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Modeling Analysis of Efficiency Improvement of Passive Array Coils Involved in Wireless Power Transfer System 1

10th Frontier Academic Forum of Electrical engineering, FAFEE 2022

作者： Chen, Mengmeng Lu, Yang Liu, Renzhe Wu, Zhousen Rong, Cancan Xia, Chenyang Liao, Zhijuan Liu, Xu School of Electrical Engineering China University of Mining and Technology Xuzhou221116 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819934041

ISBN: (纸本)9789819934034

The transmission efficiency of wireless power transfer system is generally low due to the large transmission distance. In addition, the transmitter and receiver are usually fixed, which will lead to weak robustness as well. In the paper, the solenoid array coils (SAC) are design to increase the mutual coupling between the two coils, which will enhance the transfer efficiency. SACs are composed of recycled array coils (RAC) and concentrated array coils (CAC), which are used to improve the density of magnetic lines of flux between the transmitter and the receiver. In this paper, the design process and modeling process are described in detail. The simulation results show that the transmission efficiency of the wireless power transfer system is improved from 72.79% to 83.01% after optimization. Moreover, the distribution of the system magnetic field and the circuit simulation waveforms also verify the correctness and feasibility of the passive array coils analysis and design, and provide a solution for the existing engineering problems. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Circuit simulation

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Effect of electrochemical hydrogen charging on the microstructure and mechanical behavior of a duplex structured Mg-8wt.%Li alloy

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Journal of Magnesium and Alloys 2025年第2期13卷 668-680页

作者： Shuo Wang Daokui Xu Baojie Wang Dongliang Wang Zhiqiang Zhang Li Liu Jie Chen Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Spallation Neutron Source Science Center Dongguan523803China

In this work,through performing microstructural characterization,tensile testing and failure analysis,the influence of electrochemical hydrogen charging on the microstructure and mechanical behavior of an as-cast Mg-8wt.%Li alloy was *** revealed that after being hydrogen charged at 50 mA/cm2 for respectively 3 h,6 h and 18 h in 0.1 M NaCl solution,obvious HID occurred and the damage degree was gradually increased with the hydrogen charging *** the sample being hydrogen charged for 3 h,micro pores with the diameter ranging from 10~30µm were formed and preferentially present inα-Mg ***,micro cracks with the length ranging from 10~50µm mainly initiated inα-Mg phase,atα-Mg/β-Li interfaces and the peripheries of *** the increase of hydrogen charging time,the numbers of pores and cracks were obviously *** results revealed that the hydrogen charging can simultaneously decrease the tensile strength and ductility of the *** with the uncharged sample,the tensile yield strength,ultimate tensile strength and the elongation ratio to failure were respectively reduced by 5.7%,7.3%,31.7%for the 3h-charged sample and 24.6%,24.8%,67.0%for the 18h-charged *** analysis indicated that hydrogen charging can induce the brittle cracking of the alloy and the size of brittle cracking region being composed of quasi-cleavage facets and interfacial cracks on the fracture surfaces was increased with the hydrogen charging time.

关键词： Magnesium-lithium alloy Microstructure Hydrogen-induced damage Hydrogen embrittlement Mechanical behavior

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Design and development of the beamline for a proton therapy system

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Nuclear Science and Techniques 2021年第12期32卷 53-63页

作者： Bin Qin Xu Liu Qu-Shan Chen Dong Li Wen-Jie Han Ping Tan Zhong-Qi Zhang Chong Zhou Ao-Te Chen Yi-Cheng Liao Wei Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

A proton therapy(PT)facility with multiple treatment rooms based on the superconducting cyclotron scheme is under development at Huazhong University of Science and technology(HUST).This paper attempts to describe the design considerations and implementation of the PT beamline from a systematic *** considerations covering beam optics and the influence of high-order aberrations,beam energy/intensity modulation,and beam orbit correction are *** addition to the technical implementation of the main beamline components and subsystems,including the energy degrader,fast kicker,beamline magnets,beam diagnostic system,and beamline control system are introduced.

关键词： Proton therapy Beamline Beam optics Beam energy/intensity modulation

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Development of the pellet injection system on the J-TEXT tokamak

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Plasma Science and technology 2022年第9期24卷 127-133页

作者： Yingzhou JIANG Zhongyong CHEN You LI Wei YAN A LUKIN I VINYAR Feng LI Xin XU Zhipeng CHEN Zhoujun YANG Nengchao WANG 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 PELIN LLC Saint-Petersburg 190031Russia

Pellet injection is an attractive technology for core-fueling and magnetohydrodynamic study in magnetic-conflnement fusion devices like tokamaks and *** can inject solid hydrogen/deuterium pellets into the plasma with deeper density deposition compared with other fueling methods,such as gas pufflng.A three-barrel H_(2)pellet injection system was installed on the J-TEXT tokamak and experiments were carried *** pellets are formed in three barrels cooled by a cryocooler and compressor system at around 9 K,and are 0.8 mm/1 mm diameter and 0.8 mm *** pellet is launched by helium propellant gas and injected from the lowfleld side of the *** normal range of pellet speed is 210–310 m s^(-1)for different propellant gas *** to the three-barrel structure,the number of injected pellets can be adjusted between one and *** can be launched sequentially with arbitrary time intervals,which enables flexible *** results of the experiments show that pellet fueling efflciency can reach 50%.The energy conflnement time increased by about 7.5–10 ms after pellet injection.

关键词： J-TEXT pellet injection system pellet fueling

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Research on Capacity Configuration Method of Underwater Compressed Air Energy Storage Considering Offshore Wind Power 4

Research on Capacity Configuration Method of Underwater Comp...

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4th International Conference on Energy engineering and Power Systems, EEPS 2024

作者： Shao, Ming Lou, Suhua Wu, Yaowu Lin, Yong Wu, Weijie Zuo, Zhengmin Liu, Peiyu Mo, Mingshan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Power grid planning research center Guangdong power grid corporation Guangzhou China

ISBN: (纸本)9798350366914

In order to cope with the challenges brought by the volatility and randomness of new energy output such as offshore wind power, underwater compressed air energy storage (UCAES) has been widely concerned and has broad development and application prospects. A capacity configuration model of underwater air compressor considering offshore wind power is presented in this paper. Firstly, the model of underwater compressed air energy storage and wind power output is established. Then, the capacity optimization configuration model of UCAES is constructed with the goal of optimal economic benefit. Finally, the model is analyzed according to the solving results, and the results show that the validity of the model is verified. © 2024 IEEE.

关键词： Windmill

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Comparative Study of Four-Phase Flux Modulated Doubly-Salient Reluctance Motors With Different Winding Polarity Configurations 5

Comparative Study of Four-Phase Flux Modulated Doubly-Salien...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Yu, Zhiyue Gan, Chun Ni, Kai Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

To reduce the torque ripple and radial vibration, the flux modulated doubly-salient reluctance motor (FMDRM) drives are investigated, where the conventional quasi square current excitation scheme is replaced by the novel dc-biased sinusoidal current excitation scheme with the guidance of the flux modulation principle. However, the existing investigations mainly focus on the three-phase FMDRM. To evaluate the performance of the four-phase FMDRM, this paper proposes a comparative study of the four-phase FMDRMs with different winding polarity configurations. The electromagnetic characteristics of the four-phase 8/6 FMDRMs with commonly utilized 4N4S and NSNS winding polarity configurations are investigated in detail. The magnetomotive force (MMF), winding inductance, phase back electromotive force (back-EMF), torque output capability, and torque ripple are analyzed and compared. In addition, the corresponding finite element analysis (FEA) results are carried out for motor performance comparison. The results show that, compared to the NSNS winding polarity, the 4N4S polarity can achieve a better overall torque performance in the steady-state. However, the NSNS polarity can achieve better overload capacity. © 2022 IEEE.

关键词： Reluctance motors

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Online Junction Temperature Monitoring for Discrete SiC MOSFET Based on On-state Voltage at High Temperature

Online Junction Temperature Monitoring for Discrete SiC MOSF...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Hu, Haoran Wang, Zhiqiang Zhou, Yimin Zhou, Da Xin, Guoqing Shi, Xiaojie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

Junction temperature monitoring is crucial for condition monitoring and thermal management of power semiconductor devices. In this paper, the online monitoring of junction temperature for discrete SiC MOSFETs is achieved by simultaneous measurements of their on-state voltage and current. A dedicated calibration circuit that decouples switching and conduction losses is used to obtain a look-up table for the junction temperature. According to the test results, under the operating condition with current of 50 A and temperature of 175°C, a single pulse test of 10 μ can cause a temperature rise of 8-9 °C, due to the self-heating effect of the discrete SiC MOSFETs. This temperature rise of DUT during the calibration test is compensated by the Foster network thermal model of the device afterwards. © 2022 IEEE.

关键词： Junction temperature

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Directional Pilot Protection Method of Energy Ratio of Whole Frequency Band for VSC-HVDC grid based on improved HHT 11

Directional Pilot Protection Method of Energy Ratio of Whole...

引用

11th Annual Meeting of CSEE Study Committee of HVDC and Power Electronics, HVDC 2022

作者： Chen, Tiantian Zhao, Zhenting Li, Yinhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839538568

A directional pilot protection method of energy ratio of whole frequency band based on improved HHT is proposed to solve the problems of flexible DC line backup protection which is easily affected by the distributed capacitance of transmission line, synchronous communication, high resistance and applicability of algorithm. Firstly, by analysing the amplitude frequency response characteristics of the line boundary under forward and reverse faults, the attenuation effect of the boundary on the energy of different frequency band is obtained;Then, the improved HHT algorithm based on EEMD is used to extract the voltage energy of each frequency band, and constructs the fault detection criterion, direction criterion and pole selection criterion;Finally, based on PSCAD/EMTDC simulation platform, the effectiveness of the protection scheme is verified. © 2222 IET Conference Proceedings

关键词： Frequency response

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A High-Efficiency Bidirectional LLC Resonant Converter Based on Current-Doubler Rectification Circuit 5

A High-Efficiency Bidirectional LLC Resonant Converter Based...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Dong, Mingyang Chen, Changsong Xu, Zhiwen Chen, Haowen Han, Dongtong Zhang, Jingyre Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

With the development of microgrids, DC/DC converters for bidirectional energy transmission between DC bus and energy storage batteries have received more and more attention. In order to convert the high voltage of the DC bus and the low voltage of the batteries, the converters with high-ratio transformers are widely used. However, high transformation ratio brings large secondary winding current, which causes large loss. To improve this defect, the current-doubler rectifier circuit and the LLC resonant converter is combined to build a new bidirectional DC/DC converter. The proposed topology not only reduces the secondary winding current but also reduces the number of MOSFETs, thus improving the efficiency of the converter. The working principle of the proposed converter is introduced, and the problem of voltage spikes in reverse operation is solved by means of ideally inverse coupled inductors. Through comparison and analysis, the feasibility of the proposed topology is verified and the results show that the proposed converter has higher efficiency than the traditional bidirectional LLC converter. © 2022 IEEE.

关键词： Topology

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Remaining Useful Life Prediction of Li-Ion Batteries by Multi-modal Attention Fusion Network

Remaining Useful Life Prediction of Li-Ion Batteries by Mult...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Sha, Wuxin Cheng, Danpeng Han, Qigao Guo, Yaqing Du, Baoshuai Cheng, Shijie Cao, Yuan-Cheng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China State Grid Shandong Electric Power Research Institute Jinan250003 China

ISBN: (纸本)9798331530174

Lithium-ion batteries are crucial for electric vehicles and smart grids, yet their performance degrades with charge-discharge cycles, leading to reduced capacity and increased resistance. Predicting the Remaining Useful Life (RUL) is essential for preventing failures and ensuring stable operation. However, estimating RUL is challenging due to its indirect measurability and the influence of various factors such as battery components, packaging processes, and operating conditions. This paper presents a Multimodal Attention Fusion Neural Network (MAFN) to forecast battery health and RUL using historical data. Trained on a diverse electrochemical dataset with various battery components and cycling conditions, the model integrates battery materials and electrical signals, capturing critical aging features for accurate RUL prediction. This approach advances rapid RUL estimation, enhancing battery management systems and supporting smart grid and carbon neutrality goals. © 2024 IEEE.

关键词： Lithium-ion batteries

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