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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Qi Liu Jing Shi Jiachen Zhou Siwei Cheng Qi Cheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

LIQHYSMES (Liquid hydrogen with superconducting magnetic energy storage) offers rapid response, substantial capacity, and low energy conversion losses, making it ideal for large scale renewable energy integration and power grid stability. However, challenges remain in fully coordinated utilization of the storage units and safe, stable operation of the storage magnets. Accurate state prediction and control are vital for the efficient operation and coordination of LIQHYSMES. This paper proposes a state prediction based LIQHYSMES coordinated control strategy. Firstly, a superconducting magnet state prediction model based on the random forest algorithm is established. Secondly, the coordinated control strategy is outlined. Finally, simulation analysis validates the prediction model and control strategy, demonstrating their accuracy and effectiveness.

关键词： Renewable energy sources Accuracy Hydrogen Superconducting transmission lines Magnetic liquids Predictive models Superconducting magnets Prediction algorithms Stability analysis Superconducting magnetic energy storage

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Numerical simulation of dynamics behavior of pulsed-DC helium plasma jet confined by parallel magnetic field at atmospheric pressure

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Physical Review Research 2024年第3期6卷 033028-033028页

作者： Yinghua Liu Peiqi Yin Boping Xu Dawei Liu Liangwen Pi Yuxi Fu Yishan Wang Wei Zhao Jie Tang State Key Laboratory of Transient Optics and Photonics Beijing 100049 People's Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Center for Attosecond Science and Technology

A two-dimensional axisymmetric fluid model is used to simulate the dynamics behavior of an atmospheric-pressure helium plasma jet in the presence of a parallel magnetic field. The plasma jet is generated in a coaxial dielectric barrier discharge (DBD) driven by pulsed direct-current voltage. Comparative analysis of the plasma jet with and without the parallel magnetic field indicates that a slightly thinner plasma sheath inside the tube is present with the parallel magnetic field as a result of the decreased accumulated electrons on the inner surface of dielectric tube. After the streamer propagates outside the tube, a little more concentrated electron distribution in the annular wall is observed by applying the magnetic field because of the reduced electron diffusion in the radial direction and the confinement effect of the magnetic field on the electrons in the avalanche heads. The tiny reduction in the length of plasma jet is attributed to the E × B drift of charged particles. These results demonstrate that the parallel magnetic field has no apparent effect on the propagation of the plasma jet, and it contributes little to the performance improvement of the coaxial DBD, which agrees well with the previous experimental observations. This little impact of the parallel magnetic field on the coaxial DBD plasma jet may result from negligible contribution of the memory effect to the sole discharge pulse as well as the weak confinement effect of the applied magnetic field on the surface electrons that moves along the magnetic field lines under electrostatic repulsion.

关键词： Plasma discharges Low-temperature plasma

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Synthetic optimization and application of Li-argyrodite Li6PS5I in solid-state battery at different temperatures

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Rare Metals 2022年第3期41卷 798-805页

作者： Zhen-Yuan He Zi-Qi Zhang Ming Yu Chuang Yu Hao-Tian Ren Jun-Zhao Zhang Lin-Feng Peng Long Zhang Shi-Jie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China

Lithium argyrodite electrolytes (Li_(6)PS_(5)X (X=Cl, Br, I))have received tremendous attention due to their low cost and high conductivity among sulfide electrolytes. However,the synthesis details and application of ... 详细信息

关键词： battery application optimization

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Semitransparent organic photovoltaics enabled by transparent p-type inorganic semiconductor and near-infrared acceptor

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Journal of Energy Chemistry 2024年第9期96卷 351-358页

作者： Xue Yan Jiayu Wang Wei He Top Archie Dela Peña Can Zhu Hailin Yu Yingyue Hu Cenqi Yan Shengqiang Ren Xingyu Chen Zhe Wang Jiaying Wu Mingjie Li Jianlong Xia Lei Meng Shirong Lu Dewei Zhao Mikhail Artemyev Yongfang Li Pei Cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong 999077China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina Department of Material Science and Technology Taizhou UniversityTaizhou 318000ZhejiangChina Advanced Materials Thrust Function HubThe Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400GuangdongChina State Key Laboratory of Advanced Technology for Materials Science and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070HubeiChina Department of Civil1nd Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Research Institute for Physical Chemical Problems Belarusian State UniversityMinsk 220006Belarus

Semitransparent organic photovoltaics(STOPVs)have gained wide attention owing to their promising applications in building-integrated photovoltaics,agrivoltaics,and floating *** semiconductors with high charge carrier mobility usually have planar and conjugated structures,thereby showing strong absorption in visible *** this work,a new concept of incorporating transparent inorganic semiconductors is proposed for high-performance ***(I)thiocyanate(CuSCN)is a visible-transparent inorganic semiconductor with an ionization potential of 5.45 eV and high hole *** transparency of CuSCN benefits high average visible transmittance(AVT)of *** energy levels of CuSCN as donor match those of near-infrared small molecule acceptor BTP-eC9,and the formed heterojunction exhibits an ability of exciton *** mobility of CuSCN contributes to a more favorable charge transport channel and suppresses charge *** control STOPVs based on PM6/BTP-eC9 exhibit an AVT of 19.0%with a power conversion efficiency(PCE)of 12.7%.Partial replacement of PM6 with CuSCN leads to a 63%increase in transmittance,resulting in a higher AVT of 30.9%and a comparable PCE of 10.8%.

关键词： Copper(I)thiocyanate Inorganic semiconductor Semitransparent Organic photovoltaics Charge dissociation

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Variable dead zone pulse width modulation to reduce conducted electromagnetic interference

Variable dead zone pulse width modulation to reduce conducte...

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China Power Supply Society electromagnetic Compatibility Conference (CPEMC)

作者： Hui Liu Dong Jiang She Yan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331509552

ISBN: (纸本)9798331509569

The switching of the switch will produce a lot of electromagnetic interference (EMI). The time scale of the dead zone is very small, and the actual conduction situation is determined by the direction of the current, and therefore affects the EMI at the MHz level. Based on the principle of spread spectrum modulation, a pulse width modulation (PWM) technique with variable dead zone (VDZ) is proposed in this paper. The simulation and experimental results show that the differential mode EMI can be reduced by about 5dB at 600kHz-5MHz by using VDZPWM at a constant switching frequency.

关键词： Power supplies Switching frequency electromagnetic interference Switches Pulse width modulation electromagnetic compatibility

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A composite enhanced fog water collection method combining plasma and asymmetric wetting microstructure

A composite enhanced fog water collection method combining p...

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IEEE International Conference on Plasma Science (ICOPS)

作者： D. Li C. Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

Fog water collection can effectively alleviate the water scarcity problem faced by humanity. In order to achieve this goal, electrostatic fog water collection has become an emerging technology that is receiving significant attention. Although electrostatic fog water collection technology has advantages such as convenience and economy, there are currently some issues that limit its widespread adoption, such as low collection efficiency, high operating voltage, and power consumption. Furthermore, there is a lack of in-depth understanding and mechanism research of this technology, which hinders the development and optimization of related devices. First, the charging mechanism and force acting on the fog droplets were analyzed, and it was clarified that field-induced charging is the dominant charging mechanism. The motion equation of charged fog droplets was established, providing theoretical guidance for the design of electrostatic fog water collection devices. Subsequently, the corona discharge characteristics in the electrostatic fog water collection device and the discharge process of the nanoelectrode were studied using a multi-scale multi-source discharge model, providing important references for optimizing device performance. In terms of experiments, an electrostatic fog water collection experimental platform was established to study the influence of electrical factors and environmental factors on the collection efficiency. At the same time, micro-nano technology enhancement methods were proposed to improve the electrode surface, thereby enhancing the discharge performance, droplet transport capacity, and collection efficiency of the device. Based on the research results, a new type of electrostatic fog water collection device with high efficiency, low power consumption, and stable operation was designed. Ultimately, a fog water collection efficiency of 96% was achieved, while reducing the operating voltage by 30%. In conclusion, the effective utilization of wate

关键词： Performance evaluation Water Power demand Surface discharges Voltage Mathematical models Plasmas

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A brief review of the development and optimization of the three-dimensional magnetic configuration system in the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 166-171页

作者： Zhonghe JIANG Yonghua DING Bo RAO Nengchao WANG Yangbo LI Jie HUANG International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics(IFPP) State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikJülich 52425Germany

The three-dimensional(3D) magnetic configuration system in the J-TEXT tokamak has featured in many experimental *** system mainly consists of three subsystems:the static resonant magnetic perturbation(SRMP) system,the dynamic resonant magnetic perturbation(DRMP) system and the helical coil *** SRMP coil system consist of two kinds of coils,*** six-loop coils and two five-loop *** can suppress tearing modes with a moderate strength,and may also cause mode locking with larger *** DRMP coil system consists of 12 single-turn saddle coils(DRMP1) and 12 double-turn saddle coils(DRMP2).Its magnetic field can be rotated at a few kHz,leading to either acceleration or deceleration of the tearing mode velocity and the plasma *** helical coil system consists of two closed coils,and is currently under construction to provide external rotational transform in *** 3D magnetic configuration system can suppress tearing modes,preventing and avoiding the occurrence of major disruption.

关键词： tearing mode resonant magnetic perturbation external rotational transform plasma stability J-TEXT tokamak

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Quasi-static magnetic compression of field-reversed configuration plasma:amended scalings and limits from two-dimensional MHD equilibrium

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Plasma Science and technology 2023年第2期25卷 58-67页

作者： Abba Alhaji BALA 朱平李浩龙丁永华刘家兴万遂何莹李达王能超饶波王之江 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 School of Physics Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Physics Federal University DutseJigawa 720101Nigeria Department of Engineering Physics University of Wisconsin-MadisonMadisonWisconsin WI-53706 United States of America College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060People's Republic of China

In this work,several key scaling laws of the quasi-static magnetic compression of field reversed configuration(FRC)plasma(Spencer et al 1983 *** 261564)are amended from a series of two-dimensional FRC MHD equilibriums numerically obtained using the Grad–Shafranov equation solver *** on the new scaling for the elongation and the magnetic fields at the separatrix and the wall,the empirically stable limits for the compression ratio,the fusion gain,and the neutron yield are evaluated,which may serve as a more accurate estimate for the upper ceiling of performance from the magnetic compression of FRC plasma as a potential fusion energy as well as neutron source devices.

关键词： magneto-hydrodynamic equilibrium Grad-Shafranov equation field reversed configuration NIMEQ magnetic compression

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High-precision Digital Phase Discriminator Based on Adaptive Sampling 5

High-precision Digital Phase Discriminator Based on Adaptive...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Lou, Hangchuan Song, Shuang Cheng, Si Liu, Hengyang Wu, Xianglong Kong, Wubin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China Wuhan Maritime Communication Research Institute Hubei China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

A high-precision digital phase discriminator based on adaptive sampling is proposed for an antenna automatic tuning system. FFT is used to detect the phase. The output signal of the tuning system is a periodic signal with a non-constant frequency. To reduce spectrum leakage, adaptive sampling is employed to realize phase detection of sinusoidal periodic signals in a certain frequency range. In addition, the antenna automatic tuning system outputs non-sinusoidal periodic low-power signals during tuning. By adding a frequency comparison in the adaptive sampling process, the phase detection of non-sinusoidal periodic signal in a certain frequency range is realized. The combination of odd-even frequency division and half-integer frequency division is adopted to reduce the phenomenon of spectrum leakage. A phase discrimination experiment platform is constructed to verify the effectiveness of the proposed phase discriminator. The accordance between the analysis and experimental results further testify to the advantages. © 2022 IEEE.

关键词： Antennas

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Structure-free containment control for uncertain underactuated multiple Euler-Lagrange systems

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Science China(Information Sciences) 2023年第11期66卷 150-168页

作者： Housheng SU Yali WU Liren ZHANG Xia CHEN Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China School of Artificial Intelligence and Automation Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

This article studies the problem of structure-free distributed containment control for uncertain underactuated multiple Euler-Lagrange systems(MELSs) considering disturbances by using a layered approach. First, the second layer is the virtual layer constructed artificially for hierarchical control. We move all virtual nodes to the convex hull formed by leaders in the first layer by implementing containment control algorithms on all virtual nodes. Then, the third layer is the following layer, and we propose an adaptive robust tracking controller to ensure that each follower in the third layer tracks the corresponding virtual node in the second layer. So far, the underactuated MELSs can achieve containment control. Furthermore,through the theoretical derivation, sufficient conditions are obtained to achieve the objective of structure-free containment control. Finally, the effectiveness of the proposed stratified structure-free containment control method is verified by a simulation example.

关键词： Euler-Lagrange systems underactuated system containment control adaptive-robust control

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