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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Yang, Jichang Jiang, Dong Zhang, Yuanzhi Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728158266

Contactless power transfer (CPT) technology is developing rapidly in recent years. This paper introduces the circuit model of a typical CPT system with series-series (S/S) compensation topology. By analyzing the transfer function of a practical CPT system, with the load resistance changes, the bifurcation phenomenon might happen. In case of voltage source inverter with square wave modulation, there will be serious harmonic distortion in the primary and secondary current waveform, which might cause the drop of power factor. Using selective harmonic elimination pulse width modulation (SHEPWM) instead of square wave modulation could remedy this problem. With SHEPWM, the harmonic order will be increased, improving the waveform quality, and the requirement of filters also be decreased. Experimental results are provided to validate the harmonic problem, and show the effectiveness of the harmonic optimization method. © 2020 IEEE.

关键词： Inductive power transmission

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Privacy-preserving economic dispatch for microgrids with a distributed event-triggered communication scheme

Privacy-preserving economic dispatch for microgrids with a d...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Yan, Linfang Chen, Xia Zhou, Jianyu Shi, Mengxuan Yang, Qiufan Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728155081

This paper proposes a distributed algorithm to solve the economic dispatch problem (EDP) in microgrids based on an event-triggered mechanism with consideration of the privacy-preserving. To protect the privacy of participants in microgrids, each agent only needs to broadcast one local state by the well-designed algorithm. And a random noise is added based on the differential privacy to improve the privacy preservation further. Besides, the distributed algorithm is implemented by an event-triggered mechanism to reduce the consumption of communication resources and enhance the efficiency of algorithm execution. The simulations demonstrate the effectiveness of the proposed distributed algorithm. Compared to the continuous-time communication, the event-triggered mechanism can obtain the same convergence speed, but only consumes 30% communication resources. Statistical analysis shows that this method can protect privacy by introducing random noise. © 2020 IEEE.

关键词： Scheduling

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Enhanced room-temperature Na^(+) ionic conductivity in Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)

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eScience 2023年第6期3卷 935-945页

作者： Aikai Yang Kai Yao Mareen Schaller Enkhtsetseg Dashjav Hang Li Shuo Zhao Qiu Zhang Martin Etter Xingchen Shen Huimin Song Qiongqiong Lu Ruijie Ye Igor Moudrakovski Quanquan Pang Sylvio Indris Xingchao Wang Qianli Ma Frank Tietz Jun Chen Olivier Guillon Forschungszentrum Jülich GmbH Institute of Energy and Climate ResearchMaterials Synthesis and Processing(IEK-1)52425 JülichGermany Institute of Mineral Engineering(GHI) RWTH Aachen UniversityForckenbeckstraße 3352074 AachenGermany Institute for Applied Materials-Energy Storage Systems(IAM-ESS) Karlsruhe Institute of Technology(KIT)76344 Eggenstein-LeopoldshafenGermany Renewable Energy Conversion and Storage Center(RECAST) Haihe Laboratory of Sustainable Chemical TransformationsKey Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China Deutsches Elektronen-Synchrotron(DESY) Notkestrasse 8522607 HamburgGermany Laboratoire de Cristallographie et Sciences des Materiaux(CRISMAT) CNRSENSICAEN14000 CaenFrance Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials School of Materials Science and EngineeringPeking UniversityBeijing 100871China Institute of Materials Henan Academy of SciencesHenan Key Laboratory of Advanced Conductor MaterialsZhengzhou 450046China Max Planck Institute for Solid State Research Heisenbergstraße 170569 StuttgartGermany State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Key Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryCollege of ChemistryXinjiang UniversityUrumqiXinjiang 830046China Forschungszentrum Jülich GmbH Helmholtz Institute Münster(IEK-12)52425 JülichGermany Jülich Aachen Research Alliance JARA-Energy52425 JülichGermany

Developing cost-effective and reliable solid-state sodium batteries with superior performance is crucial for stationary energy storage.A key component in facilitating their application is a solid-state electrolyte with high conductivity and ***,we employed aliovalent cation substitution to enhance ionic conductivity while preserving the crystal *** substitution of Y^(3+)with Zr^(4+)in Na_(5)YSi_(4)O_(12) introduced Naþion vacancies,resulting in high bulk and total conductivities of up to 6.5 and 3.3 mS cm^(-1),respectively,at room temperature with the composition Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12)(NYZS).NYZS shows exceptional electrochemical stability(up to 10 V ***þ/Na),favorable interfacial compatibility with Na,and an excellent critical current density of 2.4 mA cm^(-2).The enhanced conductivity of Naþions in NYZS was elucidated using solid-state nuclear magnetic resonance techniques and theoretical simulations,revealing two migration routes facilitated by the synergistic effect of increased Naþion vacancies and improved chemical environment due to Zr^(4+)*** extends the list of suitable solid-state electrolytes and enables the facile synthesis of stable,low-cost Naþion silicate electrolytes.

关键词： Solid-state electrolytes Sodium superionic conductors Na_(4.92)Y_(0.92)Zr_(0.08)Si_(4)O_(12) High conductivity Ultra-wide electrochemical window

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Phase resolved partial discharge patterns of typical defects from generator stators with different size of samples

Phase resolved partial discharge patterns of typical defects...

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International Conference on High Voltage engineering and Application, ICHVE

作者： Cong Li Xiaosheng Peng Peng Ling Tao Liu Jin Zhou Yue Zhang School of Electrical and Electronic Engineering The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory Huazhong University of Science and Technology Wuhan China China Southern Power Grid Energy Storage Co Ltd Guangzhou China Dongfang Electric Machinery Co Ltd. Dongfang Electric Corporation Deyang China

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

Partial discharge (PD) is a common fault in power equipment, which poses a serious threat to the safe operation of large generators. This study is to analyze the phase resolved partial discharge (PRPD) mode of large generator stator in detail, and to explore the characteristics of different typical insulation defects in PRPD mode. In this study, typical defect types of stator bar are made, including delamination defects between the conductor and insulation, delamination defects between insulation and insulation, defects in the slot, and defects at the end. Voltage withstand tests were carried out at 20 kV, and PRPD patterns with 1, 10, 100, 1000 superposition groups of different defects were obtained. Main conclusions can be drawn as follows: (1) Unique shapes in patterns are evident at different superposition group sizes. As for delamination defects between the conductor and insulation, unique cluster can be clearly seen in low-number superposition groups but another unique cluster can be clearly seen in high-number superposition groups. (2) The PRPD patterns of different superposition groups of the same defect type can be well separated by t-SNE. As for defects in slot, the silhouette coefficients and rand coefficients gradually increase. (3) The more superimposed groups are, the better the PRPD patterns of different defect types can be distinguished. As for defects at the end, the discreteness gradually increases and the densities gradually decreases as the superposition groups increase.

关键词： Partial discharges Insulation Shape Voltage High-voltage techniques Conductors Stator bars

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Na3.8[Sn0.67Si0.33]0.8Sb0.2S4:A quinary sodium fast ionic conductor for all-solid-state sodium battery

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Journal of Energy Chemistry 2020年第9期29卷 102-106,I0003页

作者： Huanhuan Jia Linfeng Peng Zhuoran Zhang Tao An Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina School of Physics Huazhong University of Science and TechnologyWuhan 430074HubeiChin

Strategy of Sb-substitution is carried out on the template structure Na4Sn0.67M0.33S4(M=Si,Ge),which affords a series of quinary sulfide-based sodium fast ionic conductors formulated as Na4-x[Sn0.67M0.33]1-xSbxS4(M=Si,x=0.1,0.2,0.3;M=Ge,x=0.2.).Among them,the highest ambient ionic conductivity(1.75×10^-4 S cm^-1)is achieved when M=Si and x=*** new fast ionic conductor Na3.8[Sn0.67Si0.33]0.8Sb0.2S4 is isostructural to its structure template Na4Sn0.67Si0.33S4 and thus crystallizes in the space group of I41/*** is shown that the incorporation of Sb improves the ionic *** study of lattice parameters shows that the improvement of the ion conductivity by Sbsubstitution is mainly due to the enlarged crystal ***,using Na3.8[Sn0.67Si0.33]0.8Sb0.2S4as solid electrolytes,room temperature all-solid-state sodium battery of Se0.05S0.95@pPAN/Na3Sn is realized,which proves the novel fast ionic conductor a potential candidate to apply in sodium solid state *** work not only extends the scope of Na4[Sn0.67Si0.33]S4,the I41/acd space group template,but also deepens the understanding of the lattice size effect on the structure and property relationship by aliovalent substitution.

关键词： Sodium ionic conductor Aliovalent substitution Solid electrolytes Structure-property relationship All-solid-state sodium battery

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Strong coupling of plasmonic bright and dark modes with two eigenmodes of a photonic crystal cavity

arXiv

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arXiv 2023年

作者： Meng, Fanqi Cao, Lei Karalis, Aristeidis Gu, Hantian Thomson, Mark D. Roskos, Hartmut G. Physikalisches Institut Johann Wolfgang Goethe-Universität Frankfurt am Main Germany State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge United States

Dark modes represent a class of forbidden transitions or transitions with weak dipole moments between energy states. Due to their low transition probability, it is difficult to realize their interaction with light, let alone achieve the strong interaction of the modes with the photons in a cavity. However, by mutual coupling with a bright mode, the strong interaction of dark modes with photons is possible. This type of mediated interaction is widely investigated in the metamaterials community and is known under the term electromagnetically induced transparency (EIT). Here, we report strong coupling between a plasmonic dark mode of an EIT-like metamaterial with the photons of a 1D photonic crystal cavity in the terahertz frequency range. The coupling between the dark mode and the cavity photons is mediated by a plasmonic bright mode, which is proven by the observation of a frequency splitting which depends on the strength of the inductive interaction between the plasmon bright and dark modes of the EIT-like metamaterial. In addition, since the plasmonic dark mode strongly couples with the cavity dark mode, we observes four polariton modes. The frequency splitting by interaction of the four modes (plasmonic bright and dark mode and the two eigenmodes of the photonic cavity) can be reproduced in the framework of a model of four coupled harmonic oscillators. © 2023, CC BY.

关键词： Photons

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Substation Digital Twin Framework Design and key technology Research 3

Substation Digital Twin Framework Design and Key Technology ...

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

作者： Jia, Guo Jinghai, Xie Mi, Sun Dongyu, Su Tao, Wang Youhang, Yang Shaorong, Wang Economic and Technological Research Institute State Grid Jibei Electric Power Co. Ltd Beijing100038 China Tangshan Electric Power Prospecting and Designing Institute Co. Ltd Hebei063000 China School of Electrical and Electronic Engineering Hust Hubei30074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Digital twin (DT) is a key technology to improve the digital and intelligent level of substation operation and maintenance. In order to accelerate the application of DT in substations, this paper deeply studies the framework structure and key technologies of the substation DT. First, combined with the operational characteristics of substation, a five-dimensional DT model is proposed, which consists of physical entities of substation, digital models of substation, twin service, twin datasets, and the connection among the parts. Secondly, the framework structure for realizing the substation DT is designed, including device layer, perception layer, network layer, platform layer and application layer. Finally, the key technologies of substation DT are analyzed, and three technical aspects are elaborated from the application of 3D digital model fusion, the construction of substation lightweight digital model, and the interaction between data middle platform and application layer based on multi-agent. © 2022 IEEE.

关键词： Three dimensional computer graphics

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Solution for Invasion of Stray Current from Traction Power Supply System on AC Power System

Solution for Invasion of Stray Current from Traction Power S...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Jinli Zhu Chengxiong Mao Zhaoyuan Wang Dan Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (of HUST) Wuhan China

ISBN: (纸本)9781728164021

The stray current generated by the urban traction power supply system will invade the AC power system through the grounded transformer, and the intuitive impact is the abnormal operation of the transformer, such as the increase of noise and temperature. Based on the field measurement and characteristic analysis of neutral current, this paper presents the principle of stray current from traction power supply system invading AC network. To mitigate the stray current at the neutral point, a capacitor and a converter are connected in series to block the DC and harmonic currents respectively. And the influence of the series connection with the neutral point on the relay protection is discussed, and based on this, a reliable and reasonable bypass protection unit composed of the mechanical switch and the electronic switch is configured to ensure the safe operation of the system. The developed device has been tested and will be applied in the field substation.

关键词： Temperature measurement Semiconductor device measurement Substations Protective relaying Switches Power system harmonics Harmonic analysis

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Elastic properties of Cu-6wt%Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

arXiv

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arXiv 2024年

作者： Li, Ziyu Gu, Tianyi Wei, Wenqi Yuan, Yang Wang, Zhuo Luo, Kangjian Pan, Yupeng Xie, Jianfeng Zhang, Shaozhe Peng, Tao Liu, Lin Chen, Qi Han, Xiaotao Luo, Yongkang Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China School of Physics 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 School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan430074 China

Conductor materials with good mechanical performance as well as high electrical- and thermal-conductivities are particularly important to break through the current bottle-neck limit (∼ 100 T) of pulsed magnets. Here we perform systematic studies on the elastic properties of the Cu-6wt%Ag alloy wires, a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques - resonant ultrasound spectroscopy (RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu-6wt%Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this chance to test the availability of our newly-built ultrasound pulse-echo facility at Wuhan National High Magnetic Field Center (WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu-6wt%Ag alloy wire remains excellent without anomalous softening under extreme conditions, e.g., ultra-high magnetic field up to 50 T, nitrogen / helium cryogenic liquids. © 2024, CC BY.

关键词： Bottles

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Experimental Study on Influencing Factors of Seebek Coefficient by Using Nicr/Nisi Thin Film Thermocouple Prepared and Calibrated

SSRN

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SSRN 2024年

作者： Liu, Zhihui Shen, Kai Cheng, Yongjun Wang, Bi Zhou, Jiankang Wu, Mengxuan Sun, Yi Ding, Wanyu Wang, Zixi State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Engineering Research Center of Continuous Extrusion Ministry of Education Dalian Jiaotong University Dalian116028 China Laboratory of Low frequency Electromagnetic Communication Technology The WMCRT CSSC China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China

Accurate calibration of the Seebeck coefficient is crucial for reliable temperature measurements using thin-film thermocouples. In this study, we investigate the calibration of NiCr/NiSi thin-film thermocouples for precise temperature measurements. Using the magnetron sputtering method, we prepared a series of NiCr/NiSi film thermocouples and obtained their Seebeck coefficients through standard calibration procedures. The results demonstrate good consistency and reproducibility of the thermoelectric output within the temperature range of 0°C to 505°C. Notably, the Seebeck coefficients remain nearly constant regardless of changes in the top and bottom order or resistance values of the NiCr and NiSi thermoelectrodes. Furthermore, we found that the addition of an SiO2 protective film does not affect the calibration Seebeck coefficients of the NiCr/NiSi film thermocouples, with values of 7.94 μV/°C and 7.96 μV/°C for film thermocouples with and without SiO2, respectively. These findings provide valuable insights into the calibration of thin-film thermocouples and can enhance the accuracy of temperature measurements. The study contributes to scientific research and engineering applications in the field of thin-film thermocouple calibration. © 2024, The Authors. All rights reserved.

关键词： Seebeck coefficient

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