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2017 IEEE 2nd Information technology, Networking, Electronic and Automation Control Conference (ITNEC 2017)

作者： Yuanlin Luo Zhaohui Li Tian Chen School of Hydropower and Information Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781509064151;9781509064144

The propagation of PD pulses through the winding, from the discharge site to the sensor location, is influenced by the frequency of signal and the geometry of generator, which is of critical importance for accurate measurement of the PD signals. The previous researches on PD propagation were mainly made on turbine generator or motor, little work had been done on hydro generator. To address this concern, an experimental study of the propagation of PD pulses in the stator winding of a large hydro generator is presented in this paper. In the test, the insulation outside slot exit of 22 bars was removed to directly inject PD pulses to the inner conductor. The results indicated PD signals manifest two modes when propagating in stator winding of large hydro generator, and 5 MHz is the corner frequency of them. The coupling between bars in slot or overhang will cause crosstalk between phases, which obscures PD source location.

关键词： hydro generator stator winding partial discharge attenuation crosstalk

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Inhomogeneity-Induced Casimir Transport of Nanoparticles

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Physical Review Letters 2018年第13期121卷 130401-130401页

作者： Fanglin Bao Kezhang Shi Guanjun Cao Julian S. Evans Sailing He Centre for Optical and Electromagnetic Research Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical Instrumentation National Engineering Research Center of Optical Instrumentation JORCEP College of Optical Science and Engineering Zhejiang University Hangzhou 310058 China Department of Electromagnetic Engineering Royal Institute of Technology 10044 Stockholm Sweden

We propose a scheme for transporting nanoparticles immersed in a fluid, relying on quantum vacuum fluctuations. The mechanism lies in the inhomogeneity-induced lateral Casimir force between a nanoparticle and a gradient metasurface and the relaxation of the conventional Dzyaloshinskiǐ-Lifshitz-Pitaevskiǐ constraint, which allows quantum levitation for a broader class of material configurations. The velocity for a nanosphere levitated above a grating is calculated and can be up to a few microns per minute. The Born approximation gives general expressions for the Casimir energy which reveal size-selective transport. For any given metasurface, a certain particle-metasurface separation exists where the transport velocity peaks, forming a “Casimir passage.” The sign and strength of the Casimir interactions can be tuned by the shapes of liquid-air menisci, potentially allowing real-time control of an otherwise passive force, and enabling interesting on-off or directional switching of the transport process.

关键词： Casimir effect & related phenomena Quantum fluctuations & noise Langevin equation Rigorous coupled-wave analysis

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ZVS operation range analysis of three-level dual active bridge DC-DC converter with phase-shift control 32

ZVS operation range analysis of three-level dual active brid...

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32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017

作者： Jin, Li Liu, Bangyin Duan, Shanxu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509053667

This paper presents a comprehensive analysis of the zero-voltage-switching (ZVS) operation range of the isolated bidirectional three-level (3L) dual active bridge (DAB) DC-DC converter with phase shift (PS) control. On this basis, the parameters optimized of 3L-DAB can be proposed to meet the requirements of ZVS under the PS control, which will improve the performance features of 3L-DAB by reducing the losses and increasing efficiency. At last, the simulation results showed agreement with theoretical analysis, and the theoretical analysis showed a great guidance for parameters design and performance optimization of 3L-DAB. © 2017 IEEE.

关键词： DC-DC converters

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Design of high temperature gate driver for SiC MOSFET for EV motor drives

Design of high temperature gate driver for SiC MOSFET for EV...

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2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Wang, Hanxiang Jiang, Dong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781538628942

High temperature (HT) gate driver is a key technology for the motor drive application for electrical vehicle (EV) in HT environment. Based on the available HT devices, this paper introduces the design of HT gate driver for SiC MOSFET. The gate driver architecture with isolation function is discussed first. Then, gate driver hardware design is presented. Besides the basic driving function of driving ability and isolation, the over current protection and cross-talk suppression functions of the gate driver are emphasized and simulated, too. With the design process in this paper, SiC MOSFET can be driven stably and reliably at HT. © 2017 IEEE.

关键词： Design

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Impact of application of SiC devices in motor drive on EMI 32

Impact of application of SiC devices in motor drive on EMI

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32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017

作者： Fang, Zhihao Jiang, Dong Shen, Zewei Qu, Ronghai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781509053674

This paper gives a study on the EMI noise problem of motor drives, especially the impact of application of fast-switching SiC devices. First, the noise source model has been analyzed and the two major factors: device switching action and inverter switching frequency have been claimed. Device switching performance analysis has been done to show that the fast switching speed will generate bigger EMI noise at EMI high frequency range, ringing in the device switching can worsen the EMI noise near the ringing frequency, too. In the meantime, increasing of switching frequency of inverter can bring bigger EMI noise at EMI low frequency range. With variable switching frequency, EMI peak value can be reduced for the motor drive. But the average EMI of SiC motor drive is still bigger than Si motor drive which is with lower average switching frequency. The analysis has been supported by experimental results. The challenge of EMI should be considered for motor drive with SiC devices for advanced applications. © 2017 IEEE.

关键词： Silicon carbide

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Optimal design of saturated switched reluctance machine for low torque ripple and high average torque

Optimal design of saturated switched reluctance machine for ...

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2017 IEEE International Magnetics Conference, INTERMAG 2017

作者： Cui, X. Sun, J. Gu, C. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781538610862

关键词： Rare earths

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Research on Output Scenarios of Offshore Wind Power Considering Characteristics of Marine Weather

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Journal of Physics: Conference Series 2021年第1期1993卷

作者： Honglin Chen Xing Chen Hao Yu Suhua Lou Yong Lin Liang Xu Power System Planning Research Center of Guangdong Power Grid Co. Ltd. Guangzhou 510080 Guangdong Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan 430074 Hubei Province China Guangdong Power Grid Co. Ltd. Guangzhou 510080 Guangdong Province China

Accurate modeling of stochastic wind power output is one of the key links in the optimal operation of power systems with large-scale wind power. According to the output characteristics of offshore wind farms, a data-driven method that models offshore wind power output scenarios is proposed in this paper. This method takes full account of the marine climate characteristics to study the offshore wind farm output data seasonally and identifies the main climatic elements affecting the output of offshore wind farms through correlation analysis. Meanwhile, the evaluation index of output characteristics is established. In order to reflect the influence of marine climate on the output of offshore wind farms, the climatic factors are used as an indicator to distinguish different weather. Accordingly, the output scenarios of offshore wind farms in extreme and non-extreme weather are determined, and the corresponding probability calculation method is proposed.

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Numerical study of transition between even and odd toroidal Alfvén eigenmodes on EAST

arXiv

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arXiv 2019年

作者： Hou, Yawei Kim, Charlson C. Zhu, Ping Zou, Zhihui Hu, Youjun Yan, Xingting CAS Key Laboratory of Geospace Environment Department of Engineering and Applied Physics University of Science and Technology of China Hefei Anhui230026 China KTX Laboratory Department of Engineering and Applied Physics University of Science and Technology of China Hefei Anhui230026 China SLS2 Consulting San DiegoCA92107 United States International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Institute of Plasma Physics Chinese Academy of Sciences Hefei Anhui230031 China

Linear simulations of toriodal Alfvén eigenmodes (TAEs) driven by energetic particles (EPs) on EAST (Experimental advanced Superconducting Tokamak) are performed using the hybrid-kinetic MHD (HK-MHD) model implemented in NIMROD code. The EAST equilibrium is reconstructed using the EFIT code based on experimental measurement. The "slowing down"distribution is adopted for modeling the equilibrium distribution of the energetic ions from the deuterium neutral beam injection on EAST. The frequency, the dominant poloidal mode number, the radial location and the detailed 2D mode structure of the TAE/RSAE/EPM modes are consistent between the eigenvalue analysis and the NIMROD simulation. As the β fraction of EP increases, a transition between even and odd TAEs occurs, along with that between the ballooning and anti-ballooning mode structures. When the β fraction of EP is close to the transition threshold, both types of TAEs coexist. Copyright © 2019, The Authors. All rights reserved.

关键词： Eigenvalues and eigenfunctions

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Research of an Axial Flux Stator Partition Hybrid Excitation Brushless Synchronous Generator.

Research of an Axial Flux Stator Partition Hybrid Excitation...

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International Conference on Magnetics (INTERMAG)

作者： C. Ye Y. Du J. Yang X. Liang F. Xiong W. Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

A vehicular generator has stringent requirements on its weight and volume. As a combination of permanent magnet and electric excitation motor, hybrid excitation machine could meet the requirements of vehicular generator, with small size, light weight, adjustable output voltage. In this paper, an axial flux stator partition hybrid excitation brushless synchronous generator (ASHG) is proposed. First, the structure and operation principle of ASHM is illustrated. Afterwards, the shape of the magnetic pole is optimized to obtain the air-gap flux density with low harmonic content. Moreover, the regulation performance of the magnetic field and output voltage are investigated by three dimensional finite element analysis (3D FEA). The result indicates that ASHG has a high performance of adjusting terminal voltage. It can improve the generator efficiency, power density and stability comparing with the conventional vehicular generator.

关键词： Magnetics Conferences

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Design an Analysis of a Water-Cooled Axial Flux Permanent-Magnet Machine for Large Power Direct-Driven Applications

Design an Analysis of a Water-Cooled Axial Flux Permanent-Ma...

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International Conference on Electrical Machines, ICEM

作者： Jian Li Yang Lu Yun-Hyun Cho Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology( Wuhan China Dept. of Electrical Engineering Dong-A University Busan South Korea

This paper presents a design process and a detailed multi-physics analysis of an axial flux permanent magnet synchronous machine for large power direct-drive applications. The machine in this paper is 130kW at 26 rpm with a dual-stator inner-rotor structure. A stator core which is assembled with segmented and pre-wound teeth is first proposed and applied in a large power axial flux PM machines. Through this method, the challenges of manufacturing large diameter AFPM machines can be solved. A novel water-cooling system is embedded in the machine to transfer the heat. In addition, assembling procedure and manufacture process are also proposed. Finally, based on the multi-physics design, a prototype machine is manufactured and tested. The experiment results match well with the finite-element analysis (FEA).

关键词： Windings Torque Stator cores Forging Solid modeling Welding

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