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2013 19th IEEE Pulsed Power Conference, PPC 2013

作者： Wang, Yanzhao Lin, Fuchang Dai, Ling Yao, Xingchen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)9781467351676

One of the most important characteristic of triggered vacuum switch (TVS) is the breakdown voltage affecting the operation reliability of TVS. It depends on features, such as electrode material, electrode shape, gap distance and surface condition. For an optimized electrode's geometry, FEM electrostatic field simulations were conducted to evaluate the effect of geometric parameters on the electrostatic field strength and distribution. The distribution of electrostatic field of the TVS with multi-rod system is calculated by the finite method. The simulation results show that the geometric enhancement factor (GEF) is decrease with the increase of the fillet radius of the edge of the rod. In case of the fillet radius of the side face of rod 3mm and the fillet radius of the top face of the rod is 5mm, the GEF is up to the minimum value of 3. A lot of experiments are carried out. And the breakdown voltage of TVS with multi-rod system was measured by the high voltage direct current generator after switch currents with amplitude of 63kA and width of 13ms with the interval time of 10∼15min. The influences of electrode materials and operation times on the breakdown voltage are also studied. The experimental results show that the first breakdown voltage increased with the increasing of the operation times. And the breakdown voltage of CuCr (30%Cr) is higher than that of oxygen-free copper. © 2013 IEEE.

关键词： Electric breakdown

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electromagnetic-thermal modeling of electromagnetic brake using finite-element analysis

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5th International Conference on Mechanical and Electrical technology, ICMET 2013

作者： Zhang, Bo Chen, Qiao Cao, Quan Liang Ji, Kai Liu, Meng Yu Peng, Tao Li, Liang Wuhan National High Magnetic Field Center 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 Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corporation Wuhan China

ISBN: (纸本)9783037858349

A DC-excited high torque electromagnetic brake has been designed for high-speed train in WHMFC. An electromagnetic-thermal analysis model for electromagnetic brake analysis has been developed, taking into account the specific heat capacity-temperature relation, nonlinear magnetization-saturation and the skin effect. With simplification, the complex transient electromagnetic-thermal process has been successfully solved. This paper follows a previous work in which analysis was performed with electromagnetic analysis only. © (2013) Trans Tech Publications, Switzerland.

关键词： Thermoanalysis

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Design of active power filter with LLCL filter

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第SUPPL.1期28卷 203-208+223页

作者： Qi, Yu Peng, Li Wang, Qinghong Wu, Deliang Liu, Qian Zhang, Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Also School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China China Ship Development and Design Center Wuhan 430064 China

With series resonance occur though the inductor and capacitor, LLCL output filter could achieve better switching ripple filtering effect in the case of using less inductance obtained than LCL filter. This paper summarizes the LLCL filter parameters design method in the application of shunt active power filter, and passive damping characteristics are analyzed. It is propose that under the precondition of ensuring the stability, choose lower damping resistance to maintain the high switching ripple attenuation capacity. In terms of control, generalized integral controller is used to realize compensation of within 50 odd harmonic in power current. Finally, the simulation result proved the effectiveness of LLCL filter and generalized integral controller.

关键词： Controllers

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Sliding Mode Pulsewidth Modulation (SMPWM) for nine-switch converter

Sliding Mode Pulsewidth Modulation (SMPWM) for nine-switch c...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Yu Chen Gang Wen Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) and College of Electrical and Electronic Engineering (CEEE) Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467351942

Nine-switch converter, which can provide two sets of three-phase outputs with independent amplitudes, phases and frequencies, has been proposed to replace two independent three-phase converters for cost- and size-reduced purposes. This paper proposes a hysteresis-modulation (HM) sliding-mode (SM) pulsewidth modulation (PWM) for the nine-switch converter. With the proposed HM-SMPWM, the phase currents of the two sets of outputs can track to their current references directly. To do this, decoupled sliding surfaces for the two sets of outputs are structured; based on the sliding surfaces, the proposed SMPWM are detailed explained; the operational range is also discussed; finally the experiments are carried out to confirm the effectiveness of analysis.

关键词： Trajectory Pulse width modulation Hysteresis Frequency conversion Frequency modulation Manifolds

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Experimental Study on Arc Duration under Different Atmospheres

Experimental Study on Arc Duration under Different Atmospher...

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第十三届国际机电装置会议(IS-EMD2013)

作者： Chen LI Zhenbiao LI Qian WANG Du LIU State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong Univ.of Science & TechnologyWuhan430074P.R.China

To clarify the dependence of arc duration on atmosphere, experiments were conducted under conditions of air, N2, Ar, He and CO2 with the pressure of 0.1MPa in a 14V/28V/42V circuit re spectively.A quantitative relationship between arc duration and gas parameters such as ionization po tential, thermal conductivity was obtained from the experimental ***, the inherent mechanism of influence of atmosphere on arc duration was discussed.

关键词： atmosphere arc duration quantitative relationship

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Research of the damping technology based on magnetic fluid

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第SUPPL.1期28卷 96-99+114页

作者： Yang, Wenrong Wang, Qiang Qin, Jiafeng Li, Chunrui Yang, Qingxin Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic University Tianjin 300387 China

A new structure of damper based on magnetic fluid was proposed in the paper. The working principle and the damping property of the damper were analyzed. To simulate the levitation height of the permanent magnet in the magnetic fluid, the finite element method was adopted, obtained the curve that the levitation height of the permanent magnet changed with its diameter and length. To abtain the factors that affected the damping properties, the experiment tested the damping properties of magnetic fluid dampers in different specifications, analyzed the results of the experiment, found out the relationship between the damping properties and the original state of the cantilever as well as the size of the permanent magnet.

关键词： Permanent magnets

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Thermal analysis of air-core power reactors

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ISRN Mechanical engineering 2013年第1期2013卷

作者： Yuan, Zhao He, Jun-Jia Pan, Yuan Yin, Xiao-Gen Ding, Can Ning, Shao-Fei Li, Hong-Lei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

A fluid-thermal coupled analysis based on FEM is conducted. The inner structure of the coils is built with consideration of both the structural details and the simplicity;thus, the detailed heat conduction process is coupled with the computational fluid dynamics in the thermal computation of air-core reactors. According to the simulation results, 2D temperature distribution results are given and proved by the thermal test results of a prototype. Then the temperature results are used to calculate the heat flux to predict the detailed heat transfer process in the packages of the reactors. The study in this paper may be useful in the design optimization in air-core reactors. © 2013 Zhao Yuan et al.

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Mechanism of insulation resistance in metalized polypropylene film capacitors

Mechanism of insulation resistance in metalized polypropylen...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Hua Li Zhiwei Li Fuchang Lin Yaohong Chen De Liu Bowen Wang Haoyuan Li Qin Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology HUST Wuhan P. R. China

Metalized polypropylene film capacitors (MPPFCs) can work under high electric fields due to the self-healing characteristic. Leakage phenomenon caused by the insulation resistance (IR) in MPPFCs is one of the important factors resulting in the reduction of the energy efficiency. The IR is directly related to the DC electric conduction mechanism in polypropylene film. This paper mainly concentrates on the IR by investigating the electrical conduction mechanism of metalized films under high electric fields. Firstly the conduction mechanism of metallized films is discussed. Secondly IR is obtained under different electric fields based on an established measurement platform The Poole-Frenkel(PF) model presented in this paper includes the field-enhanced carrier density caused by the barrier height attenuation in directions both opposite and forward to the electric field, and the field-enhanced carrier mobility. The equation for electric conductivity based on this model gives not only the usual Ohm's law at low fields but also at extremely high electric fields. And the IR calculations match well with the experimental results.

关键词： Electric fields Conductivity Films Capacitors Resistance Current measurement

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Studying on dimensional standardization of UHF partial discharge detection system

Studying on dimensional standardization of UHF partial disch...

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2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013

作者： Hong, L. Qizheng, Ye Xingwang, Li Qifu, Lu Zhiguo, Tang Tian, Chen Electric Power Research Institute of Guangdong Power Grid Corporation Guangdong 510080 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781479925964

In the ultra-high-frequency (UHF) partial discharge (PD) detection system, many physical quantities, such as voltage, charge, power and their normalization, were used to describe the UHF PD signal. The standardization of the dimensional has not been investigated thoroughly. Based on the PD forming mechanisms, the pulse transient electric field was presented as a main physical quantity in this paper. The minimum pulse transient electric field, which could be differentiated by the UHF PD detection system, was adopted as the sensitivity of detection system. The sensitivities of four detection systems were measured by GTEM platform, and comparison tests for Spike discharge in GIS were made. The experimental results were in accordance with the sensitivity of detection system. © 2013 IEEE.

关键词： Standardization

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The Experimental Research on a Small Size Magnetic Coupling Resonance Wireless Energy Transmission System

The Experimental Research on a Small Size Magnetic Coupling ...

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第十五届中国科协年会

作者： YANG Xinsheng ZHAO Jun XU Guizhi LI Xuan LI Wei LI Yang Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic

With the progress of technology,more and more small household electrical appliances,implanted devices and other electronic equipment have been widely *** energy supply problem has restricted the development of electronic equipment,especially for implanted *** coupling resonance wireless energy transmission system is a new wireless energy transmission mode and it can realize the middle distance power transmission so it can solve the problems *** this paper,Ansoft software was used to simulate the electric field distribution of the magnetic coupling resonance *** the same time experiments were carried out to make the system into air,simulating human tissue fluid and a piece of pork respectively to compute the transmission *** result shows that the system can satisfy the power requirement of implanted device and so on,so it has broad application prospect.

关键词： wireless energy transfer vivo implanted device magnetic coupling resonance small-sized resonator transmission efficiency

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