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Schlieren techniques for observations of long positive sparks:Review and application

High Voltage 2022年第5期7卷 825-839页

作者： Junjia He Xiankang Wang Xiangen Zhao Juhyeong Lee Yaping Du Xiaopeng Liu Quan Gan Yang Liu Yuqin Liao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Department of Building Environment and Energy Engineering Hong Kong Polytechnic UniversityKowloonChina Department of Mechanical and Aerospace Engineering Utah State UniversityLoganUtahUSA

Understanding the mechanism of positive leader discharge is important in lightning protection engineering and the external insulation design in high voltage power transmission *** the propagation of a positive leader,some processes without light-emitting,for example,the insulation recovery process after the breakdown,cannot be observed by optical photography *** the combination of the digital high-speed imaging system,the conventional Schlieren techniques offer new vistas in the long air gap discharge *** important features of high spatial resolution,high sensitivity,and easy arrangement make Schlieren techniques powerful and effective tools for characterising the discharge processes without *** work presents a brief review of current Schlieren techniques and discusses the design of the Schlieren optics system for long spark *** interesting phenomena discovered at different phases of long sparks with high-speed Schlieren techniques are also presented.

关键词： insulation system positive

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Transient Stability Assessment and Dynamic Security Region in Power Electronics Dominated Power Systems 13

Transient Stability Assessment and Dynamic Security Region i...

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2022 IEEE International Conference on Power Systems technology, POWERCON 2022

作者： Ma, Rui Zhan, Meng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665417754

ISBN: (纸本)9781665417754

Transient stability accidents induced by converter-based resources have been emerging frequently around the world. In this paper, the transient stability of the grid-tied voltage source converter (VSC) system is studied through estimating the basin of attraction (BOA) based on the hyperplane or hypersurface method. Meanwhile, fault critical clearing times are estimated, based on the approximated BOA and numerical fault trajectory. Further, the dynamic security region (DSR), an important index in traditional power systems, is extended to power-electronics-dominated power systems in this paper. The DSR of VSC is defined in the space composed of active current references. Based on the estimated BOA, the single-VSC-infinite-bus system is taken as an example and its DSR is evaluated. Finally, all these analytical results are well verified by several numerical simulations in MATLAB/Simulink. © 2022 IEEE.

关键词： Power electronics

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Method to Detect Arc Across Pantograph-Catenary Structure Atop Train Based on Frequency Features of Entry Current 1

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6th International Conference on Electrical engineering and Information Technologies for Rail Transportation, EITRT 2023

作者： Du, Yufei Jiao, Yang Zhu, Yongzheng Chen, Jun Li, Hongbin Chen, Qing Institute of Artificial Intelligence Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronics Engineering 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

ISBN: (数字)9789819993192

ISBN: (纸本)9789819993185

During a train running at speed, the pantograph-catenary structure atop the train would be influenced by many factors, resulting in disconnections. A timely detection on arcs across this structure helps to guide works on real-time operating and later maintenance, to eliminate latent factors of disconnection. A theory on the generation of arcs is researched, simulated, and verified with practical data. Two features of entry current, in frequency bands at kHz degree and at harmonic-Hz degree, are picked for the detection. Based on the discrepancy on these bands while arcing and normally running, a model of support vector machine (SVM) is constructed. Existing signals on train are processed and rearranged to be datasets for training SVM. After applying it to a practical railway, the results illustrate: the accuracy on arc detections is up to 99.96%. With guidance from results, an on-site investigation was launched, and mark of flaming was found at corresponding location of catenary, which verified the correctness. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Pantographs

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Optimal Voyage Scheduling of Battery-Swapping Based Inland All-Electric Ship Fleet Considering Environmental Factors and Time-of-Use Electricity Price

Optimal Voyage Scheduling of Battery-Swapping Based Inland A...

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

作者： Shenglong Yang Fan Ma Haishun Sun Lin Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) National Key Laboratory of Electromagnetic Energy (Naval University of Engineering) Wuhan China 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

Inland all-electric ship is receiving more and more attention due to its advantages in terms of low carbon, energy conservation, and flexibility in operation mode. However, its extensive promotion and application are held back by various problems such as long charging time, high cost of energy supplement, environmental factors, etc. In addition, the complexity of the electric ship fleet also poses a challenge to its optimal operation. Hence, an optimal voyage scheduling model of the inland all-electric ship fleet, with departure time and speed of each ship as the decision variables, is firstly established to minimize the total battery-swapping cost and the total waiting time in this paper. Based on the battery-swapping mode, the model takes environmental factors and time-of-use electricity prices into account. Second, adaptive particle swarm optimization is used to solve the proposed model, and the comparative analysis is made. Finally, an all-electric ship fleet operating in the Yangtze River is selected as a study case, and the simulation results show that the proposed model can effectively reduce the total battery-swapping cost and the total waiting time.

关键词： Adaptation models Costs Electricity Simulation Environmental factors Rivers Power systems

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Post-Disaster Scheduling Strategy of Island Microgrid with Electric Passenger Ships 4

Post-Disaster Scheduling Strategy of Island Microgrid with E...

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4th International Conference on Power and Energy technology, ICPET 2022

作者： Wu, Chuantao Ma, Yuncong Chen, Cen Sun, Chengcheng Lin, Xiangning Wei, Fanrong Li, Zhengtian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

Island microgrids (IMGs) are usually interconnected with the mainland grid by submarine cables. However, once the submarine cable suffers damage, the IMGs will rely on standby diesel units to operate independently with the poor economy and severe pollution. This paper proposes a post-disaster collaborative scheduling strategy for IMG and electric passenger ships (EPS) to address this problem. Firstly, based on the idea of hierarchy-clustering-decoupling, a novel EPS scheduling model is proposed to speed up the solving efficiency. Then, a two-stage post-disaster scheduling strategy is presented with the operating constraints of IMGs. The first stage optimally determines the IMG scheduling plan and the EPS cluster scheduling plan, and the second stage makes decisions on individual EPS scheduling plans. Finally, the numerical simulation verifies the effectiveness of the proposed strategy and the rapidity of the solution. © 2022 IEEE.

关键词： Scheduling

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Chinese Chemical Letters 2024年第8期35卷 25-35页

作者： Yatian Deng Dao Wang Jinglan Cheng Yunkun Zhao Zongbao Li Chunyan Zang Jian Li Lichao Jia School of Materials Science and Engineering State Key Lab of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Science Qiongtai Normal UniversityHaikou 571127China Kunming Sino-Platinum Metals Catalyst Co. Ltd.Kunming 650106China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074China

Catalyst with high performance has drawn increasing attention recently due to its significant advantages in chemical reactions such as speeding up the reaction,lowering the reaction temperature or pressure,and proceeding without itself being *** the superior catalytic performance of precious metal catalysts,transition metal oxides offer a promising route for substitution of precious metals in catalysis arising from their low cost,intrinsic activity and sufficient ***-type oxide SmMn_(2)O_(5) exhibits a unique crystal structure containing double crystalline fields,and nowadays is used widely as the catalyst in different chemical reactions,including the reactions of vehicle emissions reduction and oxygen evolution reaction,gas sensors,and metal-air batteries,promoting attention in catalytic perfor-mance *** our knowledge,there is no review article covering the comprehensive informa-tion of SmMn2 O 5 and its *** we review the recent progress in understanding of the crys-tal structure of SmMn_(2)O_(5) and its basic physical *** then summarize the catalytic sources of SmMn_(2)O_(5) and reaction mechanisms,while the strategies to improve catalytic performance of SmMn_(2)O_(5) are further ***,we provide a perspective on how to make further progress in catalytic applications.

关键词： Catalyst SmMn_(2)O_(5) Mullite-type oxide Catalytic oxidation Oxygen reduction reaction Oxygen evolution reaction Reaction mechanisms

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Analysis of End Effect on Thrust Ripple in Linear Brushless Doubly-Fed Machine

Analysis of End Effect on Thrust Ripple in Linear Brushless ...

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2022 International Electrical engineering Congress, iEECON 2022

作者： Ge, Jian Xu, Wei Bao, Zhen Zhang, Yaping Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665402064

The linear brushless doubly-fed machine (LBDFM) as a novel type of machine has attracted extensive attention in recent years. Due to the complex magnetic fields and end effect, there is rich low-frequency thrust ripple in LBDFM. In order to make the physical process of thrust ripple clear, the end effect on the winding magnetomotive force (MMF) is studied. Firstly, the shifted slot vector affected by the end is obtained. Then, a negative sequence magnetic motive force is analyzed with the certain winding configuration. Finally, the generation of low-frequency thrust ripple is explained. The analysis results are verified by finite element algorithm (FEA) and the proposed method can be applied to most linear machines with short primary. © 2022 IEEE.

关键词： Winding

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In Situ Utilization of Martian Resources: Advances and Prospects in Plasma technology

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ACS Sustainable Chemistry & engineering 2025年第22期13卷 8406-8423页

作者： Haiwei Zhu Shihao Tan Cuntao Lan Dawei Liu Xinpei Lu State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China

In situ resource utilization (ISRU) is essential for sustainable Mars exploration due to the high cost and complexity of Earth-based supply chains. Mars’ harsh environment─marked by a thin CO2-rich atmosphere, extreme temperature swings, dust storms, and high radiation─poses significant challenges for conventional processing. Plasma technologies, known for their high energy density, chemical reactivity, and operational flexibility, offer promising solutions. This review examines recent advances in nonthermal plasma systems for key ISRU tasks, including CO2decomposition for oxygen and fuel production, water extraction from hydrated minerals, and regolith sintering for habitat construction. Special attention is given to microwave and dielectric barrier discharge plasmas, which have shown enhanced oxygen yield and energy efficiency compared to traditional systems like NASA’s MOXIE. Spark plasma sintering is also highlighted for its potential in producing high-strength ceramics from Martian soil. Despite technical promise, deployment challenges remain, including thermal stress resistance, dust mitigation, and energy optimization. Strategies such as advanced material selection, self-cleaning surfaces, and integration with renewable energy are proposed to improve system resilience. Beyond Mars, these plasma technologies have strong potential for Earth-based applications including CO2valorization, decentralized water treatment, and low-energy waste recycling. By bridging extraterrestrial and terrestrial needs, plasma-driven ISRU represents a dual-use innovation platform for advancing sustainable engineering under extreme constraints.

关键词：

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Dielectric Mechanism and Spectrum Prediction Model for Insulating Paper Based on Three-Dimensional Frequency-Domain Spectroscopy

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Liu, Ruiqi Wang, Shengkang Lin, Fuchang Li, Hua Ministry of Education State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Moisture is a serious concern for transformers, as it will degrade insulation properties and accelerate aging. The dielectric mechanisms of oil-immersed paper (OIP) and the influence of moisture still remains contentious in existing studies, which prevents the application of Frequency-Domain Spectroscopy (FDS) technology in moisture assessment of transformers. OIP is a biphasic composite material composed of oil and paper, and the existence of oil would complicate the understanding of the dielectric mechanisms in solid insulation. Therefore, this study focuses on investigating the dielectric properties of non-immersed insulating paper using FDS. Firstly, the spectra of paper with different moisture content were analyzed, and the relationship between dielectric parameters and moisture was quantified through the proposed dielectric model of insulating paper. Then, a three-dimensional dielectric model for spectrum prediction was established, and the feasibility and universality of model was verified. Results show three distinct dielectric response processes in insulating papers: the hopping conduction (RI), the low-frequency relaxation polarization (RII), and the high-frequency relaxation polarization (RIII). With increasing moisture content, RI and RII processes shift synchronously and exponentially towards higher frequencies with the dielectric curve shape maintained, while RIII process is unaffected. Moreover, the proposed spectrum prediction model can accurately predict the spectrum of insulating paper with varying moisture content. The dielectric response mechanism and three-dimensional dielectric model of insulating paper identified in this study provide the theoretical basis and data support for subsequent studies of the dielectric mechanism and moisture assessment of oil-immersed paper. © 1994-2012 IEEE.

关键词： Frequency domain analysis

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Divertor heat flux challenge and mitigation in the EHL-2 spherical torus

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Plasma Science and technology 2025年第2期27卷 97-109页

作者： Fuqiong WANG Xiang GU Jiankun HUA Yumin WANG Xiaokun BO Bo CHEN Yuejiang SHI Shuai XU Erhui WANG Yunfeng LIANG the EHL-2 Team College of Physics Donghua UniversityShanghai 201620People’s Republic of China Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China ENN Science and Technology Development Co. Ltd.Langfang 065001People’s Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasma PhysicsJülich 52425Germany

The divertor design is critical to heat load handling and thus to achievements of highperformance plasma operations in the EHL-2(ENN He-Long 2)*** paper presents the design of an X-point target(XPT)divertor,featuring a conventional inner divertor and an XPT outer divertor,aimed at the effective control of heat loads,which may be extremely high during high ion temperature *** divertor target plates are made from carbon-based materials,which can handle heat loads of up to 5 MW/m².Divertor performances,including the heat load controllability,the onset of detachment and the in-out/up-down asymmetry,etc.,are evaluated using both the simple particle-tracking strategy and the complicated SOLPS-ITER *** attention is paid to the drift effects on particle/heat transport in the divertor/scrape-off layer region and on the divertor heat loads,focusing on the semi-detached/detached operation *** from SOLPS-ITER simulations demonstrated that the currently designed magnetic equilibrium and divertor configuration can effectively handle the power heat load in EHL-2.

关键词： heat flux divertor EHL-2

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