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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xie, Yunlong Yuan, Zhao Chen, Lixue State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620456

Mechanical DC circuit breakers have become an irreplaceable part of flexible DC power grids because of their advantages of high economy, low con-duction impedance, and reliable control. However, the large volume of the charging circuit and the high interruption pressure in low current are still the problems it faces. To address the aforementioned issues, a Coupled Self-charging Mechanical DC Circuit Breaker (CSC-DCCB) is proposed. This innovative solution mitigates the risk of switch arc reignition during the commutation process by incorporating a self-charging circuit. The energy consumption process of metal-oxide varistor will cause the capacitor to complete recharging, and this voltage will be used for the reclosing of the CSC-DCCB. Secondly, the parameter of the CSC-DCCB is optimized to achieve a lower overall capacity of the circuit breaker and the rated voltage of the converter switches, which retains the traditional low conduction loss. Finally, the feasibility of CSC-DCCB is validated through PSCAD, the technical parameters of CSC-DCCB are compared with traditional DCCB, showing that CSC-DCCB has better economic efficiency. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Flexible electronics

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Numerical Study of the Current Density on the Armature and Rail Interface with Dynamic Contact

Numerical Study of the Current Density on the Armature and R...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620791

The electrical contact between the armature and rail is acknowledged as imperfect electrical contact (ImPEC), exhibiting characteristics distinct from bulk behavior. It is important to understand the current distribution of the ImPEC for future design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. Variations in the contact pressure and current density with time are analyzed. The results show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current path changes with the contact area, and the current shifts from the trailing edge to the leading edge over time. Additionally, comparative calculations are performed to analyze current variations under dynamic contact. Results suggest that the current distribution is influenced by magnetic diffusion and forced shifts of current caused by dynamic contact. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Threshold current density

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The analysis and assessment of DC-Link voltage control loop dynamics on the transient synchronization stability of grid-following converters

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Electric Power Systems Research 2025年 247卷

作者： Xie, Chenyang Lin, Xinchun Sun, Huiqiang Wei, Juntian Zhang, Jiayan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The transient synchronization stability of grid-following voltage source converters has been extensively investigated, but most of the previous literature has only studied the transient dynamics of the phase-locked loop (PLL) while ignoring the dynamics of the DC-link voltage control (DVC) loop. When the bandwidths of the PLL and DVC are relatively close to each other, erroneous conclusions will be derived if neglecting the transient influence of the DVC loop. This paper first takes into account the transient dynamics of the DVC loop while applying the improved equal-area criterion (EAC) analysis, which reveals how the DVC loop affects the transient synchronization stability. Then, a fourth-order model considering the DVC dynamics is obtained to quantitatively determine a reasonable range of bandwidth and damping ratio for the DVC loop. Moreover, the extent of the influence of DVC on transient synchronization stability with variation of grid strength is analyzed. © 2025

关键词： Transient analysis

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State-of-art of in situ observations of inclusion agglomeration at steel/Ar and steel/slag interfaces:a review of recent development on experimental and theoretical studies

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Journal of Iron and Steel Research International 2025年第2期32卷 315-333页

作者： Yi Wang Jian-xun Fu Deepoo Kumar Qiang Wang Hong-liang Yang Wang-zhong Mu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden Engineering Materials Division of Materials ScienceDepartment of Engineering Science and MathematicsLuleåUniversity of TechnologyLuleå 97187Sweden Department of Metallurgical Engineering and Materials Science IIT BombayPowaiMumbaiIndia Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina ABB Metallurgy Västerås 72136Sweden

Cleanliness control of advanced steels is of vital importance for quality control of the *** order to understand and control the inclusion removal during refining process in molten steel,its motion behaviors at the multiple steel/gas/slag interfaces have attracted the attention much of metallurgical *** recent development of the agglomeration of non-metallic inclusions at the steel/Ar and steel/slag interfaces has been summarized,and both the experimental as well as theoretical works have been *** terms of in situ observation of high-temperature interfacial phenomena in the molten steel,researchers utilized high-temperature confocal laser scanning microscopy to observe the movement of more types of inclusions at the interface,i.e.,the investigated inclusion is no longer limited to Al_(2)O_(3)-based inclusions but moves forward to rare earth oxides,MgO-based oxides,*** terms of theoretical models,especially the model of inclusions at the steel/slag interface,the recent development has overcome the limitations of the assumptions of Kralchevsky-Paunov model and verified the possible errors caused by the model assumptions by combining the water model and the physical *** but not least,the future work in this topic has been suggested,which could be in combination of thermal physical properties of steels and slag,as well as utilize the artificial intelligence-based methodology to implement a comprehensive inclusion motion behaviors during a comprehensive metallurgical process.

关键词： Inclusion movement Steel/Ar interface Steel/slag interface In situ observation

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Al-F co-doping towards enhanced electrolyte-electrodes interface properties for halide and sulfide solid electrolytes

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Chinese Chemical Letters 2025年第1期36卷 610-617页

作者： Han Yan Jingming Yao Zhangran Ye Qiaoquan Lin Ziqi Zhang Shulin Li Dawei Song Zhenyu Wang Chuang Yu Long Zhang College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Guilin Electrical Equipment Scientific Research Institute Co. Ltd.Guilin 541004China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China

All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy *** these advantages,the commercialization of ASSLBs still faces challenges regarding the electrolyte/electrodes interfaces and growth of Li *** doping is an effective and direct method to enhance the performance of ***,we report an Al-F co-doping strategy to improve the overall properties including ion conductivity,high voltage stability,and cathode and anode ***,the Al-F co-doping enables the formation of a thin Li-Al alloy layer and fluoride interphases,thereby constructing a relatively stable interface and promoting uniform Li *** similar merits of Al-F co-doping are also revealed in the Li-argyrodite *** assembled with these optimized electrolytes gain good electrochemical performance,demonstrating the universality of Al-F co-doping towards advanced SEs.

关键词： Solid electrolytes Li halides Li_(2)ZrCl_(6) Li argyrodites Fluorine doping

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Novel Inertia Control Method with Phase-Locked Error Feedforward in PLL for DFIG-Based WTs

Novel Inertia Control Method with Phase-Locked Error Feedfor...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yu, Jiawei Zhu, Yihua Zhou, Yini Hu, Bo Li, Zheyu Li, Xiaoyu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China 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)9789819620418

The large-scale access of wind power causes a significant reduction in the inertia of the power system, seriously threatening the security and stability of the system frequency. Inertia control methods based on the optimized PLLs provide a solution to the low inertia problem of doubly-fed inductance generator (DFIG)-based wind turbines (WTs), but they still suffer from poor dynamic performance and obvious phase-locked error in steady state. For this reason, a novel inertia control method for DFIG-based WTs is proposed in this paper to support the system frequency with better performance in all aspects. Firstly, an equivalent inertia model is deduced considering the dynamic of control and the reason why modifying PLL can realize inertia response of WT is analyzed. Then, the existing inertia control methods based on optimized PLL is introduced and a novel inertia control method with phase-locked error feed-forward in PLL (pefPLL) is proposed. After that, the inertia characteristics, dynamic performance, and steady state performance of pefPLL and other PLLs are compared. Finally, the superiority of the novel inertia control method with pefPLL is verified by simulations. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Wind turbines

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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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In-situ growth of cross-link NiAl-LDH nanosheets on the inner/outer surfaces of carbon microtubes for anti-corrosive electromagnetic wave absorption

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Journal of Materials Science and technology 2025年 238卷 109-118页

作者： Liu, Rui Liu, Xiao Wu, Lihong Du, Changlong Lv, Haiming Wan, Gengping Xiong, Hualin Yuan, Xiang Wang, Jieping Wang, Guizhen Institute of Electromagnetic Protection Materials and Spectral Innovation Technology State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation School of Materials Science and Engineering Hainan University Haikou570228 China Center for New Pharmaceutical Development and Testing of Haikou Center for Advanced Studies in Precision Instruments Haikou570228 China Key Laboratory of Pico Electron Microscopy of Hainan Province Center for Advanced Studies in Precision Instruments Haikou570228 China

electromagnetic wave (EMW) absorbers with anti-corrosion property are highly desired to enhance the durability of military targets in harsh condition. Herein, cross-link NiAl-layered double hydroxide (NiAl-LDH) nanosheets on the inner/outer surfaces of carbon microtubes (CMTs) are ingeniously constructed through the combination of atomic layer deposition technique and a hydrothermal method. The obtained NiAl-LDH/CMT composite exhibits excellent EMW absorption and corrosion resistance performance. The large internal cavity of CMT significantly enhances impedance matching. The uniform distribution of NiAl-LDH nanosheets on both the inner and outer surfaces of CMT generates numerous heterogeneous interfaces that induce substantial polarization loss. Consequently, at a filler rate of only 5 wt.%, the NiAl-LDH/CMT composite exhibits a minimum reflection loss of −60.2 dB and a maximum effective absorption bandwidth of 5.9 GHz. In addition, the combined high impermeability of CMT and the effective Cl−-trapping ability of NiAl-LDH endows NiAl-LDH/CMT composite with outstanding corrosion protection property in simulated seawater environment. Furthermore, the PO43− anions are effectively incorporated into the NiAl-LDH interlayer via anion exchange, which can further enhance corrosion protection capacity through surface inactivation from slow-release PO43− anions without reducing their EMW absorption performance. In summary, this work can give guidance for the development of efficient anti-corrosion EMW absorption materials. © 2025

关键词： Anodic protection

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Coordinated Control Strategy for Multi Hybrid Active Power Filters

Coordinated Control Strategy for Multi Hybrid Active Power F...

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2025 International Conference on Electrical Automation and Artificial Intelligence, ICEAAI 2025

作者： Wang, Chen Yang, Bo Wu, Yutong Li, Mingshu Li, Xingyang Yin, Jingyuan State Grid Beijing Electric Power Company Beijing China Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan China Shandong Key Laboratory of Advanced Electromagnetic Conversion Technology Jinan China

ISBN: (纸本)9798331506797

With the development of new power systems and power electronics technology, the power system in the 'double high' scenario faces certain challenges in harmonic control. To achieve precise real-time control of harmonics, this article proposes a collaborative control strategy for multi hybrid active power filters (HAPF). Based on Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistor (SiC-MOSFET) novel power components, a modular HAPF was constructed, the active and passive parts were connected through coupling inductance to output effective compensation current. To achieve real-time and accurate detection of harmonics, an adaptive filter is constructed by combining Least Mean Square (LMS) and Least Mean Squared (LMF) method, and adaptively update the weight step size based on the error results. A coupling evaluation index was constructed by introducing the relative gain matrix (RGA), considering the compensation performance, capacity allocation, and coupling effects of each HAPF, the optimal allocation of compensation current for each device is determined. The simulation results showed that the proposed method can accurately detect and compensate for system harmonics through collaborative control of multiple HAPF, thereby improving the power quality of the power system. © 2025 IEEE.

关键词： Adaptive harmonic detection Cooperative Control HAPF Harmonic compensation RGA

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Start-to-end simulation for a compact terahertz free electron laser with a beam chopper system

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Nuclear Science and Techniques 2025年第7期36卷 1-11页

作者： Luo, Rui-Ying Chen, Qu-Shan State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

A thermionic gun is endowed with a long bunch tail, which presents challenges for the compact terahertz free electron laser (FEL) facility at the Huazhong University of Science and technology. Owing to a large energy spread, the tail particles do not contribute to the radiation. In the original design, an x-direction slit is used in the dispersive section of the transport line to remove the tail particles. This paper presents an improved scheme to remove the tail by introducing an RF beam chopper system at the exit of the electron gun, to prevent a significant number of tail particles from entering the linac. The facility remains compact while effectively removing the tail of the bunch. The parameters of the beam chopper system are designed. Bunch parameters and radiation performance are analyzed via a start-to-end simulation. The findings indicate that 43% of the particles can pass through the beam chopper system for subsequent acceleration and transport, which saves the RF power, reduces beam loss in the linac, reduces background noise, and suppresses the sideband instability. Simultaneously, the beam chopper system causes an increase in beam emittance, energy spread, and an offset in the center of the bunch. These effects can be mitigated by a solenoid, linac, and steering coils. The simulation results for the FEL show that the micro-pulse energy is greater than 1.1 μJ in the frequency range of 2.8–9.7 THz, and the maximum micro-pulse energy is 1.28 μJ. © The Author(s), under exclusive licence to China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society 2025.

关键词： Particle beam bunching

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