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arXiv 2024年

作者： Zhang, Jian Zhu, Ping Hegna, Chris C. State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States

A hybrid spectral/finite-element code is developed to numerically solve the resistive finite-pressure magnetohydrodynamic equilibria without the necessity of postulating nested magnetic flux surfaces in the non-axisymmetric toroidal systems. The adopted approach integrates a hyperbolic parallel damping equation for pressure updating, along with a dynamic resistive relaxation for magnetic field. To address the nonaxisymmetry in toroidal geometry, a pseudo flux mapping is employed to relate the axisymmetric computational domain to the physical domain. On the computational mesh, an isoparametric C1-continuous triangular element is utilized to discretize the poloidal plane, which is complemented with a Fourier decomposition in the toroidal direction. The versatility of the code is demonstrated through its application to several different non-axisymmetric toroidal systems, including the inherently three-dimensional equilibria in stellarators, the helical-core equilibrium states in tokamak plasmas, and the quasi-single-helicity states in a reversed-field pinch. © 2024, CC BY.

关键词： Stellarators

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Enhancement of Hydrogen Production Via Optimizing Micro-Structures of Electrolyzer on a Microfluidic Platform

SSRN

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SSRN 2023年

作者： Dong, Tianshu Duan, Xiudong Huang, Yuanyuan Huang, Danji Luo, Yingdong Liu, Ziyu Ai, Xiaomeng Fang, Jiakun Song, Chaolong School of Mechanical Engineering and Electronic Information China University of Geosciences Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Electrochemical water splitting plays a vital role for production of hydrogen (H2). Enhancing the rate of hydrogen separation from the electrode is crucial for improving the performance of water electrolyzers. The water electrolyzers often encounter issues such as air bubble adhesion to the electrode plate, leading to increased electrical resistance, reduced current density, and thus lower hydrogen generation rates. In addition, the compact configuration of electrolyzer and non-transparent electrode plates make it impracticable to observe and analyze the gas-liquid two-phase flow between the anode and cathode plates. Hence, a methodology is in high demand to experimentally investigate the two-phase flow within the electrolyzer, which could be further used to guide the design and optimization of the electrolyzer. In this work, we propose to utilize a microfluidic system as a phantom of electrolyzer. The transparent material of the microfluidic chip allows optical inspection and measurement of the two-phase flow. Specifically, we propose to optimize the two-phase flow by manipulating the micro-structure of the flow, which has been theoretically and experimentally demonstrated to effectively remove the gas bubbles attached to the wall and consequently enhance the hydrogen production rate. In conclusion, the dimensions of the proposed micro-structures can be potentially extended and applied to industrial electrolyzers according to the principle of similarity. © 2023, The Authors. All rights reserved.

关键词： Hydrogen production

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Study of the fast electron behavior in electron cyclotron current driven plasma on J-TEXT

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Plasma Science and technology 2022年第6期24卷 45-52页

作者： Xiaobo ZHANG Wei YAN Zhongyong CHEN Jiangang FANG Junli ZHANG You LI Xixuan CHEN Yunong WEI Ruihai TONG Zhifang LIN Yu ZHONG Lingke MOU Feng LI Weikang ZHANG Lu WANG Donghui XIA Zhonghe JIANG Zhoujun YANG Nengchao WANG Zhipeng CHEN Yonghua DING Yunfeng LIANG Yan PAN the J-TEXT Team 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 Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikD-52425 JülichGermany

In J-TEXT tokamak,fast electron bremsstrahlung diagnostic with 9 chords equipped with multichannel analyzer enables detailed studies of the generation and transport of fast *** spatial profiles and energy spectrum of the fast electrons have been measured in two ECCD cases with either on-axis or off-axis injection,and the profiles processed by Abel-inversion are consistent with the calculated power deposition ***,it is observed that the energy of fast electrons increases rapidly after turning off the ECCD,which may be attributed to the acceleration by the recovered loop voltage at low electron density.

关键词： fast electron tokamak electron cyclotron current drive power deposition location

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Research on the Cost Allocation Mechanism of Thermal Power in the New Power System Under the Electricity-Carbon Linkage

Research on the Cost Allocation Mechanism of Thermal Power i...

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Green Energy and Power Systems (ICGEPS), International Conference on

作者： Bin Chen Xinyu Wang Yi Du Ruijie Chen Rong Ye Suhua Lou State Grid Corporation of China Institute of Economic and Technology of State Grid Fujian Electric Power Co. Ltd Fuzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331510329

ISBN: (纸本)9798331510336

Driven by the global carbon neutrality target, the low-carbon transformation of power system and the synergy of carbon markets have emerged as critical issues. This study focuses on the value reconstruction and cost-sharing optimization of thermal power in the coupled electricity-carbon multi-market environment. It quantitatively analyzes the evolution of thermal power revenue structures and carbon cost transmission paths by constructing a multi-case simulation model based on three cases: the baseline case, the carbon pricing case, and the synergistic optimization case.

关键词： Couplings Costs Carbon dioxide Pricing Electricity supply industry Power systems Thermal analysis Resource management Carbon Optimization

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J-TEXT achievements in turbulence and transport in support of future device/reactor

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Plasma Science and technology 2024年第11期26卷 1-21页

作者： Zhipeng CHEN Zhangsheng HUANG Min JIANG Ting LONG Lu WANG Weixin GUO Zhoujun YANG Hai LIU Tao LAN Kaijun ZHAO Yuhong XU Rui KE Youwen SUN Hanhui LI Wen HE Ge ZHUANG Yuejiang SHI Wulyu ZHONG Yonghua DING Yunfeng LIANG Wenjing TIAN Xin XU Guodong ZHANG M.S.HUSSAIN Patrick H.DIAMOND State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’s Republic of China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China College of Electrical Engineering&New Energy China Three Gorges UniversityYichang 443002People’s Republic of China Department of Engineering and Applied Physics School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026People’s Republic of China ENN Science and Technology Development Co.Ltd. and Hebei Key Laboratory of Compact FusionLangfang 065001People’s Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Tsinghua University Beijing 100084People’s Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China Center for Astrophysics and Space Sciences University of California San DiegoLa Jolla CA 92093United States of America

Following the reconstruction of the TEXT tokamak at Huazhong University of Science and technology in China, renamed as J-TEXT, a plethora of experimental and theoretical investigations has been conducted to elucidate the intricacies of turbulent transport within the tokamak configuration. These endeavors encompass not only the J-TEXT device's experimental advancements but also delve into critical issues pertinent to the optimization of future fusion devices and reactors. The research includes topics on the suppression of turbulence, flow drive and damping, density limit, non-local transport, intrinsic toroidal flow, turbulence and flow with magnetic islands, turbulent transport in the stochastic layer, and turbulence and zonal flow with energetic particles or helium ash. Several important achievements have been made in the last few years, which will be further elaborated upon in this comprehensive review.

关键词： J-TEXT tokamak turbulence transport flow

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High-performance polarization management devices based on thin-film lithium niobate

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Light(Science & Applications) 2022年第5期11卷 868-876页

作者： Zhongjin Lin Yanmei Lin Hao Li Mengyue Xu Mingbo He Wei Ke Heyun Tan Ya Han Zhaohui Li Dawei Wang X.Steve Yao Songnian Fu Siyuan Yu Xinlun Cai State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen University510275 GuangzhouChina Department of Electrical and Computer Engineering The University of British ColumbiaVancouverBC V6T 1Z4Canada Photonics Information Innovation Center and Hebei Provincial Center for Optical Sensing Innovations College of Physics Science and TechnologyHebei University071002 BaodingChina Institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of Technology510006 GuangzhouChina

High-speed polarization management is highly desirable for many applications,such as remote sensing,telecommunication,and medical ***,most of the approaches for polarization management rely on bulky optical components that are slow to respond,cumbersome to use,and sometimes with high drive ***,we overcome these limitations by harnessing photonic integrated circuits based on thin-film lithium niobate *** successfully realize a portfolio of thin-film lithium niobate devices for essential polarization management functionalities,including arbitrary polarization generation,fast polarization measurement,polarization scrambling,and automatic polarization *** present devices feature ultra-fast control speeds,low drive voltages,low optical losses and compact *** these devices,we achieve high fidelity polarization generation with a polarization extinction ratio up to 41.9 dB and fast polarization scrambling with a scrambling rate up to 65 Mrad s−1,both of which are best results in integrated *** also demonstrate the endless polarization state tracking operation in our *** demonstrated devices unlock a drastically new level of performance and scales in polarization management devices,leading to a paradigm shift in polarization management.

关键词： polarization lithium film

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Method for Obtaining Leakage Inductance Based on Current Coupling in Unsaturated Zone 2

Method for Obtaining Leakage Inductance Based on Current Cou...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： Cao, Wenbin Qi, Xuanwei Wang, Song Huang, Xiaoming Chen, Ming Yin, Xianggen State Grid Zhejiang Electrical Power Research Institute Hangzhou310014 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781665400640

The accurate leakage inductance value of the transformer primary and secondary side leakage inductance is the key to the theoretical and simulation analysis of the transformer inrush current transient characteristics. First, the transformer differential equation is deduced, and two calculation expressions for solving leakage inductance under system balance and unbalance are obtained. Aiming at the scenario where the circular current of the delta winding cannot be measured, a parameter acquisition method based on current coupling characteristics in unsaturated zone is proposed. This method takes advantage of the mutual coupling between the circular current of the delta winding and the non-saturated phase current of the primary side. First judge the unsaturated phase, and then use the opposite of the unsaturated phase current instead of the circulating current to solve the quasi-leakage inductance under the two expressions. The quasi-leakage inductance values in the unsaturated zone are almost equal, and the average value in this zone is used as the calculated value. Simulation data and field record data verify the effectiveness of the method. © 2021 IEEE.

关键词： Differential equations

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Design and Analysis of Segmented Dipole Coil for Scalable Wireless Power Transfer to Multiple Devices 2

Design and Analysis of Segmented Dipole Coil for Scalable Wi...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： He, Xiangrui Rong, Cancan Lu, Conghui Zeng, Yingqin Liu, Xiaobo Liu, Renzhe Liu, Minghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430000 China China University of Mining and Technology School of Electrical and Power Engineering Xuzhou221116 China

ISBN: (纸本)9781665400640

This paper proposed a novel dipole coil using segmented windings for wireless power transfer (WPT) system with four receivers. The most attractive feature is that the couplings between transmitter and the receivers can be enhanced under the premise of lower core saturation with segmented dipole coil (SDC). Mistuning issues caused by the utilization of ferrite core are modeled and analyzed in detail. Furthermore, an optimized SDC is proposed to homogenize the magnetic field density in ferrite core. Thus, the proposed structure shares the same core saturation with dipole coil using evenly distributed windings but possesses a 30.7% more coupling strength. Eventually, an experimental prototype compensated by LCC-S topology is established. The maximum overall efficiency of four loads reaches 48% when the distance-to-diameter ratio equals to 1. The proposal of novel SDC structure can provide a significant guideline for numerous charging scenarios, such as multiple sensors or robot swarms. © 2021 IEEE.

关键词： Winding

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Using Deep Reinforcement Learning in Optimal Energy Management for Residential House Aggregators with Uncertain User Behaviors

Using Deep Reinforcement Learning in Optimal Energy Manageme...

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IEEE Student Conference on Electric Machines and Systems

作者： Yujun Lin Linfang Yan Hongxun Hui Yin Chen Xia Chen Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid (Suzhou) City & Energy Research Institute Suzhou China Department of Electrical and Computer Engineering State Key Laboratory of Internet of Things for Smart City University of Macau Macau China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow U.K.

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

In this study, the home energy management problem, which can be regarded as a high-dimensional optimization problem, for numerous residential houses, is addressed. The concept of the aggregator is utilized to reduce the state and action space and to handle the high dimensionality. A two-stage deep reinforcement learning (DRL)-based approach is proposed for the aggregators to track the schedule from a superior grid and guarantee the operation constraints. In the first stage, a DRL control agent is set to learn the optimal scheduling strategy interacting with the environment based on the soft-actor-critic framework and generate the aggregate control actions. In the second stage, the aggregate control actions are disaggregated to individual appliances considering the users' behaviors. The uncertainty of an electric vehicle's charging demand is quantitatively expressed based on the driver's experience. An aggregate anxiety concept is introduced to characterize the driver's anxiety on the electric vehicle's range and uncertain events. Finally, simulations are conducted to verify the effectiveness of the proposed approach under dynamic user behaviors, and comparisons show the superiority of the proposed approach over other benchmark methods.

关键词： Schedules Uncertainty Aggregates Anxiety disorders Optimal scheduling Deep reinforcement learning Electric vehicle charging Temperature control Vehicle dynamics Resistance heating

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Magnetic Welding of Large-Diameter Aluminum-Steel Dissimilar Metal Tubes: Actuator Design, Welding Process and Mechanism

SSRN

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SSRN 2023年

作者： Li, Xiaoxiang Liu, Haixiang Tang, Xinyu Tang, Yinghao Lai, Zhipeng Han, Xiaotao Cao, Quanliang Li, Liang Wuhan National High Magnetic Field Center 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

Magnetic pulse welding (MPW) belongs to the category of high-speed welding technology that shows unique advantages and broad application prospects in welding of dissimilar metals. However, this technology faces bottlenecks of limited processing scale and difficulty in improving welding quality, which restrict its application and development. This is because welding tubes with large diameters places strict requirements on the welding tools, and the relationship between the performance of welded joints and welding process parameters is unclear. To solve these issues, the fiber reinforcement layer technology and a field shaper (FS) with a multi-turn winding structure are introduced to develop a magnetic actuator with high mechanical strength and good heat dissipation performance. The influences of multiple parameters on welding quality were revealed through systematic welding experiments and mechanical tests. The results show that the 6061-O aluminum alloy tubes with diameter of 110 mm and thickness of 3 mm achieve high quality welding with 304 stainless steel tubes. Importantly, the voltage-gap and velocity-angle welding quality windows are built up by combining the experimental and numerical methods. The voltage-gap welding window indicates that moderately increasing the tube gap and discharge voltage are conducive to improve the welding quality. Besides, the relationship among the impact velocity, angle, and bonding strength is provided by velocity-angle welding window. Meanwhile, the simulations of welding interface formation and metallographic observation methods are presented to further investigate the welding effect and reveal the dynamic behavior under different welding conditions. The presented results are of great significance to understanding the MPW process and expanding its practical applications. © 2023, The Authors. All rights reserved.

关键词： Numerical methods

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