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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure 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. The contact pressure and area vary with the input current, sharing similar trends, which 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 is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact. © 2024 Eindhoven University of technology.

关键词： Digital elevation model

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Variable dead zone pulse width modulation to reduce conducted electromagnetic interference 2

Variable dead zone pulse width modulation to reduce conducte...

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2nd China Power Supply Society electromagnetic Compatibility Conference, CPEMC 2024

作者： Liu, Hui Jiang, Dong Yan, She 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)9798331509552

—The switching of the switch will produce a lot of electromagnetic interference (EMI). The time scale of the dead zone is very small, and the actual conduction situation is determined by the direction of the current, and therefore affects the EMI at the MHz level. Based on the principle of spread spectrum modulation, a pulse width modulation (PWM) technique with variable dead zone (VDZ) is proposed in this paper. The simulation and experimental results show that the differential mode EMI can be reduced by about 5dB at 600kHz-5MHz by using VDZPWM at a constant switching frequency. ©2024 IEEE.

关键词： Pulse width modulation

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Characterization of on-state resistance of electrically triggered vacuum surface flashover switch 4

Characterization of on-state resistance of electrically trig...

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4th International Conference on Electrical engineering and Control Science, IC2ECS 2024

作者： Fu, Yingjie Dong, Luokang He, Mengbing Liu, Zhengzheng Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798331510107

Electrically triggered Vacuum Surface Flashover Switches (VSFS) are suitable for high voltage and high power conversion applications because of their advantages of high turn-on speed, high insulation recovery speed, small size, and simple structure. Low on-state resistance, which determines the output efficiency of the pulsed power system and its own lifetime, is an important index of high-performance VSFS. In this paper, the variation rule of the on-state resistance of VSFS under square wave current condition and exponential decay current condition and the influencing factors are investigated by experiment. The experimental results show that in the on-state stage, the operating voltage has a greater effect on the VSFS on-state resistance, and the trigger energy have a smaller effect on the VSFS on-state resistance. © 2024 IEEE.

关键词： Flashover

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Power-to-Hydrogen by Electrolysis in Carbon Neutrality: technology Overview and Future Development

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1266-1283页

作者： Zhiyao Zhong Jiakun Fang Kewei Hu Danji Huang Xiaomeng Ai Xiaobo Yang Jinyu Wen Yuan Pan Shijie Cheng the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China. Hitachi Energy Research Hitachi Energy(China)LimitedBeijing 100015China.

Power-to-hydrogen by electrolysis(PtHE)is a promising technology in the carbon-neutral evolution of *** not only contributes to renewable energy integration but also accelerates decarbonization in industrial sectors through green hydrogen *** paper presents a comprehensive review of PtHE ***,technical solutions in PtHE technology are introduced to clarify pros and cons of one ***,the multiphysics coupling and the multi-energy flow are investigated to reveal the insight mechanism during operation of compactly assembled industrial PtHE ***,the development trends of core components in PtHE plants,including electrocatalysts,electrode plates and operation strategy,are reviewed,*** thrusts needed for PtHE in carbon-neutral transition are also ***,three configurations of the PtHE plant in energy system integration are introduced,which can achieve renewable energy integration and efficient energy *** Terms-Carbon neutrality,power-to-hydrogen nby electrolysis(PtHE),multiphysics coupling,multidisciplinary.

关键词： Carbon neutrality power-to-hydrogennby electrolysis(PtHE) multiphysics coupling multidisciplinary.

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A high energy density hybrid EMI filter based on improved MCMC 2

A high energy density hybrid EMI filter based on improved MC...

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2nd China Power Supply Society electromagnetic Compatibility Conference, CPEMC 2024

作者： Li, Shuo Zhang, Junzhao Jiang, Dong Liu, Zicheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331509552

This paper proposes an improved MultiFunction Common Mode Choke (MCMC), and designs a high energy density hybrid EMI filter (HEF). MCMC improves the suppression effect and energy density of the filter by using the Current Transformer (CT) of the active EMI filter (AEF) as the common mode inductor in the passive EMI filter (PEF). By adding inductance to the secondary side of the CT, the improved MCMC strengthens the effective working bandwidth. And the HEF with the improved MCMC, compared to the one with the original MCMC, has significantly better noise suppression effects at both low-frequency and peak noise points, and it also has slight improvements at high frequencies. It is especially suitable for tasks that require higher filter bandwidth. ©2024 IEEE.

关键词： Interference suppression

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Improving aircraft nose wheel steering stability based on control continuation method

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Science China(Technological Sciences) 2025年第3期68卷 258-277页

作者： Qiaozhi YIN Dexu KONG Jiawei WANG Hong NIE Xiaohui WEI National Key Laboratory of Helicopter Aeromechanics Nanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing210016China AVIC Nanjing Engineering Institute of Aircraft Systems Nanjing211106China

Aircraft steering instability during the taxiing process sometimes occurs resulting from the unstable bifurcation phenomena of the nonlinear steering dynamic system,which may lead to severe *** this study,the control parameter design of an aircraft nose wheel steering control system based on the control continuation method is proposed to reduce the number of unstable bifurcation points and enlarge the system stable region area in a certain parameter ***,the aircraft turning performance can be improved ***,a nonlinear aircraft rollout dynamic model is constructed,and the aircraft ground steering bifurcation characteristics are obtained under the open-loop steering control ***,the bifurcation performances under three closed-loop nose wheel steering controllers based on the feedback control method are compared,and the control parameter of the quadratic nonlinear controller with a better bifurcation control effect is selected as a second bifurcation parameter to analyze the directional system stability via two-parameter bifurcation ***,the influence of a crosswind on the aircraft ground steering bifurcation performance is studied for various control parameter ***,the control effects of a traditional proportional-integral-derivative(PID)nose wheel steering control law and the designed feedback controller are compared and ***,a semi-physical experiment of the aircraft nose wheel steering system is carried out,and different control parameter values are selected for test verification,which can further verify the control effect of the designed nonlinear feedback *** results indicate that the feedback control method is unable to vary the system bifurcation types,but appropriate control parameter design can effectively shrink the system instability region and even eliminate the unstable Hopf bifurcation points under some specific working conditions,improving the aircraft ground turning stability re

关键词： aircraft taxiing dynamics and stability nose wheel steering control system control continuation steering bifurcation characteristics quadratic feedback control

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Simultaneously enhancing erosion and compression resistance:designing AlCoCrFeNi high-entropy alloy strengthened Ag-based contacts

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Rare Metals 2024年第9期43卷 4476-4492页

作者： Xiao-Yang Xue Zhe Wang Hui-Ling Nie Zhao Yuan Jun Wang Chang-Hu Xu Kai Wen Cong-Hao Yu School of Materials Science and Engineering Xi’an Polytechnic UniversityXi’an 710048China School of Physics Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Pulsed Power Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Designing microstructures and unveiling dynamic erosion mechanisms remain important challenges for Ag-based *** simultaneously enhance erosion and compression resistance,an Al Co Cr Fe Ni high-entropy alloy(HEA)is introduced into Ag-based materials to fabricate novel Ag-HEA contacts with island-and skeletonrestricted *** arc erosion experimental results reveal that the skeleton-restricted HEA microstructure is the key factor in reducing the hill and crater morphologies of the contact surface,effectively delaying material transfer between the movable and stationary *** molten bridge evolution and compressive deformation behavior of Ag-HEA contacts with various microstructures are investigated using molecular dynamics(MD)*** results indicate that the constraint of Ag atom diffusion in the molten pool and the involvement of HEA atoms in the molten bridge are the primary mechanisms for improving erosion *** skeleton-restricted HEA microstructure reduces the total energy and structural stability of the molten bridge system and promotes its fracture and ***,the synergistic effect of the twin and Lomerz–Cottrell lock structures can hinder dislocation glide,generating dispersed and small-area stacking faults in the Ag matrix and mitigating the concentration of shear ***,the skeleton-restricted HEA microstructure contributes positively to compression *** study presents a novel approach to designing Ag-based contacts.

关键词： Electrical contact materials High entropy alloys Arc erosion Molecular dynamics Microstructures

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The Impact Analysis of Line Inductance on System Amplitude and Frequency Stability in the Converter Interfaced System 6

The Impact Analysis of Line Inductance on System Amplitude a...

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6th International Conference on Power and Energy technology, ICPET 2024

作者： Xu, Qiumeng Wang, Sicheng Yuan, Xiaoming 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)9798350375855

With the transition to cleaner energy sources, a high proportion of renewable devices often needs to be connected to the grid through long transmission lines, which increases the risk of system instability. The system is composed of device and network, both of which have influence on system stability. The impact of device control parameters on system stability has been widely studied, but the impact of network on system stability should not be overlooked. This paper focuses on the line inductance in the network. Firstly, it elucidates the implications of the system Amplitude and Frequency (A&F) stability, considering the dynamic characteristics of both device and the network. Secondly, it analyzes the high-order dynamic characteristics of the inherent relationship between the excitation of the amplitude/frequency of internal voltage and the response of active/reactive current, under the constraints imposed by line inductance in the network. This analysis reveals the essence of the dominant feature of this relationship, which is influenced by the system oscillation frequency. Finally, the system oscillation frequency was analyzed through closed-loop simulation, which affects the A&F stability of the system by affecting the energy storage capacity of the line inductance. This paper establishes a general understanding of the energy storage capacity of line inductor in the grid and lays the foundation for further understanding and analyzing of the mechanism of power system instability problems. © 2024 IEEE.

关键词： Frequency stability

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Photoexcitation-induced passivation of SnO2 thin film for efficient perovskite solar cells

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national Science Review 2023年第11期10卷 183-191页

作者： Nianyao Chai Xiangyu Chen Zhongle Zeng Ruohan Yu Yunfan Yue Bo Mai Jinsong Wu Liqiang Mai Yi-Bing Cheng Xuewen Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

A high-quality tin oxide electron transport layer(ETL) is a key common factor to achieve high-performance perovskite solar cells(PSCs). However, the conventional annealing technique to prepare high-quality ETLs by continuous heating under near-equilibrium conditions requires high temperatures and a long fabrication time. Alternatively, we present a non-equilibrium, photoexcitation-induced passivation technique that uses multiple ultrashort laser pulses. The ultrafast photoexcitation and following electron–electron and electron–phonon scattering processes induce ultrafast annealing to efficiently passivate surface and bulk defects, and improve the crystallinity of Sn O2, resulting in suppressing the carrier recombination and facilitating the charge transport between the ETL and perovskite interface. By rapidly scanning the laser beam, the annealing time is reduced to several minutes, which is much more efficient compared with conventional thermal annealing. To demonstrate the university and scalability of this technique, typical antisolvent and antisolvent-free processed hybrid organic–inorganic metal halide PSCs have been fabricated and achieved the power conversion efficiency(PCE) of 24.14% and 22.75% respectively, and a12-square-centimeter module antisolvent-free processed perovskite solar module achieves a PCE of 20.26%,with significantly enhanced performance both in PCE and stability. This study establishes a new approach towards the commercialization of efficient low-temperature manufacturing of PSCs.

关键词： photoexcitation-induced passivation ultrafast laser carrier management electron transport layer perovskite solar cells

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Isolated Bipolar Modular Multilevel DC-DC Converter with Self-balancing Capability for Interconnection of MVDC and LVDC Grids

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 365-379页

作者： Jinmu Lai Xin Yin Yaoqiang Wang Lin Jiang Zia Ullah Xianggen Yin School of Electrical and Information EngineeringZhengzhou UniversityZhengzhou 450001China Department of Electrical Engineering and ElectronicsUniversity of LiverpoolLiverpoolUK State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Scienceand TechnologyWuhan 430074China

Bipolar medium-voltage DC(MVDC)and lowvoltage DC(LVDC)grids have the advantages of flexible integration of distributed renewable-energy generation and reliable power *** order to achieve voltage conversion,power transfer,and electrical isolation for bipolar MVDC and LVDC grids,a high-power DC-DC converter is ***,this paper proposes an isolated bipolar modular multilevel DCDC converter(BiMMDC)with power self-balancing capability for interconnection of MVDC and LVDC *** proposed BiMMDC consists of two series connected MMCs in the MV stage to configure a bipolar MVDC interface,and interleaved converters combined with a dual-transformer are designed in the LV stage to configure the bipolar LVDC interface and to provide a self-balancing *** circuits of two series-connected MMCs and a dual-transformer with interleaved converters are *** that,operation principles of the proposed BiMMDC are introduced,considering balanced/unbalanced power transfer of bipolar LVDC grid and monopolar shortcircuit or open-circuit faults at MVDC *** control scheme is also presented for the proposed BiMMDC under different operating ***,a Matlab simulation and controller hardware-in-the-loop(CHIL)evaluation results are provided to validate the feasibility and effectiveness of the proposed typology and its operating performance.

关键词： Bipolar DC-DC converter equivalent circuit modular monopolar operation multilevel self-balancing

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