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Maximal Force Capability Strategy for Short-Circuit Fault-Tolerant of AMB Power Electronics Drive

IEEE Transactions on Power Electronics 2025年

作者： Shuai, Yixuan Zhou, Mingqu Chen, Yihua Xie, Yuanhao Ding, Jianfu Jiang, Dong Liu, Zicheng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Switch short-circuit failures pose significant reliability challenges to active magnetic bearing (AMB) systems, yet existing fault-tolerant strategies predominantly rely on hardware redundancy with limited control-oriented solutions. This paper overturns the conventional assumption that faulty H-bridge loses current controllability. It reveals their retained operational capacity despite compromised force capability. The key innovation lies in identifying freewheeling mode's pivotal role in post-fault current dynamics. Via a detailed analysis of faulty circuits, this study defines the boundaries of current change rates and proposes a universal maximal force capacity strategy by optimizing current distribution with variable bias current control. Experimental results confirm the proposed method's effectiveness, offering a more robust solution for switch short-circuit failures. © 1986-2012 IEEE.

关键词： Short circuit currents

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Subcellular Distribution of Prussian Blue Nanozymes Dictate Enzymatic Activity and Macrophage Polarization for Effective Colitis Therapy

SSRN

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SSRN 2025年

作者： Ding, He Long, Mengmeng Wu, Yuehuang Zhang, Yuxin Yang, Zhenyu Yan, Xianwu Li, Yan Shen, Yan Zhang, Miao Zhang, Yunjiao Sheng, Jingyi Gu, Ning Nanjing210009 China Nanjing Key Laboratory for Cardiovascular Information and Health Engineering Medicine Institute of Clinical Medicine Nanjing Drum Tower Hospital Medical School Nanjing University Nanjing210093 China Key Laboratory of Biomedical Engineering of Guangdong Province National Engineering Research Center for Tissue Restoration and Reconstruction School of Medicine South China University of Technology Guangzhou510006 China Key Laboratory for Bio-Electromagnetic Environment and Advanced Medical Theranostics School of biomedical engineering and informatics School of Biomedical Engineering and Informatics Nanjing Medical University Nanjing211166 China

As a typical multi-enzymic nanozymes, Prussian blue nanozymes (PBNZs) mimic the catalytic functions of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) enzymes in a pH-dependent manner. Due to their reactive oxygen species (ROS) modulating capacity, PBNZs are considered a promising tool for immune modulation, especially for directional regulation of macrophage polarization. However, the biological dynamics of pH-dependent multienzyme activity in cells remain poorly understood. Here, we demonstrated that the intracellular localization of PBNZs is a critical factor in their regulation of ROS and macrophage polarization. Smaller-sized PBNZs (3 nm) efficiently bypass acidic lysosomal environments (pH 4.6) and accumulate in the cytosol (pH 7.4) where they exhibit reduced POD-mimic activity and enhanced CAT- and SOD-mimic functions. Conversely, larger-sized PBNZs (∼60 nm and ∼170 nm) predominantly remained in acidic lysosomes (pH 4.6), exhibiting stronger POD-mimic activity but minimal CAT-mimic function. Additionally, we identify hypoxia-inducible factor 1-alpha (HIF-1a) as a potential mediator that senses alterations in intracellular O2 levels induced by PBNZs, thus modulating the transcription of genes involved in macrophage polarization. Moreover, oral administration with 3 nm PBNZs@pvp effectively mitigated dextran sodium sulfate (DSS)-induced acute colitis in mice, owing to their great capacity to modulate macrophage function. Our study provides insights into the complex behavior of multi-enzymatic PBNZs within the intracellular milieu, reveals their therapeutic potential in treating colitis, and offers a foundational rationale for the tailored design of multi-enzymic nanozymes with specific macrophage modulatory properties for therapeutic applications. © 2025, The Authors. All rights reserved.

关键词： Superoxide dismutase

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First-Principles Study on the Cu-Cr Interfaces in Vacuum Circuit Breaker Contacts

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SSRN 2023年

作者： Gui, Xianxian Wu, Chuanqi Yuan, Zhao Liu, Liming Wang, Cao Chen, Lixue Liu, Xueliang Ye, Jingjing Liu, Shan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Key Lab Pulsed Power Technol Minist Educ School of Electrical and Electronic Engineering Hubei Wuhan430074 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China

Based on the experimental phenomenon that the breakdown position of the CuCr contact head in a vacuum circuit breaker may be the Cu-Cr phase boundary, the Cu-Cr interfacial binding models have been developed. The work function, density of states, work of interfacial separation, interfacial energy, charge transfer, band energy, and charge density distribution of Cu, Cr and Cu-Cr phase boundaries are calculated from the first principles. The internal properties of CuCr contact breakdown have been analyzed from the microscopic atomistic point of view. The CuCr interface junction was found to have a smaller work function than pure copper and pure chromium. The reduced work function is prone to field emission, thus increasing the possibility of electrical breakdown. Three interfacial binding models Cu(110)/Cr(110), Cu(111)/Cr(111) and Cu(110)/Cr(100) are established in this paper. By comparing the separation work and interfacial energy, it is found that Cu(111)/Cr(111) is relatively stable. In this paper, we provide a theoretical basis for increasing the voltage strength of vacuum circuit breakers. © 2023, The Authors. All rights reserved.

关键词： Timing circuits

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Application of 3D MHD equilibrium calculation to RMP experiments in the J-TEXT tokamak

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Plasma Science and technology 2021年第8期23卷 70-81页

作者： Zhaosu WANG Yunfeng LIANG Zhonghe JIANG Jie HUANG Yasuhiro SUZUKI Alexander KNIEPS Song ZHOU Jinyu XIONG Jiankun HUA Zhipeng CHEN Zhongyong CHEN Nengchao WANG Zhoujun YANG Yonghua DING 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 Forschungszentrum Jülich GmbH Institute für Energie-und Klimaforschung—Plasmaphysik52425 JülichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China National Institutes of Fusion Sciences National Institutes of Natural SciencesOroshi-cho322-6Toki 509-5292Japan SOKENDAI The Graduate University for Advanced StudiesOroshi-cho322-6Toki 509-5292Japan Chengdu University Chengdu 610106People's Republic of China

The application of resonant magnetic perturbation(RMP)coils could break the initial axisymmetry and change the magnetic topology in tokamak *** understand the plasma equilibrium response to the RMP fields,three-dimensional(3 D)non-linear magnetohydrodynamics equilibrium calculations have been carried out using the HINT code for an RMP field-penetration experiment on *** HINT code does not assume perfectly nested flux surfaces,and is able to consider directly the change of magnetic topology due to the RMP field *** between 3 D equilibrium calculations and experimental observations are *** magnetic topologies calculated by HINT were compared with the field topologies obtained from a vacuum approximation *** turns out that the effects of redistribution of plasma pressure and current due to the formation of magnetic islands at various resonant rational surfaces should be considered self-consistently for understanding the change of magnetic *** changes include changes in the shape and size of magnetic islands,and the distribution of stochastic fields around the magnetic islands and at the plasma boundary,which plays an important role for plasma-wall interactions.

关键词： 3D equilibrium RMP magnetic topology

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Magnetic shielding of wireless power transfer using zero permeability metamaterial slab 1

Magnetic shielding of wireless power transfer using zero per...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Lu, Conghui Huang, Xiutao Rong, Cancan Tao, Xiong Zeng, Yingqin Liu, Xiaobo Liu, Minghai Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Aerospace Institute of Advanced Material Processing Technology Beijing100074 China

ISBN: (纸本)9781728196596

electromagnetic radiation generated by the wireless power transfer (WPT) can be harmful to humans and environment. In order to satisfy the safety requirements, electromagnetic leakage to the nearby transmission channels should be controlled below a safe level. Except for the ferrite and metallic shielding materials, several researchers have put forward the zero-permeability metamaterial (ZP-MM). However, there have been few scientific studies with the application of ZP-MM in four-coil WPT systems. In this paper, we propose an optimized ZP-MM for shielding leaked magnetic field. Next, we setup a miniaturized WPT system loaded with ZP-MM at 13.56MHz. As a result, when ZP-MM is used, the transmission efficiency is reduced about 28.8% and the magnetic field magnitude of the receiver has been decreased about 72.7%, compared to free space. To better highlight the shielding effect, the aluminum plate is inserted in the middle of the Tx and Rx coils. The results show that the shielding effect of ZP-MM is better than aluminum plate. Obviously, the proposed ZP-MM has good performance in magnetic field shielding for WPT systems. © 2020 IEEE.

关键词： Magnetic fields

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Influence of the X-point location on edge plasma transport in the J-TEXT tokamak with a high-field-side single-null divertor

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Plasma Science and technology 2021年第12期23卷 42-54页

作者： Hao WANG Yunfeng LIANG Shuai XU Zhonghe JIANG Yuhe FENG A KNIEPS P DREWS Jie YANG Xin XU Ting LONG Shaodong JIAO Xiaolong ZHANG Zhigang HAO Qinglong YANG Zhipeng CHEN Zhongyong CHEN Nengchao WANG Zhoujun YANG Xiaoqing ZHANG Yonghua DING Yuan 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 Forschungszentrum Julich GmbH Institut fur Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)52425 JiilichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Max-Planck-Institut fur Plasmaphysik EURATOM Association17491 GreifswaldGermany Southwestern Institute of Physics Chengdu 610041People's Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China

High-density experiments in the high-field-side mid-plane single-null divertor configuration have been performed for the first time on *** experiments show an increase in the highest central channel line-averaged density from 2.73×10^(19)m^(-3) to 6.49×10^(19)m^(-3),while the X-point moves away from the target by increasing the divertor coil *** corresponding Greenwald fraction rises from 0.50 to *** the impurity transport,the density normalized radiation intensity(absolute extreme ultraviolet and soft x-ray)of the central channel density decreased significantly(>50%)with an increase in the plasma *** better understand the underlying physics mechanisms,the 3 D edge Monte Carlo code coupled with EIRENE(EMC3-EIRENE)has been implemented for the first time on *** simulation results show good agreement with the experimental *** the X-point moves away from the target,the divertor power decay length drops and the scrape-off layer impurity screening effect is enhanced.

关键词： edge plasma transport divertor configuration EMC3-EIRENE

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Net Damping Criterion for Stability Analysis of Grid-tied VSCs in DC Voltage Control Timescale

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CSEE Journal of Power and Energy Systems 2020年第3期6卷 601-609页

作者： Dong Wang Yunhe Hou Jiabing Hu School of Automation Wuhan University of TechnologyWuhan 430070China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina HKU Shenzhen Institute of Research and Innovation Shenzhen 518057China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

Stability of grid-connected VSCs in DC voltage control(DVC)timescales(i.e.,the frequency range of dynamics covering converter outer controls)has recently caught increased attention,while the existing approaches,such as eigenvalue analysis and dq-domain impedance analysis,have respective limitations on addressing these types of stability *** paper proposes an alternative net damping criterion dedicated for analyzing the DVC timescale stability in a multi-VSC *** criterion is strictly mapped from the Nyquist stability criterion utilizing the gain margin concept,which preserves the advantages of the classical positive net damping criterion suggested by Canay[20]–allowing for decomposition analysis of a subsystem’s contribution to the closed-loop stability in a single-input single-output(SISO)framework,but overcomes its deficiency of possibly erroneous prediction of system dynamic *** studies show that the proposed criterion can correctly predict some unstable conditions(e.g.,monotonic divergence)which cannot be identified by the classical net damping ***,the condition for when the classical criterion is available is also pointed out,the proposed criterion can also act as a complement of the classical criterion for stability examination.

关键词： DC voltage control timescale multiple VSCs net damping criterion stability

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Prospects for Power Systems with High Proportion of Renewable Energy Considering the Coordination of Source-grid 14

Prospects for Power Systems with High Proportion of Renewabl...

引用

14th International Conference on Computer and Electrical engineering, ICCEE 2021

作者： Ling, Xu Yu, Haiyang Wang, Yuan Wu, Yaowu Liang, Shuhao Hu, Zhigang Central China Branch of State Grid Corporation of China Wuhan430074 China China-EU Institute for Clean and Renewable Energy 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

In the future, the spatiotemporal distribution of a high proportion of renewable energy will bring unprecedented challenges to power system, and the basic form and operation of power system will have great changes. On the basis of investigating the research status in China and abroad, this paper expounds the scientific problems faced by the planning of Power Systems with High Proportion of Renewable Energy (PSHPRE) considering the coordination of source-grid, and put forward the basic ideas and framework of research from four aspects: overview of the development of PSHPRE, power planning in PSHPRE and coordinated planning of source-grid in PSHPRE. Finally, the prospects for Power Systems with High Proportion of Renewable Energy considering the coordination of source-grid are presented. © Published under licence by IOP Publishing Ltd.

关键词： Renewable energy resources

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A gating path optimization method for press-pack IGBT 1

A gating path optimization method for press-pack IGBT

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Min, Huaidong Wang, Zhao Chen, Yu Peng, Li Kang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei430074 China

ISBN: (纸本)9781728196596

IGBT devices are widely used in high-voltage and high-power applications. IGBT module has two kinds of packaging structure, which are welded IGBT and press-pack IGBT (PP-IGBT). Since a PP-IGBT module can integrate more chips and diode chips to obtain a large current capacity, it has been widely used in high power applications. However, due to the individual differences of chips in parallel, the stray parameters of the gating loops may be different, which leads to the imbalance of current and thermal problem of PP-IGBT, and eventually lead to the failure or even damage of the device. In this paper, some key factors resulting inconsistency of stray parameters in gating loops are reviewed, and a methodology to make the gating loops more consistent are proposed. The feasibility of the methodology is also verified by ANSYS software simulation. © 2020 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

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Plasma Science and technology 2021年第10期23卷 112-119页

作者： Yaoyu Xie Kaijun Zhao Zhipeng Chen Jiaqi Dong Kimitaka Itoh Zhongyong Chen Yuejiang Shi Yonghua Ding Jun Cheng Longwen Yan Hai Liu Zhifeng Cheng Zhoujun Yang Nengchao Wang Lu Wang Jianqiang Xu Yunfeng Liang J-TEXT Team School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China 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 Institute of Science and Technology Research Chubu UniversityKasuga 816-8580Japan Research Center for Plasma Turbulence Kyushu UniversityKyushu UniversityChubu UniversityAichi 487-8501Japan National Institute for Fusion Science Toki 509-5292Japan ENN Science and Technology Development Co. Ltdand Hebei Key Laboratory of Compact FusionLangfang 065001People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first *** Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at the GAM frequency is observed in Mach number *** toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal *** ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and *** higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low *** coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated,and are higher than those between radial electric fields and Mach number fluctuations.

关键词： zonal flow geodesic acoustic mode tokamak return flow Mach number

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