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13th International Beam Instrumentation Conference, IBIC 2024

作者： Zhou, Shaokun Liu, Chengyong Chen, Yu Qin, Bin Chen, Qushan Liu, Xu Li, Dong Chen, Aote Liao, Yicheng Luo, Ruiying Wang, Wei State Key Lab. of Advanced Electromagnetic Engineering & Technology Huazhong University of Science & Technology Wuhan China

ISBN: (纸本)9783954502493

Huazhong University of Science and technology is building a cyclotron-based Proton Therapy Facility (HUST-PTF). The facility mainly consists of a 240 MeV superconducting cyclotron, a beam transport line, a fixed treatment room and two rotational treatment rooms. HUST-PTF uses three kinds of detectors, Scintillation, Faraday cup and ionization chamber, for the beam parameter measurements. In terms of structure, the HUST PTF beam diagnostic system is built according to the standard distributed three-layer structure, which is divided into hardware device layer, data processing layer and GUI layer. Different protocols are used to communicate between the three layers, which can improve reliability and expand flexibly in each layer. © 2024 International Beam Instrumentation Conference. All Rights Reserved.

关键词： Ionization chambers

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Nanopore-rich NiFe LDH targets the formation of the high-valent nickel for enhanced oxygen evolution reaction

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Nano Research 2023年第2期16卷 2286-2293页

作者： Qunlei Wen Shuzhe Wang Ruiwen Wang Danji Huang Jiakun Fang Youwen Liu Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Nickel-iron layered double hydroxides(NiFe LDHs)represent a promising candidate for oxygen evolution reaction(OER),however,are still confronted with insufficient activity,due to the slow kinetics of electrooxidation of Ni^(2+)cations for the high-valent active ***,nanopore-rich NiFe LDH(PR-NiFe LDH)nanosheets were proposed for enhancing the OER activity together with *** the designed catalyst,the confined nanopores create abundant unsaturated Ni sites at edges,and decrease the migration distance of protons down to the scale of their mean free path,thus promoting the formation of high-valent Ni^(3+)/^(4+)active *** unique configuration further improves the OER stability by releasing the lattice stress and accelerating the neutralization of the local acidity during the phase ***,the optimized PR-NiFe LDH catalysts exhibit an ultralow overpotential of 278 mV at 10 mA∙cm^(−2)and a small Tafel slope of 75 mV∙dec^(−1),which are competitive among the advanced LDHs based ***,the RP-NiFe LDH catalyst was implemented in anion exchange membrane(AEM)water electrolyzer devices and operated steadily at a high catalytic current of 2 A over 80 *** results demonstrated that PR-NiFe LDH could be a viable candidate for the practical *** concept also provides valuable insights into the design of other catalysts for OER and beyond.

关键词： nickel-iron layered double hydroxides(NiFe LDHs) water oxidation nanopores high-valent sites

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Multi-scale regulation in S,N co-incorporated carbon encapsulated Fe-doped CO_(9)S_(8) achieving efficient water oxidation with low overpotential

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Nano Research 2022年第2期15卷 872-880页

作者： Wenbin Wang Yang Yang Yang Zhao Shuzhe Wang Xiaomeng Ai Jiakun Fang Youwen Liu State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sulfide compounds provide a type of promising alternative for oxygen evolution reaction(OER)electrocatalysts due to their diversity,intrinsic activities,low-price and ***,the unsmooth mass transport channel,the collapse of the structure and insufficient intrinsic activities limit their potential for OER *** respond,the dense Fe-doped Co_(9)S_(8) nanoparticles encapsulated by S,N co-incorporated carbon nanosheets(Fe-Co_(9)S_(8)@SNC)were proposed and synthesized via fast thermal treatment from ultrathin metal-organic frameworks(MOFs)*** designed catalysts,the nanosheet configuration connected by nanoparticles retained rich access for permeation of electrolyte and precipitation of O_(2) bubbles during OER ***,the outer carbon layer of Co9S8 provided additional catalytic activity while acting as armor to keep the structure *** the atomic scale,the doped Fe regulated the local charge density and the d-band center for facilitating desorption of oxygen *** from this multi-scale regulation strategy,the Fe-Co_(9)S_(8)@SNC displays an ultralow overpotential of 273 mV at 10 mA·cm^(-2) and small Tafel slope of 55.8 mV·dec^(-1),which is even close to the benchmark RuO_(2) *** concept could provide valuable insights into the design of other catalysts for OER and beyond.

关键词： Co9S8 water oxidation electronic structure multi-scale regulation d-band center

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Interactions between multiple filaments and bacterial biofilms on the surface of an apple

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Plasma Science and technology 2018年第4期20卷 38-46页

作者：程鹤徐茂源潘姝慧卢新培刘大伟 State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology IFSA Collaborative Innovation Center Shanghai Jiao Tong University

In this paper, the interactions between two dielectric barrier discharge(DBD) filaments and three bacterial biofilms are simulated. The modeling of a DBD streamer is studied by means of 2D finite element calculation. The model is described by the proper governing equations of air DBD at atmospheric pressure and room temperature. The electric field in the computing domain and the self-consistent transportation of reactive species between a cathode and biofilms on the surface of an apple are realized by solving a Poisson equation and continuity equations. The electron temperature is solved by the electron energy conservation equation. The conductivity and permittivity of bacterial biofilms are considered, and the shapes of the bacterial biofilms are irregular in the uncertainty and randomness of colony growth. The distribution of the electrons suggests that two plasma channels divide into three plasma channels when the streamer are 1 mm from the biofilms. The toe-shapes of the biofilms and the simultaneous effect of two streamer heads result in a high electric field around the biofilms, therefore the stronger ionization facilitates the major part of two streamers combined into one streamer and three streamers *** distribution of the reactive oxygen species and the reactive nitrogen species captured by time fluences are non-uniform due to the toe-shaped bacterial biofilms. However, the plasma can intrude into the cavities in the adjacent biofilms due to the μm-scale mean free path. The two streamers case has a larger treatment area and realizes the simultaneous treatment of three biofilms compared with one streamer case.

关键词： plasma biofilm filaments

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The enhanced aerosol deposition by bipolar corona discharge arrays

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Plasma Science and technology 2021年第6期23卷 83-88页

作者： Jiacheng LI Zhongzheng HUANG Dawei LIU Kuanlei ZHENG State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electrical and Information Engineering Wuhan Institute of TechnologyWuhan 430205People’s Republic of China

The corona discharges provide an efficient way to induce precipitation or eliminate fog by increasing ion density in the open *** this paper,one bipolar corona discharge array(positive and negative high voltage coupled simultaneously)which can generate high densities of positive and negative ions is *** comparison between bipolar corona discharge array and unipolar corona discharge array(positive or negative coupled only)indicates that bipolar corona discharge array can generate~3 times higher ion density than unipolar corona discharge *** charged aerosols are produced through collisions between ions and *** collision rate between aerosols is increased substantially by the attractive forces between positively and negatively charged *** deposition of aerosols induced by bipolar discharges is 25.7%higher than that of unipolar discharges at the humidity super-saturation ***,the bipolar corona discharge system is a new option for the large scale ion sources used for artificial weather modification.

关键词： corona discharges charged aerosols bipolar discharges

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Research on DC voltage control strategies for typical four-terminal HVDC system

Research on DC voltage control strategies for typical four-t...

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2013 2nd International Conference on Sustainable Energy and Environmental engineering, ICSEEE 2013

作者： Wang, Kai Sun, Hai Shun Hua, Yu Liu, Yuan Lin, Wei Xing Li, Cheng Hao State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038350217

The continuous development of alternative energy has put forward higher requirement for electricity transmission. To cope with its fluctuation characteristics, high voltage direct current (HVDC) technology has received more attention. Voltage Source Converter (VSC) based Multi-Terminal High Voltage Direct Current (MTDC) represents the future trend of HVDC technology. This paper mainly focuses on the control strategies of a four-terminal VSC based MTDC power transmission system. The operation characteristic of the system was studied, and the proposed two control strategies, master-slave control strategy and DC voltage droop control strategy, were verified through simulations. The latter control strategy was proved to be performing well under various conditions, including converter station disconnection and faults at AC side of the converter. © (2014) Trans Tech Publications, Switzerland.

关键词： HVDC power transmission

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Wide-area backup protection algorithm based on multisource information fusion

Wide-area backup protection algorithm based on multisource i...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： He, Zhiqin Zhang, Zhe Yin, Xianggen Li, Zhenxing Deng, Xing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781447124665

Wide-area backup protection is a novel technique presented in recent years, which uses multisource information to make fault identification decision and availab.y prevents catastrophic blackouts. However, the property of algorithm will be deteriorated when information error exists. For the sake of improving the property of wide-area backup protection, this paper proposes an information fusion strategy using genetic algorithm to optimize the decision-making function. The operation information from local directional pilot relay and impedance relay is applied to establish the fitness function. Simulation tests based on IEEE 3-generator and 9-bus system validates the presented algorithm under as many as 3 bits information error. © 2012 Springer-Verlag London Limited.

关键词： Genetic algorithms

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A High Efficiency Hybrid Modular Multilevel Converter with a SiC Device-Based External Shaping Module

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IEEE Transactions on Power Electronics 2025年

作者： Ren, Peng Guo, Qi Hou, Yuchao Tu, Chunming Zhu, Donghai Sun, Kai Wang, Lei Xiao, Fan Hunan University College of Electrical and Information Engineering Changsha 410082 China Tsinghua Shenzhen International Graduate School Shenzhen 518000 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan 430074 China Tsinghua University State Key Lab of Power Systems Department of Electrical Engineering Beijing 100084 China

In order to improve the waveform quality and efficiency of medium voltage modular multilevel converter (MMC), a hybrid MMC (HMMC) topology with an external shaping module is proposed. Each arm of the HMMC consists of N half-bridge submodules (HSMs) based on Si IGBT, while a full-bridge submodule (FSM) based on SiC MOSFET on the ac side. Furthermore, a 2N+1 level hybrid modulation strategy is proposed for this topology. The HSMs operate in the low-frequency state to output the staircase wave voltage, while the FSM operates in the high-frequency state to reduce the harmonics of the output voltage. It makes full use of the advantages of low on-state loss of Si devices and low switching loss of SiC devices. Additionally, the energy fluctuation of the HMMC submodules is analyzed in detail, and a voltage balancing scheme is proposed. In the end, the feasibility and effectiveness of the proposed topology and modulation method are validated by simulation and experimental studies on a single-phase HMMC. Moreover, the comparison of cost and loss between HMMC and existing MMCs proves that the proposed HMMC can better balance the device cost and operating loss. © 1986-2012 IEEE.

关键词： efficiency optimization Hybrid MMC hybrid modulation Si IGBT SiC MOSFET voltage balancing

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Analysis of the UHV tie line active power peak value of weak interconnected grids following power shortage disturbance in China power system

Analysis of the UHV tie line active power peak value of weak...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： Hong, Feng Chen, Jinfu Duan, Xianzhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781447124665

An ultra high voltage (UHV) AC tie line that connects North China and Central China power grid has been put into operation in 2009. This paper presents a method to calculate the peak value of active power oscillation of the UHV AC tie line following power shortage disturbance. The typical process of the oscillation on the UHV AC line is analyzed. It is shown that the active power oscillation on tie line of week connection grid is similar with the step response of the second-order system. The oscillation peak value is closely related to fault location, system inertia, and system inter-area damping. The method and analysis are tested in China system. © 2012 Springer-Verlag London Limited.

关键词： Electric power transmission networks

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Power flow unsolvable cases adjustment method based on grid static voltage stability

Power flow unsolvable cases adjustment method based on grid ...

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2011 International Conference on advanced Power System Automation and Protection, APAP 2011

作者： Hong, Feng Chen, Jinfu Zuo, Jian State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (纸本)9781424496198

The unsolvable power flow problem is one of the basic issues in dispatching automation, which frequently appears in the process of grid mode planning and Optimal Power Flow (OPF) analysis. To deal with this problem, a practical adjustment method based on grid weak point is proposed in this paper. This method use "lower power injection" method to calculate a similar power flow solution which also the system maximum load level in unsolvable case. According this solution, the system weak point can be found by the index based on local system operation parameters and external equivalent system model. Combined with sensitivity analysis to reschedule the active power of generators and reactive power compensation devices, so as to make the system maximum load level increase, eventually get the system power flow solution at the original load level. This method overcome the large calculation of optimize algorithm in unsolvable power flow problem and can be applied to large practical grid. In the meantime, this method has clear physical interpretation, operator can be involved during the process, have great value in application. The method is tested on IEEE14 nods system. © 2011 IEEE.

关键词： Sensitivity analysis

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