简介:<正>ChinaSouthernPowerGridisauniqueEHVAC/DChybridtransmissionnetworkthatoperatesinChina.Initsservicearea,thedistributionofenergyresourcesandthedevelopmentofeconomyareextremelyunbalanced,solong-distanceandbulkpowertransmissionareneeded;besides,thegeographyandclimateconditionsareserious,rains,fogs,lightningandtyphoonaswellashightemperaturearecommonalltheyearround.Facingthesechallenges,thepowergridenhancedstabilitycontrol,improvedtheequipmentandstrengthenthenetworkstructure.Inthefuture,thepowergridplanstooptimizethedispositionofpowersourcesandbuilddigitalizedpowersystem.
简介:WeproposeaBPNNbasedadaptiveslidingmodecontrolschemeforspeedtrackingofaDCmotorwithunknownsystemnonlinearities.Theinput-outputlinearizationtechniqueisusedtocancelthenonlinearities,andoutputoftheBPNNisincorporatedintothecontrollerintheproposedscheme.ItisshownthattherotorspeedofaDCmotorcanfollowanyarbitrarilyselectedtrajectoriesundervariableloadtorque.Thentheapplicationoftheapproachistestedviacomesimulations.
简介:我们报导当前的摆动anddc-voltage-controlled的详细理论研究在做的GaAs/AlAs反响的通道超点阵在下面的混乱动力学交叉电并且磁场。当超点阵在否定微分速度区域被偏导时,当前的自激振荡与合适的做的集中被观察。当前的摆动模式和摆动频率能被dc电压偏爱影响,做密度,并且磁性删除。什么时候交流电与固定振幅删除,频率也被用于系统,不同非线性的性质与dcvoltage的变化出现在外部电路偏爱。我们小心地与不同检测混乱的方法学习这些非线性的性质。
简介:Atypeofelectricaldischargecalledslidingdischargewasdevelopedtogenerateplasmaaerodynamicactuationforflowcontrol.Athree-electrodeplasmasheetactuatordrivenbyrepetitivenanosecondpulseswithanegativeDCcomponentwasusedtogenerateslidingdischarge,whichcanbecallednanosecond-pulseslidingdischarge.Thephenomenologyandbehaviouroftheplasmasheetactuatorwereinvestigatedexperimentally.Dischargemorphologyshowsthattheformationofnanosecond-pulseslidingdischargeisdependentonthepeakvalueoftherepetitivenanosecondpulsesandnegativeDCcomponentappliedontheplasmasheetactuator.Comparedtodielectricbarrierdischarge(DBD),theextensionofplasmainnanosecond-pulseslidingdischargeisquasi-diffusive,stable,longerandmoreintensive.TestresultsofparticleimagevelocimetrydemonstratethatthenegativeDCcomponentappliedtoathirdelectrodecouldsignificantlymodifythetopologyoftheflowinducedbynanosecond-pulseDBD.Bodyforceinducedbythenanosecond-pulseslidingdischargecanbeapproximatelyintheorderofmN.BoththemaximumvelocityandthebodyforceinducedbyslidingdischargeincreasesignificantlyascomparedtosingleDBD.Therefore,nanosecond-pulseslidingdischargeisapreferableplasmaaerodynamicactuationgenerationmode,whichisverypromisinginthefieldofaerodynamics.