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49th EPS Conference on Plasma Physics, EPS 2023

作者： Fang, J.G. Chen, Z.Y. Yan, W. Wang, N.C. Xia, D.H. Ding, Y.H. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

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Settings Optimization Method for Zero-Sequence Directional Overcurrent Relays Based on Coordination Time Interval 37th

Settings Optimization Method for Zero-Sequence Directional O...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Gao, Yukun Gao, Yi Chen, Jinfu Shi, Hengchu Kong, Dezhi Chen, Jing You, Hao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Yunnan Power Dispatching and Control Center Kunming650011 China

ISBN: (纸本)9789819914388

Zero-sequence directional overcurrent relays (DOCRs) are generally configured with unified settings in China extra-high voltage (EHV) power grid practice, which will inevitably lead to poor rapidity of the whole protection system while ensuring the selectivity requirement. In this paper, a settings optimization method for the zero-sequence DOCRs based on the coordination time interval (CTI) is proposed. Firstly, the relationship between the CTI and the inverse-time characteristic is analyzed. Then, based on the principle that all the zero-sequence DOCRs are configured with unified settings, the determined settings of each relay are optimized according to the sequence of the CTI from small to large. The proposed method is applied to a 500 kV regional power grid, and the result shows that the method can improve the rapidity of the whole protection system and simplify the zero-sequence DOCR coordination process simultaneously. © 2023, state Grid Electric Power.

关键词： Relay protection

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Optimized Design and Analysis of Clip Bonding Packaging for Avalanche Bipolar Junction Transistor 2

Optimized Design and Analysis of Clip Bonding Packaging for ...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Xu, Mosai Liang, Lin Yan, Xiaoxue School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Engineering Research Center of Power Safety and Efficiency Ministry of Education Wuhan China

ISBN: (纸本)9798350313765

To meet the increasing demand for high switch speed of avalanche bipolar junction transistors (ABJT) and to solve the heat dissipation problem of the commonly used SOT23 packaging, an optimized packaging design for ABJT using the clip bonding is proposed. In this paper, a series of analysis is conducted based on finite element simulation to study the thermomechanical performance of the novel clip bonding packaging. A comparison of the parasitic parameters, thermal and mechanical properties between clip bonding and wire bonding packaging demonstrates that the bigger bonding area leads to lower inductances and thermal resistance, as well as better heat dissipation performance and reliability. The thickness of the copper sheet is also optimized and the reliability analysis is conducted using the Hallberg-Peck model, demonstrating that the reliability of the clip bonding packaging is superior to the conventional SOT23 packaging using wire bonding. © 2023 IEEE.

关键词： avalanche bipolar junction transistors clip bonding finite element analysis thermal resistance

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Calculations of Deposition Layer Remelting Using Stefan Condition Method in Rail Launcher 18th

Calculations of Deposition Layer Remelting Using Stefan Cond...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Yang, Hongdan Li, Chengxian Xu, Jinghan Xia, Shengguo Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China College of Electrical Engineering Naval University of Engineering Hubei Wuhan430033 China

ISBN: (纸本)9789819713509

During the process of electromagnetic launch, there is a mega-ampere pulse current at the armature/rail(A/R) interface, and the relative sliding speed is hundreds of meters per second. Therefore, a large amount of Joule heat and friction heat at the A/R interface will be generated to melt and wear the armature, then the molten aluminum will be solidified and deposited on the surface of the rail and form a deposition layer. At the same time, the interfacial deposition layer will also be distributed with a huge amount of heat, even lead to remelting. In this paper, based on the Stefan condition method, a calculation model of the remelting characteristics of the deposition layer is established, which is used to analyze the remelting characteristics of the deposition layer of the large-caliber armature in the full current stage. Additionally, the effects of the linear current density, contact resistance and velocity of the armature on the remelting thickness of the deposition layer are analyzed. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Remelting

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A Fast Line Reclosing Strategy for Power System Under DG Access 4

A Fast Line Reclosing Strategy for Power System Under DG Acc...

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4th International Conference on Power engineering, ICPE 2023

作者： Pan, Wulue Xu, Feng Zhang, Zanzan Ma, Ruizhi Qian, Zhengxu Qiu, Yutao Chen, Shuiyao Fang, Yudong State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350340020

For the automatic reclosing of power system under renewable energy source access, the current practice is usually to cut off the renewable energy source or block the reclosing gate after a fault occurs. This will lead to the shutdown of the renewable energy source and the interruption of power supply to a large number of local loads, which is not conducive to the safe operation of the grid and the efficient utilization of the renewable energy source. In this paper, a fast reclosing method is proposed for substation lines with inverter-type renewable energy source access, which can ensure the power supply of important loads and make the renewable energy source stable during the reclosing period without going off-grid. Firstly, it is pointed out that the inverter-type renewable energy source is switched to VSG-control during the reclosing period, so that it has the basic islanding operation capability. Then the method of load shedding with the startup of unloading resistor during the reclosing period is proposed to ensure the power balance between the new energy power and the loads. Next, adjusting the rated frequency of the renewable energy source to accelerate the simultaneous process, which can speed up the whole reclosing process. Finally, the simulations under different working conditions are carried out on the PSCAD/EMTDC to verify the feasibility of the proposed reclosing strategy. © 2023 IEEE.

关键词： Electric load shedding

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A Simulation Platform for Assessing the Status of the Vibration Sensor Hanging the Grid 17th

A Simulation Platform for Assessing the Status of the Vibrat...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Lei, Yaowu Liu, Jing Hu, Haoliang Chen, Dezhi Zhou, Feng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9789819904501

Vibration will lead to power grid disconnection, equipment rupture and other problems, so the working status of the vibration sensor hanging the grid is closely related to the normal operation of the power grid. But there are few researches on the status evaluation of the vibration sensor. On this basis, this paper selects spring-mass-damping system to simulate the sensor, and the classical mechanics is used to deduce the differential equation of the sensor under the system. By the equation, the corresponding transfer function can be established and replaces the sensor to simulate the actual sensor’s work in Simulink, which can provide the sensor work data used for algorithm validation. In addition, the platform simulation interactive interface with the Simulink is established by the APP Designer. In the test section, wavelet is selected for the pre-analysis, and the test is further completed by the BP neural network and Support Vector Regres sion. The simulation platform built can simulate the common status faults of the vibration sensor, and evaluate the status in the platform to test the effectiveness of the status evaluation algorithm. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Simulation platform

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Investigation of edge plasma cooling approaching the density limit in limiter and divertor configurations on J-TEXT 49

Investigation of edge plasma cooling approaching the density...

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49th EPS Conference on Plasma Physics, EPS 2023

作者： Xu, X. Chen, Z.P. Yang, Q.H. Wang, J.M. Guo, J.L. Wang, Y.H. Gao, L. Zhang, X.Q. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781713898672

This paper investigates the characteristics of edge plasma parameters closed to the density limit, specifically in the LCFS and q=3 surface, in different magnetic configurations (normal limiter, HFS-limiter, and HFS-MSN divertor) with varying carbon impurity concentrations on J-TEXT. The edge electron temperature and density in the vicinity of LCFS exhibit differences in the three magnetic field configurations. However, the C III radiation contraction indicates that the electron temperature near the q =3 surface converge to a similar level approaching DL. The edge cooling at the q=3 surface may play a crucial role in triggering the disruption of the density limit on J-TEXT. © 2023 49th EPS Conference on Plasma Physics, EPS 2023. All rights reserved.

关键词： Electron temperature

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An electron beam irradiation-assisted coating method for the regulation of hydrophilicity and hydrophobicity

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2024年第3期2卷 458-468页

作者： Haozhe Li keyan Sheng Zhiyan Chen Shuai Hao Zijian Zhou Zhenyi Zhang Xinwen Liu Mianzhi Xiong Yanlong Gu Jiang Huang State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074HubeiPR China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPR China Huadian Electric Power Research Institute Co. LtdHangzhou 310030China

Developing a stable,reliable,and industrially compatible method to control hydrophobicity is crucial for separation,transportation,and the generation of special *** e-HMS-PDMS silica gel nanoparticle coating was prepared using a two-step electron beam irradiation(EBI)process,consisting of(i)grafting of two organic groups onto thiol-functionalized hollow mesoporous silica(HMS-SH)with 10 MeV EBI and(ii)curing of polydimethylsiloxane(PDMS)onto silicone rubber using the HMS hybrid materials prepared in step i as an additive with 200 keV *** tuneable grafting of functional groups and the surface properties of the silica,which was embedded in the PDMS layer,allowed us to precisely control the hydrophilicity of the PDMS layer by means of altering the grafting gradient of the silica and the loading ratio of the monomers.A diverse range of vinyl-structured monomers can be used in this method,and the selection of suitable monomers is vital in determining the physical properties of the coating *** hydrophilicity of the coating can be linearly controlled within a specific range(50°to 155°)by using suitable monomers,allowing for the design of surfaces with specific hydrophilic and hydrophobic requirements.

关键词： Electron beam irradiation Nanoparticle composite coating Hydrophilicity/hydrophobicity Thiol-ene click reaction

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Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 591-599页

作者： Guomin Li Xiaojie Xue Lutao Mao Yake Wang Lingxiao Li Guizhen Wang Kewei Zhang Rong Zhang Yuexiang Wang Liping Liang School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education Hainan UniversityHaikou 570228China State Key Laboratory for Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect Taiyuan 030032China

Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently utilized for *** CGR contains abundant carbon components,which could be applied to the microwave absorption field as the carbon *** this study,Fe/CGR composites are fabricated via a two-step method,including the impregnation of Fe^(3+)and the reduction *** influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is ***,the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate ***,Fe particles are evenly inserted on the CGR framework,which expands the Fe/CGR interfaces to enhance interfacial polarization,thus further improving the microwave-absorbing(MA)properties of ***,as the Fe^(3+)concentration is 1.0 mol/L,the Fe/CGR composite exhibits outstanding *** reflection loss reaches-39.3 dB at 2.5 mm,and the absorption bandwidth covers 4.1 GHz at 1.5 *** this study,facile processability,resource recycling,appropriately matched impedance,and excellent MA performance are ***,the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.

关键词： coal gasification residue recycling utilization composite microwave absorption

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Milestones, hotspots and trends in the development of electric machines

iEnergy

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iEnergy 2022年第1期1卷 82-99页

作者： Ronghai Qu You Zhou Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology430074 WuhanChina School of Electrical and Electronic Engineering Nanyang Technological Uni-versity639798Singapore

As one of the greatest inventions of human beings,the electric machine(EM)has realized the mutual conversion between electrical energy and mechanical energy,which has essentially led humanity into the age of electrification and greatly promoted the progress and development of human *** paper will briefly review the development of EMs in the past two centuries,highlighting the historical milestones and investigating the driving force behind *** the innovation of theory,the progress of materials and the breakthrough of computer science and power electronic devices,the mainstream EM types has been continuously changing since its *** paper will not only summarize the basic operation principle and performance characteristics of traditional EMs,but also that of the emerging types of ***,control and drive system,as a nonnegligible part of EM system,will be complementarily ***,due to the background of global emission reduction,industrial intelligentization and transportation electrification,EM industry will usher again in a golden period of ***,several foreseeable future developing trends will be analyzed and summarized.

关键词： Electric machine(EM) historical review industrial applications research hotspot technology development topology

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