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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Chen, Guilun Ren, Li Li, Xianhao Long, Feiyang Wu, Jiajie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350301571

High-temperature superconducting (HTS) cable may suffer from various types of fault hazards during operation, and lead to the quench, endangering cable safety. The temperature distribution along HTS cable is usually inhomogeneous, which is a direct factor in determining the superconducting performance and operational stability of the cable. However, it is still difficult to achieve effective monitoring of temperature distribution along the cable in actual projects. In this paper, thermal characteristic of concentric HTS cable under various fault scenarios is analyzed, focusing on the temperature distribution of the cable. The results will provide a reference for the study of condition monitoring schemes for the HTS cable. © 2023 IEEE.

关键词： HTS cable temperature distribution thermal characteristic under faults

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Research on inductance gradient of electromagnetic railgun based on eddy current field analysis 10

Research on inductance gradient of electromagnetic railgun b...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xu, Shengqin Chen, Lixue Xu, Shengqin Zhang, Wenhao Zhao, Bingxuan Xiao, Tingyun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

Inductance gradient has a significant effect on muzzle kinetic energy and launch efficiency in electromagnetic railgun. Inductance gradient is determined by the current distribution in the armature and rail, transient skin effect, velocity skin effect, and proximity effect are the main physical mechanisms affecting the current distribution of electromagnetic railgun. Additionally, the structure and size of the rail also have an impact on current distribution. In order to analyze inductance gradient, the control equation of the electromagnetic railgun is analyzed, and the 3D motion model of the electromagnetic railgun is established. The distribution of the 3D current and magnetic field under the influence of the velocity skin effect is calculated, and then the time-varying curves of the inductance gradient during the whole launch process are drawn, curves show that the inductance gradient trend when velocity skin effect is considered is opposite to that not considered. At the same time, the inductance gradient under different rail structures is compared by simulation calculation, the results show that the inductance gradient of the rectangular rail is larger than that of the T-shaped rail and the arc-shaped rail. Finally, the effect of the dimensions of the rectangular rail on the inductance gradient is investigated, and the results show that the inductance gradient of the rectangular rail decreases gradually with the increase of the rail width, and increases and then decreases with the increase of the rail height. © 2024 Eindhoven University of technology.

关键词： Kinetic energy

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Design and performance study of a dielectric-filled cavity beam current monitor for HUST-PTF

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Nuclear Science and Techniques 2023年第8期34卷 75-85页

作者： Ji-Qing Li Kuan-Jun Fan Zheng-Zheng Liu Jian Wang Qu-Shan Chen Jin-Feng Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China The Institute of Scientific and Industrial Research Osaka University8-1 MihogaokaIbarakiOsaka 567-0047Japan

To guarantee the exact proton dose applied to patients and ensure treatment safety while disrupting and destroying tumor cells,it is essential to accurately monitor the proton beam current in real time during patient *** clinical treatment requires a proton beam current in the∼nA range,nondestructive beam current monitors(BCMs)are preferred to minimize the degradation of beam ***,this poses significant challenges in accurately monitoring such extremely low beam *** study proposes a cavity-type BCM equipped with a dielectric plate to reduce its dimensions and achieve sufficient measurement sensitivity for practical requirements.A prototype cavity BCM was fabricated,and off-line testing was performed using a metal wire to simulate the beam to study its *** the simulation and experi-mental results showed that the cavity BCM could measure ultralow proton beam currents with a resolution up to 0.03 nA.

关键词： Proton therapy Beam current Cavity BCM Nondestructive

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Stability Evaluation of the Dual-terminal Structure DC Distribution Power Systems with Multiple DC Transformers 4

Stability Evaluation of the Dual-terminal Structure DC Distr...

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4th IEEE china International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Chen, Yangfan Zhao, Mengyuan Zhang, Yu School of Electrical and Electronics Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350305562

To improve the load capability, operating efficiency and power density of the DC distribution power systems (DDPSs), the application of dual-terminal structure (DTS) composed of multiple DC transformers (DCTs) is widely expanding. Focusing on the cascaded stability, the active damping methods for DCTs are widely researched to suppress the oscillation. However, there are few studies discussing whether the DDPS composed of DCTs controlled by active damping methods is still stable. Therefore, this paper firstly builds an impedance model for a DTS DDPS. Then, the stability of a DTS DDPS composed of all-active-damping-controlled DCTs is evaluated based on the Nyquist Criterion. Finally, simulation results show that a DTS DDPS is stable with a high margin when composed of all-active-damping-controlled DCTs, which has fast dynamic speed and good balance ability. © 2023 IEEE.

关键词： DC transformers

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An Improved Method for Combining the Power Station Operation Modes Based on the Variation Trend of the Power Source Contribution Coefficient 37th

An Improved Method for Combining the Power Station Operation...

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

作者： Zou, Yi Ren, Kangjie Li, Yinhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

The combination of operation modes in relay protection setting calculation is the basis to ensure the correct action of the relay protection device. The power source contribution coefficient method combines the power station operation modes in calculating positive-sequence auxiliary increasing coefficient. It has the characteristics of calculating all stations, having a small number of combinations, and possibly requiring iterative calculations in the ring network. Based on this, this paper analyzes the effect of station location on the auxiliary increasing coefficient and discusses the iterative problem in ring networks. An improved method for combining the power station operation modes based on the variation trend of the power source contribution coefficient is proposed. Based on the variation trend, all the power stations with clustering errors are screened out in advance, which will be re-divided into the correct clustering. The auxiliary increasing coefficient can be worked out by setting the same operation mode for the stations in the same clustering group. Simulation case shows that the improved method can realize correct station clustering, avoid multiple iterative calculations, and ensure efficiency. The work was supported by the state Grid Corporation Science and technology Project under Grant 5100-202199558A-0-5-ZN. © 2023, state Grid Electric Power.

关键词： Relay protection

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Effect of Ni interlayer on microstructures and mechanical properties of 2205 duplex stainless steel joint by laser oscillating welding

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Journal of Iron and Steel Research International 2024年第10期31卷 2463-2474页

作者： Jing-wei Yang Xu-yang Liu Tao Li Lai-cai Chen Kai Yang Zong-ye Ding Jie Zhang Jian Qiao School of Mechatronic Engineering and Automation Foshan UniversityFoshan528000GuangdongChina Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education Guizhou UniversityGuiyang550025GuizhouChina State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and TechnologyLuoyang471023HenanChina School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China

Laser oscillating welding of 2205 duplex stainless steel was performed using Ni interlayer as filler *** influence of stirring effect caused by laser oscillating and Ni addition in the behavior of molten pool and the microstructure evolution was *** results shows that Ni addition decreased the ratio of chromium equivalent and nickel equivalent in the molten pool and accelerated the austenitic *** austenite/ferrite ratio was regulated,and the precipitation of nitrides was suppressed in the weld *** stirring effect caused by the oscillating beam facilitated the uniform distribution of Ni elements within the molten pool,promoting the formation of the homogeneous microstructures in the weld *** increasing the thickness of Ni interlayer,both the dimension and the peak temperature of molten pool decrease,further increasing the cooling rate and refining the grain *** the thickness of Ni interlayer was 50μm,the austenite/ferrite ratio in the weld seam was close to 1:1,and the grain size reached the minimum *** tensile strength and ductility of the welded joint using Ni interlayer with thickness were 774 MPa and 25%,respectively,significantly improving the mechanical properties of 2205 duplex stainless steel joint welded without Ni addition.

关键词： 2205 duplex stainless steel Ni interlayer Laser welding Microstructure Mechanical property

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One-step electrochemical in-situ Li doping and LiF coating enable ultra-stable cathode for sodium ion batteries

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Journal of Energy Chemistry 2023年第7期82卷 228-238,I0005页

作者： Jiameng Feng Chaoliang Zheng De Fang Jianling Li State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Despite of the higher energy density and inexpensive characteristics,commercialization of layered oxide cathodes for sodium ion batteries(SIBs)is limited due to the lack of structural stability at the high ***,the one-step electrochemical in-situ Li doping and LiF coating are successfully achieved to obtain an advanced Na0.79Lix[Li_(0.13)Ni_(0.20)Mn_(0.67)]O_(2)@LiF(NaLi-LNM@LiF)cathode with superlattice *** results demonstrate that the Li^(+)doped into the alkali metal layer by electrochemical cycling act as"pillars"in the form of Li-Li dimers to stabilize the layered *** supplementation of Li to the superlattice structure inhibits the dissolution of transition metal ions and lattice ***,the in-situ LiF coating restrains side reactions,reduces surface cracks,and greatly improves the cycling *** electrochemical in-situ modification strategy significantly enhances the electrochemical performance of the *** NaLi-LNM@LiF exhibits high reversible specific capacity(170.6 m A h g^(-1)at 0.05 C),outstanding capacity retention(92.65%after 200 cycles at 0.5 C)and excellent rate performance(80 mA h g^(-1)at 7 C)in a wide voltage range of 1.5-4.5 *** novel method of in-situ modification by electrochemical process will provide a guidance for the rational design of cathode materials for SIBs.

关键词： Sodium ion batteries Layered oxides In-situ Li doping In-situ LiF coating Superlattice structure

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An anonymous authentication and secure data transmission scheme for the Internet of Things based on blockchain

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Frontiers of Computer Science 2024年第3期18卷 183-197页

作者： Xingxing CHEN Qingfeng CHENG Weidong YANG Xiangyang LUO State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Institute of Information Science and TechnologyZhengzhou 450001China Henan Key Laboratory of Grain Photoelectric Detection and Control Henan University of TechnologyZhengzhou 450001China Henan Province Key Laboratory of Cyberspace Situation Awareness Zhengzhou Institute of Information Science and TechnologyZhengzhou 450001China

With the widespread use of network infrastructures such as 5G and low-power wide-area networks,a large number of the Internet of Things(IoT)device nodes are connected to the network,generating massive amounts of ***,it is a great challenge to achieve anonymous authentication of IoT nodes and secure data *** present,blockchain technology is widely used in authentication and s data storage due to its decentralization and ***,Fan et *** a secure and efficient blockchain-based IoT authentication and data sharing *** studied it as one of the state-of-the-art protocols and found that this scheme does not consider the resistance to ephemeral secret compromise attacks and the anonymity of IoT *** overcome these security flaws,this paper proposes an enhanced authentication and data transmission scheme,which is verified by formal security proofs and informal security ***,Scyther is applied to prove the security of the proposed ***,it is demonstrated that the proposed scheme achieves better performance in terms of communication and computational cost compared to other related schemes.

关键词： Internet of Things blockchain authentication data transmission

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Ozone Generation by DC Needle-Needle Discharge at Atmospheric Pressure 3

Ozone Generation by DC Needle-Needle Discharge at Atmospheri...

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3rd International Conference on Energy, Power and Electrical engineering, EPEE 2023

作者： Wang, Weiyi Li, Mengqi Wang, Bingkai Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350318180

In this study, the effect of discharge gap and applied voltage on the ozone generation by DC needle-needle discharge was investigated. The relationship between the production efficiency and the energy cost as well as the generation rate were discussed. It has been found that under all experimental conditions, the ozone concentration increased with processing time, but under the same gap distance, the ozone concentration and generation rate initially increased and then decreased with the increase of the applied voltage and injected energy. The energy cost of ozone generation under the discharge power and the total power were calculated and compared. The energy cost basically increased with the applied voltage and power consumption. Therefore, to obtain the optimal parameters for ozone production, both the energy cost and the generation rate should be considered. © 2023 IEEE.

关键词： air plasma energy cost needle-needle discharge ozone generation

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Single-Pole Fault Injection Directional Pilot Protection for Flexible DC Lines 17th

Single-Pole Fault Injection Directional Pilot Protection for...

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17th Annual Conference of china Electrotechnical Society, CES 2022

作者： Ma, Ruizhi Wen, Minghao Chen, Yu Han, Ke Wang, Xingzhu Han, Xiangyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904075

In the case of single-pole ground fault on the transmission line of MMC-based DC system, the single-ended protection has poor endurance to high-impedance faults, while the double-ended protection performance is limited by the pilot channel. This paper proposed a pilot protection scheme using sound pole active injection of feature signals. Based on the controlled characteristics of hybrid MMC during DC line faults, the DC fault ride-through control strategy is developed considering the requirements of relay protection, using the sound pole commutation valve to actively inject the feature frequency sinusoidal signal into the line during single pole faults, and realizing the fault direction information interaction through the detection of the feature frequency signal to achieve fault discrimination within and outside the DC line. Simulation results show that the protection algorithm proposed in the paper accurately identifies the fault area under the condition of a single pole fault with 500 Ω transition resistance within 10 ms after the fault. The protection scheme does not depend on the pilot channel and line boundary elements and requires low sampling rate. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Poles

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