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International Conference on Electric Power and Energy Conversion Systems (EPECS)

作者： Diaa-Eldin A. Mansour Eatmad W. Nahas Hossam A. Abd el-Ghany Doaa M. Yehia Xiangning Lin Samir M. Dawoud Electrical Power and Machines Engineering Department Faculty of Engineering Tanta University Tanta Egypt Department of Electrical Power Engineering Faculty of Engineering Egypt-Japan University of Science and Technology Alexandria Egypt State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical Engineering College of Engineering and Information Technology Onaizah Colleges Qassim Saudi Arabia

ISBN: (数字)9798331516963

ISBN: (纸本)9798331516970

The fault current levels of DC microgrids are extremely high. For faults on the grid side, these high levels can cause fast tripping, thereby hindering the fault ride-through capability of the DC microgrid. Accordingly, this paper aims to use superconducting fault current limiter (SFCL) to limit fault current contribution from microgrid components to the grid side and enhance fault ride-through capability. The considered DC microgrid in the present study has a common DC bus with a bipolar structure. Photovoltaic (PV) arrays, wind energy systems, and Li-ion batteries are connected centrally to the DC bus. Two identical SFCL units were inserted between the DC bus and the main grid on the positive and negative poles. The microgrid performance under grid faults was investigated for different types of faults. The fault currents contributed by various microgrid components were analyzed without and with using SFCL. Also, the state of charge and rate of current rising for batteries were evaluated. SFCL succeeded in limiting the fault currents effectively and keeping safe operation for the microgrid components.

关键词： Wind energy Superconducting transmission lines Microgrids Power system stability Software Batteries Circuit faults state of charge Fault current limiters Fault currents

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Quantum dots assisted in vivo two-photon microscopy with NIR-Ⅱemission

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Photonics Research 2022年第1期10卷 189-196页

作者： HUWEI NI YALUN WANG TAO TANG WENBIN YU DONGYU LI MUBIN HE RUNZE CHEN MINGXI ZHANG JUN QIAN State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China SIEE(Sussex AI Institute) Zhejiang Gongshang UniversityHangzhou 310018China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

With the advantages of high resolution and deep penetration depth,two-photon excited NIR-Ⅱ(900–1880 nm)fluorescence(2PF)microscopic bioimaging is ***,due to the lack of imaging systems and suitable probes,few such works,to our best knowledge,were demonstrated utilizing NIR-II excitation and NIR-Ⅱfluorescence ***,we used aqueously dispersible Pb S/Cd S quantum dots with bright NIR-II fluorescence as the contrast *** the excitation of a 1550 nm femtosecond(fs)laser,they emitted bright 2 PF in the NIR-Ⅱ***,a 2PF lifetime imaging microscopic(2PFLIM)system was implemented,and in vivo 2PFLIM images of mouse brain blood vessels were obtained for the first time to our best *** improve imaging speed,an in vivo two-photon fluorescence microscopy(2 PFM)system based on an In Ga As camera was implemented,and in vivo 2PFM images of QDs-stained mouse brain blood vessels were obtained.

关键词： excitation photon system

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Concept and Definition of Dynamic Symmetrical Components with Time-Varying Amplitude and Frequency

Concept and Definition of Dynamic Symmetrical Components wit...

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IEEE General Meeting Power& Energy Society

作者： Yingbiao Li Jiabing Hu Weizhong Wen Qinghua Wang Shicong Ma Jianbo Guo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China China Electric Power Research Institute Beijing China

This paper investigates the dynamic symmetrical component method of internal voltage vector with time-varying amplitude and frequency. With the large-scale integration of power electronic devices into the power grid, when there is an asymmetrical fault in the AC network, the voltages and currents present the characteristics of amplitude and frequency time-varying modulation. Hence, the traditional asymmetrical fault analysis method and concept based on phasor models with constant amplitude and frequency are not adaptive enough. In order to supplement the traditional symmetrical component method and concept, the phasor models and vector models with time-varying amplitude and frequency are established. Then, the asymmetrical three-phase phasors with time-varying amplitude and frequency are decomposed into three groups of symmetrical phasors with time-varying amplitude and frequency. Based on the mathematical and physical characteristics of symmetrical components, the applicable concept and definition are reestablished. Lastly, time-domain simulations corroborate the theoretical analysis.

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Perfecting and extending the near-infrared imaging window

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Light(Science & Applications) 2021年第10期10卷 1949-1966页

作者： Zhe Feng Tao Tang Tianxiang Wu Xiaoming Yu Yuhuang Zhang Meng Wang Junyan Zheng Yanyun Ying Siyi Chen Jing Zhou Xiaoxiao Fan Dan Zhang Shengliang Li Mingxi Zhang Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310058 HangzhouChina Intelligent Optics&Photonics Research Center Jiaxing Institute of Zhejiang University314000 JiaxingZhejiang ProvinceChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina Key Laboratory of Reproductive Genetics(Ministry of Education) Department of Reproductive EndocrinologyWomen’s HospitalZhejiang University School of Medicine310006 HangzhouChina College of Pharmaceutical Sciences Soochow University215123 SuzhouChina

In vivo fluorescence imaging in the second near-infrared window(NIR-II)has been considered as a promising technique for visualizing ***,the definition of the NIR-II region and the mechanism accounting for the excellent performance still need to be ***,we simulate the photon propagation in the NIR region(to 2340 nm),confirm the positive contribution of moderate light absorption by water in intravital imaging and perfect the NIR-II window as 900–1880 nm,where 1400–1500 and 1700–1880 nm are defined as NIR-IIx and NIR-IIc regions,***,2080–2340 nm is newly proposed as the third near-infrared(NIR-III)window,which is believed to provide the best imaging *** wide-field fluorescence microscopy in the brain is performed around the NIRIIx region,with excellent optical sectioning strength and the largest imaging depth of intravital NIR-II fluorescence microscopy to *** also propose 1400 nm long-pass detection in off-peak NIR-II imaging whose performance exceeds that of NIR-IIb imaging,using bright fluorophores with short emission wavelength.

关键词： perfect Perfect fir

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Generation Method of Probabilistic Annual Output Scenario of New Energy Based on Electricity Characteristic Matching

Generation Method of Probabilistic Annual Output Scenario of...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Dajun Si Yuanyuan Zhao Lingfang Li Yixuan Chen Peng Sun Power Grid Planning and Construction Research Center Yunnan Power Grid Co. Ltd. Kunming China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The annual power generation scenario sequence of new energy is the basis of system operation simulation. A new energy probabilistic annual output scenario generation method based on electricity characteristic matching is proposed in this paper. Firstly, the power balance characteristics of historical new energy scenarios are described based on the characteristic index, and then the probabilistic annual generation utilization hour scenario is constructed based on k-means clustering algorithm. Finally, the multi-time-scale electricity distribution curve is matched based on the feature index extraction, and the probabilistic new energy annual output scenarios under different power generation levels are generated. The example is tested based on the historical new energy data of a provincial power grid in China, and the generated new energy sequence scenario is used to calculate the power balance capacity of the system. the results verify the effectiveness and practicability of the proposed method.

关键词： Electrical engineering Energy consumption Systems operation Clustering algorithms Markov processes Probabilistic logic Feature extraction

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Enhanced Dynamic Phase Stability and Suppressed Mn Dissolution in Low-Tortuosity Spinel LMO Electrode

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能源材料前沿（英文） 2023年第3期2023卷 193-201页

作者： Renjie He Sheng Lei Mengchuang Liu Mingsheng Qin Wei Zhong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Microspinel LiMn204(LMO)is a widely used cathode material in power lithium-ion ***,inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during ***,a low-tortuosity LMO(LMO-LT)electrode is fabricated by an ice-templating method,which exhibits enhanced dynamic phase stability,alleviated Mn dissolution,and rare particle microcracks during *** is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization,leading to uniform electrochemical reaction within microregions of the LMO-LT ***,the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO *** a result,the full cell[negative-to-positive capacity ratio(N/P)=1.1]with thick LMO-LT cathode(13 ***-2)and Li4Ti5O12 anode sustains 80.0％capacity over 200 *** LMO-LT electrode further delivers 78.9％capacity of that at 0.1 C at the high rate of 5 *** work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale,promoting the development of high-performance LMO electrodes.

关键词： stability electrode dynamic phase dissolution enhanced low-tortuosity spinel suppressed

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Inorganic Filler Enhanced Formation of Stable Inorganic-Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

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advanced Functional Materials 2023年第29期33卷 2301111-2301111页

作者： Guo, Chi Du, Kang Tao, Runming Guo, Yaqing Yao, Shuhao Wang, Jianxing Wang, Deyu Liang, Jiyuan Lu, Shih-Yuan Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan University Wuhan430056 China Department of Chemistry Institute for Advanced Materials and Manufacturing The University of Tennessee KnoxvilleTN37996 United States State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan

Lithium metal (LM) is a promising anode material for next generation lithium ion based electrochemical energy storage devices. Critical issues of unstable solid electrolyte interphases (SEIs) and dendrite growth however still impede its practical applications. Herein, a composite gel polymer electrolyte (GPE), formed through in situ polymerization of pentaerythritol tetraacrylate with fumed silica fillers, is developed to achieve high performance lithium metal batteries (LMBs). As evidenced theoretically and experimentally, the presence of SiO2 not only accelerates Li+ transport but also regulates Li+ solvation sheath structures, thus facilitating fast kinetics and formation of stable LiF-rich interphase and achieving uniform Li depositions to suppress Li dendrite growth. The composite GPE-based Li||Cu half-cells and Li||Li symmetrical cells display high Coulombic efficiency (CE) of 90.3% after 450 cycles and maintain stability over 960 h at 3 mA cm−2 and 3 mAh cm−2, respectively. In addition, Li||LiFePO4 full-cells with a LM anode of limited Li supply of 4 mAh cm−2 achieve capacity retention of 68.5% after 700 cycles at 0.5 C (1 C = 170 mA g−1). Especially, when further applied in anode-free LMBs, the carbon cloth||LiFePO4 full-cell exhibits excellent cycling stability with an average CE of 99.94% and capacity retention of 90.3% at the 160th cycle at 0.5 C. © 2023 Wiley-VCH GmbH.

关键词： Lithium compounds

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

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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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A general coordination scheme for zero-sequence current differential protection on series-compensated multi-circuit line 4

A general coordination scheme for zero-sequence current diff...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Huang, Zongchao Li, Yinhong Huazhong University of Science Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728196060

The present study of zero-sequence current differential protection (ZCDP) with series compensation has not considered the equivalent impedance characteristic of series compensation, and meanwhile cannot put forward a universal coordination scheme feasible for multi-circuit lines. In this paper, the equivalent impedance characteristic of the series capacitor (SC) device and the effect of SC on the operating characteristics of ZCDP under single-circuit and multi-circuit conditions are analyzed. Based on the analysis, a general coordination scheme for ZCDP on series-compensated multi-circuit line is proposed, of which the presented sensitivity coefficient is able to reflect the sensitivity of current differential protection. A power grid experiment is used to demonstrate the correctness of the analysis and the effectiveness of the proposed scheme. © 2020 IEEE.

关键词： Timing circuits

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A coil optimization design of the horn shape for underwater wireless power transfer 16

A coil optimization design of the horn shape for underwater ...

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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Zeng, Yingqin Rong, Cancan Lu, Conghui Liu, Xiaobo Liu, Minghai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839533914

In the application scenarios of underwater wireless power transfer (WPT), a horn shape coil is proposed in this paper. Aiming to obtain the uniform magnetic field in a specific area, the horn shape coil is optimized by reasonably setting the tilt angle and the spacing of the turns. Moreover, the horn coil with optimal tilt angle and the horn coil with uneven spacing are designed. Considering the eddy current loss in seawater, the model of WPT system in seawater is established using the 3D electromagnetic simulator. Through simulation and analysis of eddy current loss under different conditions, the influence of eddy current loss on efficiency is illustrated. Finally, the transfer efficiency and output power are obtained by simulation and calculation. Also, the performance of the designed system is evaluated. It is found that the proposed system can effectively enhance the stability and anti-offset capability of WPT system, and then obtain the stable and efficient output. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Seawater

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