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ID:27511963
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页数:3页
时间:2018-12-04
《2011科技英语阅读与写作考卷》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第1页共3页西安理工大学研究生试卷考试科目科技英语阅读与写作(电气工程)命题教师审题教师考试时间2011年4月2日19时30分——21时30分考试方式开卷学号姓名成绩注意:第一、二大题的答案请写在每个单词的右侧。一、请写出以下词汇的词性及其电气工程专业术语词意(40×1分)(名词可用n.表示,动词可用v.,形容词可用a.)transformerloadclosed-loopleakagestrayequivalentshaftimpedancemagnitudepowerfactorinsulationsensorphotovoltaictwo-stagetopologyalgorithm
2、parameteraccuracyreactivepoweridentificationchipbipolarcapacitorphaseripplesynchronoussimulationmodulationratingtransientgatedrivediodefilterrectifierdcbuswaveformoscilloscopestrategyfeedbackpowerdevice注:1.命题纸上一般不留答题位置。字、图清楚,请勿超出边框,以便复印。2.考试试题及试卷由任课教师保管三年后才能销毁。第2页共3页二、请写出以下英文缩写的英文全称及汉语意思(5×2分)MPPT
3、UPSPFCTHDESR三、科技论文摘要英译中(2×17分)1)M.Mohseni,S.M.Islam,andM.A.S.Masoum,“EnhancedHysteresis-BasedCurrentRegulatorsinVectorControlofDFIGWindTurbines,”IEEETrans.PowerElectron.,vol.26,no.1,pp.223–234,Jan2011Abstract—Thispaperproposesenhancedhysteresis-basedcurrentregulatorsinthefield-orientedvectorcontro
4、lofdoublyfedinductiongenerator(DFIG)windturbines.Theproposedcontrolschemeissynchronizedwiththevirtualgrid-fluxspacevector,readilyextractablebyaquadraturephase-lockedloop(QPLL)system.Identicalequidistant-bandvector-basedhysteresiscurrentregulators(VBHCRs)arethenusedtocontroltheoutputcurrentsofthero
5、tor-sideandgrid-sideconverters.Theproposedhysteresis-basedtechniquehasexcellentsteady-stateperformanceandrevealsseveraladvantagesincomparisonwiththecommonlyusedproportional-integral(PI)currentregulator,includingveryfasttransientresponse,simplecontrolstructure,andintrinsicrobustnesstothemachinepara
6、metersvariations.Moreover,thefixedhysteresisbandsinVBHCRsarereplacedwithequidistantbandstolimittheinstantaneousvariationsoftheswitchingfrequencyandreducethemaximumswitchingfrequenciesexperiencedintheconverters.Extensivesimulationstudiesarecarriedoutfora1.5MWDFIG-basedwindturbinetoexaminetheoperati
7、onoftheproposedvectorcontrolschemeunderchangingwindspeedandcompareitstransientandsteady-stateperformanceswiththeconventionalPIcurrentregulators.IndexTerms—Doublyfedinductiongenerator(DFIG),equidistanthysteresisba
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