2011科技英语阅读与写作考卷

《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