简介:Thewindenergygeneration,utilizationanditsgridpenetrationinelectricalgridareincreasingworld-wide.Thewindgeneratedpowerisalwaysfluctuatingduetoitstimevaryingnatureandcausingstabilityproblem.Thisweakinterconnectionofwindgeneratingsourceintheelectricalnetworkaffectsthepowerqualityandreliability.Thelocalizedenergystoragesshallcompensatethefluctuatingpowerandsupporttostrengthenthewindgeneratorinthepowersystem.Inthispaper,itisproposedtocontrolthevoltagesourceinverter(VSI)incurrentcontrolmodewithenergystorage,thatis,batteriesacrossthedcbus.Thegeneratedwindpowercanbeextractedundervaryingwindspeedandstoredinthebatteries.Thisenergystoragemaintainsthestiffvoltageacrossthedcbusofthevoltagesourceinverter.Theproposedschemeenhancesthestabilityandreliabilityofthepowersystemandmaintainsunitypowerfactor.Itcanalsobeoperatedinstand-alonemodeinthepowersystem.Thepowerexchangeacrossthewindgenerationandtheloadunderdynamicsituationisfeasiblewhilemaintainingthepowerqualitynormsatthecommonpointofcoupling.Itstrengthenstheweakgridinthepowersystem.Thiscontrolstrategyisevaluatedonthetestsystemunderdynamicconditionbyusingsimulation.Theresultsareverifiedbycomparingtheperformanceofcontrollers.
简介:Theresonancesofparametricvibrationwithforcedvibrationisanalyzed,thebifurca-tionequationofthesystemisobtainedandthesinsularityanalysisismade.Someofthelawsandphe-nomenaarerevealed.Thetransitionvarietyandbifurcationdiagramofthephysicalparametricplanearegiven.Theresultscanbeusedinensinecrins.
简介:Allkindsofreasonsareanalysedintheoryandafaultrepositorycombinedwithlocalexpertexperiencesisestablishedaccordingtothestructureandtheoperationcharacteristicofsteamgeneratorinthispaper.Atthesametime,Kohonenalgo-rithmisusedforfaultdiagnosessystembasedonfuzzyneuralnetworks.Fuzzyarithmeticisinductedintoneuralnetworkstosolveuncertaindiagnosisinducedbyuncertainknowledge.Accordingtoitsself-associationinthecourseofdefaultdiagnosis.thesystemisprovidedwithnon-supervise,self-organizing,self-learning,andhasstrongclusterabilityandfastclustervelocity.
简介:一个exhaust热恢复生成器被建议与使周期凉下来改进系统精力效率的常规烧瓦斯的三倍效果的LiBr/water吸收综合。作为案例研究,新奇周期的模拟在从0~3.5%的各种各样的热恢复发电机蒸汽生产比率下面基于有使1150kW的能力凉下来的有希望的平行流动被执行。节省经济分析,年度煤气的保存与箱方法为被估计的生命周期,被采用证明额外的开销的有价值。结果证明保存收入的最佳气体与42kW在2.8%热恢复生成器蒸汽生产比率被获得用尽恢复的热,和系统精力效率从1.78~1.83被改进。exchanger的起始的投资能在7年和煤气的节省的9000CNY以内被归还收入将在机器的15年的生命周期上被完成。这种技术能容易被实现并且介绍理想的经济效果,它对三倍效果的吸收周期的发展可行。
简介:Intheprocessofdevelopingandadjustingtheproductinthisproject,weneedsomesignalsources,whichusuallyaffordsquareorsinewave.Generallythesquarewareisusedfordigitlogic,butfortheanalogsignalwaveisusedtojudgethelinearity'squalitiesandotherfunctionsoftheelectriccircuit.Howeverthecommonready-madesignalsourceisallunidirectionalsinewave,thesignalsourceswhosephaseshiftcanarbitrarilyberegulatedandwhichhaveprecisephasearestillnotavailableonethecurrentmarket.
简介:IMPCSRRFGroupcooperatingwithBINPhasfulfilledthefollowingprojects.PCIbasedRFsignalgenerator;PLDcenteredRFstationinterlockandsurveillanceunit;Highfrequencyanalogsignalprocessingunits;CVIandWindowsplatformbasedmonitorandoperationinterface.
简介:在一个thermoacoustic声波发电机的摆动的流动被描述。thermoacoustic声波发电机在thermoacoustic设备起一个重要作用。在工作液体的工作液体和栈,加速和减速之间的热交换并且粘滞在栈并且在回声试管影响的磨擦损失thermoacoustic声波生成器的性能。特别地,摆动的流动显著地影响在工作液体和栈之间的热交换机制。在压力和速度的时间的变化是在回声试管内的正弦曲线。流动就在试管插头后面形成一口摆动的喷气,并且在回声试管外面下游地远变得断断续续。0.63R的无限制的修正,也就是说尽管有在试管插头外面,被速度大小证实并且流动,摆动的流动特征下游地被维持的区域可视化。另外,他们几乎等于听觉的理论结果。关键词thermoacoustic现象-声波生成器-摆动的流动CLC数字TK11.4
简介:AGENERATORANDASIMPLEXSOLVERFORNETWORKPIECEWISELINEARPROGRAMSSUNJIE(孙捷)(InstituteofAppliedMathemematics,theChineseAcademyofSci...
简介:这份报纸论述方法由压电的生成器从沥青人行道收获机械精力。结果证明在沥青人行道的势能能每公里每小巷直到150kW/h。机械精力的部分能被压电的变换器收获。七个典型变换器的表演通过有限元素分析被检验。PZT堆的结果表演并且多层,在沥青人行道环境的钗钹和桥罐头工作。PZT堆积并且多层更高让精力变换评价。然而,如果这些变换器在人行道直接被嵌入,全部的收获精力是小的。一个原型人行道发电机用PZT堆积被开发增加收获精力。发电机能在交通拥挤下面从人行道收获超过50kW/h精力。816PZT堆积为一个发电机被推荐。圆形状被建议让PZT堆积减少应力的集中。并且多层的结构被推荐因为PZT堆发电机的电的潜力到减少。生成器能在沥青人行道作为传感器被扩大,它能被用来监视交通,人行道压力和温度。
简介:Graphitedusthasanimportanteffectonthesafetyofhigh-temperaturegas-cooledreactors(HTR).Theflowfieldinthesteamgeneratorwasstudiedbythecomputationalfluiddynamics(CFD)method,withtheresultsindicatingthatthefrictionvelocityinthewindwardandtheleewardoftheheattransfertubesisrelativelylowandishigheratthesides.Furtheranalysisoftheresuspensionofgraphitedustindicatesthattheresuspensionfractionreachesnearlyzeroforparticleswithadiameterlessthan1μm,whereasitwillincreasesastheheliumvelocityinthesteamgeneratorincreasesforparticlesizelargerthan1μm.Moreover,theresuspensionfractionincreasesastheparticlesizeincreases.Theresultsalsoindicatethatresuspensionoftheparticleswithsizeslargerthan1μmexhibitedobviousdifferencesindifferentpartsofthesteamgenerator.
简介:Fromthebeginningof1970’s,theresearchworkonstrandcurrentdistributioninhydro-generatorstatorbarshasbeenmademarkedprogressinChina.Inordertoknowwhythegeneratorbarinsulationswerebrokendownsooftenbothinop-erationandintestingafterthegeneratorsbeingputintooperationfor8-10yearsatXinanjiangHydropowerStation.Investigationswereconductedandtheresultsoffieldmeasurementshowedthatthe
简介:Longseriesofdailyweatherdataarefrequentlyneededtoevaluatediachronicclimaticimpactonwaterresources,theeffectsofwatershedchangesonhydrologyandtouseinavarietyofweatherandgeneralcirculationmodels.AcomputergenerationmodelcalledWGENthatwasdevelopedintheUnitedStatesofAmerica,wasmodifiedinthisstudyandappliedtoNigerianweatherdataspanningtheperiodbetween1969to1988andcovering17siteslocatedinthedifferentclimaticzonesinNigeria.Themodelgeneratedthemonthlymeanmaximumandminimumtemperatures,solarradiation,totalrainfall,andnumberofwetanddrydayswithhighaccuracy,95%ofthetimes.TheMann-WhitneyU-testrevealedthatthenumberofmonthsperyearforwhichobservedandgeneratedweathervariablesweresignificant,waslessthan4inmajorityofthesites.