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

作者： Wang, Qiyuan Liu, Zicheng Jiang, Dong Liu, Kang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

In recent years, the multi-module motor becomes more and more popular because of its advantage in control freedom. In the multi-module motor system driven by paralleled inverters, the carrier phase-shift modulation algorithm can change the phase of the radical electromagnetic force between the motor modules in high-frequency, which can change the motor vibration characteristics. This paper firstly analyzes the relationship between carrier shifted-angle and the radial electromagnetic force of the motor, theoretically. Then, the motor vibration experiments are implemented which obtains the vibration distribution of the multi-module motor under different carrier shifted-angles. According to theoretical analysis and experimental results, we can get the vibration characteristics and mechanism of multi-module motors with different carrier shifted-angles, which provide a new viewpoint for the further research on vibration reduction methods of multi-module motors. © 2020 IEEE.

关键词： Vibration analysis

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A Real- Time Self-Learning Control for Megahertz GaN-based DC-DC Converter

A Real- Time Self-Learning Control for Megahertz GaN-based D...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Jing Chen Yu Chen Yong Kang The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology (HUST) Hubei China

ISBN: (纸本)9781665448178

With the vigorous development of the wide bandgap power devices, the switching frequency of DC-DC converter is improved to MHz. But it leads to the problem that the high-performance but complicated adaptive control methods cannot be completed in such a short switching cycle. To solve it, this paper proposes a real-time self-learning control methodology, which can be implemented at MHz switching frequency by FPGA and its dynamic control performance can be real-time enhanced. A GaN-based buck converter prototype with 1 MHz switching frequency is built to demonstrate the feasibility of the proposed real-time self-learning control methodology.

关键词： Photonic band gap Switching frequency Heuristic algorithms Asia Switches Control systems Real-time systems

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Asymmetric-Structure Modification of Terahertz All-Dielectric Metamaterial for electromagnetically Induced Transparency Analogue with High-Quality Factor

Asymmetric-Structure Modification of Terahertz All-Dielectri...

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International Conference on Infrared and Millimeter Waves

作者： Yanqi Hu Liming Zhong Chi Zhang Guang Zeng Yongqian Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

An all-dielectric metamaterial (ADMM) based on asymmetric split-ring resonator (A-SRR) is proposed and numerically demonstrated in the terahertz range. The coupling between a bright mode supported by the silicon bars and a dark mode supported by the A-SRR leads to an analogue of electromagnetically induced transparency (EIT). By simply modifying the symmetric SRR into the asymmetric structure, the quality factor of the EIT peak can significantly increase from 255 to 1410, exhibiting a better slow-light performance. This work gives a new way to adjust the asymmetry of the ADMM for higher quality factor, which is useful for applications in slow-light devices and chemical/biological sensors.

关键词： Q-factor Performance evaluation Couplings Chemical sensors Millimeter wave devices Metamaterials Silicon

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Research on transient interaction mechanism of two PMSG considering different nodes and network characteristics 1

Research on transient interaction mechanism of two PMSG cons...

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

作者： Mao, Zichen Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Compared with the traditional AC power system, high proportion of renewable generation and power electronics are the characteristics of the power electronic dominated power system. The multi-time scale problem of the dynamical problems becomes prominent. There are complex interactions between power electronics. First, this paper describes the multi-time scale control links of equipment in the power electronic dominated power system and the mechanism of the multiscale with the example of permanent magnetic synchronous generator (PMSG).Second, a multi-time scale nesting model for analyzing interaction is proposed. Finally, the phenomenon of multi-time scale interaction between two PMSG is explained by simulation, and the influence of different node and network characteristics on the degree of interaction is explored, which provides references for subsequent analytical analysis. © 2020 IEEE.

关键词： Synchronous generators

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Enhanced Radiolysis Performance and Mineralization of Ciprofloxacin by Ionizing Radiation Combined with G-C3n4/Cds

SSRN

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SSRN 2022年

作者： Ye, Qi Zhu, Yi Yang, Miao Zhao, Long State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan430074 China

In this study, the degradation of ciprofloxacin (CIP) was investigated in the synergetic system of electron beam irradiation (EBI) combined with graphite carbon nitride / carbon nanodots (g-C 3 N 4 /CDs). The results suggested that the presence of g-C 3 N 4 /CDs could not only promote the degradation of CIP but also significantly enhanced the mineralization ratio. At 25 kGy, the mineralization ratio increased from 18.1% to 69.0% while g-C 3 N 4 /CDs was added. Regeneration experiments revealed that the g-C 3 N 4 /CDs composite possessed good reusability. In addition to finding that the presence of CO 3 2- , HCO 3 - , NO 3 - and NO 2 - obviously restrained the radiolysis process of CIP, the adding of Cl - and SO 4 2- could also have slight inhibitory effects. The effect of various water matrices in EBI&g-C 3 N 4 /CDs systems suggested that the degradation efficiency decreased in lake and tap water. Moreover, the studies in the presence of different radical scavengers suggested that ·OH was the main reactive species in the degradation process. The possible degradation pathway of CIP was proposed in the light of intermediate products using Liquid chromatograph-mass spectrometer (LC–MS) analysis coupled with DFT calculations. © 2022, The Authors. All rights reserved.

关键词： Radiolysis

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An Improved Approach Based on Transformer Network for Remaining Useful Life of Lithium-ion Battery

An Improved Approach Based on Transformer Network for Remain...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Jilong Mao Xin Yin Rui Chen Kai Ding Lin Jiang Jinmu Lai Xianggen Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China The Department of Electrical Engineering and Electronics University of Liverpool Liverpool U.K. CYG SUNRI CO. LTD. Shenzhen China School of Electrical and Information Engineering Zhengzhou University Zhengzhou China

In the midst of a growing energy crisis, lithium batteries are attracting attention from various countries. With the massive use of lithium batteries in energy storage systems, accurately predicting the health status of lithium batteries has become a key issue. In battery management systems, predicting battery life is an important part, but it is difficult for current RNN-based neural networks to learn dependencies between distant positions, resulting in reduced accuracy. In this paper, we presented the EMD-Transformer method to achieve accurate prediction of battery life using only a small amount of online battery data. In the data pre-processing process, offline data were added to the dataset. Then EMD was used to extract lifetime degradation trends as well as capacity regeneration information. The Transformer model was used to get prediction results. Finally, a comprehensive SOH prediction result was generated by integrating all the separate results. Using a few battery lifetime data, we demonstrated that the RMSE of the prediction results is within 3%, which owes a higher accuracy than the existing Transformer and LSTM methods.

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Enhanced dynamo drive for the sawtooth relaxation process due to non-uniform resistivity distribution in a reversed field pinch

arXiv

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arXiv 2025年

作者： Yan, Wentan Zhu, Ping Li, Hong Liu, Wandong Luo, Bing Li, Haolong KTX Laboratory Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Hunan Province Key Laboratory Integration and Optical Manufacturing Technology College of Mathematics and Physics Hunan University of Arts and Science Hunan Changde415000 China Department of Physics School of Science Tianjin University of Science and Technology Tianjin300457 China

In this work, we use the three-dimensional resistive MHD code NIMROD to investigate the impact of resistivity inhomogeneity on the sawtooth process of an reversed field pinch (RFP) plasma. The simulation employs a non-uniform resistivity profile similar to experiments, which monotonically increases from the core to the edge as the temperature decreases. The resistivity inhomogeneity introduces an additional electric field in the plasma, which accelerates the inward diffusion of magnetic flux and changing the self sustained reversal state, hence significantly enhances the dynamo effect and the sawtooth process in the RFP plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Electric fields

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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...

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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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Transient Stability Analysis of the Standalone System Constructed by Paralleled Grid-Forming Converters under Symmetrical Short-Circuit Fault

Transient Stability Analysis of the Standalone System Constr...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Jiayan Zhang Xinchun Lin Guangzhou Huang Huiqiang Sun Dan Liu Kezheng Jiang Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology State Grid Hubei Electric Power Co. LTD Electric Power Research Institute Wuhan China

With the rapid development of renewable energy, the micro grid and standalone system are greatly penetrated by grid-forming converters which establish the voltage and frequency of the system. The grid-forming converter like the synchronous generator may threaten the standalone system safe and stable operation under large disturbances. Based on that, this paper investigates the transient stability of the standalone system constructed by two paralleled grid-forming converters suffering from symmetrical short-circuit fault. Firstly, the transient model of the standalone system is established. Secondly, based on state-space equations, the transient stable boundary is derived to analyze the impact of circuit parameters and control parameters on the transient stability of the system, which guides the parameter optimization. Furthermore, the optimal selection method of control parameters of grid-forming converters is proposed to improve the transient stability. At last, the effectiveness of analytical results is verified by simulations.

关键词： Power system stability Stability analysis Mathematical models Synchronous generators Circuit stability Circuit faults Transient analysis

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Cathodic Zn underpotential deposition:an evitable degradation mechanism in aqueous zinc-ion batteries

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Science Bulletin 2022年第18期67卷 1882-1889,M0004页

作者： Shaohua Zhu Yuhang Dai Jinghao Li Chumei Ye Wanhai Zhou Ruohan Yu Xiaobin Liao Jiantao Li Wei Zhang Wei Zong Ruwei Chen Guanjie He Dongliang Chao Qinyou An State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materialsand School of Chemistry and MaterialsFudan UniversityShanghai 200433China Christopher Ingold Laboratory Department of ChemistryUniversity College LondonLondon WC1H 0AJUK Electrochemical Innovation Laboratory Department of Chemical EngineeringUniversity College LondonLondon WC1E 7JEUK State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Aqueous zinc-ion batteries(AZIBs)are promising for large-scale energy storage,but their development is plagued by inadequate cycle ***,for the first time,we reveal an unusual phenomenon of cathodic underpotential deposition(UPD)of Zn,which is highly irreversible and considered the origin of the inferior cycling stability of *** experimental and theoretical simulation approaches,we propose that the UPD process agrees with a two-dimensional nucleation and growth model,following a thermodynamically feasible ***,the universality of Zn UPD is identified in systems,including VO_(2)//Zn,TiO_(2)//Zn,and SnO_(2)//*** practice,we propose and successfully implement removing cathodic Zn UPD and substantially mitigate the degradation of the battery by controlling the end-ofdischarge *** work provides new insights into AZIBs degradation and brings the cathodic UPD behavior of rechargeable batteries into the limelight.

关键词： Underpotential deposition Zn metal deposition Zinc-ion battery Aqueous battery Degradation mechanism

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