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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Cong Xiong Caoyuan Wang Wei Ji Limin Xiao Advanced Fiber Devices and Systems Group Key Laboratory of Micro and Nano Photonic Structures (MoE) Key Laboratory for Information Science of Electromagnetic Waves (MoE) Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing School of Information Science and Technology Fudan Shanghai China

An ultracompact multicore fiber-tip sensor is proposed, designed, and experimentally demonstrated. The 3D printed multicore fiber-tip probes provide a highly sensitive and reliable scheme for discriminative measuremen...

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Ultra-thick Dry-process Cathode Design through Formula Optimization

Ultra-thick Dry-process Cathode Design through Formula Optim...

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2024 International Conference on Green Energy and Mechatronics engineering, ICGEME 2024

作者： Wang, Fengqian Du, Baoshuai Xu, Li Guan, Minyuan Lou, Ping Tang, Shun Cheng, Shijie Cao, Yuan-Cheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Grid Shandong Electric Power Research Institute Jinan250003 China Beijing Institute of Smart Energy Huairou Laboratory Changping District Beijing102209 China Huzhou Power Supply Company State Grid Zhejiang Electric Power Company Ltd. Huzhou313000 China

Lithium-ion batteries is an indispensable energy storage device in wind energy and solar energy grid-connected system. Solvent-free electrodes manufacturing processes as a new technology have attracted increasing scientific interest due to their cost reduction, ecological friendliness, and ability to increase electrode density. The coordination between the various components plays a crucial and pivotal role in shaping the physical and electrochemical performance of the electrode. In this research, through rational formulation optimization, it is possible to determine the optimal manufacturing parameters for improving performance, such as cycle stability and energy density. Improving battery performance can accelerate the spread of various applications, including electric vehicles and grid-scale energy storage. Studies have shown that when the conductive agent/binder is 5:2, the cycle stability and specific capacity of the battery is the best, under the condition of 0.5 C, even at a high load of 55.4 mg/cm2, it can still play 153.5 mAh /g specific capacity, and the capacity retention rate after 100 cycles is 82.0%. This will make the application of lithium batteries in wind and solar grid-connected systems more extensive and efficient. © Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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The High Efficiency Control Method of PMSMs Based on Gradient Descent Algorithm 4

The High Efficiency Control Method of PMSMs Based on Gradien...

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4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Chen, Hao Cheng, Cheng Shuai, Kang Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

Maximum efficiency per ampere(MEPA) strategy based on loss model of motor is the commonly used high efficient control algorithm for permanent magnet synchronous motors. It takes into account the minimization of copper loss and iron loss, so the efficiency is higher than that of maximum torque per ampere(MTPA) strategy. In order to solve the problem that the process is too complicated when the MEPA strategy is used to obtain the optimal current, the gradient descent algorithm is introduced, and the simulation results show that it has a good effect. © 2021 IEEE.

关键词： Permanent magnets

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A Method to Simplify the Markov Model of Protective Systems

A Method to Simplify the Markov Model of Protective Systems

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Xingzhu Wang Yongxin Chen Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Grid Center State Grid Hubei Electric Power Research Institute Wuhan China

The state space approach is a common method for conducting reliability assessment of protective systems. However, as more factors affecting the reliability of protective relay are considered, the system Markov model is becoming more and more complex and its solving efficiency is decreasing. To avoid this, a method to simplify the Markov model of protective system is proposed in this paper. Based on the continuous-time Markov process (CTMP), the theory underlying the state space approach, the method illustrates that the duration of the protective system in the switching states can be neglected. In other words, the protection switching state can be ignored when developing a Markov model of protective system. This method is applied to two existing models, one for a protection/component system and the other for redundant protective systems. The study results show that the method significantly reduces the complexity of the Markov model and improves the solving efficiency without reducing the capability of Markov model to describe the reliability of protective systems.

关键词： Protection switching Protective relaying Switches System integration Markov processes Reliability theory Complexity theory

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Medium and Long-Term Electricity Forecasting Method Based on Solow Model: A Case of Hubei Province 4

Medium and Long-Term Electricity Forecasting Method Based on...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Ling, Xu Yu, Haiyang Lou, Suhua Wang, Yuan Xi, Jianghui Ouyang, Litao Central China Branch of State Grid Corporation of China Wuhan China Huazhong University of Science and Technology China-EU Institute for Clean and Renewable Energy Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

Accurate electricity forecasting is very significant to power system. Modern smart grid has huge data and complex structure, and the nonlinear relationship between influencing factors and electricity demand is complex, random and changeable. Only by making full use of large amounts of data, accurate, stable and reliable medium and long-term electricity prediction can be made. Based on the traditional Solow Model, this paper proposes an Extended Solow Model by analyzing a lot of economic data and extracting key influencing factors. With the real load data of Hubei power grid, the experimental results show that the Extended Solow Model proposed by this paper can effectively improve the forecasting accuracy of 1.40% compared with the traditional Solow Model. © 2021 IEEE.

关键词： Forecasting

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Validation of the plasma-wall self-organization model for density limit in ECRH-assisted start-up of Ohmic discharges on J-TEXT

arXiv

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arXiv 2023年

作者： Liu, Jiaxing Zhu, Ping Escande, Dominique Franck Zhang, Junli Xia, Donghui Wang, Yuhan Wang, Jiaming Yang, Qinghu Fang, Jiangang Gao, Li Cheng, Zhifeng Chen, Zhipeng Yang, Zhoujun Chen, Zhongyong Ding, Yonghua Pan, Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Aix-Marseille Université CNRS PIIM UMR 7345 Marseille France

A recently developed plasma-wall self-organization (PWSO) model predicts a significantly enhanced density limit, which may be attainable in tokamaks with ECRH-assisted ohmic startup and sufficiently high initial neutral density. Experiments have been conducted on J-TEXT to validate such a density limit scenario based on this model. Experimental results demonstrate that increasing the pre-filled gas pressure or ECRH power during the startup phase can effectively enhance plasma purity and raise the density limit at the flat-top. Despite the dominant carbon fraction in the wall material, some discharges approach the edge of the density-free regime of the 1D model of PWSO. Copyright © 2023, The Authors. All rights reserved.

关键词： Electric discharges

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A Wideband Bidirectional Filtering Slot Antenna with Three Slots

A Wideband Bidirectional Filtering Slot Antenna with Three S...

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Antennas and Propagation & USNC/URSI National Radio Science Meeting

作者： Junyi Lyu Pengfei Lyu Yulu Hu Shenzhen Institute for Advanced Study UESTC Shenzhen P. R. China Ocean College Jiangsu University of Science and Technology Zhenjiang China National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China

ISBN: (数字)9798350369908

ISBN: (纸本)9798350369915

In this paper, a wideband bidirectional filtering slot antenna is proposed. Conventional slot antennas have narrow bandwidth and low frequency selectivity. First, the impedance bandwidth of the slot antenna is increased by using the shorting branch feedline. Second, two parasitic slots are introduced for electronic and magnetic coupling with the driven slot, with radiating nulls on each side of the passband to increase frequency selectivity. The proposed filtering slot antenna achieves $\vert S11\vert < -10dB$ within the 4.03GHZ-5.96GHZ(38.6%), an in-band gain of 3.91-5.78 dBi and an out-of-band radiation suppression more than 13.73 dB.

关键词： Slot antennas Filtering Magnetic separation Reflector antennas Broadband antennas Passband Impedance

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Modular Multilevel DC-DC Converter With Inherent Bipolar Operation Capability for Resilient Bipolar MVDC Grids

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CPSS Transactions on Power Electronics and Applications 2022年第1期7卷 37-48页

作者： Shanshan Zhao Yu Chen Shenghui Cui Jingxin Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology China Department of Electrical and Computer Engineering Seoul National University Korea Institute for Power Generation and Storage Systems E. ON Energy Research Center RWTH Aachen University Germany

Bipolar medium-voltage dc (MVDC) distribution systems are of great interests nowadays due to its high availability and reliability. A bipolar MVDC grid can be established by the installation of power-balancers or directly by converters with inherent bipolar operation capability to avoid the extra cost and volume. Therefore, this paper proposes a modular multilevel dc-dc converter (MMDC) with inherent bipolar operation capability for the interconnection of bipolar MVDC grids and LVDC girds. Considering that the MMDC is normally only capable of operating with monopole MVDC distribution systems due to the symmetric structure and operation scheme, a center-tapped high-frequency interface transformer is employed on the MV side of the MMDC. Based on the concept of the flux dc-bias cancellation, a dedicated operation method is proposed, whereby the power flows of the two MVDC poles can be regulated independently with a simple control scheme, and no penalty of increased current rating is imposed on the semiconductor devices or the interface transformer compared to the conventional MMDC with monopole operation. Additionally, the MMDC can realize single-pole operation in case one pole is faulty and deliver at least 50% of the rated power capacity, which significantly enhance the reliability and availability of the power delivery. The validity of the proposed bipolar operation scheme of the MMDC has been verified by both simulations and experiments with a down-scale prototype.

关键词： Multilevel converters Semiconductor devices Prototypes DC-DC power converters Transformers Valves Power electronics

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A Real- Time Self-Learning Control for Megahertz GaN-based DC-DC Converter

A Real- Time Self-Learning Control for Megahertz GaN-based D...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Jing Chen Yu Chen Yong Kang The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology (HUST) Hubei China

ISBN: (纸本)9781665448178

With the vigorous development of the wide bandgap power devices, the switching frequency of DC-DC converter is improved to MHz. But it leads to the problem that the high-performance but complicated adaptive control methods cannot be completed in such a short switching cycle. To solve it, this paper proposes a real-time self-learning control methodology, which can be implemented at MHz switching frequency by FPGA and its dynamic control performance can be real-time enhanced. A GaN-based buck converter prototype with 1 MHz switching frequency is built to demonstrate the feasibility of the proposed real-time self-learning control methodology.

关键词： Photonic band gap Switching frequency Heuristic algorithms Asia Switches Control systems Real-time systems

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Asymmetric-Structure Modification of Terahertz All-Dielectric Metamaterial for electromagnetically Induced Transparency Analogue with High-Quality Factor

Asymmetric-Structure Modification of Terahertz All-Dielectri...

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International Conference on Infrared and Millimeter Waves

作者： Yanqi Hu Liming Zhong Chi Zhang Guang Zeng Yongqian Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

An all-dielectric metamaterial (ADMM) based on asymmetric split-ring resonator (A-SRR) is proposed and numerically demonstrated in the terahertz range. The coupling between a bright mode supported by the silicon bars and a dark mode supported by the A-SRR leads to an analogue of electromagnetically induced transparency (EIT). By simply modifying the symmetric SRR into the asymmetric structure, the quality factor of the EIT peak can significantly increase from 255 to 1410, exhibiting a better slow-light performance. This work gives a new way to adjust the asymmetry of the ADMM for higher quality factor, which is useful for applications in slow-light devices and chemical/biological sensors.

关键词： Q-factor Performance evaluation Couplings Chemical sensors Millimeter wave devices Metamaterials Silicon

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