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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Haoyu Kang Yiming Song Jin Wang Libing Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China AECC Hunan Aviation Powerplant Research Institute Zhuzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

With its compact spatial structure and high power density, the axial flux permanent magnet motor is suitable for specialized applications but also imposes higher cooling requirements. It necessitates a well-designed rotor cooling structure to ensure reliable motor operation. This paper uses a 7kW dual-stator single-rotor axial flux permanent magnet motor as an example. Based on the principle of fluid-solid coupling, the motor's three-dimensional fluid field and temperature field models are established to study the impact of different rotor structures on the motor's heat dissipation capability. The research results indicate that the permanent magnets exhibit the highest temperature rise in a dual-stator single-rotor axial flux permanent magnet motor. By more effectively agitating the air around the permanent magnets and increasing the heat dissipation area of the permanent magnets, the motor's cooling capacity can be improved. Specifically, thinning the rotor support structure can effectively suppress the temperature rise of the permanent magnets.

关键词： Heating systems Couplings Solid modeling Temperature distribution Fluids Cooling Rotors Permanent magnet motors Permanent magnets Stress

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Excess Activity Tuned by Distorted Tetrahedron in CoMoO_(4) for Oxygen Evolution

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Energy & Environmental Materials 2024年第1期7卷 247-252页

作者： Hengbo Xiao Kai Chi Hongxia Yin Xiangji Zhou Pengxiang Lei Peizhi Liu Jiakun Fang Xiuhong Li Songliu Yuan Zhen Zhang Yaqiong Su Junjie Guo Lihua Qian School of Physics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Hubei University of TechnologyWuhan 430068China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry Xi'an Jiaotong UniversityXi'an 710049China

Oxygen vacancies enable modulating surface reconstruction of transition metal oxides containing metal-oxygen polyhedrons into metallic oxyhydroxide for oxygen evolution reaction(OER),while revealing reconstructing mechanism is stuck by the requirement to precisely control exact sites of these ***,oxygen vacancies are localized only within MoO_(4)tetrahedrons rather than CoO_(6)octahedrons in CoMoO_(4)catalyst,guaranteeing coherent reconstruction of CoO_(6)octahedrons into pure CoOOH with tunable activities for ***,distorted tetrahedron accelerates the dissolution of Mo atoms into alkaline electrolyte,triggering spontaneous transition of partial CoMoO_(4)into Co(OH)_(2).CoO_(6)octahedrons in both CoMoO_(4)and Co(OH)_(2)can transform pure CoOOH completely at lower potential,resulting in excess intrinsic activity whose summit is identified by overpotential at 10 mA cm^(-2)with 22.9%reduction and Tafel slope with 65.3%***-defined manipulation over the distorted polyhedrons offers one versatile knob to precisely modulate electronic structure of oxide catalysts with outstanding OER performance.

关键词： metal-oxygen polyhedron oxygen evolution reaction oxygen vacancy Raman spectroscopy

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Unlocking Spatio-Temporal Flexibility of Data Centers in Multiple Regional Peer-to-Peer Energy Transaction Markets

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IEEE Transactions on Power Systems 2025年

作者： Jin, Tianyu Bai, Linquan Yan, Mingyu Chen, Xinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China University of North Carolina at Charlotte William States Lee College of Engineering CharlotteNC28223 United States

Recently, the growth of distributed energy resources (DERs) has aroused peer-to-peer (P2P) energy transaction. With abundant flexibility of shifting computational tasks, data centers could participate in the P2P energy transaction market. However, the revenue that one data center receives through participating in regional P2P markets may conflict with that of the whole company owning several geographical data centers. Furthermore, the market clearing would be more complex after considering the latency characteristics of data centers and privacy protection in P2P transactions. This paper proposes an integrated multiple regional P2P energy transaction (MRPET) model, unlocking both the spatial and temporal flexibility of data centers in P2P trading. The detailed models of data centers, especially considering the total delay in processing tasks, are constructed, as well as several operational constraints of prosumers and P2P energy transaction. A two-stage algorithm based on Alternating Direction Method of Multipliers (ADMM) is proposed for joint clearing of the MRPET markets. The proposed models and algorithm are examined in test systems and the results show that more renewable generation could be locally consumed with the re-dispatch of multiple data centers. Reduced costs are achieved for both the data center company and prosumers. The case study also analyzes the impact of task variation and delay cost on the schedule of data centers and market clearing. © 1969-2012 IEEE.

关键词： Commerce

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Performance Analysis of Linear Induction Motors Considering Space and Time Harmonics 13

Performance Analysis of Linear Induction Motors Considering ...

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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Xiao, Xinyu Xu, Wei Ge, Jian Shangguan, Yongdao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728172101

Under inverter supply, linear induction motor (LIM) is affected by pulse width modulation (PWM) voltage and non-uniform magnetic circuit, which can produce time and space harmonics, and have a negative impact on the drive performance. In order to accurately study the traits and behaviors of the LIM under inverter supply, this paper proposes one comprehensive harmonics equivalent circuit for the LIM. Firstly, the main harmonic components in the motor are analyzed. Then, a harmonics equivalent circuit is proposed, including the derivation of circuit parameters and correction factors. Finally, the performance of LIM considering harmonics is fully investigated and then compared with that of traditional modelling only with fundamental excitation. Both simulation results and theoretical analysis are verified by related experiments. © 2021 IEEE

关键词： Equivalent circuits

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Numerical simulation of disruption mitigation by applying non-resonant magnetic perturbation and massive gas injection on J-TEXT 3

Numerical simulation of disruption mitigation by applying no...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Li, Zhen Jiang, Zhonghe Gu, Fan Jiao, Zixiao Yuan, Jianjun Li, Keze Xiong, Jinyu School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering China

ISBN: (纸本)9781665477321

A lot of experimental and theoretical researches have been carrying out to examine the disruption mechanism and the methods to mitigate disruption, including massive gas injection (MGI) and shattered pellet injection (SPI). Based on NIMROD (non-Ideal Magnetohydrodynamics with Rotation, Open Discussion), numerical simulations of the synergistic effect between non-resonant magnetic perturbations and massive gas injection on disruption mitigation is carrying out in J-TEXT. In this paper, we investigate thermal quench, current quench time and the growth of n=1-3 component MHD instabilities responsed to different amplitudes of non-RMPs. The results indicates that non-RMPs can prolong thermal quench and current quench durations and create stronger perturbations during disruption, leading to a high loss of runaway electrons seeds and reducing the hazard of disruption. © 2022 IEEE.

关键词： Numerical models

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Active Disturbance Rejection Current Control for Synchronous Reluctance Motor 4

Active Disturbance Rejection Current Control for Synchronous...

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

作者： Li, Zibo Zhou, Libing Wang, Jin 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

Synchronous-frame proportional-integral (PI) current control is the most popular solution in industrial synchronous reluctance motor (SynRM) drive systems. However due to the magnetic saturation and winding temperature rise, the motor parameters(Ld, Lq and Rs) vary widely, leading to deterioration of the current controller. To this end, this paper presents an active disturbance rejection current control (ADRCC) scheme for SynRM drives, which has a simple formation and is robust to machine parameter perturbations. An extended state observer (ESO) is designed to estimate the lumped disturbance in real-time. Then, the estimated lumped disturbance compensates the current loop to a first-order integral element. Meantime, the ADRCC parameters (wo and wc) are just expressed in the desired current loop bandwidth and lumped disturbance bandwidth. Finally, the simulation results demonstrate when the parameters are mismatched, ADRCC performs better transient and steady current tracking performance compared to the PI current controller. © 2021 IEEE.

关键词： Electric current control

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Nonparametric Sliding Mode Predictive Current Control for Linear Induction Motor

Nonparametric Sliding Mode Predictive Current Control for Li...

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

作者： Yingcong Guo Wei Xu Han Xiao Jian Ge School of Electrical Engineering Southwest Jiaotong University Chengdu China Key Laboratory of High Density Electromagnetic Power and Systems Chinese Academy of Sciences Institute of Electrical Engineering Beijing China 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

Model predictive control (MPC) enables the linear induction motor (LIM) drive system to maintain good performance despite large distortions in the input voltage waveform, and is particularly suitable for applications with lower converter switching frequencies, such as urban rail transit. However, the parameters of the LIM vary dramatically due to the end effect, which reduces the control performance of the MPC. This paper presents a nonparametric sliding mode predictive current control method to enhance the parametric robustness of MPC. The cost function of nonparametric current control is constructed to overcome the limitation of model predictive control, which is greatly affected by parameter accuracy. The simulation results show that the proposed method can maintain the good control performance of the LIM drive system under the condition of inaccurate parameters, effectively improve the robustness of the system, and has certain engineering significance.

关键词： Current control Rails Electrical engineering Induction motors Switching frequency Simulation Cost function Robustness Voltage control Predictive control

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Stability Analysis and Impedance Reshaping Control of Medium-Frequency Oscillation in a PMSG-based Wind Farm Connected to a VSC-HVDC 7

Stability Analysis and Impedance Reshaping Control of Medium...

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7th Asia Conference on Power and Electrical engineering, ACPEE 2022

作者： Sun, Kun Li, Dahu Yao, Wei Zhou, Yi Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Hubei Electric Power Company Limited Wuhan China Sichuan University Department of Electrical and Engineering Chengdu China

ISBN: (纸本)9781665418195

It is well known that the permanent magnet synchronous generator (PMSG)-based wind farm may face the sub-synchronous oscillation (SSO) or high frequency oscillation (HFO) issue. However, the medium frequency oscillation (MFO) may also exist in a PMSG-based wind farm when integrated with a voltage source converter based HVDC (VSC-HVDC). In this work, to investigate the mechanism and characteristics of MFO, the impedance model of the interconnected system is derived. Furthermore, the influence of the control parameters of both PMSG and VSC-HVDC on MFO is analysed with an accurate criterion based on the single input single output (SISO) equivalent sequence impedance. And the theoretical analysis is verified by simulation. Finally, an impedance reshaping control for MFO is proposed. The results show that MFO can be suppressed with the appropriate virtual impedance installed in the wind farm VSC (WFVSC) station, which is meaningful for the actual project. © 2022 IEEE.

关键词： Permanent magnets

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Integrated multi-mode glass ceramicﬁber for high-resolution temperature sensing

Advanced Powder Materials

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advanced Powder Materials 2023年第4期2卷 54-62页

作者： Yongsheng Sun Meihua Chen Puxian Xiong Yuzhen Wang Shuhang Tian Qingquan Jiang Yao Xiao Hongyou Zhou Peishan Shao Qiuqiang Zhan Jiulin Gan Qi Qian Dongdan Chen Zhongmin Yang School of Materials Science and Engineering School of Physics and OptoelectronicsState Key Laboratory of Luminescent Materials and DevicesInstitute of Optical Communication MaterialsGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesAnd Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhou 510641China Centre for Optical and Electromagnetic Research National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsMOE Key Laboratory&Guangdong Provincial Key Laboratory of Laser Life ScienceSouth China Normal UniversityGuangzhou 510631China

Optical temperature sensors,which can accurately detect temperature in biological systems,are crucial to the development of healthcare *** challenge the state-of-art technology,it is necessary to design single luminescence center doped materials with multi-wavelength emission for optical temperature sensors with more modes and higher ***,an Er^(3+)single-doped KYF4 nanocrystals glass ceramic with an obvious thermochromic phenomenon is reported for theﬁrst time,which shows a different temperature-dependent green,red,and near-infrared luminescence behavior based on thermal disturbance *** addition,Er^(3+)single-doped GCﬁber was drawn and fabricated into multi-mode opticalﬁber temperature sensor,which has superior measured temperature resolution(<0.5℃),excellent detection limit(0.077℃),and high correlation coefﬁcient(R^(2))of *** importantly,this sensor can monitor temperature in different scenarios with great environmental interference resistance and *** results indicate that our sensor shows great promise as a technology for environmental and healthcare monitoring,and it provides a route for the design of opticalﬁber temperature sensors with multi-mode and high resolution.

关键词： Er^(3+) Glass ceramic Thermochromic Opticalﬁber sensor Healthcare monitoring

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Design and Simulation of Three-Phase electromagnetic Wiping Device for Steel Strips Hot-Dip Galvanizing

Design and Simulation of Three-Phase Electromagnetic Wiping ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Weilin Chen Xiaotao Han Tonghai Ding Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

electromagnetic wiping has the advantages of non-contact and easy control compared to traditional gas wiping. However, electromagnetic wiping devices available are primarily designed for cylindrical workpieces such as steel wire and pipes, leading to low efficiency when applied to steel strips. This paper presents a three-phase electromagnetic wiping device for hot-dip galvanizing of steel strips. Based on the traveling magnetic field of the linear motor, the device allows precise control over coating thickness by adjusting the frequency and amplitude of the current. A Multiphysics model of the electromagnetic field and fluid field is established to study the body force of the coating in a hot-dip galvanizing process. Simulation results show that the proposed wiping device can effectively remove the excess zinc liquid and reduce coating thickness.

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