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Fault line selection in cooperation with multi-mode grounding control for the floating nuclear power plant grid

Protection and Control of Modern Power Systems 2020年第1期5卷 184-193页

作者： Yikai Wang Xin Yin Wen Xu Xianggen Yin Minghao Wen Lin Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Electrical Engineering and Electronics The University of LiverpoolLiverpool L693BXUK

The Floating nuclear power plant grid is composed of power generation,in-station power supply and external power *** ensure the safety of the nuclear island,the in-station system adopts a special power supply mode,while the external power supply needs to be adapted to different types of external *** of frequent single phase-ground faults and various fault forms,the fault line selection protection should be accurate,sensitive and *** paper presents a fault line selection method in cooperation with multi-mode grounding *** on the maximum united energy entropy ratio(MUEER),the optimal wavelet basis function and decomposition scale are adaptively chosen,while the fault line is selected by wavelet transform modulus maxima(WTMM).For high-impedance faults(HIFs),to enlarge the fault feature,the system grounding mode can be switched by the multi-mode grounding *** on the characteristic of HIFs,the fault line can be selected by comparing phase differences of zero-sequence current mutation and fault phase voltage mutation before and after the *** results using MATlab/Simulink show the effectiveness of the proposed method in solving the protection problems.

关键词： Floating nuclear power plant Multi-mode grounding control Wavelet transform modulus maxima(WTMM) Maximum united energy entropy ratio(MUEER) Phase difference Single phase-ground fault

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Design of a DC Busbar for the ITER PF Converter

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Plasma Science and technology 2014年第4期16卷 406-409页

作者：郭斌宋执权许留伟张明李金超蒋力傅鹏王敏董琳 College of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Institute of Plasma Physics Chinese Academy of Sciences China International Nuclear Fusion Energy Program Execution Center

The DC busbar is an important component for the ITER PF converter module to connect the converter and the reactor. This paper analyzes different cross-sections and different thermodynamic properties under natural-cooling and water-cooling conditions, and simulation is carried out by the software of the finite element method （FEM）. The result of the analysis shows that the water-cooling method is the better choice for the DC busbar.

关键词： cross-section temperature natural-cooling water-cooling DC busbar

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Asymmetric Feedforward Compensation For 3-Phase Coupled Buck-Boost Converter 5

Asymmetric Feedforward Compensation For 3-Phase Coupled Buck...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Han, Fu Shanxu, Duan Tao, Cai Junyang, Bao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In this paper, asymmetric operation of the 3-phase coupled buck-boost converter is analyzed. The form and solution process of the asymmetric operation are complicate, but the solution can be expressed and calculated in a simple form. By using parallel feedforward control, the dynamic performance of 3-phase coupled buck-boost converter can be improved obviously. Accuracy and effectiveness of the analysis and calculation are verified with the results of simulation and experiments. © 2022 IEEE.

关键词： Buck-Boost converter

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Low Temperature Plasma Sources for Effective Inactivation of Pathogenic Microbial Aerosols

Low Temperature Plasma Sources for Effective Inactivation of...

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2021 IEEE International Conference on Plasma Science, ICOPS 2021

作者： Liu, Dawei Huazhong University of Science and Technology State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering WuHan430074 China

ISBN: (纸本)9781665432276

In order to develop the LTP air filtration system which can effectively inactivate PMA, we studied the bioche mical mechanism of inactivating pathogenic microorganisms by LTP, and the physical process of charging and adsorption of PMA by LTP, and on this basis, we developed an efficient LTP source for effective inactivation of PMAs. The scalable prototype plasma air filtration system effectively killed all the bacteria within the inter cepted pathogenic aerosols. © 2021 IEEE.

关键词： Aerosols

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Static Hysteresis Process Modeling Based on Modified Tellinen Hysteresis Model 6

Static Hysteresis Process Modeling Based on Modified Telline...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Zhang, Yubo Chen, Dezhi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350346671

Modeling the process of the static magnetic hysteresis accurately is essential to compute the magnetic fields of electrical devices and components, and a modified static hysteresis model based on Tellinen hysteresis model is presented and verified in this paper. Only two measured ascending curves are needed to solve this static model, rather than the limiting loop, which is friendly to measuring device. By comparing the measured static hysteresis curves with the calculated static hysteresis curves, it is found that the static model shows good efficiency and accuracy, and the error caused by Tellinen hysteresis model itself could be negligible when the two measured curves the model demands are close to the curve to be computed. © 2023 IEEE.

关键词： Magnetic materials

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Ce3+-doped glass scintillator with high density and light yield for imaging application

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Ceramics International 2025年

作者： Yang, Dong Ge, Kun Ban, Huiyun Yuan, Huiping Qian, Sen Hua, Zhehao Cai, Hua Chen, Danping Han, Jifeng Qiao, Xvsheng Ren, Jing Sun, Xinyuan Tang, Gao Yin, Shenghua Zhang, Minghui Xiao, Jiawen Beijing Glass Research Institute Beijing101111 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Particle Detection and Electronics Beijing100049 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China China Building Materials Academy Beijing100024 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Lab of Radiation Physics and Technology of MOE Sichuan University Chengdu610065 China Key Laboratory of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341003 China State Key Laboratory of Silicon and Advanced Semiconductor Materials & Department of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Department of Physics and Key Laboratory of Jiangxi Province for Special Optoelectronic Artificial Crystal Materials Jinggangshan University Ji'an343009 China College of Materials and Chemistry China Jiliang University Hangzhou310018 China Nuclear Instrument CO. LTD. Beĳing100176 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai201899 China College of Materials Science and Engineering Beijing University of Technology Beijing100124 China

A series of Ce3+-doped Gd2O3-GdF3-Al2O3-B2O3-SiO2 glass scintillators (GSCx and GLCx) were successfully synthesized in reducing atmosphere for future imaging application. The transmittance of GSCx glasses exceeds 85 % in range of 500–800 nm, and the cut-off edge red shifts as the Ce3+ concentration increases. In photoluminescence (PL), GSCx glass scintillators have a 360–600 nm broadband emission with a shoulder peak at around 450 nm. Meanwhile, the PL lifetime of GSCx glasses is close to the CeF3 crystals, and the PL QY of GSC3 glass scintillator reaches up 70.2 %. For scintillation application, the integral XEL intensity of GSC2 and GSC3 glasses is 31.3 % and 24.4 % of that of BGO crystal. GLC2 and GLC3 glasses exhibit similar spatial resolution of approximately 7 lp·mm−1. Moreover, the light yields of GSC2 and GSC3 glass scintillator are 1702 and 1690 ph/MeV excited by γ-ray, respectively. The nonproportionality of GSCx glasses is less than 3 % in the range of 100–1400 keV due to the large density and Zeff. As Ce3+ concentration increases, both the fast and slow components of the glasses decrease (103.7 ns–89.7 ns, 1454.4 ns–1012.8 ns), and the proportion of fast component also increased from 3.3 % to 4.7 %. For γ-ray imaging, the scintillation light events of the glass can be observed from SiPM array, and the central position (−2, −1) have the highest count rate of the system. The results show that GSCx and GLCx glass scintillators deserve further development for future applications. © 2025

关键词： Gamma rays

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Rational Synthesis of Isomeric Graphdiyne Frameworks toward Single-Ruthenium Catalysts and High-Performance Nitrogen Reduction

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advanced Materials 2025年 e2502980页

作者： Feng, Boxu Zhang, Dong Han, Zhiya Shi, Pengfei Yan, Pu Zhao, Jinyu Huang, Senhe Jiang, Kaiyue Ji, Huiping Zhang, Jichao Zhu, Jinhui Lu, Chenbao Cao, Kecheng Zhuang, Xiaodong The Soft2D Lab State Key Laboratory of Metal Matrix Composites Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Physical Science and Technology & Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech University Shanghai201210 China School of Materials Shanghai Dianji University Shanghai200245 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences No. 239 Zhangheng Road Shanghai201204 China Frontiers Science Center for Transformative Molecules Zhangjiang Institute for Advanced Study Shanghai Jiao Tong University Shanghai201203 China

Graphdiynes (GDYs), synthesized via direct coupling of arylacetylenes, have attracted great attention due to their unique electronic properties and structural diversity, typically forming 2D layered frameworks. However, crystalline GDY-like frameworks with 3D topology remain challenging to synthesize. Here, the study reports two highly crystalline, isomeric GDY-like frameworks with ThSi2 topology, constructed from 2,2′-binaphthalene and 6,6′-biazulene-based monomers. The azulene-based framework, due to its large dipole moment, exhibits a narrow bandgap of 1.15 eV, significantly lower than its naphthalene counterpart (2.33 eV). As ruthenium (Ru) single-atom supports, these frameworks enable strong Ru-diyne interactions, achieving an ammonia yield rate of 188.7 ± 1.6 µg h−1 mgcat−1 and a Faradaic efficiency of 37.4 ± 0.6%. Such bicontinuous channels and tunable electronic structures offer electrocatalysis field new opportunities. Moreover, the azulene-based framework, featuring a higher highest occupied molecular orbital and lower lowest unoccupied molecular orbital energy level, ensures superior electron mobility. These 3D crystalline frameworks introduce a new covalent organic framework (COF) family with diyne linkages and pure carbon skeletons, broadening the scope of COF materials. Their well-defined structures provide an ideal platform for tuning optoelectronic properties, enabling fundamental studies on structure-property relationships and opening new opportunities for catalytic and electronic applications. © 2025 Wiley-VCH GmbH.

关键词： Molecular orbitals

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Characteristics Analysis of Three-Phase Symmetrical Phase-Locked Loop under Non-Ideal Grid Conditions

Characteristics Analysis of Three-Phase Symmetrical Phase-Lo...

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2023 IEEE International Conference on Power Science and technology, ICPST 2023

作者： Su, Tianyi Lin, Hua Li, Shaojie Wang, Xingwei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350311358

Under weak grids, the output impedance of grid-connected inverter is coupled with the grid impedance, leading to poor quality of the grid current. To address this issue, the symmetrical phase-locked loop (PLL) has been proposed which can eliminate the frequency coupling and attribute the system model to be symmetrical. Although the system performances well under steady state, the characteristics of the inverter is unclear under non-ideal conditions at present. In this article, by investigating the inverter performance with the symmetrical PLL under different grid conditions, it is founded that both the dynamic and steady-state characteristics become worse compared to that with synchronous reference frame (SRF) PLL. The experiments validate the correctness of the theoretical analysis. © 2023 IEEE.

关键词： Phase locked loops

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Investigation on the Arc Ignition Characteristics and Energy Absorption of Liquid Metal Current Limiter Based on Self-Pinch Effect

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Plasma Science and technology 2016年第5期18卷 531-537页

作者：琚兴宝孙海顺杨倬张俊民 State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) Wuhan 430074 China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China

The GaInSn liquid metal current limiter based on the fluid pinch effect has broad application prospects due to its particular properties. However, the limited rated current and abil- ity of power dissipation are the critical problems for its wide application. Firstly, the temperature distribution of the liquid metal current limiter （LMCL） was obtained by experiments with a rated current of 1 kA and the arc ignition phenomenon was observed with 1.5 kA, which indicates that the rated current is mainly limited by the arc rather than the high temperature compared to the traditional switchgears. Furthermore, an improved method is proposed by adding the paralleled pure resistance, impedance or another LMCL element to protect the setup from the fault energy concentration in the setup. The problem of a slower arc voltage increasing rate can be solved by adding a paralleled impedance with suitable parameters. Finally, the current limiting properties based on the improved method were investigated and the alternating oscillating current was found between two paralleled LMCL elements owing to their deviation of arc ignition in reality.

关键词： arc liquid metal current limiter fluid pinch effect

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Size Design of the Storage Tank in Liquid Hydrogen Superconducting Magnetic Energy Storage Considering the Coupling of Energy and Matter

Size Design of the Storage Tank in Liquid Hydrogen Supercond...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Wang, Chuang Li, Li Song, Meng Xu, Ying Hu, Kewei Zhong, Zhiyao Yang, Zhixing Fang, Jiakun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

The liquid hydrogen superconducting magnetic energy storage (LIQHYSMES) is an emerging hybrid energy storage device for improving the power quality in the new-type power system with a high proportion of renewable energy. It combines the superconducting magnetic energy storage (SMES) for the short-term buffering and the use of liquid hydrogen as both the bulk energy carrier and coolant. The storage tank is the core component of LIQHYSMES where the energy and matter are coupled. Therefore, this paper proposes the size design model for the storage tank in order to minimize the whole costs of LIQHYSMES. The thermal interactions between the SMES and hydrogen of both charging and discharging states are explicitly analyzed through the proposed model. Particularly, the phase transition of hydrogen in the storage tank, the charging state and thermal effect of SMES and the control strategy of electricity-hydrogen devices are modelled. Finally, case studies verified the effectiveness of the proposed model and the parameters of the storage tank are given. © 2023 IEEE.

关键词： coupling of energy and matter liquid hydrogen liquid hydrogen superconducting magnetic energy storage

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