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2014 SID International Symposium

作者： Pan, Su Kwok, Hoi-Sing Department of Electronic and Computer Engineering State Key Lab on Advanced Displays and Optoelectronics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

We proposed a novel visible polarizer based on multilayer silicon and silicon oxide alternative subwavelength grating and its optical characteristic is numerically investigated by finite difference time domain method. The reflectance of TE mode and transmission of TM mode are above 90% with extinction ratio up to 103 Moreover, the proposed polarizer also has wide angular field and large fabrication tolerance. © 2014 SID.

关键词： Silicon oxides

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Research for the fast distance protection of transmission lines based on equal transfer processes

Research for the fast distance protection of transmission li...

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China International Conference on Electricity Distribution, CICED

作者： He He Shaneng Xu Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Quanzhou Power Supply Company of State Grid Quanzhou China

Taking into account the error caused by differential, two factors' impact on the distance protection algorithm after equal transfer processes are studied, including the sampling rate and cut-off frequency of the low-pass filter. It comes to a conclusion that increasing the sampling rate can reduce the error caused by differential and cutting down the cut-off frequency can reduce the variance of the least square method, which is verified by the ATP simulation and dynamic physical simulation results. Combined with the simulation results, the impact caused by the length of data window is studied by analyzing the performances of the proposed algorithm. By optimizing the sampling rate, the cutoff frequency, and the length of data window, the distance measuring error can be achieved within 5% at approximately 10ms after the fault occurrence.

关键词： Abstracts Equations Cutoff frequency

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Dynamic compensating strategy and en-stabilizing compensator to enhance the stability of wind farms integrated into weak grid

Dynamic compensating strategy and en-stabilizing compensator...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Lei Shang Jiabing Hu Xiaoming Yuan Mingquan Zhao Gang Liu Lin Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Xuji Corporation State Grid Corporation of China Xuchang China

ISBN: (纸本)9781479951635

This paper presents a novel dynamic compensating concept and corresponding compensating facility to enhance the operation stability of wind farms integrated into weak grid. The stability problems of wind turbine in the mechanical time scale firstly is briefly analyzed by the dynamic power balance principle. Then the dynamic compensating concept and facility, the en-stabilizing compensator (ESC) is presented. Moreover, the ESC is controlled based on the instantaneous power synchronization method to instantaneously and spontaneously provide dynamic power compensation. Finally, simulations are carried out to verify the correctness and validity of the compensating concept and the ESC.

关键词： Wind turbines Reactive power Power system dynamics Power system stability Vectors Stability analysis Torque

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electromagnetic Design of HTS D-shaped Coils for a Toroidal-type Superconducting Magnet

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Physics Procedia 2014年 58卷 244-247页

作者： H. Liu X. Deng L. Ren Y. Xu J. He Y. Tang State Key Lab. of Advanced Electromagnetic Engineering and Technology (R&D Center of Applied Superconductivity Huazhong University of Science and Technology) 1037 Luoyu Road Wuhan 430074 P. R. China

High current and magnetic field are essential for achieving MCF (magnetic confinement fusion). Superconducting materials and technology have unique advantages to achieve high magnetic field and large-current transmission. With the commercialization of 2G HTS tapes, they are paid wide attention to in Tokamak magnet application. In order to investigate the feasibility of applying HTS into Tokamak magnets, a toroidal-type magnet has been designed using YBCO tapes by means of FEM analysis combining with Matlab. The effects of the coil number and coil arrangements on the critical current, the maximum parallel magnetic field, the inductance and the storage capacity of the magnet are analyzed. Based on that, key technological points of the electromagnetic design are discussed.

关键词： electromagnetic design HTS D-shaped coils FEM analysis

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A Self‐Healing Aqueous Lithium‐Ion Battery

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Angewandte Chemie 2016年第46期128卷

作者： Yang Zhao Ye Zhang Hao Sun Xiaoli Dong Jingyu Cao Lie Wang Yifan Xu Jing Ren Yunil Hwang In Hyuk Son Xianliang Huang Yonggang Wang Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai 200438 China Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Fudan University Shanghai 200438 China Energy Materials Lab Materials Research Center Samsung Advanced Institute of Technology Samsung Electronics Co. LTD. 130 Samsung-ro Suwon-si Gyeonggi-do 443803 South Korea Samsung R&D Institute China Beijing 100028 China

Flexible lithium‐ion batteries are critical for the next‐generation electronics. However, during the practical application, they may break under deformations such as twisting and cutting, causing their failure to work or even serious safety problems. A new family of all‐solid‐state and flexible aqueous lithium ion batteries that can self‐heal after breaking has been created by designing aligned carbon nanotube sheets loaded with LiMn 2 O 4 and LiTi 2 (PO 4 ) 3 nanoparticles on a self‐healing polymer substrate as electrodes, and a new kind of lithium sulfate/sodium carboxymethylcellulose serves as both gel electrolyte and separator. The specific capacity, rate capability, and cycling performance can be well maintained after repeated cutting and self‐healing. These self‐healing batteries are demonstrated to be promising for wearable devices.

关键词： Flexible Elektronik Kohlenstoffnanoröhren Lithiumionenbatterien Nanotechnologie Selbstheilende Polymere

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Correction to ”A New Transient Power Quality Disturbances Detection Using Strong Trace Filter” [Dec 14 2863-2871]

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IEEE Transactions on Instrumentation and Measurement 2015年第3期64卷 834-834页

作者： Shunfan He Kaicheng Li Ming Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China College of Computer Science South-Central University for Nationalities Wuhan China College of Electronics and Information Engineering Wuhan Textile University Wuhan China

In the above paper (ibid., vol 63, no. 12, pp. 2863-2871, Dec. 2014), the first footnote should appear as follows.

关键词： Embedded systems Kalman filters Transient analysis Power quality Parameter estimation

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Radial-axial Force Controlled electromagnetic Sheet Deep Drawing: electromagnetic Analysis

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Procedia engineering 2014年 81卷 2505-2511页

作者： Zhipeng Lai Quanliang Cao Xiaotao Han Zhongyu Zhou Qi Xiong Xiao Zhang Qi Chen Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

A new approach, radial-axial force controlled (RAFC) electromagnetic sheet forming (EMF), has been developed for hard-form metal sheet deep drawing. Different to the traditional EMF, an additional radial Lorentz force was introduced at the flange region of workpiece to improve the material flow and reduce the maximum strain of workpiece. For this purpose, an EMF system with two coils has been designed. The two coils were used to generate the axial Lorentz force (Fz) on the workpiece region (D1) above the cavity and the radial force (Fr) on the flange region (D2), respectively. The Fz was used to accelerate the D1 region's material in axial direction to shape the workpiece into the die, while the Fr was used to accelerate the D2 region's material in negative radial direction to improve the material flow of the flange. In this paper the electromagnetic analysis of the system has been carried out. As a proof of concept, the variation characteristics of Fr and Fz under different discharging energies and schedules of the coils were simulated and analyzed. The results show that the magnitudes and the action time of the Fr and the Fz can be well controlled, which indicates that the forming can be flexibly controlled.

关键词： electromagnetic sheet forming Material flow Radial-axial force controlled Strain distribution

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Study of distributed busbar protection based on a wireless sensor network

Study of distributed busbar protection based on a wireless s...

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Jie Song Xiangning Lin Jinwen Sun Qianwen Guo Management School Jinan University Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Since busbar protection is the cornerstone of smart grid stability, a wireless sensor network (WSN) of distribution busbar protection is presented, and architecture of the WSN and busbar protection principles are proposed in this paper. The fault detection, analysis and judgment of WSN protection owns a unique feature but still has common characteristics with traditional protection scheme. Based on the traveling-wave generated in power system, when a fault occurs, a novel time synchronization scheme is employed to improve the protection performance and accuracy. Simulation results indicate that the scheme can acquire synchronization time and reduce the possibility of mis-operation of WSN based protection.

关键词： Wireless sensor networks Synchronization Wireless communication Circuit faults Power transmission lines Asia Transmission line measurements

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A Design of WSN and EPON Applied in Online Monitoring for Transmission Line

A Design of WSN and EPON Applied in Online Monitoring for Tr...

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2014 4th International Conference on Materials,Mechatronics and Automation(ICMMA 2014)

作者： Xu Chen Zhe Du Xianggen Yin Pan Wei Liqiang Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Electric Power Research Institute of Hunan Power Grid Corporation

Natural disasters like icing have a strong impact on the power transmission line which is the foundation of safety and stability operation for power system. In this paper, an online transmission line monitoring and patrol system based on Wireless Sensor Network(WSN) and Ethernet Passive Network(EPON) is firstly designed and a model is built to analyze the latency influenced by the number of towers using EPON communication technology which is solved by Lingo 11.

关键词： Monitoring system Overhead transmission line Wireless sensor network Optical fiber composite overhead ground wire Zigbee

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Mid-frequency prediction of transmission loss using a novel hybrid deterministic and statistical method

Mid-frequency prediction of transmission loss using a novel ...

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作者： Wu, Fei Liu, Gui Rong Li, Guangyao Cheng, Aiguo He, Zhicheng State Key Lab of Advanced Technology for Vehicle Body Design and Manufacture Hunan University Changsha410082 China Department of Aerospace Engineering and Engineering Mechanics University of Cincinnati 2851 Woodside Dr CincinnatiOH45221 United States

A novel hybrid deterministic-statistical approach named ES-FE-SEA method specially used to predict the sound Transmission loss of panels in mid-frequency is proposed in this paper. The proposed hybrid methods takes the best advantages of edged-based smoothing FEM (ES-FEM) and statistical energy analysis (SEA) to further improve the accuracy of mid-frequency transmission loss predictions. The application of ES-FEM will "soften" the well-known "overly-stiff" behavior in the standard FEM solution and reduce the inherent numerical dispersion error. While the SEA approach will deal with the physical uncertainty in the relatively higher frequency range. Two different types of subsystems will be coupled based on "reciprocity relationship" theorem. The proposed was firstly applied to a standard simple numerical example, and excellent agreement with reference results was achieved. Thus the method is then applied to a more complicated model-a 2D dash panel in a car. The proposed ES-FE-SEA is verified by various numerical examples. © JVE INTERNATIONAL LTD.

关键词： Finite element method

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