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The impact of toroidal mode coupling on high-density discharges in J-TEXT

Plasma Science and technology 2024年第12期26卷 1-8页

作者： Peng DENG Wenzhe MAO Zhipeng CHEN Yinan ZHOU Peng SHI Zhoujun YANG Li GAO Tao LAN Jinlin XIE Hong LI Zian WEI Adi LIU Chu ZHOU Weixing DING Wandong LIU Ge ZHUANG School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

Density limit has long been a widely studied issue influencing the operating range of *** rapid growth of the m/n=2/1(where m and n are poloidal and toroidal mode numbers,respectively)tearing mode is generally regarded as a primary precursor to the density limit *** this experiment,the coupling of the m/n=1/1 mode and the m/n=2/1 mode in highdensity plasma was *** a sawtooth cycle,the frequencies of the two modes gradually converge until they become *** that,toroidal coupling occurs between the 1/1 and 2/1 modes,resulting in a mutually fixed phase *** the occurrence of toroidal coupling,the 2/1 mode is *** to the disruption,the cessation of the 1/1 and 2/1 mode coupling,along with the rapid growth in the amplitude of the 2/1 mode,can be ***,under the same parameters,comparing discharges with or without the 1/1 mode,it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.

关键词： toroidal coupling tearing mode density limit sawtooth

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Facile construction of Mxene-supported niobium hydride nanoparticles toward reversible hydrogen storage in magnesium borohydride

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Rare Metals 2024年第9期43卷 4387-4400页

作者： Ao Xia Jia-Guang Zheng Qing-Bo Zhang Yu-Gang Shu Cheng-Guo Yan Liu-Ting Zhang Zhan-Liang Tao Li-Xin Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The facile construction of nanoscale NbH_(x)supported by Ti_(3)C_(2)(NbH_(x)@Ti_(3)C_(2))was achieved using facile ball milling strategy to improve the hydrogen desorption kinetics and reversibility of magnesium borohydride(Mg(BH_(4))_(2)).The doping of 30 wt%NbH_(x)@Ti_(3)C_(2)catalyst reduced the onset dehydrogenation temperature of Mg(BH_(4))_(2)to 71.2℃.Additionally,the Mg(BH_(4))_(2)+30NbH_(x)@Ti_(3)C_(2)composite achieved remarkable hydrogen release of over 9.2 wt%at a temperature as low as 230℃,indicating unexpected dehydrogenation ***,the reversibility of NbH_(x)@Ti_(3)C_(2)doped Mg(BH_(4))_(2)was retained to more than 4.2 wt%after four cycles,which was increased by 68%compared to that of undoped Mg(BH_(4))_(2).The strong catalysis of NbH_(x)@Ti_(3)C_(2)catalyst could be attributed to the synergistic effect of NbH_(x)and Ti_(3)C_(2)in hydrogen spillover and ***_(x)acted as a"hydrogen pump"for effective hydrogen spillover,while Ti_(3)C_(2)created numerous diffusion channels for hydrogen dissolution and provided the active catalytic site to facilitate the re/dehydrogenation of Mg(BH_(4))_(2).

关键词： Hydrogen storage Magnesium borohydride Catalysts Mxene

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On the evolution and formation of discharge morphology in pulsed dielectric barrier discharge

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Plasma Science and technology 2024年第4期26卷 101-113页

作者：陈星宇李孟琦王威逸张权治彭涛熊紫兰 State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

The discharge morphology of pulsed dielectric barrier discharge(PDBD) plays important roles in its applications. Here, we systematically investigated the effects of the voltage amplitude,discharge gap, and O_(2)content on the PDBD morphology, and revealed the possible underlying mechanism of the U-shaped formation. First, the morphological evolution under different conditions was recorded. A unique U-shaped region appears in the middle edge region when the gap is larger than 2 mm, while the entire discharge region remains columnar under a 2 mm gap in He PDBD. The width of the discharge and the U-shaped region increase with the increase in voltage, and decrease with the increase of the gap and O_(2)content. To explain this phenomenon,a two-dimensional symmetric model was developed to simulate the spatiotemporal evolution of different species and calculate the electric thrust. The discharge morphology evolution directly corresponds to the excited-state atomic reduction process. The electric thrust on the charged particles mainly determines the reaction region and strongly influences the U-shaped *** the gap is less than 2 mm, the electric thrust is homogeneous throughout the entire region,resulting in a columnar shape. However, when the gap is larger than 2 mm or O_(2)is added, the electric thrust in the edge region becomes greater than that in the middle, leading to the U-shaped formation. Furthermore, in He PDBD, the charged particles generating electric thrust are mainly electrons and helium ions, while in He/O_(2)PDBD those that generate electric thrust at the outer edge of the electrode surface are mainly various oxygen-containing ions.

关键词： low-temperature plasma dielectric barrier discharge discharge morphology particle distribution electric thrust

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A Blockchain-Based Microgrid Measurement Data Storage and Tampering Detection Framework 37th

A Blockchain-Based Microgrid Measurement Data Storage and Ta...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

With the rapid development of distributed power generation and microgrids, secure storage of microgrid measurement data becomes an imminent issue. In order to defend against cybersecurity threats, a microgrid measurement data storage framework should not only ensure the integrity and traceability of the stored microgrid measurement data, but also be able to detect any malicious data tampering. In this paper, a microgrid measurement data storage framework based on Hyperledger Fabric, a blockchain technology, is proposed and implemented, on top of which a data tampering detection method based on the uniqueness of the transaction number (TxId) and the Strong Collision-Resistant of hash theory is developed. Case studies show that the proposed framework can well meet the requirement of data storage traceability, transparent sharing, and tampering resistance, and the requirement of automatic data tampering detection, which provides a new research idea and direction for the future study in microgrid measurement data storage. © 2023, state Grid Electric Power.

关键词： Blockchain

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In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-Qiang Meng Jian-Jiang Wang Dian-Long Wang Kai-Qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

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A Model Predictive Control Method for Hybrid Energy Storage Systems

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CSEE Journal of Power and Energy Systems 2021年第2期7卷 329-338页

作者： Siyuan Chen Qiufan Yang Jianyu Zhou Xia Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The traditional PI controller for a hybrid energy storage system(HESS)has certain drawbacks,such as difficult tuning of the controller parameters and the additional filters to allocate high-and low-frequency power *** paper proposes a model predictive control(MPC)method to control three-level bidirectional DC/DC converters for grid-connections to a HESS in a DC ***,the mathematical model of a HESS consisting of a battery and ultra capacitor(UC)is established and the neutral point voltage imbalance of a three-level converter is solved by analyzing the operating modes of the ***,for the control of the grid-connected converters,an MPC method is proposed for calculating steady-state reference values in the outer layer and the dynamic rolling optimization in the inner *** outer layer ensures the voltage regulation and establishes the current predictive model,while the inner layer,using the model predictive current control,makes the current follow the predictive value,thus reducing the system current *** cascaded topology has two independent controllers and is free of filters to realize the high-and low-frequency power allocation for a ***,it allows two types of energy storage devices to independently regulate the voltage and realizes the power allocation of the battery and ***,simulation studies are conducted in PSCAD/EMTDC,and the effectiveness of the proposed HESS control strategy is verified in a case,such as a controller comparison and fault scenario.

关键词： Double layer control method hybrid energy storage system(HESS) model predictive control(MPC) three-level DC/DC converter

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Design of Large Capacity AC Low Frequency Power Supply Based on Thyristor AC-AC Frequency Conversion

Design of Large Capacity AC Low Frequency Power Supply Based...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Xu, Huangsheng Ma, Shaoxiang Du, Zhenchang Zhang, Hongqi Guo, Jiong Zhang, Wenjie Zhang, Ming Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

In recent years, due to the continuous connection of high-power power electronic devices and other large capacity and nonlinear loads to the power grid, the low-frequency harmonics caused by these devices have seriously affected the power quality of the power grid. This paper proposes a design scheme for large-capacity low-frequency AC power supply based on thyristor AC/AC inverter. On the basis of controlling phase angle a, control of pulse width P was added, and a simulation model of a three-phase six pulse dual variable AC-AC frequency conversion closed-loop system was built in MATLAB/Simulink environment to verify its output effect in the thyristor AC-AC frequency conversion system. The power scheme can be used to simulate low-frequency interharmonics in the output power supply system, providing a fundamental platform for conducting low-frequency interharmonics research. © 2024 IEEE.

关键词： Thyristors

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Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng Li Ming-Wei Zhang Ji-Wu Xin Lei Wei Wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

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New Sliding Mode Control Algorithm of Magnetic Bearing Based on state Feedback Decoupling

New Sliding Mode Control Algorithm of Magnetic Bearing Based...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Liu, Haoqi Ye, Caiyong Wang, Tianyu Zhao, Yunfeng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China National Center for Quality Inspection and Test of Motors Anhui China

ISBN: (纸本)9798331530174

A new sliding mode control method based on state feedback decoupling is introduced, which solves the problem of poor decoupling control effect of traditional control strategy on active magnetic bearing (AMB). In this paper, magnetic bearing system is divided into four independent subsystems by using the principle of linear state feedback. Secondly, considering the shortcomings of the traditional controller, a nonlinear nonsingular terminal sliding mode controller with terminal sliding mode is proposed. Aiming at the chattering problem in sliding mode control, an easy-to-implement sigmoid function is designed to replace the traditional discontinuous switching function. Finally, by building a simulation model and conducting simulation experiments, it is proved that the control strategy combining the above two methods can improve the control accuracy, response speed and robustness of the magnetic bearing control system. © 2024 IEEE.

关键词： Sliding mode control

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Low Latency Data Acquisition Design for Real-Time Disruption Prediction 3

Low Latency Data Acquisition Design for Real-Time Disruption...

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3rd International Conference on Energy, Power and Electrical technology, ICEPET 2024

作者： Zhang, Peilong Ye, Weijie Zheng, Wei Ding, Yonghua Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798350352658

DL-based prediction models have been used to predict plasma disruption. The real-time running of the prediction model needs real-time diagnostic data transferred from Real-time data acquisition (DAQ). In this paper, a real-time data acquisition system is implemented. It supports high sample rates, multi-analog input channels, and low data transmission latency. The key feature of this real-time DAQ system is that it can stream sample data in very low latency over traditional UDP ethernet. The sample rate can reach 2M per channel, and analog input channels can reach 32. Data transmission latency is less than 5.5μs. This data acquisition equipment has good DC and AC accuracy and good real-time performance. © 2024 IEEE.

关键词： Prediction models

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