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50th EPS Conference on Plasma Physics, EPS 2024

作者： Li, Y.B. Rao, B. Wang, N.C. Mao, F.Y. Li, K.Z. Zhou, S. Jiang, Z.H. Ding, Y.H. Suzuki, Y. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology China Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8527 Japan

ISBN: (纸本)9798331305239

The major disruption of tokamak plasma poses a great threat to safe operation of the device. Future fusion reactors are intolerant of major disruption, so developing control methods are crucial for disruption mitigation. Previous experiments on current-carrying stellarators and hybrid devices have demonstrated the potential for disruption avoidance and suppression of Magnetohydrodynamic (MHD) activity on tokamak by introducing increasing levels of rotational transform from stellarator- like helical coils. To explore innovative approaches for optimizing tokamak configurations and combining the strengths of both tokamaks and stellarators, a set of 3D External Rotational Transform (ERT) coil system has been designed and installed in the J-TEXT tokamak. The ERT coil system consists of two helical coils and is installed inside the vacuum vessel. Simulation results, via HINT2 and MIPS, indicate that the application of ERT coils results in hybrid configurations, which lead to non-axisymmetric plasma shapes, modification of the q profile, and improvement in plasma stability. The successfully installation of the ERT coil system on J-TEXT has yielded preliminary experimental results that align with the design objectives. © 2024 50th EPS Conference on Plasma Physics, EPS 2024. All rights reserved.

关键词： Stellarators

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A wind farm planning method considering frequency security constraint based on wind farm participation in primary frequency regulation 3

A wind farm planning method considering frequency security c...

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2024 3rd International Conference on Green Energy and Power Systems, ICGEPS 2024

作者： Jin, Chu Liu, Ruoping Zuo, Zhengmin Luo, Shuxin Li, Zuohong Liu, Shengfu Grid Planning & Research Center of Guangdong Power Grid Corporation Guangzhou510080 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Renewable energy sources such as wind power, connected to the grid on a large scale, reduce the rotational inertia and frequency regulation of the power system. Many studies have included frequency security constraints (FSC) in power system scheduling to ensure system frequency stability, but few studies have included FSC in grid planning. Therefore, this paper establishes a planning model for wind farms that considers the FSC based on the wind turbines' participation in the primary frequency regulation (PFR) by obtaining the maximum deviation value constraint of the system frequency through the system frequency response (SFR) model. Tests were conducted on the IEE30-node system, and the results show that the proposed model enhances the system frequency response capability and ensures system security. © Published under licence by IOP Publishing Ltd.

关键词： Frequency response

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An Experimental Study on the Characteristics of Gliding Arc Discharge in CO2 Dissociation with an Inlet Laval Nozzle 5th

An Experimental Study on the Characteristics of Gliding Arc ...

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5th International Symposium on Plasma and Energy Conversion, iSPEC 2023

作者： Zhang, Zixiao Liu, Yang Zhao, Xiangen Du, Yaping He, Junjia State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic University 999077 Hong Kong

ISBN: (纸本)9789819722440

The Gliding Arc Discharge (GAD), a kind of non-equilibrium plasma, has gathered substantial interest in the domain of CO2 decomposition due to its high energy efficiency. Current research has demonstrated that the flow rate significantly impacts the CO2 dissociating, but the discharge characteristic is not well understood. In this paper, experiments were carried out to compare the GAD characteristics in CO2 dissociating between the traditional reactor and the reactor featuring an inlet Laval nozzle, in which current and voltage waveforms, high-speed optical images, and Schlieren images were recorded simultaneously. The experimental results show that in the reactor with an inlet Laval nozzle, the re-ignition voltage, discharge period, and power decreased by 75%, 39%, and 87%, respectively, and a higher probability of back-breakdown occurring at the same flow rate (4 L/min), compared to the typical GAD reactor. In addition, although the luminosity of the GAD plasma diminished, the intensified turbulence caused by the high flow rate inside the reactor through the Laval nozzle expanded the diffusion region of the hot gas. These findings highlight the multi-perspective discharge characteristics of high-flow-rate GAD, thereby enhancing comprehension of the diverse mechanisms through which high flow rate affects CO2 conversion. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Nozzles

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First-Principles Study on the Cu–Cr Interfaces in Vacuum Circuit Breaker Contacts 4th

First-Principles Study on the Cu–Cr Interfaces in Vacuum Ci...

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4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Gui, Xianxian Wu, Chuanqi Yuan, Zhao Wang, Cao Liu, Liming Chen, Lixue State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China

ISBN: (纸本)9789819974047

Based on the experimental phenomenon that the breakdown position of the CuCr contact head in a vacuum circuit breaker may be the Cu–Cr phase boundary, the Cu–Cr interfacial binding models have been developed. The work function, work of interfacial separation, interfacial energy, charge transfer, and charge density distribution of Cu, Cr and W, Fe, Ni and Mo doped Cu/Cr interfaces are calculated from the first principles. The CuCr interface junction was found to have a smaller work function than pure copper and pure chromium. The reduced work function is prone to field emission, thus increasing the possibility of electrical breakdown. Three interfacial binding models Cu(110)/Cr(110), Cu(111)/Cr(111) and Cu(110)/Cr(100) are established in this paper. By comparing the separation work and interfacial energy, it is found that Cu(111)/Cr(111) is relatively stable. The charge transfer is ordered as W > Mo > Ni > Fe from large to small. This order is roughly the same as the atomic numbers of the four metals. The doping of W, Fe, Ni and Mo to make their work function reach the expected value is ranked as W > Ni > Fe > Mo. In this paper, we provide a theoretical basis for increasing the voltage strength of vacuum circuit breakers. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Electric circuit breakers

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Modeling Analysis of Efficiency Improvement of Passive Array Coils Involved in Wireless Power Transfer System 1

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10th Frontier Academic Forum of Electrical engineering, FAFEE 2022

作者： Chen, Mengmeng Lu, Yang Liu, Renzhe Wu, Zhousen Rong, Cancan Xia, Chenyang Liao, Zhijuan Liu, Xu School of Electrical Engineering China University of Mining and Technology Xuzhou221116 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819934041

ISBN: (纸本)9789819934034

The transmission efficiency of wireless power transfer system is generally low due to the large transmission distance. In addition, the transmitter and receiver are usually fixed, which will lead to weak robustness as well. In the paper, the solenoid array coils (SAC) are design to increase the mutual coupling between the two coils, which will enhance the transfer efficiency. SACs are composed of recycled array coils (RAC) and concentrated array coils (CAC), which are used to improve the density of magnetic lines of flux between the transmitter and the receiver. In this paper, the design process and modeling process are described in detail. The simulation results show that the transmission efficiency of the wireless power transfer system is improved from 72.79% to 83.01% after optimization. Moreover, the distribution of the system magnetic field and the circuit simulation waveforms also verify the correctness and feasibility of the passive array coils analysis and design, and provide a solution for the existing engineering problems. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Circuit simulation

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Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Boundary 3

Electronic Structure of a Co-Doped ZnO 12 30)Σ=7 Grain Bou...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zhang, Xiaoxuan He, Junjia Song, Li Zhou, Benzheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology 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 Wuhan430074 China

ISBN: (纸本)9781665477321

The electronic properties of Co-doped Σ=7[0001] grain boundaries in ZnO were investigated using first-principles calculations due to the important role of Co in ZnO varistor ceramics. Grain boundary segregation calculations show that for Σ=7 grain boundaries, the driving force of Co segregation at grain boundaries is strong, and the segregation energy of interstitial filling is lower than that of grain boundary substitution. We obtain negative segregation energies at the two grain boundary sites, indicating that Co aggregates at the grain boundaries. The analysis of the band structure, electronic density of states and plane-averaged charge density shows that the pure Σ=7 grain boundary will lead to the generation of shallow-level acceptor states due to the breaking of bonds at the grain boundary, but it will not cause nonlinear I-V characteristics. Calculations for doping Σ=7 grain boundaries show that Co produces local impurity states at the grain boundaries and acts as a donor dopant, the conduction band intersects with the Feimi level, enhancing the grain boundary conductivity. © 2022 IEEE.

关键词： Grain boundaries

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Low-Temperature Carbonized Nitrogen-Doped Hard Carbon Nanofiber Toward High-Performance Sodium-Ion Capacitors

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Energy & Environmental Materials 2023年第4期6卷 129-136页

作者： Congkai Sun Xiong Zhang Yabin An Chen Li Lei Wang Xiaohu Zhang Xianzhong Sun Kai Wang Haitao Zhang Yanwei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Advanced Fibers and Energy StorageSchool of Material Science and EngineeringTiangong UniversityTianjin 300387China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan 250013China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Carbon nanofiber(CNF)was widely utilized in the field of electrochemical energy storage due to its superiority of conductivity and ***,CNF was generally prepared at relatively high ***,nitrogen-doped hard carbon nanofibers(NHCNFs)were prepared by a lowtemperature carbonization treatment assisted with electrospinning *** functional theory analysis elucidates the incorporation of nitrogen heteroatoms with various chemical states into carbon matrix would significantly alter the total electronic configurations,leading to the robust adsorption and efficient diffusion of Na atoms on electrode *** obtained material carbonized at 600°C(NHCNF-600)presented a reversible specific capacity of 191.0 mAh g^(−1)and no capacity decay after 200 cycles at 1 A g^(−1).It was found that the sodium-intercalated degree had a correlation with the electrochemical impedance.A sodium-intercalated potential of 0.2 V was adopted to lower the electrochemical *** constructed sodium-ion capacitor with activated carbon cathode and presodiated NHCNF-600 anode can present an energy power density of 82.1 Wh kg^(−1)and a power density of 7.0 kW kg^(−1).

关键词： electrochemical presodiation low-temperature carbonization nitrogen-doped hard carbon nanofibers sodium-ion capacitors

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Correlation Analysis of Altitude and Lightning Trip Rate Based on R Language 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Cheng, Luqing Zhang, Dandan Wan, Zhiyu Hou, Guobin School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819713516

ISBN: (纸本)9789819713509

To explore the relationship between altitude and lightning trip rate, this paper uses R language to study the monitoring data of lightning positioning system in a certain area from 2012 to 2022. The changes in altitude and lightning trip rate of different voltage levels in this area were analyzed, and the correlation between the two was visually displayed. On the basis of correlation analysis, a regression model of the two is established, and the univariate linear mathematical relationship expression of altitude and lightning trip rate is obtained. The results show that there is a strong positive correlation between altitude and lightning trip rate, and the fitting effect of the regression analysis model is better, which provides an important basis for further research on lightning-related problems and provides a reference for the improvement and optimization of lightning information system. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Lightning

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Branching Behavior of Continuous Leaders in Positive laboratory Long Air Discharges 37

Branching Behavior of Continuous Leaders in Positive Laborat...

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37th International Conference on Lightning Protection, ICLP 2024

作者： Guo, Lili Wang, He He, Junjia Zhang, Zhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China

ISBN: (纸本)9783800764174

An essential inquiry in long air discharge pertains to why the discharge channel generates extensive branches. Here we have studied the extensive optical measurements of continuous leader channel branching. An exploration into branching behaviours shows a tendency for positive leaders to bifurcate or trifurcate, with a preference for bifurcation. The findings notably reveal a decrease in branching frequency as the channel approaches the ground electrode. Moreover, over 80% of branching events occurred within a ±30°angle range in front of the high-voltage electrode before breakdown. Statistical analysis of 280 bifurcations identifies three distinct branching types, with Type I being the most common and Type II the least frequent. Type II exhibits the narrowest branching angle range and lowest average, while in Type I branching, the deflection angle distributions of the left and right branches are essentially similar. Finally, the variation noticed in the partial velocity of the primary leader is notably affected by the development of sub-branches. That is a process driven by the elongation and branching of stems ahead of the already thermalized channel. Due to the complexity of branching behaviours and the limited research findings, our understanding of positive polarity leader analysis remains incomplete. Questions such as why the branching occurs, the patterns of branching, and the factors leading to branching behaviours still require further exploration. Regarding the above issue, the article statistically analysed the branching behaviour of hundreds of positive polarity long gap discharges conducted in this study, focusing on aspects such as the number of branches, the locations of branching occurrences, and the morphological characteristics of branching. Furthermore, we analysed the impact of branching on the velocity of the main discharge channel. © 2024 IEEE, © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Robotics

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Tungsten chalcogenides as anodes for potassium-ion batteries

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Tungsten 2024年第2期6卷 278-292页

作者： Yu-Han Wu Wei-Hao Xia Yun-Zhuo Liu Peng-Fei Wang Yu-Hang Zhang Jin-Ru Huang Yang Xu De-Ping Li Li-Jie Ci School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Chemistry University College LondonLondon WC1H 0AJUnited Kingdom

Potassium-ion batteries(PIBs)by virtue of their strong cost competitiveness and similar electrochemical properties to lithiumion batteries have been deemed to be a promising electrochemical energy storage *** promote the application in the commercial market,developing electrode materials with high specifi c capacities,superior cycling stability,and reliable safety is of great *** materials as an important component of PIBs play a decisive role,among which twodimensional transition metal chalcogenides(2D TMCs)have attracted wide attention owing to their unique material and electrochemical *** the 2D TMCs’family,molybdenum chalcogenides as fl agship are the most studied materials and demonstrated the potential as *** the deepening of research on 2D TMCs,another shining member that possesses similar properties to molybdenum chalcogenides,tungsten chalcogenides(WS_(2),WSe_(2),and WTe_(2)),has aroused tremendous *** many inspiring results,various challenges remain to be further addressed;meanwhile,some results are still unclear and ***,this review fi rst introduces their material properties and electrochemical storage ***,we systematically overview the research progress and put forward promoting improvement ***,challenges and opportunities that would be future research directions are discussed.

关键词： Electrochemical energy storage Potassium-ion batteries Anodes Tungsten chalcogenides

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