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Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

Plasma Science and technology 2023年第6期25卷 52-64页

作者：黄仕杰刘毅赵勇徐尤来林福昌李化张钦李柳霞 School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Key Laboratory of Pulsed Power Technology(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074People's Republic of China

High-voltage pulse discharge(HVPD)rock fragmentation controls a plasma channel forming inside the rock by adjusting the electrical parameters,electrode type,*** this work,an HVPD rock fragmentation test platform was built and the test waveforms were *** the effects of temperature,channel expansion and electromagnetic radiation,the impedance model of the plasma channel in the rock was *** parameters and initial values of the model were determined by an iterative computational *** model calculation results can reasonably characterize the development of the plasma channel in the rock and estimate the shock wave *** on the plasma channel impedance model,the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated,and the rock fragmentation effect of the HVPD was analyzed.

关键词： stress wave shock wave plasma channel impedance model rock fragmentation high-voltage pulse discharge

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Energy router interconnection system: A solution for new distribution network architecture toward future carbon neutrality

Energy Conversion and Economics

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Energy Conversion and Economics 2022年第4期3卷 181-200页

作者： Liu, Bin Zhu, Bingzhao Guan, Ziyou Mao, Chengxiong Wang, Dan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Under the background of carbon neutrality, distribution networks are facing many new challenges, including providing higher power supply reliability and power quality, additional power supply forms, and better information sharing. The traditional distribution network has difficulty coping with these challenges;thus, it is imperative to transform the traditional distribution network architecture. An energy router (ER) is a type of intelligent power electronic device, and has the potential to play a great role in the transformation of the distribution network. This paper proposes the basic architecture of an ER interconnection system (ERIS), where multiple ERs are gathered together to play a stronger role. Aiming for two different stages of the transformation process of the distribution network, two types of ERISs are employed for a single prosumer and multiple prosumers, respectively. The equivalent modelling, main control strategies, and energy management schemes of the two types of ERIS are respectively illustrated. Several ERIS simulation cases are investigated, and the results verify the advantages and satisfactory performance of the ERIS. The proposed ERIS provides an effective solution for building a new distribution network to adapt to the new challenges in a future carbon neutral era. © 2022 The Authors. Energy Conversion and Economics published by John Wiley & Sons Ltd on behalf of The Institution of engineering and technology and the state Grid Economic & Technological Research Institute Co., Ltd.

关键词： Network architecture

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Manipulating Interfacial Stability via Preferential Absorption for Highly Stable and Safe 4.6 V LiCoO_(2) Cathode

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Nano-Micro Letters 2025年第8期17卷 95-110页

作者： Long Chen Xin He Yiqing Chen Youmin Hou Yujie Zhang Kangli Wang Xinping Ai Yuliang Cao Zhongxue Chen Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072People’s Republic of China

Elevating the upper cutoff voltage to 4.6 V could effec-tively increase the reversible capacity ofLiCoO_(2)(LCO)cathode,whereas the irreversible structural transition,unstable electrode/electrolyte interface and potentially induced safety hazards severely hinder its industrial *** a robust cathode/electrolyte interface film by electrolyte engineer-ing is one of the efficient approaches to boost the performance of high-voltage LCO(HV-LCO);however,the elusive interfacial chemistry poses substantial challenges to the rational design of highly compatible ***,we propose a novel electrolyte design strategy and screen proper solvents based on two factors:highest occupied molecular orbital energy level and LCO absorption ***(2,2,2-trifluoroethyl)phosphate is determined as the optimal solvent,whose low defluorination energy barrier significantly promotes the construction of LiF-rich cathode/electrolyte interface layer on the surface of LCO,thereby eventually suppresses the phase transition and enhancesLi+diffusion *** rationally designed electrolyte endows graphite||HV-LCO pouch cells with long cycle life(85.3%capacity retention after 700 cycles),wide-temperature adaptability(-60–80℃)and high safety(pass nail penetration).This work provides new insights into the electrolyte screening and rational design to constructing stable interface for high-energy lithium-ion batteries.

关键词： Electrolyte design LiF-rich interface Wide-temperature High-safe 4.6 V LCO

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Simplified Time-Domain Design Methodology for LLC Resonant Converter in EV Charging Station Application 3

Simplified Time-Domain Design Methodology for LLC Resonant C...

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3rd International Conference on Power Systems and Electrical technology, PSET 2024

作者： Yuan, Ye Xu, Lin Yao, Chuan Yuan, Jialing Wang, Xuehua Ruan, Xinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9798350353204

LLC resonant converter featuring excellent soft-switching characteristic has been widely used in electric vehicle (EV) charging stations and other applications requiring isolated voltage conversion. The Fundamental Harmonic Approximation (FHA) model has been widely used in the field of resonant converter due to its simple and intuitive characteristics. When the switching frequency deviates from the resonant frequency, the method no longer maintains high accuracy. In this paper, a more accurate parameter design method based on the simplified time-domain model is proposed, considering the load characteristic of the charging stations. Finally, the simulation model verifies that the simplified design method has higher accuracy in predicting voltage gain. Meanwhile, the resonant tank parameters designed based on this method make the converter more efficient in situations where voltage and frequency vary across a wide range. © 2024 IEEE.

关键词： Resonant converters

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electromagnetic Performance Analysis of Homopolar Inductor Alternator with Radial Externally Movable Permanent Magnets 18th

Electromagnetic Performance Analysis of Homopolar Inductor A...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Liu, Zhijian Guo, Cheng Zhang, Ming Rao, Bo Sun, Xiangfei Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819714193

This article proposes a homopolar inductor alternator with a permanent magnet that can move radially outward. The motor has lower no-load electromagnetic losses under idle operating conditions, which can effectively increase the efficiency of the flywheel energy storage system. This article introduces the structure of this motor and analyzes the operating principle of this motor. As the distance between permanent magnet and motor stator is different, the magnetic field strength in the main magnetic circuit of motor is different, and the magnetic field of motor can be adjusted by adjusting the radial displacement of permanent magnet. Finally, the theoretical calculation results were verified using finite element simulation. The simulation results show that the proposed mechanical magnetic induction motor has very low no-load iron loss under idle operating conditions. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Permanent magnets

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Analysis of electromagnetic Performance of a Pulsed HIA with Novel Compensating Winding 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Liu, Zhijian Guo, Cheng Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819713516

ISBN: (纸本)9789819713509

This article proposes a homopolar inductor alternator (HIA) with a special compensation winding, which is a three-phase winding and has twice the number of poles as a regular armature winding. Two methods can be used: passive compensation and active feeding. This article uses finite element simulation (FEM) to verify the effectiveness of the compensation-type HIA proposed in this article, and compares the compensation effects of passive compensation and active feeding. The research results in this paper show that both passive compensation and active feeding compensation can improve the charging power and motor power density, and the active feeding compensation effect is better. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Feeding

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Modeling and Analysis of DFIG-WT-Dominated Power Systems in electromagnetic Timescale Considering Negative Sequence Control

Modeling and Analysis of DFIG-WT-Dominated Power Systems in ...

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2024 IEEE Sustainable Power and Energy Conference, iSPEC 2024

作者： Guo, Zeren Zhu, Jianhang Hu, Jiabing Zhao, Guojie Wu, Zefei Du, Buyang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China The University of Hong Kong Department of Electrical and Electronic Engineering Hong Kong

ISBN: (纸本)9798350395075

The requirement for negative sequence control introduces time-varying coupling between the positive and negative sequences in a doubly fed induction generator (DFIG). The potential risk of electromagnetic oscillation in DFIG-based wind turbine (WT)-dominated power systems (DFIG-WTPS) necessitates small-signal modeling and stability analysis considering time-varying characteristics. However, the traditional linear time-invariant (LTI) modeling method based on Park transformation is no longer suitable. Therefore, this paper applies the linear time-periodic (LTP) modeling method based on trajectory linearization to the small-signal modeling of DFIG- WTPS in electromagnetic timescale. Floquet theory is further introduced to calculate the L TP eigenvalues. Then, the influence of series capacitor and control parameters on small-signal stability is analyzed. Finally, the results from the nonlinear DFIG- WTPS model demonstrate the effectiveness of the proposed analysis. © 2024 IEEE.

关键词： Eigenvalues and eigenfunctions

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Analysis of Repetition Capacitor Charge System Based on Permanent Magnet Excited Homopolar Inductor Alternator 18th

Analysis of Repetition Capacitor Charge System Based on Perm...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

ISBN: (纸本)9789819713509

This article proposes a capacitor charging pulse power supply based on a permanent magnet excitation homopolar inductor generator (HIG). Compared with ordinary HIG, it does not require an external excitation power supply, and has the advantages of a simpler system and no excitation loss in the motor. And a mechanical magnetic adjustment method was adopted to reduce iron loss during no-load operation. The average value analysis model of the power supply system was analyzed, and it was pointed out that the difference between the permanent magnet excitation induction motor and the ordinary induction motor model lies in the different values of the equivalent internal inductance. The equivalent inductance of the permanent magnet excitation HIG is related to the dq axis inductance value, while the equivalent inductance of the ordinary HIG is related to the transient dq axis inductance value. The correctness of the average-value model was verified through finite element simulation, and the effectiveness of the magnetic adjustment ring was verified, which can significantly reduce the no-load iron loss of the motor. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Permanent magnets

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Deformation Evolution and Perceptual Prediction for Additive Manufacturing of Lightweight Composite Driven by Hybrid Digital Twins

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Chinese Journal of Mechanical engineering 2024年第5期37卷 94-112页

作者： Jinghua Xu Linxuan Wang Mingyu Gao Chen Jia Qianyong Chen Kang Wang Shuyou Zhang Jianrong Tan Shaomei Fei State Key Lab of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China Zhejiang Key Lab of Advanced Manufacturing Technology School of Mechanical EngineeringZhejiang UniversityHangzhou 310058China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Institute of Design Engineering Zhejiang UniversityHangzhou 310058China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore City 639798Singapore

This paper proposes a deformation evolution and perceptual prediction methodology for additive manufacturing of lightweight composite driven by hybrid digital twins(HDT).In order to improve manufacturing quality of irregular lightweight composite through boosting conceptual design in aeronautic and aerospace engineering,the HDT meaning hybridization of physical and digital domains,including deformation and energy efficiency can be built,where the essential parameters can be perceptually predicted in advance,by virtue of the fusion of physical sensors and digital *** long short term memory(LSTM)can be employed to void vanishing gradient problem and improve predicting precision via Recurrent Neural Networks,thereby laying a foundation for the *** diverse manufacturing requirements of different regions are integrated into the parameters designing phase by attaching region weights confirmed via empiricism and in-service *** effects of slicing strategy and external support structures on manufacturing quality are considered from the perspective of improving dimensional *** manufacturing efficiency and comprehensive costs are accounted as consideration factors,which are perceptually predicted via *** designed manufacturing parameters through HDT were virtually examined by evaluating the deformation and equivalent stress distributions of fabricated lightweight component with composite material through AM process *** physical experiments were conducted to verify the HDT-based pre-designing and optimization method of manufacturing parameters via fused deposition modeling(FDM).The energy consumption of actual manufacturing process was measured via digital power meter and applied to evaluate accuracy of perceptual prediction *** dimensional accuracy and distortion distribution of the manufactured lightweight prototype made with composite material were measured through the coordinate measuring machine(CMM)and 3D optica

关键词： Deformation evolution Perceptual prediction Lightweight composite Hybrid digital twins(HDT) Long short term memory(LSTM)

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Anion-Regulated Weakly Solvating Electrolytes for High-Voltage Lithium Metal Batteries

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Energy & Environmental Materials 2023年第6期6卷 259-265页

作者： Zhipeng Jiang Jisheng Mo Chen Li Haiwen Li Qingan Zhang Ziqi Zeng Jia Xie Yongtao Li School of Materials Science and Engineering&Low-Carbon New Materials Research Center Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education Anhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hefei General Machinery Research Institute Hefei 230031China

Development of advanced high-voltage electrolytes is key to achieving high-energy-density lithium metal batteries(LMBs).Weakly solvating electrolytes(WSE)can produce unique anion-driven interphasial chemistry via altering the solvating power of the solvent,but it is difficult to dissolve the majority of Li salts and fail to cycle at a cut-off voltage above 4.5 ***,we present a new-type WSE that is regulated by the anion rather than the solvent,and the first realize stable cycling of dimethoxyethane(DME)at 4.6 V without the use of the“solvent-in-salt”*** relationships between the degree of dissociation of salts,the solvation structure of electrolytes,and the electrochemical performance of LMBs were systematically *** found that LiBF_(4),which has the lowest degree of dissociation,can construct an anion-rich inner solvation shell,resulting in anion-derived anode/cathode *** to such unusual solvation structure and interphasial chemistry,the Li-LiCoO_(2)full cell with LiBF_(4)-based WSE could deliver excellent rate performance(115 mAh g^(-1)at 10 C)and outstanding cycling stability even under practical conditions,including high loading(10.7 mg cm^(-2)),thin Li(50μm),and limited electrolyte(1.2μL mg^(-1)).

关键词： high-voltage LiCoO_(2) lithium metal batteries solvation structure weakly solvating electrolyte

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