电气工程及其自动化专业英语 课件 -Chapter 9 Wide Area Measurement Protection System

目录Introduction9.1PhasorMeasurementUnit(PMU)andItsApplication9.2Wide-AreaProtectionSystem9.3Chapter9WideAreaMeasurementProtectionSystemphaser['feizə]n.移相器；相位器merit['merit].优点，价值nominal['nɔminəl]adj.名义上的；近似的aliasing['eiliəsiŋ]n.混淆现象；折叠失真recursive[ri'kə:siv]adj.递归的；循环leased[li:st]adj.租用的coarse[kɔ:s]adj.粗略的；粗糙的；粗俗的；下等的navigational[,nævi'geiʃənəl]adj.导航；航行的，航运的furnish['fə:niʃ]vt.提供；供应；装备antenna[æn'tenə]n.天线；触角Selectionisbasedsolelyon().meritdefectharmreputationABCD提交单选题1分algorithm['ælɡəriðəm]n.算法，运算法则rotate[rəu'teit,'rəut-,'rəuteit]vi.旋转；循环velocity[vi'lɔsəti]n.速率；迅速；周转率prevailing[pri'veiliŋ,pri:-]adj.一般的，最普通的；盛行很广的；占优势的；流行的iterative['itərətiv,-reit-]adj.迭代的；重复的，反复的

skew[skju:]n.斜交；歪斜adj.斜交的；歪斜的validate['vælideit]vt.确认；使生效；证实matrix['meitriks]n.矩阵；模型dimensionality[di,menʃə'næləti,dai-]n.维度；幅员trajectory['trædʒiktəri,trə'dʒek-]n.轨道，轨线；弹道Soweareburningupanenormousamountoffuelateverylaunchjusttogettherocketuptowhat'sknownasescape().lengthvolumevelocityqualityABCD提交单选题1分Analysingtheconsequencesofanypolicymustincorporatehowbadluckmay()theoutcome.favorableskewcorrectivevirtuousABCD提交单选题1分derivatives[di'rivətivz]n.派生物；引出物；派生词sabotage['sæbətɑ:ʒ,,sæbə'tɑ:ʒ]n.蓄意破坏；破坏活动shed[ʃed]vt.流出；摆脱；散发spectrum['spektrəm]n.光谱；频谱fingertip['fiŋɡətip]n.指尖；指套robust[rəu'bʌst,'rəubʌst]adj.强健的；健康的；粗野的turnkey['tə:nki:]n.成套系统；狱吏Heaccusedtheoppositionofdoingeverythingtheycouldto()theelection.supportpromoteexpeditesabotageABCD提交单选题1分Hewasalwaysthe()one,physicallystrongandmentallysharp.approachableunsounduncourteousrobustABCD提交单选题1分此题未设置答案，请点击右侧设置按钮目录Introduction9.1PhasorMeasurementUnit(PMU)andItsApplication9.2Wide-AreaProtectionSystem9.31Forexample,whenthepowersystemisundergoingelectromechanicaloscillationsduringpowerswings,thewaveformsofvoltagesandcurrentsarenotinsteadystate,andneitheristhefrequencyofthepowersystematitsnominalvalue.例如，当电力系统在功率摇摆时发生机电振荡，电压和电流的波形不是稳定状态，并且电力系统的频率也不是正常值。目录9.Introduction9.19PhasorMeasurementUnit(PMU)andItsApplication9.29Wide-AreaProtectionSystem9.32Itshouldbenotedthatthewaveformissampledbythemeasurementsystemcontinuously,andeachtimeanewsampleisacquired,anewphasorisobtainedwithadatawindowincludingthelatestsample.应该指出，由测量系统连续采样得到波形，每当得到一个新的采样值，就可以从包含这个最新采样值的数据窗得到一个新的相位。3Whenseveralvoltagesandcurrentsinapowersystemaremeasuredandconvertedtophasorsinthisfashion,theyareonacommonreferenceiftheyaresampledatpreciselythesameinstant.当以这种方式对电力系统中的电压和电流进行测量及相位转换时，如果他们正好在同一时刻采样，那么它们就具有共同参考向量。4Fiberopticlinks,whereavailable,couldbeusedtoprovidehighprecisionsynchronizationsignals,ifadedicatedfiberisavailableforthispurpose.光缆线路，可以的话，能用来提供高精度的同步信号。如果有专用光纤就能达到这个目的。5Themicroprocessordeterminesthepositivesequencephasorsaccordingtotherecursivealgorithmdescribedpreviously,andthetimingmessagefromtheGPS,alongwiththesamplenumberatthebeginningofawindow,isassignedtothephasorasitsidentifyingtag.微处理器根据前面所述的递归算法决定正序相位，并把GPS发出的时间信息和从一个时间窗口开始的采样次数赋给相位作为识别标记。6Thestate(vector)isacollectionofallthepositivesequencevoltagephasorsofthenetwork,and,fromthetimethefirstmeasurementistakentothetimewhenthestateestimateisavailable,severalsecondsorminutesmayhaveelapsed.状态（矢量）是一个网络的所有正序电压相量的集合，从第一次测量到能进行状态估计时，几秒钟或几分钟可能已经过去了。7Oneofthemostobviousapplicationsoftheinstabilitypredictiontechniqueistoprovideanimprovedadaptiveout-of-stepprotectionfunction,whichadaptstochangingpowersystemconditions.不稳定预测技术最明显的的应用之一是提供一种改进的自适应失步保护功能，这与不断变化的电力系统状况相适应。

8MaximumbenefitfromavailablehardwarethathavepasseddifferentkindsofEMCandenvironmentaltests,aswellassoftwarefunctionsavailablefromotherprotectionterminals,hastobemade.（我们）可以从通过了各种电磁兼容和环境测试的硬件及安装在其他保护终端上的软件上获得最大的效益。目录Introduction9.1PhasorMeasurementUnit(PMU)andItsApplication9.2Wide-AreaProtectionSystem9.39Ifthecommunicationispartiallyortotallylost,actionscanstillbetakenbasedonlocalcriteria.Differentloadsheddingstepsthattakethepowersystemresponseintoaccount,inordernottoovershed,caneasilybedesigned.如果通讯部分或完全丧失，仍可根据局部标准进行操作。为了不至于过度切负荷，考虑到电力系统的响应可以容易地设计不同的甩负荷步骤。10Themeaningofwide-areap