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Converter-Based Reconfigurable Real-Time Electrical System Emulation Platform

Chinese Journal of Electrical Engineering 2018年第1期4卷 20-27页

作者： Yiwei Ma Jingxin Wang Fred Wang Leon M.Tolbert curent The University of TennesseeKnoxvilleTN 37996USA Oak Ridge National Laboratory Oak RidgeTN 37831USA

A Hardware Testbed(HTB)is developed for accurate and flexible emulation and testing of electrical power system and their control,measurement,and protection *** the HTB,modular and programmable power electronics converters are used to mimic the static and dynamic characteristics of electrical power *** paper overviews the development,integration,and application of the HTB,covering emulation principle,hardware and software configuration,and example results of power system research using the *** advantages of the HTB,compared with real-time digital simulation and downscaled hardware-based testing platform are discussed.

关键词： Emulation modeling real-time simulation

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Regional-scale relationship among biological soil crusts,invasive annual grasses,and disturbance

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Ecological Processes 2013年第1期2卷 18-25页

作者： Eric B Peterson Nevada Natural Hertage Program State of NevadaCarson CityNV 89701USA curent Address Trinity River Restoration Program US Bureau of ReclamationWeavervilleCA 96093USA

Introduction:Sagebrush ecosystems in western North America are being replaced by the invasion of annual grasses,particularly Bromus *** experimental situations and in localized landscapes,prior studies have documented that biological soil crusts(biocrusts)can reduce annual grass presence and that biocrusts are highly vulnerable to physical *** conservation would benefit from verification of these patterms at scales that matter to local *** study tests if these patterns appear at a regional ***:A previously collected data set of vegetation provided sampling of biocrust cover across the Great Basin within the state of Nevada,USA Data were analyzed with non-par ametric methods including odds ratios and generalized aditive models(GAM).Results:From a data set of 608 vegetation plots within the Great Basin ecoregion,proportion of plots with high annual grass cover differed between sites with high versus low biocrust cover(p=0.0015).A negative relationship between annual grass cover and biocrust cover was confirmed with GAM(p=0.009).For a model of biocrust cover,cattle disturbance was found to be an explanatory variable(p<0.00001).Conclusions:The patterns do appear at the regional scale,with high levels of cattle activity corresponding to low cover of biocrusts,and low cover of biocrusts corresponding to high cover of annual grasses.

关键词： Biological soil crusts Cryptogamic crust Microphytic crust Great basin ecoregion Sagebrush ecosystem Landscape ecology Disturbance Cattle grazing Odds ratio Generalized additive models

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Overview of High Voltage SiC Power Semiconductor Devices: Development and Application

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CES Transactions on Electrical Machines and Systems 2017年第3期1卷 254-264页

作者： Shiqi Ji Zheyu Zhang Fred(Fei)Wang curent&the Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN 37996-2250 USA

Research on high voltage(HV)silicon carbide(SiC)power semiconductor devices has attracted much attention in recent *** paper overviews the development and status of HV SiC ***,benefits of HV SiC devices are *** technologies and challenges for HV SiC device application in converter design are *** state-of-the-art applications of HV SiC devices are also reviewed.

关键词： High voltage SiC power semiconductor devices SiC-based converter

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