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12th Asia-Pacific International Conference on Lightning, APL 2023

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

ISBN: (纸本)9781665456852

It is well known that the negative leader in the air develops in a stepwise manner, with each step originating from a space stem. However, the formation mechanism of a space stem remains unknown, leading to a blockage in the study on negative leader discharge. One of the main reasons is the lack of observations of space stems. For this reason, and as a continuation of our work, this paper focuses on the initiation location of the space stems. We have designed experimental conditions to enable space stem observation using a high-speed camera. Through processing the experimental images, it is found that the location where the space stems start to be formed may be located at the boundary of the previous corona streamer discharge, or inside the pre-corona streamer region, but at the edge of the intense discharge area. These findings may help to further Figure out the formation mechanism of a space stem in long negative sparks in the air. © 2023 IEEE.

关键词： Location

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Synergy of I-Cl co-occupation on halogen-rich argyrodites and resultant dual-layer interface for advanced all-solid-state Li metal batteries

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Journal of Energy Chemistry 2023年第11期86卷 499-509,I0011页

作者： Han Yan Ruifeng Song Ruonan Xu Shulin Li Qiaoquan Lin Xinlin Yan Zhenyu Wang Chuang Yu Long Zhang Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004HebeiChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117FujianChina Institute of Solid State Physics Vienna University of TechnologyWiedner Hauptstr.8–101040 ViennaAustria Guilin Electrical Equipment Scientific Research Institute Co.Ltd. Guilin 541004GuangxiChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000HubeiChina

The(electro)chemical stability and Li dendrite suppression capability of sulfide solid electrolytes(SEs)need further improvement for developing all-solid-state Li batteries(ASSLBs).Here,we report advanced halogen-rich argyrodites via I and Cl co-occupation on the crystal ***,a proper I content forms a single phase,whereas an excessive I causes precipitation of two argyrodite phases like a superlattice *** resultant synergistic effect of the optimized composition allows to gain high ionic conductivities at room temperature and-20℃,and enhances the(electro)chemical stability against Li and Li dendrite suppression *** Li|argyrodite interface is very sensitive to the ratio of I and Cl.A LiCl-and LiI-rich double-layer interface is observed from the cell using the SE with optimized composition,whereas too high I content forms only a single interface layer with a mixture of Lil and *** double-layer interface is found to effectively mitigate the Li/SE *** proper designed argyrodite enables ASSLBs to achieve good electrochemical properties at a broad temperature range regardless of the electrode *** co-occupation strategy provides a novel exploration for advanced halogen-rich argyrodite system.

关键词： Sulfide solid electrolytes Argyrodites Dual doping Li metal anode Solid-state batteries

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Effect of Inverter-type Distributed Power Supply Access on the Zero Sequence Current Distribution of AC Lines

Effect of Inverter-type Distributed Power Supply Access on t...

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2023 International Conference on Power Energy Systems and Applications, ICoPESA 2023

作者： Qian, Zhengxu Pan, Wulue Ma, Ruizhi Xu, Feng Cao, Wenbin Zhang, Zanzan Xu, Zhile Wen, Minghao Research Institute State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345605

For the Inverter-Interfaced Distributed Generator (IIDG) access system, a ground fault occurred on the 110 kV contact line, and the zero-sequence current distribution on both sides of the line was analyzed by combining the characteristics of the controlled current source of the IIDG after the fault, the relationship between the sequence quantities, the neutral grounding method of the transformer and the access capacity of the IIDG. Factors. The analysis points out that the IIDG access side transformer neutral grounding mode determines the zero sequences current distribution on both sides of the line;when the system side circuit breaker is disconnected, the IIDG access capacity mainly affects the zero sequences current distribution, and the local load power level has a small effect on the zero sequence current distribution. The correctness of the theoretical analysis is verified by PSCAD/EMTDC software simulation. © 2023 IEEE.

关键词： Electric circuit breakers

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Overview of machine learning applications in fusion plasma experiments on J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 27-38页

作者： Wei ZHENG Fengming XUE Chengshuo SHEN Yu ZHONG Xinkun AI Zhongyong CHEN Yonghua DING Ming ZHANG Zhoujun YANG Nengchao WANG Zhichao ZHANG Jiaolong DONG Chouyao TANG Yuan PAN International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Institute of Artificial Intelligence Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

Machine learning research and applications in fusion plasma experiments are one of the main subjects on *** 2013,various kinds of traditional machine learning,as well as deep learning methods have been applied to fusion plasma *** applications in the real-time experimental environment have proved the feasibility and effectiveness of the *** disruption prediction,we started by predicting disruptions of limited classes with a short warning time that could not meet the requirements of the mitigation *** years of study,nowadays disruption prediction methods on J-TEXT are able to predict all kinds of disruptions with a high success rate and long enough warning ***,cross-device disruption prediction methods have obtained promising *** analysis of the models are *** diagnostics data processing,efforts have been made to reduce manual work in processing and to increase the robustness of the diagnostic *** based on both traditional machine learning and deep learning have been applied to real-time experimental *** models have been cooperating with the plasma control system and other systems,to make joint decisions to further support the experiments.

关键词： machine learning disruption prediction diagnostics data processing J-TEXT

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Vibration Suppression of Active Magnetic Bearing System with Precise Frequency Estimation Method

Vibration Suppression of Active Magnetic Bearing System with...

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2022 International Conference on Electrical Machines, ICEM 2022

作者： Xu, Hongwei Li, Jian Yang, Kai Lu, Yang Zhang, Pengfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

In the active magnetic bearing systems (AMB), synchronous vibration of rotor is an inherent phenomenon due to the inevitable mass unbalance problem. This paper proposes an active vibration control method with precise frequency estimation for synchronous vibration suppression. Firstly, a universal control model with mass eccentricity is established and analyzed. Then, a frequency estimation strategy based on phase-locked loop (PLL) method is proposed to detect the frequency information precisely without any hardware costs. Besides, the stability of the whole system is strictly proved through the eigenvalues analysis of the characteristic equation. Furthermore, a zero-displacement vibration control method is proposed based on coordinate transformation method (CTM), which achieves high-precision detection of the synchronous component of radial displacement. And the related simulation results show that the synchronous vibration of rotor can be eliminated completely and rapidly with the proposed strategy, which agrees with the theoretical analysis. © 2022 IEEE.

关键词： Frequency estimation

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A Novel Protection Scheme for Outgoing Line Fault of AC Transmission Line near the Inverter Station of AC/DC Hybrid Power Grid based on AC Filter Characteristics

A Novel Protection Scheme for Outgoing Line Fault of AC Tran...

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2022 International Conference on Green Energy and Power Systems, ICGEPS 2022

作者： Yang, Lin Wen, Minghao Chen, Yu Wang, Xingzhu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Compared with traditional AC power grid, the fault characteristics of the AC/DC hybrid power grid are more complex and variable. Hence there is a problem of incorrect action for the fault detection elements used in traditional AC power grid which comes up when an outgoing line fault occurs on the AC transmission line in the vicinity of the inverter station. To distinguish the fault direction under the aforementioned situation, a directional protection scheme based on the characteristics of the AC filter is proposed in this paper. Considering the information can be measured by AC line relay, a method for estimating the current provided by the AC filter is given during an outgoing line fault. According to the difference of current characteristics between forward and reverse fault, the fault direction can be judged based on waveform similarity among the currents provided by the AC filter and measured by the AC line relay. Finally, a simulation model is built on the PSCAD/EMTDC platform for extensive performance evaluation. The reliability and effectiveness of the protection scheme are verified under different cases. © Published under licence by IOP Publishing Ltd.

关键词： Fault detection

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An Improved Bidirectional Variable Structure LLC Resonant Converter 3

An Improved Bidirectional Variable Structure LLC Resonant Co...

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

作者： Zhou, Xinheng Chen, Changsong Xu, Zhiwen Ni, Kang Yang, Tianhao Zhang, Jingyue 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

With the development of electric vehicles, LLC converter for bidirectional energy transmission has received more and more attention. In order to achieve bidirectional boost operation, the L-LLC converter is applied. However, the forward operation efficiency of L-LLC converter is reduced compared to the traditional LLC converter due to the addition of an extra inductor. This paper proposes an improved bidirectional variable structure LLC (VS-LLC) resonant converter to improve forward operation efficiency. Compared with L-LLC converter, the VS-LLC converter improves the efficiency in forward mode by changing the resonant network. The working principle of the proposed converter is introduced, and the parameters of a VS-LLC converter are optimized. Bidirectional boost operation and soft switching capabilities of VS-LLC converter are validated by the simulation results. The comparison results show that VS-LLC converter has higher efficiency than L-LLC converter in forward mode, and the backward operation efficiency of two converters is approximate. © 2022 IEEE.

关键词： Vehicle transmissions

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Research on Hybrid Modulation Strategy of Bidirectional LLC Resonant Converter in Distributed Energy Storage System 3

Research on Hybrid Modulation Strategy of Bidirectional LLC ...

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

作者： Luo, Senwen Liu, Wanjun Peng, Te Wang, Yadong Duan, Shanxu 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

In order to increase the input and output voltage range of the energy storage system, this paper will conduct in-depth research on the modulation strategy of the bidirectional DC/DC module of the energy storage system. In this paper, the LLC resonant converter with bidirectional operation is used as the connection port between the battery and the DC bus in the energy storage system. The working principle of this topology and the commonly used modulation strategies are briefly described, and then the hybrid modulation strategy is analyzed in detail, which can ensure the normal operation of the DC bus voltage in the range of 310V to 380V. The correctness and effectiveness of the strategy are verified by experiments. © 2022 IEEE.

关键词： Energy storage

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Mo_(2)C催化的低压纳米Li_(2)C_(2)O_(4)预锂化用于高能量锂离子电池

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Science China Materials 2023年第3期66卷 903-912页

作者：钟伟张策李思吾张薇曾子琪程时杰谢佳 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿... 详细信息

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿材料已显示出巨大的潜力.然而低电化学活性和高分解电位严重阻碍了其实际应用.本文中,我们报道了一种低压预锂化技术.通过配合使用Mo_(2)C催化剂和纳米Li_(2)C_(2)O_(4)Mo_(2)C催化剂改变了Li_(2)C_(2)O_(4)周围的电子云分布,大大降低了活化能,从而显著加速了锂从Li_(2)C_(2)O_(4)中的释放.通过冷冻干燥制备的纳米Li_(2)C_(2)O_(4)与Mo_(2)C催化剂形成良好接触并展现出快速的离子和电子传导.得益于这种协同效应,Li_(2)C_(2)O_(4)的分解电位降低了0.5 V,分解效率接近100%.纳米Li_(2)C_(2)O_(4)/Mo_(2)C复合材料补偿的LiCoO_(2)||SiO全电池展现出可以高于对照组46.9%的比容量,显示出巨大的实际应用潜力.

关键词：锂离子电池理论容量预锂化电化学活性分解电位全电池电子传导能量密度

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Method to Detect Arc Across Pantograph-Catenary Structure Atop Train Based on Frequency Features of Entry Current 1

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6th International Conference on Electrical engineering and Information Technologies for Rail Transportation, EITRT 2023

作者： Du, Yufei Jiao, Yang Zhu, Yongzheng Chen, Jun Li, Hongbin Chen, Qing Institute of Artificial Intelligence Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronics Engineering 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)9789819993192

ISBN: (纸本)9789819993185

During a train running at speed, the pantograph-catenary structure atop the train would be influenced by many factors, resulting in disconnections. A timely detection on arcs across this structure helps to guide works on real-time operating and later maintenance, to eliminate latent factors of disconnection. A theory on the generation of arcs is researched, simulated, and verified with practical data. Two features of entry current, in frequency bands at kHz degree and at harmonic-Hz degree, are picked for the detection. Based on the discrepancy on these bands while arcing and normally running, a model of support vector machine (SVM) is constructed. Existing signals on train are processed and rearranged to be datasets for training SVM. After applying it to a practical railway, the results illustrate: the accuracy on arc detections is up to 99.96%. With guidance from results, an on-site investigation was launched, and mark of flaming was found at corresponding location of catenary, which verified the correctness. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Pantographs

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