VS)[9,10].Howeverthe3VSisinterestingasitisbased
,theresultsofthesimulationstudycarriedoutusingMatlabSimulinktocomparewiththeanalyticalfindings,.
-ACFACTSdevice
Asimpleper-phaseequivalentcircuitoftheFACTSdevice,,,thematrix
Phasor
Magnitude(peakvalue)
Magnitude(RMSvalue)
Input/outputvariableofthematrixconverter
Phaseangleofvariabley
Powerfactorangle
Voltagetransferratio
Currenttransferratio
Normalizedmodulationindex
Active/reactivepower
Switchingperiod
Dutyratio
Activeorzerovoltage/currentvectors
Voltage/currentspacevector
Angleofspacevector
Armatureresistance
Synchronousreactance
Excitationvoltage
;=V;LO,intotheoutputvoltage,Vi=
frompollutingthegrid,:
IntheparticularcaseofnoloadontherotorshaftofthePMmachine,noactivepoweristransferredthroughthematrixconverter,theoutputpowerfactorzero,correspondingtotheFACTS
deviceprovidingpurereactivepowercompensation.


TheconventionalISVMconsidersthematrixconvertertobeoftheindirectfarm,see
(VSI)spacevectormodulationandCurrentSourceRectifier(CSR)spacevectormodulation,,,.(3)and(4)areusedforcalculatingthedutyratiosdrsanddrtcorrespondingtothecaseoftheinputcurrentspacevectori;.}plyinginthesectorformedbytheactivevectorsi,,},representedrespectivelybythefirstandsecondletterinthesubscript.
Similarlywhentheoutputvoltagespacevectorvo..spislyinginthesectorformedbytheactivevectorsu},anduputhedutyratiosare
calculatedasinEqs.(5)and(6).(p)orlower(n)switchisON.
.(8),thefollowingexpressionoftheDClinkcurrentcanbefound:
ItisclearfromEq.(11).(9)inEq.(11)themaximumcurrenttransferratioisobtainedas'

Thereactivepowerattheinputofthematrixconverterdepends
ontheactivepoweraccordingtoEq.(13):
Toobtainamoreinsightfulexpressionfortheinputreactivepower,:
Aftersimplifications,equationsfortheactiveandreactivepowersarefoundthatdependonlyoncircuitparameters:Theinput