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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Song, Li Zhou, Benzheng Yao, Chengfeng He, Junjia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819618552

ZnO varistors prepared by surface coating technology show certain potential in reducing grain size, refining microstructure, and improving electrical properties. The sintering process after powder preparation also has a decisive influence on the performance of the varistor. In this study, based on the simplest binary formulation of ZnO, the common additives SiO2 and Bi2O3 were selected to form ZS and ZB binary system. The surface-coated composite powder and mechanically mixed composite powder were prepared in two kinds of system. The differences of coated powder and mixed powder in sintering process at high temperature were compared from three aspects: powder morphology, thermal analysis, and phase analysis. The results can provide a reference for the sintering process optimization of ZnO coated powder. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Sintering

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Rotating Object Detection Method of Insulator Defect Base on Improved YOLOv5 11th

Rotating Object Detection Method of Insulator Defect Base on...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Wang, Yunxuan Yong, Yang Li, Chuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

The precise localization of insulators in visible images is crucial for ensuring the integrity of power systems. In UVAs inspections, challenges such as arbitrary angles, dense distributions, and complex backgrounds often hinder accurate detection. However, existing methods primarily employ axial horizontal detection boxes to detect insulators, which overlook insulator characteristics. To further improve the accuracy, this paper optimizes YOLOv5 across four key areas: rectangular box representation, feature extraction, lightweight convolution, and detection head design. The results show that this paper uses rotating detection boxes instead of axial horizontal detection boxes, which removes a large amount of redundant background information and improves the average accuracy and operation speed. Our experiments on the insulator defect dataset achieved the average accuracy of 97.91% at an intersection ratio of 0.5. Additionally, our algorithm shows promise for extending to defect detection in various power equipment, laying a solid foundation for future automation initiatives. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric insulators

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Advance Warning Prior to Capacity Plunge of Liquid Metal Battery Using Data-driven Methods

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IEEE Transactions on Industry Applications 2025年第3期61卷 4147-4154页

作者： Shi, Qionglin Zhou, Min Li, Haomiao Wang, Kangli Jiang, Kai Ministry of Education Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Wuhan China

The liquid metal battery (LMB) has gained attention as a novel energy storage technology due to its exceptional safety and long lifespan. Analyzing the aging trajectory, particularly capacity plunge process, is crucial for understanding its aging mechanism and enabling effective health diagnosis. However, it often lacks clear warning signs prior to the capacity plunge, hindering accurate capacity prediction and proactive measures in real-world applications. To address this challenge, this study proposes a data-driven method that effectively quantifies the capacity various in LMBs, enabling advance warning before the occurrence of a capacity plunge. Firstly, the Empirical Mode Decomposition method decomposes the capacity data into several components, representing different characteristics of LMBs. Subsequently, a Gaussian mixture model is applied to construct the feature distribution for each component, which exhibits a hump-shaped pattern. Finally, The Jensen-Shannon divergence is used to quantify the divergence of these humps, offering a concrete measure of LMB health and aging progression. The proposed method integrating both aging analysis and data-driven insights provides an advance warning of the capacity plunge, offering a reliable foundation for future lifespan prediction and fault diagnosis of LMBs. © 2025 IEEE.

关键词： Network security

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Interfacial modulation of nano Li_(7)La_(3)Zr_(2)O_(12) composite electrolytes prepared by solvent-free method

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Green Energy & Environment 2025年第3期10卷 528-536页

作者： Qigao Han Yaqing Guo Fuhe Wang Xuechun Lou Fengqian Wang Jun Zhong Jinqiao Du Jie Tian Weixin Zhang Shun Tang Shijie Cheng Yuancheng Cao Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China Shenzhen Power Supply Co.Ltd. Shenzhen518001China

Solid-state batteries(SSBs) with high safety are promising for the energy fields,but the development has long been limited by machinability and interfacial ***,self-supporting,flexible Nano LLZO CSEs are prepared with a solvent-free method at 25℃.The 99.8 wt% contents of Nano LLZO particles enable the Nano LLZO CSEs to maintain good thermal stability while exhibiting a wide electrochemical window of 5.0 V and a high Li~+ transfer number of *** mean modulus reaches 4376 *** from the interfacial modulation,the Li|Li symmetric batteries based on the Nano LLZO CSEs show benign stability with lithium at the current densities of 0.1 mA cm^(-2),0.2 mA cm^(-2),and 0.5 mA cm^(-2).In addition,the Li|LiFePO_(4)(LFP) SSBs achieve favorable cycling performance:the specific capacity reaches128.1 mAh g^(-1) at 0.5 C rate,with a capacity retention of about 80% after 600 *** the further tests of the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) cathodes with higher energy density,the Nano LLZO CSEs also demonstrate good compatibility:the specific capacities of NCM811-based SSBs reach 177.9 mAh g^(-1) at 0.5 C rate,while the capacity retention is over 96% after 150 ***,the Li|LFP soft-pack SSBs verify the safety characteristics and the potential for application,which have a desirable prospect.

关键词： Solvent-free method Nano LLZO CSEs Interfacial modulation Cycling performance Safety characteristics

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Conversion-type cathode materials for high energy density solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期100卷 409-425页

作者： Yuhao Ma Shihong Qing Hongyu Liu Chuntao Ma Yuan Yu Chuang Yu Liping Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Solid-state lithium batteries(SSLBs)are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,SSLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of SSLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes(SSEs),as well as state-of-the-art progress in various promising cathodes(e.g.,FeS_(2),CuS,FeF_(3),FeF_(2),and S)in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the S cathode stands out impressively,while sulfide SSEs and halide SSEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density SSLBs.

关键词： Conversion-type cathode Lithium-free cathode Solid-state electrolyte Solid-state lithium battery High energy density

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A DSVM-based MPC Strategy with Magnetizing Inductance Online Identification Method for Thrust Ripple Suppression in Linear Induction Machine

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IEEE Transactions on Power Electronics 2025年第8期40卷 10746-10757页

作者： Guo, Yingcong Xu, Wei Ge, Jian Xiao, Han Tang, Yirong Shangguan, Yongdao Southwest Jiaotong University School of Electrical Engineering Chengdu610031 China Beijing100190 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

The conventional discrete space vector modulation-based model predictive control (DSVM-MPC) strategies in linear induction machines (LIMs) have two problems, one is that the current harmonics and thrust ripple are large as accuracy of the voltage vector (VV) is insufficient under the limited computational burden, and the other is that the parameter robustness is poor. To solve these problems, an improved DSVM-MPC strategy with magnetizing inductance online identification method for LIMs is proposed. Firstly, an improved virtual VV discretization method and an optimal VV searching method are proposed, which can obtain more accurate VV with less computational burden compare to conventional DSVM-MPC strategies. Then, to improve the parameter robustness, a magnetizing inductance online identification method based on back electromotive force (EMF) is proposed, and a sliding mode observer (SMO) is designed to observe back EMF, which effectively avoids the current differential term. Furthermore, an adaptive compensation algorithm for cascaded low-pass filters is conceived to effectively suppress the inherent chattering of the SMO, and the amplitude and phase of the fundamental wave are appropriately compensated. Finally, the superiority of the proposed method is verified through comprehensive simulations and experiments on a 3kW LIM prototype. © 1986-2012 IEEE.

关键词： Low pass filters

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Improving the reliability of classical molecular dynamics simulations in battery electrolyte design

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Journal of Energy Chemistry 2025年第2期101卷 34-41,I0002页

作者： Xin He Yujie Zhang Haomiao Li Min Zhou Wei Wang Ruxing Wang Kai Jiang Kangli Wang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology College of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan 430074HubeiChina Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of TechnologyWuhan 430068HubeiChina

Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.

关键词： Electrolyte Classical molecular dynamics Solvation structure Simulations

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Distribution network gray-start and emergency recovery strategy with pumped storage unit under a typhoon

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Global Energy Interconnection 2025年第1期8卷 121-133页

作者： Zhenguo Wang Hui Hou Chao Liu Shaohua Wang Zhengtian Li Xiangning Lin Te Li Research Institute of State Grid Zhejiang Electric Power Company Hangzhou 310014PR China School of Automation Wuhan University of TechnologyWuhan 430070PR China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074PR China

Typhoons can cause large-area blackouts or partial outages of distribution *** define a partial outage state in the distribution network as a gray state and propose a gray-start strategy and two-stage distribution network emergency recovery framework.A phase-space reconstruction and stacked integrated model for predicting wind and photovoltaic generation during typhoon disasters is proposed in the first *** provides guidance for second-stage post-disaster emergency recovery *** emergency recovery scheduling model is established in the second stage,and this model is supported by a thermal power-generating unit,mobile emergency generators,and distributed *** generation includes wind power generation,photovoltaics,fuel cells,***,we con-sider the gray-start based on the pumped storage unit to be an important first step in the emergency recovery *** model is val-idated on the improved IEEE 33 node system,which utilizes data from the 2022 super typhoon“Muifa”in Zhoushan,Zhejiang,*** indicate the superiority of a gray start with a pumped storage unit and the proposed emergency recovery strategy.

关键词： Wind and photovoltaic generation prediction Pumped storage unit Gray-start Distribution network Emergency recovery strategy

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

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Chinese Physics B 2025年第2期34卷 90-95页

作者： Ziyu Li Tianyi Gu Wenqi Wei Yang Yuan Zhuo Wang Kangjian Luo Yupeng Pan Jianfeng Xie Shaozhe Zhang Tao Peng Lin Liu Qi Chen Xiaotao Han Yongkang Luo Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China

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 wire, which is a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques, i.e., 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 opportunity to test the availability of our newly-built ultrasound pulse-echo facility at the 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., in ultra-high magnetic field up to 50 T and nitrogen or helium cryogenic liquids.

关键词： high-field magnet Cu–Ag alloy ultrasonic techniques elastic constants

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Topology design and manufacturing of enhanced current-attenuating solid-state characteristic DC circuit breaker based on cascade structure

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Journal of Power Electronics 2025年 1-13页

作者： Ding, Can Ji, Yinbo Yuan, Zhao Shi, Yiji College of Electrical Engineering and New Energy China Three Gorges University Yichang China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Solid-state characteristic DC circuit breakers (SSDCCB) are crucial devices in ensuring the efficient and the stable operation of low-voltage DC (LVDC) distribution networks. A novel topology for grid applications is proposed in this paper, termed the Cascaded Attenuating current Solid-state characteristic DC Circuit Breaker (CASSCB), which is an enhancement based on traditional SSCBs. This innovation introduces the primary current-attenuating branch to the front end of the diversion branch, which is composed of sub-modules cascaded in series. The primary current-attenuating circuit, which is established by combining current-attenuating reactance with resistance in parallel, effectively curbs the second-stage rise rate and the peak value of incident currents, thereby mitigating the impact on the grid. In the sub-modules, cost-effective SCRs are strategically used in place of high-priced IGBTs for breaking and voltage division, leading to a significant reduction in overall costs. A thorough analysis of the topology principles of the CASSCB is conducted alongside theoretical derivations. In addition, methods are outlined for optimizing the selection of key component parameters. To further verify its performance, a validation model was established using MATlab/Simulink tools, and a small-scale experimental prototype is developed. Results affirm the feasibility and the effectiveness of the CASSCB topology. © The Author(s) under exclusive licence to The Korean Institute of Power Electronics 2025.

关键词： Timing circuits

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