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5th International Particle Accelerator Conference, IPAC 2014

作者： Chen, D.Z. Li, D. Liu, K.F. Yue, H.K. Li, X.F. Zhou, C. Liu, D.W. Huang, J. Zhang, Z. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783954501328

Powerful negative ion sources are the primary component for a neutral beam injection system used in fusion reactors. Under the support of the Ministry of Science and technology of China, HUST is developing an experimental facility for RF driven hydrogen negative ion source. The research work is presented. Copyright © 2014 CC-BY-3.0 and by the respective authors.

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Optimization of 220kV CVT with series saturated reactor damper 5

Optimization of 220kV CVT with series saturated reactor damp...

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5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Liu, Chun Cui, Zhiming Wang, Danjiang Cai, Bingbing Li, Zhenbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

Based on 220kV capacitive voltage transformer (CVT) equivalent circuit, a model of ferromagnetic resonance damping of CVT with series saturation reactor damper is built, with which a damp condition is derived theoretically. Combined with the data of 220kV CVT obtained from Jiangsu Wuxi Nissin co., LTD, the value of damp resistance is calculated. Simulation results are consistent with the experimental, which is shown that the proposed theory is validated and it can be use to design CVT with no Ferroresonance under certain condition.

关键词： Equivalent circuits

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Notice of Removal: A transients segmentation based control for SMES to enhance power system stability

Notice of Removal: A transients segmentation based control f...

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International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO)

作者： Xiaohan Shi Shaorong Wang Asad Waqar Wenxuan Wu Jianzhao Guo Yiyong Zhu State Key Laboratory of Advanced Electromagnetic Engineering & Technology Huazhong University of Science and Technology Wuhan Hubei China State Grid Quanzhou Electric Power Supply Company Quanzhou Fujian China State Grid Fujian Electric Power CO. LTD Fuzhou Fujian China

Removed.

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Rational Design of Single Molybdenum Atoms Anchored on N‐Doped Carbon for Effective Hydrogen Evolution Reaction

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Angewandte Chemie 2017年第50期129卷

作者： Wenxing Chen Jiajing Pei Chun‐Ting He Jiawei Wan Hanlin Ren Youqi Zhu Yu Wang Juncai Dong Shubo Tian Weng‐Chon Cheong Siqi Lu Lirong Zheng Xusheng Zheng Wensheng Yan Zhongbin Zhuang Chen Chen Qing Peng Dingsheng Wang Yadong Li Department of Chemistry Tsinghua University Beijing 100084 China State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of Chemistry Sun Yat-Sen University Guangzhou 510275 China Shanghai Synchrontron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 201800 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing China National Synchrotron Radiation Laboratory (NSRL) University of Science and Technology of China Hefei Anhui 230029 China

The highly efficient electrochemical hydrogen evolution reaction (HER) provides a promising pathway to resolve energy and environment problems. An electrocatalyst was designed with single Mo atoms (Mo‐SAs) supported on N‐doped carbon having outstanding HER performance. The structure of the catalyst was probed by aberration‐corrected scanning transmission electron microscopy (AC‐STEM) and X‐ray absorption fine structure (XAFS) spectroscopy, indicating the formation of Mo‐SAs anchored with one nitrogen atom and two carbon atoms (Mo 1 N 1 C 2 ). Importantly, the Mo 1 N 1 C 2 catalyst displayed much more excellent activity compared with Mo 2 C and MoN, and better stability than commercial Pt/C. Density functional theory (DFT) calculation revealed that the unique structure of Mo 1 N 1 C 2 moiety played a crucial effect to improve the HER performance. This work opens up new opportunities for the preparation and application of highly active and stable Mo‐based HER catalysts.

关键词： Einzelatomkatalysatoren Elektrokatalyse Molybdän N-dotierter Kohlenstoff Wasserstoffentwicklung

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Simulation on phase angle difference between voltage of metering port and bus of 220kV CVT 5

Simulation on phase angle difference between voltage of mete...

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5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Cai, Bingbing Liu, Chun Wang, Danjiang Cui, Zhiming Wang, Qian Li, Zhenbiao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

In order to study how parameters of CVT affect the phase angle difference between Voltage of Metering Port and Bus Voltage, an EMTP model with actual parameters of a 220kV CVT was established to simulate how some parameters affect the phase angle difference, such as value of voltagedividing capacitors and its dielectric loss, ratio of transformer, coil turns of compensation reactor and the load. The result is shown as followed: (1) The increasing dielectric loss of high voltage capacitor will make phase angle difference decrease significantly, while the increasing dielectric loss of medium voltage capacitor will make phase angle difference increase significantly;(2) Decrease of the ratio of transformer will make phase angle difference increase a little;(3) Increase of capacity and power factor of load will make phase angle difference decrease. These results are available to CVT testing online.

关键词： Dielectric losses

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Output impedance analysis of digitally controlled DC-DC converter

Output impedance analysis of digitally controlled DC-DC conv...

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作者： Wang, Hua Lin, Hua Li, Xing Wang, Xingwei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479956982

In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output impedance which appears near the crossover frequency, the factors which affect the peak are presented. Experimental results verified the theoretical analysis. © 2014 IEEE.

关键词： DC-DC converters

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Investigation of anti-welding performance of nanocrystalline CuCr25 contacts in vacuum 5

Investigation of anti-welding performance of nanocrystalline...

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5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014

作者： Liu, Jinyou Wang, Qian Zhao, Laijun Yang, Xiaocheng Li, Zhenbiao Wang, Danjiang Cai, Bingbing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789881532329

To investigate the anti-welding performance of Nanocrystalline CuCr25, Microcrystalline CuCr25 material was set as comparison group, electrical endurance tests were conducted in the vacuum analog device under the condition of 42V/10A DC. Then the contact surface degradation is analyzed by using FESEM. Experimental result indicates that Nano-contacts have better anti-welding performance than Micro-contacts. The Variation tendency of break arc duration is summarized, and the mechanism of that Nano-contacts have better anti-welding performance is discussed from different aspects, including surface morphology and the elements analysis of the fusion zones.

关键词： Binary alloys

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Efficient Modeling of Cascaded-Multilevel Static Synchronous Compensator on Electronicmagnetic Transient Simulation Program

Efficient Modeling of Cascaded-Multilevel Static Synchronous...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

作者： Zilong Xiao Dan Wang Qing Xiong Chengxiong Mao Jiming Lu Linglong Cai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Cascaded-Multilevel STATCOM (CM-STATCOM) is of great development potential in reactive power compensation device. But it consists of large number of semiconductor devices which significant increases the simulation time in electromagnetic transient simulation program. This paper proposes an efficient model of CM-STATCOM based on Dommel algorithm, which replaces the arm circuit with Thevenin equivalent circuit and numerical calculation block. This paper also introduces ideal switching devices to reduce computation quantity in calculation block. The proposed model that preserves the individual identity of H-bridge and interface to control system is of wide applicability and high accuracy. Besides, the size of nodal admittance matrix is reduced by several orders of magnitude so that the simulation time is reduced drastically. The proposed model is validated in PSCAD/EMTDC under different condition by comparisons with traditional model.

关键词： Cascaded-Multilevel STATCOM (CM-STATCOM) efficient modeling Dommel algorithm Thevein theorem electromagnetic trasient (EMT) simulation

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Optimal Design of Flux-barrier to Improve Torque Performance of IPMSM for Electric Spindle

Optimal Design of Flux-barrier to Improve Torque Performance...

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International Conference on Electrical Machines and Systems

作者： Zhicheng Pan Kai Yang Xiaojie Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479988068

This paper presents an optimal design of interior permanent magnet synchronous machine (IPMSM) for electric spindle considering the flux-barrier shape. Four types of flux-barrier are discussed and compared to improve torque performance, which includes the average torque, torque ripple and cogging torque. The design process is accomplished by using finite element method (FEM). Moreover, the Taguchi method is taken into practice in this paper as a proposed optimal method. The simulation results will be theoretically discussed and analyzed. Finally, prototype machines are being fabricated, and the validity of the proposed design will be confirmed by experiments.

关键词： FEM IPMSM Optimal Design

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A highly reliable online monitoring and real-time alarm system for the insulation condition of power transformers

A highly reliable online monitoring and real-time alarm syst...

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2014 International Conference on Mechatronics and Intelligent Materials, MIM 2014

作者： Sun, Wen Xing Li, Zhao Hui Cheng, Shi Jie State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351412

Many successful applications for the online monitoring of the insulation condition for electric power transformers have been reported over last thirty years. However, false or unsolved alarms have been quite frequently generated by those condition monitoring systems. Failures and some occasionally catastrophic accidents involving transformers have still occurred. A highly reliable insulation condition online monitoring and real-time alarm system has been developed, to help resolve these problems. An electric power transformer has strongly linked mechanical, electrical, magnetic, chemical and thermal characteristics, and is also directly linked to circuit breakers and generators. Team Intelligence (TI) was employed to integrate all the monitoring modules of the various different aspects of the transformer into one unique system. This system could also be integrate with the condition monitoring systems of various linked facilities, such as the monitoring systems of the turbine and the generator in a Optimal Maintenance Information System for Hydropower Plant (HOMIS). Highly reliable monitoring and real-time alarms of transformer insulation condition could be achieved, due to highly coordinated and rapid response features. This system has been deployed in several hydropower plants. The industrial application examples are demonstrated. © (2014) Trans Tech Publications, Switzerland.

关键词： Electric circuit breakers

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