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An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

IOP Conference Series: Materials science and Engineering 2018年第4期394卷

作者： Qifan Zeng Fei Xiao Sheng Ai Qiang Ren National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the dynamic relationship of MMC in a comprehensive way, and the harmonic characteristics of injection current are derived. Furthermore, the circulating current controller is modified according to the harmonics of injected current with changing frequency, which reduces the ripple of capacitor voltage effectively in a wide speed range. Simulation results are shown to demonstrate the effectiveness of the proposed method.

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Insulating materials for realising carbon neutrality:Opportunities,remaining issues and challenges

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High Voltage 2022年第4期7卷 610-632页

作者： Chuanyang Li Yang Yang Guoqiang Xu Yao Zhou Mengshuo Jia Shaolong Zhong Yu Gao Chanyeop Park Qiang Liu Yalin Wang Shakeel Akram Xiaoliang Zeng Yi Li Fangwei Liang Bin Cui Junpeng Fang Lingling Tang Yulin Zeng Xingtao Hu Jiachen Gao Giovanni Mazzanti Jinliang He Jianxiao Wang Davide Fabiani Gilbert Teyssedre Yang Cao Feipeng Wang Yunlong Zi The State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijingChina Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina Simpson Querrey Institute Northwestern UniversityEvanstonIllinoisUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA Department of Information Technology and Electrical Engineering ETH ZürichZürichSwitzerland School of Electrical and Information Engineering Tianjin UniversityTianjinChina Department of Electrical and Computer Engineering Mississippi State UniversityMississippi StateMississippiUSA Electrical and Electronic Engineering The University of ManchesterManchesterUK Department of Electrical Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghaiChina Key Laboratory of Control of Power Transmission and Conversion(SJTU) Ministry of EducationShanghaiChina College of Electrical Engineering Sichuan UniversityChengduChina Shenzhen Institute of Advanced Technology Chinese Academy of Sciences ShenzhenShenzhenChina School of Electrical Engineering Wuhan UniversityWuhanChina School of Integrated Circuits Tsinghua UniversityBeijingChina Jiangsu Jinxin Electric Appliance Co.Ltd. YangzhouChina Tai'an Tiancheng Safety Evaluation Co. Ltd.Tai'anChina Department Electrical Electronic and Information EngineeringUniversity of BolognaBolognaItaly National Engineering Laboratory for Big Data Analysis and Applications Peking UniversityBeijingChina Laplace Paul Sabatier Universityand CNRSToulouseFrance Electrical and Computer Engineering University of ConnecticutStorrsConnecticutUSA State Key Laboratory of Power Transmission Equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)GuangzhouChina De

The 2050 carbon-neutral vision spawns a novel energy structure revolution,and the construction of the future energy structure is based on equipment *** material,as the core of electrical power equipment and electrified transportation asset,faces unprecedented challenges and *** goal of carbon neutral and the urgent need for innovation in electric power equipment and electrification assets are first *** engineering challenges constrained by the insulation system in future electric power equipment/devices and electrified transportation assets are *** materials,including intelligent insulating material,high thermal conductivity insulating material,high energy storage density insulating material,extreme environment resistant insulating material,and environmental-friendly insulating material,are cat-egorised with their scientific issues,opportunities and challenges under the goal of carbon neutrality being *** the context of carbon neutrality,not only improves the understanding of the insulation problems from a macro level,that is,electrical power equipment and electrified transportation asset,but also offers opportunities,remaining issues and challenges from the insulating material *** is hoped that this paper en-visions the challenges regarding design and reliability of insulations in electrical equipment and electric vehicles in the context of policies towards carbon neutrality *** authors also hope that this paper can be helpful in future development and research of novel insulating materials,which promote the realisation of the carbon-neutral vision.

关键词： neutral insulation extreme

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Applications of MXenes in human-like sensors and actuators

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Nano Research 2023年第4期16卷 5767-5795页

作者： Jinbo Pang Songang Peng Chongyang Hou Xiao Wang Ting Wang Yu Cao Weijia Zhou Ding Sun Kai Wang Mark H.Rümmeli Gianaurelio Cuniberti Hong Liu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongUniversity of JinanJinan 250022China Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität DresdenDresden 01069Germany Center for Advancing Electronics Dresden Technische Universität DresdenDresden 01069Germany Dresden Center for Computational Materials Science Technische Universität DresdenDresden 01062Germany Dresden Center for Intelligent Materials(GCL DCIM) Technische Universität DresdenDresden 01062Germany High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Microelectronic Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353China School of Bioengineering Qilu University of TechnologyShandong Academy of ScienceJinan 250353China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Ministry of Education) Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Weihai Innovation Research InstituteQingdao UniversityQingdao 266000China School of Electrical and Computer Engineering Jilin Jianzhu UniversityChangchun 130118China Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden)20 Helmholtz StrasseDresden 01069Germany College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key L

Human beings perceive the world through the senses of sight,hearing,smell,taste,touch,space,and *** first five senses are prerequisites for people to *** sensing organs upload information to the nervous systems,including the brain,for interpreting the surrounding ***,the brain sends commands to muscles reflexively to react to stimuli,including light,gas,chemicals,sound,and ***,as an emerging two-dimensional material,has been intensively adopted in the applications of various sensors and *** this review,we update the sensors to mimic five primary senses and actuators for stimulating muscles,which employ MXene-based film,membrane,and composite with other functional ***,a brief introduction is delivered for the structure,properties,and synthesis methods of ***,we feed the readers the recent reports on the MXene-derived image sensors as artificial retinas,gas sensors,chemical biosensors,acoustic devices,and tactile sensors for electronic ***,the actuators of MXene-based composite are ***,future opportunities are given to MXene research based on the requirements of artificial intelligence and humanoid robot,which may induce prospects in accompanying healthcare and biomedical engineering applications.

关键词： MXenes sensors actuators gas sensors biosensors tactile sensors sound sensors artificial retina

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Research on control and operation support integrated system for nuclear power plants

Research on control and operation support integrated system ...

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International Conference on Computer, Mechatronics, Control and Electronic Engineering (CMCE)

作者： Chen Zhi Chen Deng-ke Zhang Yao Yu Ren National key laboratory of design technology of nuclear reactor system Nuclear Power Institute of China (NPIC) Chengdu China Department of nuclear power science and engineering Naval university of engineering Wuhan China

ISBN: (纸本)9781424479573

At present, the information and control system (I&C) and operation support system (OSS) of the nuclear power plants (NPPs) are designed separately; their structures and functions are independent. So, the compatibility, availability and dependability of them are not desirable, and the comprehensive advantages of them are not to exert fully. In order to resolve these problems, this paper presents a new idea that designing and developing the I&C and the OSS coordinately, so that their structures and functions are integrated. Firstly, this paper reviewed the evolution and application status of the OSS. And then, the realization methods and forms for the integrated system are analyzed. At last, the hierarchy and architecture of the integrated system which have the double-functions of the I&C and OSS is founded. Analysis and study is also carried out in terms of the hierarchy and characteristics of the integrated system.

关键词： Europe Instruments Reliability engineering Maintenance engineering

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High Frequency Modeling for Transformer Common Mode Noise Coupling Path Based on Multiconductor Transmission Line Theory

High Frequency Modeling for Transformer Common Mode Noise Co...

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Annual IEEE Applied power Electronics Conference and Exposition

作者： Peipei Meng Xiangming Zhang School of Automation Wuhan University of Technology Wuhan Hubei 430070 China National Key Laboratory of Science and Technology on Vessel Integrated Power System Technology Naval University of Engineering Wuhan Hubei 430033 China

ISBN: (纸本)9781467395519

Transformer is an important common mode (CM) noise coupling path in isolated power converters. But the EMI behavior of transformer is difficult to predict because of the complicated high frequency parasitics. This paper proposes a transformer Common-mode (CM) noise coupling path modeling approach based on multiconductor transmission line (MTL) theory. The MTL model can include the complicated magnetic and electrical couplings among the windings, the distribution of parasitic parameters, and the high frequency losses caused by skin and proximity effects. Physical structure oriented model is established in Maxwell 2D to extract the high frequency parasitic parameters of the transformer based on finite element method (FEM). With the MTL model the CM noise caused by the converter can be well predicted in the whole conducted EMI frequency range from 150 kHz to 30 MHz, which is validated by measured results with EMI receiver.

关键词： EMI/EMC common mode noise multiconductor transmission line theory finite element method transformer

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Analysis of the Axial Fan Performance Mounted on a 4.5kW Aviation Motor

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Journal of Physics: Conference Series 2021年第1期1820卷

作者： Bin Liu Zhongjun Yu Jia Fu Zutao Chen National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 China

Integrating an axial flow fan with the rotor is a sufficient cooling method for high-speed and high power density motors. Different from the axial fan design work under ideal intake condition, i.e. the intake flow of the fan is axial and uniform, the flow in actual engineering is more complex, which means the flow characteristics of an integrated fan are changed and disturbed. It leads to a performance penalty of the fan, and in some conditions it makes the fan stall, so it is important to get a knowledge of the flow characteristics and the performance of the integrated fan. A certain 4.5kW aviation motor with integrated axial fan is taken as the research object. Firstly, the motor-fan coupling simulation model and ideal axial intake simulation model are established, in which the mass flow rates are same, then calculation is conducted. Secondly, the simulation results are analyzed and compared, focusing on the performance of the axial fan, especially the static pressure rise, and the conclusion is obtained that the static pressure rise in ideal axial intake situation is higher than that in coupling situation. Furthermore, the reasons for the characteristics change are explored, finding that the increase of flow turbulence due to the more complex wind road structure is the main cause for these changes. This paper investigates the flow characteristics and axial fan performance mounted a whole motor, making a contribution to better understand the changes in fan performance under motor-fan coupling situation.

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Threshold Voltage Stability Enhancing technology for p-GaN HEMTs Using Hybrid Gate Structure

IEEE Electron Device Letters

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IEEE Electron Device Letters 2022年 1-1页

作者： Zhang, Chi Li, Mingfei Li, Sheng Liu, Siyang Wang, Denggui Lu, Weihao Ma, Yanfeng Liu, Mengli Wei, Jiaxing Zhang, Long Zhou, Jianjun Bai, Song Sun, Weifeng National ASIC System Engineering Research Centre Southeast University Nanjing China Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Devices Institute Nanjing China State Key Laboratory of Wide-Bandgap Semiconductor Power Electronic Devices Nanjing Electronic Devices Institute Nanjing China

A novel hybrid gate p-GaN power high-electron mobility transistor (Hyb-HEMT) technology is proposed in this work to effectively enhance threshold voltage (Vth) stability without significant gate leakage current (Igss) degradation. In this device concept, gate structure consists of spaced ohmic-type p-GaN metal dots and Schottky-type p-GaN metal. Charge storage effect can be alleviated through a free-carrier “discharge path” induced by ohmic-type p-GaN region, thus enhancing the Vth stability. The surrounding geometry distribution of Schottky-type p-GaN metal can take full advantage of depletion region, ensuring a relatively low Igss. It is experimentally demonstrated that hybrid gate structure can successfully suppress Vth shift within only 0.03V under 1200s DC drain/gate bias stress and the activation energy (EA) of proposed Hyb-HEMT is only 0.59eV, which indicates Hyb-HEMT owns shallower traps, leading to easier discharge of the induced stored charges. Meanwhile, experimental results and the mix-mode simulation prove that no carrier injection or trapping effect occurs in p-GaN layer after repetitive reverse freewheeling stress for the Hyb-HEMT device. IEEE

关键词： Threshold voltage

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Analysis of Variable Frequency Energy-Saving Operation of Beam Pumping Unit

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IOP Conference Series: Materials science and Engineering 2018年第4期452卷

作者： Jinping He Kai Ji Ming Xu Guozhu Mei Derong Lin Huanjing Xia National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan Institute of Marine Electric Propulsion Wuhan China

The frequency converter has been applied in the beam pumping unit, but the field application is still immature, and the energy saving effect is not ideal. This paper briefly analyzes the movement law of the beam pumping unit, and makes a proper simplification of the suspension point load. It derives the work done by the motor in one stroke of the steam head, and combines the oil recovery per unit time of the pumping unit. The operating law of the inverter when the ratio of motor energy consumption to oil production is the smallest. Finally, through simulation analysis, it is verified that the energy consumption of the slow and fast operation mode is lower than that of the constant speed operation mode.

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Indirect Vector Control for Stand-alone Operation Brushless Doubly Fed Induction Generator Employing power Winding Stator Flux Orientated Approach

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IOP Conference Series: Materials science and Engineering 2019年第4期612卷

作者： Kai Ji Wenfeng Long Jinping He National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan Institute of Marine Electric Propulsion Wuhan China

The brushless doubly-fed induction generator (BDFIG) provides an interesting alternative to the commonly applied conventional doubly-fed induction generator in wind turbines. In this paper, a novel voltage control strategy of stand-alone operation BDFIG for variable speed constant frequency wind energy conversion systems was presented. Based on the model of the generator, the power winding stator voltage and flux for stand-alone operation BDFIG are only determined by the equivalent PW stator magnetizing current which are independent of load, but PW stator terminal output power is only determined by load. An indirect PW stator flux orientated vector control scheme is employed to control the BDFIG by regulating the amplitude and frequency of the control winding stator current appropriately, and this results in constant generator terminal voltage and frequency for variations in both load and wind speed. In addition, simulation results prove the feasibility and validity of the proposed scheme, and excellent steady and dynamic state performance is achieved.

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Analysis of Eddy-Current Loss and its Reduction in a Conduction-Cooled HTS Magnet

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IOP Conference Series: Earth and Environmental science 2019年第4期300卷

作者： Kai Ji Wenfeng Long Jinping He Jun Zheng National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan Institute of Marine Electric Propulsion Wuhan China

Since conduction cooling system is environmental friendly and easy operating, the conduction-cooled method is widely used in cryogenic cooling system of high-temperature superconducting (HTS) magnet. The eddy-current losses are generated in the cooling structures when HTS magnet is charging and discharging or the current in the magnet is alternating. In this paper, a 3D model of analyzing the eddy-current loss was built. The eddy-current losses of a HTS magnet with different cooling structures were calculated. Thermal analysis of the HTS magnet was carried out together with the electromagnetic analysis. The effect of the cooling structures' geometric parameters on the eddy-current losses was discussed. The methods of reducing the eddy-current loss were proposed. The analysis results demonstrate that the optimization of the geometric parameters would greatly benefit the reduction of the eddy-current losses.

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