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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

作者： Shunan Zhou Hua Lin Shaojie Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

This article elaborates the stability analysis of the grid-forming (GFM) voltage-source converters (VSCs) with the single-loop voltage-magnitude (SLVM) control and the virtual resistor. It is revealed that the virtual resistor can greatly change the stability region of the SLVM controlled VSCs, even it is mainly used to eliminate the synchronous resonance introduced by the power control. The mathematical model is then derived, from which the stability region can be analytically obtained. Simulations and experiments validate the theoretical analysis.

关键词： Resistors Power control Resonant frequency Power system stability Stability analysis Mathematical models Resonance Voltage control Grid forming Voltage-source converters

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Optimal Pole Ratio of Spoke-type Permanent Magnet Vernier Machines for Direct-drive Applications

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CES Transactions on Electrical Machines and Systems 2022年第4期6卷 454-464页

作者： Yu Zhao Dawei Li Xiang Ren Ronghai Qu Jianbo Sun Ping Yu the State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China IEEE the Jing-Jin Electric Technology (Zhengding) Co. Ltd

Due to magnetic gearing effects,spoke-type permanent magnet vernier machines(ST-PMVMs)have the merit of high torque density,where an extra torque amplification coefficient,i.e.,pole ratio(the pole-pair ratio of PMs to armature windings)is ***,different from surface-mounted PMVM,the variation of torque against pole ratio in ST-PMVMs is non-linear,which is increased at first and then *** article is devoted to identify the optimal pole ratio of ST-PMVMs by equivalent magnetic circuit *** is found that except the Prth air-gap magnetomotive force(MMF)harmonic having the same pole-pair of PM,the Path air-gap MMF harmonic having the same pole-pair of armature winding is also induced due to the modulation of doubly salient air-gap *** Prth MMF harmonic produces positive torque,while Path MMF harmonic produces negative *** the increase of pole ratio,the proportion of Path MMF harmonic as well as negative torque is increased,which reduces the advantages of high pole ratio ***,the influence of dimension parameters on the performance of ST-PMVMs under different pole ratio are *** show that ST-PMVMs with pole ratio 2.6 have high torque density,low cogging torque and high power factor ***,a prototype is manufactured to validate the analysis.

关键词： Spoke-type permanent magnet machines(ST-PMVMs) Pole ratio Back electromagnetic force(EMF)and torque capability

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Transient Process Analysis of Grid-Forming Converter under Severe Voltage Sags with Different Q-V Controllers 2

Transient Process Analysis of Grid-Forming Converter under S...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Xie, Chenyang Lin, Xinchun Sun, Huiqiang Zhang, Jiayan Wei, Juntian Fang, Tianyu Liu, Dan Jiang, Kezheng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Electric Power Research Institute State Grid Hubei Electric Power Co. LTD Wuhan China

ISBN: (纸本)9798350359428

Grid-forming VSCs based on Virtual Synchronous Generator (VSG) control strategy provide primary frequency regulation and voltage support for weak grids or VSC-dominated grids. Analyzing the transient stability of VSG-VSCs under large disturbances is useful for maintaining the security of the grid. However, different control strategies in grid-forming converters will cause the VSC to operate at different transient processes, and this topic is little studied. In this paper, the impacts of Q-V controller on transient process under severe voltage drops are elaborately studied. In particular, it is shown that the change of controller will change the transient process of the VSC, which impacts the transient stability of VSG-VSCs. Simulations verify the validity of the transient stability analysis. © 2023 IEEE.

关键词： Controllers

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A Molecular Dynamics Study on the Influence of Atmosphere on the Characteristics of Thermal Decomposition Products of Cross-Linked Epoxy Resins in Composite Insulators 18th

A Molecular Dynamics Study on the Influence of Atmosphere on...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Zhiyu, Wan Dandan, Zhang Chao, Gao Ming, Lu Zhenbiao, Li Junjie, Lin Yuwei, You Ziheng, Huang Luqing, Cheng Zehong, Wang School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Henan Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology State Grid Henan Electric Power Research Institute Zhengzhou450052 China

ISBN: (纸本)9789819713509

The degradation of the epoxy resin matrix, triggered by partial discharges within composite insulators, is a prominent phenomenon in decay-like fracture incidents. The decomposition products of epoxy resins could significantly influence the further progression of these incidents. This study establishes crosslinked and non-crosslinked models of epoxy resin molecules, employing molecular dynamics methods to investigate the characteristics of the thermal decomposition products of epoxy resins within composite insulators. The effects of an oxygen atmosphere and a crosslinking network on the properties of pyrolysis small molecule products are also examined. Results demonstrated that the introduction of oxygen notably impacts the thermal decomposition products of small molecules, leading to an increase in CO2 and H2O yields, with no significant effect on CH2O yield. The presence of oxygen also results in an increase in the types and quantities of C2 and C3 products, particularly oxygen-containing compounds. Compared to non-crosslinked epoxy resins, the impact of oxygen on CO2 yield during the thermal decomposition process of crosslinked epoxy resins is relatively minor, but its effect on H2O yield is more substantial. Furthermore, regardless of the presence or absence of oxygen, the types of C2 and C3 products from crosslinked epoxy resins are fewer, implying that the crosslinking network limits intermolecular freedom, thereby resulting in enhanced oxidation reaction capabilities and more stable chemical reaction behaviors. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Molecular dynamics

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Improvement of stability and solid-state battery performances of annealed 70Li_(2)S–30P_(2)S_(5) electrolytes by additives

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Rare Metals 2022年第1期41卷 106-114页

作者： Hao-Tian Ren Zi-Qi Zhang Jun-Zhao Zhang Lin-Feng Peng Zhen-Yuan He Ming Yu Chuang Yu Long Zhang Jia Xie Shi-Jie Cheng 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 School of Physics Huazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China

The replacement of liquid electrolyte with solid electrolyte can significantly improve the safety and power/energy density of lithium batteries.70Li_(2)S–30P_(2)S_(5) is one of the most promising solid electrolytes with high conductivity for solid–state *** this work,the ionic conductivity and stability toward moisture and lithium metal of 70Li_(2)S–30P_(2)S_(5) were enhanced by introducing the different amounts of Li_(2)O additives.65Li_(2)S–30P_(2)S_(5)–1%Li_(2)O delivered the highest conductivity,while 65Li_(2)S–30P_(2)S_(5)–5%Li_(2)O showed the best moisture stability and improved lithium ***-state batteries using 65Li_(2)S–30P_(2)S_(5)–5%Li_(2)O electrolyte and high-voltage LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2) cathode exhibited low initial discharge capacity(100 mAh·g^(-1))and Coulombic efficiency(69%).Li_(3)InCl_(6) electrolytes were introduced both in the cathode mixture to replace sulfide electrolyte and in the interface layer to improve the cathode compatibility for the solid-state batteries,showing enhanced discharge capacity(175 mAh·g^(-1))and improved initial Coulombic efficiency(86%).Moreover,it also exhibited good performance at-20℃.

关键词： Solid electrolyte 70Li2S–30P2S5 Stability Additives Solid-state batteries

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Enhancing the TRIP Effect by Pre-Ferrite in the Hot Rolled Fe-8Mn-4Ni-3Al-0.1C Steel

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ISIJ International 2025年第4期65卷 571-575页

作者： Zhang, Linfeng Matsugi, Kazuhiro Xu, Zhefeng Choi, Yongbum Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima739-8527 Japan State Key Laboratory of Metastable Materials Science and Technology Yanshan University No. 438 Hebei Street Qin Huangdao066-000 China

As is well known, reconstruction of the initial microstructure before an inter-critical annealing (IA) can optimize the final microstructure as well as improve mechanical performance. In this study, the initial microstructure with "pre-ferrite + martensite" was designed via two-stage cooling in the rolling process. The final microstructure observation showed that bimodal size distributed austenite and double morphologies of austenite. Moreover, lath-shaped austenite existed in the martensitic matrix;blocky austenite occurred at the boundaries of pre-ferrite. According to the numerical simulations of the IA process, blocky austenite tended to be more stable with smaller size and higher Mn concentrations than lath-shaped austenite. The characteristics of austenite were similar at different IA temperatures, but the lower IA temperatures, the smaller size of austenite. An excellent combination of strength (1 308 MPa) and ductility (34%) was obtained at 928 K, which was ascribed to a positive TRIP effect induced by the austenite with a large stability gradient. © 2025 The Iron and Steel Institute of Japan.

关键词： Ductility

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On the chronological understanding of the homogeneous dielectric barrier discharge

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High Voltage 2023年第6期8卷 1132-1150页

作者： Xinpei Lu Zhi Fang Dong Dai Tao Shao Feng Liu Cheng Zhang Dawei Liu Lanlan Nie Chunqi Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina College of Electrical Engineering and Control Science Nanjing Tech TechnologyNanjingChina School of Electric Power South China University of TechnologyGuangzhouChina Institute of Electrical Engineering Chinese Academy of SciencesBeijingChina Frank Reidy Research Center for Bioelectrics Old Dominion UniversityNorfolkVirginiaUSA Department of Electrical and Computer Engineering Old Dominion UniversityNorfolkVirginiaUSA

Dielectric barrier discharges(DBD)are widely utilised non‐equilibrium atmospheric pressure plasmas with a diverse range of applications,such as material processing,surface treatment,light sources,pollution control,and *** the course of several decades,extensive research has been dedicated to the generation of homogeneous DBD(H‐DBD),focussing on understanding the transition from H‐DBD to filamentary DBD and exploring strategies to create and sustain H‐*** paper first discusses the in-fluence of various parameters on DBD,including gas flow,dielectric material,surface conductivity,and mesh ***,a chronological literature review is presented,highlighting the development of H‐DBD and the associated understanding of its un-derlying *** encompasses the generation of H‐DBD in helium,nitrogen,and ***,the paper provides a brief overview of multiple‐current‐pulse(MCP)behaviours in H‐*** objective of this article is to provide a chronological un-derstanding of homogeneous dielectric barrier discharge(DBD).This understanding will aid in the design of new experiments aimed at better comprehending the mechanisms behind H‐DBD generation and ultimately assist in achieving large‐volume H‐DBD in an air environment.

关键词： dielectric barrier pollution

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Design of Pulse Power Supply for Nonlinear Kicker of Synchrotron Radiation Light Source 4

Design of Pulse Power Supply for Nonlinear Kicker of Synchro...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Zhu, Bing She, Jiahao Liu, Yuan Wang, Xulong Li, Xiaofei Yang, Jun Fan, Kuanjun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9798350305562

Synchrotron radiation light source has evolved into the fourth generation of diffraction-limited storage ring sources. Off-axis injection is a common approach at many leading international light sources, with the core element being Nonlinear Kicker (NLK). The pulse power supply is a critical component for ensuring the proper operation of NLK. This paper focuses on the design of pulse power supplies for NLK used in synchrotron light sources, using the off-axis injection NLK at the 1.5 GeV low-energy ring of Wuhan Light Source as a case study. The study employs Matlab/Simulink simulation to analyze the impact of various parameters on the output current of pulse power supply. The outcome of this study culminated in the design of a pulse power supply featuring a pulse current amplitude of 5440 A and a pulse width of 1 μs. © 2023 IEEE.

关键词： Light sources

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Modeling and Control of a High-power DC-DC Hydrogen Converter Based on DC Grid

Modeling and Control of a High-power DC-DC Hydrogen Converte...

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

作者： Rui Zhou Fei Xiao Jilong Liu Shanxu Duan Yufan Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China National Key Laboratory of Electromagnetic Energy Naval University of Engineering Wuhan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Water electrolysis hydrogen generation is considered as a prospective solution to the problem of the renewable energy sources (RES) absorption. To expand the capacity of the high-power hydrogen production system, the hydrogen converter based on the medium-voltage DC bus (MVDCB) is a key equipment. An isolated modular converter is designed in this paper, which can achieve the high step-down ratio, electrical isolation, low output current ripple, high efficiency, and fault isolation capabilities. Considering the dynamic characteristics of proton exchange membrane water electrolyzer (PEMWE) coupled with RES, the modelling method and control strategy are studied by combining the equivalent dynamic electrical models of PEMWE. Finally, the control strategy is verified by simulation.

关键词： Water Protons Renewable energy sources Production systems Hydrogen Medium voltage Circuit faults

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从废旧电池中直接提取锂实现锂的高效回收

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Science Bulletin 2024年第11期69卷 1697-1705页

作者：刘威刘猛闯马纷纷覃明盛钟伟陈忻曾子琪程时杰谢佳 State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China GuSu Laboratory of Materials Suzhou 215123China Suzhou Laboratory Suzhou 215123China

The flourishing expansion of the lithium-ion batteries(LIBs) market has led to a surge in the demand for lithium resources. Developing efficient recycling technologies for imminent large-scale retired LIBs can significantly facilitate the sustainable utilization of lithium resources. Here, we successfully extract active lithium from spent LIBs through a simple, efficient, and low-energy-consumption chemical leaching process at room temperature, using a solution comprised of polycyclic aromatic hydrocarbons and ether solvents. The mechanism of lithium extraction is elucidated by clarifying the relationship between the redox potential and extraction efficiency. More importantly, the reclaimed active lithium is directly employed to fabricate LiFePO_(4) cathode with performance comparable to commercial materials. When implemented in 56 Ah prismatic cells, the cells deliver stable cycling properties with a capacity retention of ~90% after 1200 cycles. Compared with the other strategies, this technical approach shows superior economic benefits and practical promise. It is anticipated that this method may redefine the recycling paradigm for retired LIBs and drive the sustainable development of industries.

关键词： Retired lithium-ion batteries Lithium recycling Chemical leaching Active lithium Lithium iron phosphate

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