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IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

作者： Haoyin Bai Chengzu Li Jun Liu Guoliang Huang Jinbo Jiang Mengbing He State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

On the basis of the principle of magnetic pulse compression (MPC), a new magnetic pulse compression system based on magnetic switch (MS) is designed. The MPC system omits the external remagnetization circuits of the magnetic switch, and this prominent advantage can not only reduce the volume of magnetic switch, but also make the whole MPC unit more simple and compact. Detailed analysis of the working principle of this MPC system is presented. In this MPC device, we utilize the prominent advantage of magnetic switch to improve the turn-on and insulation recovery characteristics of gas switches, which can increase the repetition rate and life time of gas switches effectively. A device of this type has been successfully applied to switching a 6Ω resistive load. The current pulse produced on this load has a rising time about 500 ns and its peak value and duration are 508 A and 1.5 μs, respectively. And the operating frequency of a three electrodes switch can reach to 200 Hz.

关键词： Switches Magnetic cores Saturation magnetization Magnetic circuits Magnetic materials Photonic crystals Switching circuits

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Mirnov coils system on the J-TEXT tokamak

Mirnov coils system on the J-TEXT tokamak

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第十五届全国等离子体科学技术会议

作者：何炎丁永华金雪松陈真真庄革潘垣 State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology

Two poloidal arrays and a toroidal array of Mimov coils are developed on the J-TEXT tokaraak to measure the magnetic fluctuations and study external MHD *** the Mimov coils data,the mode stmcture and frequency can be detected and analyzed for the J-TEXT *** Singular Value Decomposition(SVD) technique has been successfully applied to the Mimov coils data to determine(m,n) of the mode.

关键词： J-TEXT Mirnov coils magnetic fluctuation mode structure

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An electron microscopy study of the effect of Ce on plasma sprayed bronze coatings

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Journal of Physics: Conference Series 2012年第1期371卷

作者： Li Wensheng S C Wang Chao Ma Wang Zhiping State Key Laboratory of Advanced Nonferrous Materials Lanzhou University of Technology Lanzhou 730050 China National Centre for Advanced Tribology at Southampton School of Engineering Sciences University of Southampton SO17 1BJ UK

The Cu-Al eutectoid alloy is an excellent material for mould due to its superior low friction. The conventional sand casting technique, however, is not feasible to fabricate high Al bronze because of high hardness and brittleness. Plasma arc spray has been used to produce high Al/Fe bronze coatings for mould. The inherent impurities such as H, O, N, S during the spray, however, may affect the coating's mechanical strength. One approach is to utilise the active rare earth Ce to clean up these impurities. The study is to investigate the effect of Ce on the microstructure, which has few reported in the literature.

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Fault location in distribution networks using Prony analysis

Fault location in distribution networks using Prony analysis

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International Conference on advanced Power System Automation and Protection (APAP)

作者： JinRui Tang Yin XiangGen Zhang Zhe He ZhiQin Ye Lei Yuxue Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Hubei Electric Power Security and High Efficiency Key Lab Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes a new fault location method in distribution networks using Prony analysis. This method just needs the measured voltage transients without multi-recording nodes. Fault-originated traveling waves propagate along the distribution network and reflect at the discontinuity points, so the recorded transients contain some characteristic frequencies associated with specific paths, which can reveal the fault position. Firstly, model and simulate the distribution network using PSCAD/EMTDC to get the recorded signals associated with the typical fault positions. Secondly, extract the frequencies of the recorded signal using Prony analysis to generate the database for fault location. Finally, the real fault-originated signal will be analyzed to locate the fault point by searching the database for fault location based the matching rule. The matching rule is the least squares between the frequencies of the real fault-originated signal and the frequencies corresponding one typical fault position in the database. The simulation results demonstrate that the method is practical, reliable and effective.

关键词： Fault location Circuit faults Transient analysis Databases Time frequency analysis Power systems

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Injection of Electron via E×B Drift to Assist Initiation on the J-TEXT tokamak

Injection of Electron via E×B Drift to Assist Initiation on...

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第十五届全国等离子体科学技术会议

作者：王能超丁永华岑义顺刘德全黄海金海庄革潘垣 State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology

It is considered that the plasma breakdown is relevant to the initial density of free *** electron injection system via E15;B drift aimed at increasing the initial free electrons is designed and constructed on the ... 详细信息

It is considered that the plasma breakdown is relevant to the initial density of free *** electron injection system via E×B drift aimed at increasing the initial free electrons is designed and constructed on the J-TEXT tokamak to investigate this *** experiments demonstrated that the system works well and some improvement has been obtained at start-up scenario.

关键词： tokamak start-up initial free electrons electric field drift electron injection

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An Investigation on the active power variations of wind farms

An Investigation on the active power variations of wind farm...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Weixing Lin Jinyu Wen Shijie Cheng Wei-Jen Lee State Key Laboratory Advanced Electromagnetic Engineering and Technology (AEET) Wuhan China University of Texas Arlington Arlington USA

ISBN: (纸本)9781424494989

Variation is one of the most important inherent characteristics of wind power. No common method exists on defining the variations quantificationally. This presents difficulty for power system security and efficiency operation if large-scale wind power is included. Based on the analysis results for large amounts of field measurements from 52 wind farms, it has been found that the method of the t location-scale distribution is able to cope with this problem. A systemic methodology is proposed accordingly. Therefore, characteristic of the variations for the wind power could be appropriately represented.

关键词： Histograms

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Advance on non-equilibrium plasma jets and their bio-medical applications

Advance on non-equilibrium plasma jets and their bio-medical...

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2011年第三届微电子及等离子体技术国际会议

作者： XinPei Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology HuaZhong University of Science and Technology WuHan 430074 P.R. China

cause of the enhanced plasma chemistry,atmospheric pressure nonequilibrium plasmas (APNPs) have been widely studied for several emerging applications such as biomedical applications.

关键词： Atmospheric pressure plasma plasma jet cancer cell biofilm

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Switched reluctance generation control over wide speed range applied to flywheel energy storage system

Switched reluctance generation control over wide speed range...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Yi Chen Jianbo Sun Shuanghong Wang Huangyuan Wu Guoyun Ning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China Hubei DAYU Electric Company Limited China

Due to the characteristics of high reliability, wide speed scope with high efficiency, and low cost, Switched Reluctance Generator (SRG) system is suitable for applications in the field of variable-speed constant-voltage generation, such as wind power generation, flywheel energy storage, electric vehicle, aircraft power generator, etc. In this paper, a nonlinear dynamic model of SRG system is established, including switched reluctance machine and power circuit. Furthermore, a control plan of variable-speed constant-voltage generation is designed, which covers a wide speed range. Simulation results show that the SRG system has favorable dynamic and static characteristics.

关键词： Reluctance motors Switches Voltage control Mathematical model Simulation

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Implementation of a high-speed switched reluctance starter/generator system

Implementation of a high-speed switched reluctance starter/g...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Jianbo Sun Zhe Kuang Huangyuan Wu Shuanghong Wang Guoyun Ning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China Hubei DAYU Electric Company Limited China

Switched Reluctance Motors (SRMs) show great advantages of structural simplicity and high reliability in aerial starter/generator applications. This paper introduces the implementation of a high speed switched reluctance starter/generator system. First, the paper proposes a modeling method for switched reluctance starter/generator system, including switched reluctance machine and power circuit. The simulation model is constructed based on magnetic finite element analysis and electromechanical dynamic equations, which considers magnetic saturation and electromechanical coupling. Then, the control parameters of the system are optimized according to maximum efficiency of the machine, and a novel control strategy is proposed to achieve generating operation of the system over a wide speed range. Finally, both simulation and experimental results are shown to validate the performance of the system.

关键词： Reluctance motors Switches Mathematical model Power generation Integrated circuit modeling Generators

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A novel doubly salient generator with fully pitched winding structure

A novel doubly salient generator with fully pitched winding ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Jianbo Sun Yi Chen Huangyuan Wu Shuanghong Wang Guoyun Ning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China Hubei DAYU Electric Company Limited China

Conventional short-pitched winding switched reluctance machine realizes the electromechanical energy conversion by utilizing only the rising region of phase inductance at motoring mode, or the descending region of phase inductance at generating mode. Compared with the conventional switched reluctance machine, the fully-pitched winding machine realizes the electromechanical energy conversion by utilizing both the rising and the descending regions of the mutual inductances among the phase windings. Thus, the fully-pitched winding switched reluctance machine shows more advantageous than the conventional switched reluctance machine. This paper proposes a novel generating control strategy of a three-phase fully-pitched winding switched reluctance machine, by introducing the generating operation principle of doubly salient electromagnetic machine into fully-pitched winding switched reluctance machine. With the novel control strategy, the fully-pitched winding doubly salient generator can afford convenient voltage-adjustable control without rotor angular position sensor. It is of low cost, high reliability, favorable voltage control, and shows great competitive in the applications, such as wind power generation, wave energy generation, flywheel energy storage, etc. The simulation and test results verify the novel strategy of fully-pitched winding doubly salient generator.

关键词： Windings Reluctance motors Couplings Voltage control Rotors Torque

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