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4th International Particle Accelerator Conference, IPAC 2013

作者： Chen, Q. Hu, T. Qin, B. Zeng, H. Fu, Q. Wu, B. Pei, Y.J. Li, J. State Key Labratory of Advanced Electromagnetic Engineering and Technology HUST Wuhan China NSRL Hefei China Huazhong University of Science and Technology China

ISBN: (纸本)9783954501229

A linac-based Free Electron Laser is planned to be built in Huazhong University of Science and technology (HUST). As an important component of the linac, the focusing magnetic field is carefully designed. Spacecharge force is calculated at first to give a rough estimation of the focusing field. Start-to-end simulation shows that the magnetic field has only significant effect on spot size and phase space. With the final designed field, 3-ps-length (FWHM) pulse containing 200pC electrons can be obtained and the corresponding RMS normalized emittance and RMS radius are 7 πmm·mrad and 0.25 mm, respectively. Finally, a new double-peak scheme is discussed and excitation current is proposed as the evaluation index. Copyright © 2013 by JACoW.

关键词： Focusing

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Low-temperature, solution-processed hole selective layers for polymer solar cells

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ACS Applied Materials and Interfaces 2013年第3期5卷 1100-1107页

作者： Yao, Chuang Xu, Xinjun Wang, Jinshan Shi, Leilei Li, Lidong State Key Lab for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A new method is reported for preparing solution-processed molybdenum oxide (MoO3) hole selective layer (HSL). Via combustion processing at low annealing temperatures, the obtained MoO3 HSL exhibits a high charge-transporting performance similar to poly(ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) but overcoming its defect to device stability. The combustion precursor solution using ammonium heptamolybdate as the metal source, acetylacetone as a 'fuel', and nitric acid as an oxidizer can largely reduce the temperature for transformation of the polyoxomolybdate to α-phase MoO3. Furthermore, when a small amount of PEDOT:PSS has been introduced into the combustion precursor solution to improve the film morphology, the derived film can exhibit a flat and continuous surface morphology with coexistence of α- and β-MoO3 after being annealed at a low temperature (150 C). The simplicity, rapidness, and effectiveness of our method together with the low annealing temperature needed make it promising for the roll-to-roll manufacture of polymer solar cells. © 2013 American Chemical Society.

关键词： Polymer solar cells

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Preparation of bimetallic nanoparticles using a facile green synthesis method and their application

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Langmuir 2013年第15期29卷 4901-4907页

作者： Xia, Bihua He, Fang Li, Lidong State Key Lab for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A straightforward, economically viable, and green approach for the synthesis of well-stabilized Au/Ag bimetallic nanoparticles is described;this method uses nontoxic and renewable degraded pueraria starch (DPS) as a matrix and mild reaction conditions. The DPS acted as both a reducing agent and a capping agent for the bimetallic nanoparticles. Au/Ag bimetallic nanoparticles were successfully grown within the DPS matrixes, and the bimetallic structures were characterized using various methods, including high-resolution transmission electron microscopy, energy-dispersive X-ray, and X-ray diffraction. Moreover, it was shown that these DPS-capped Au/Ag bimetallic nanoparticles could function as catalysts for the reduction of 4-nitrophenol in the presence of NaBH 4 and were more effective than Au or Ag monometallic nanoparticles. © 2013 American Chemical Society.

关键词： X ray diffraction

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Stability of interacting grid-connected power converters

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Journal of Modern Power Systems and Clean Energy 2013年第3期1卷 249-257页

作者： Cheng WAN Meng HUANG Chi K.TSE Xinbo RUAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Department of Electronic and Information Engineering Hong Kong Polytechnic UniversityHong KongChina School of Electronic Engineering Wuhan UniversityWuhanChina College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjingChina

The power grid in a typical micro distribution system is non-ideal,presenting itself as a voltage source with significant ***,grid-connected converters interact with each other via the non-ideal *** this study,we consider the practical scenario of voltage-source converters connected to a three-phase voltage source with significant *** show that stability can be compromised in the interacting ***,the stable operating regions in selected parameter space may be reduced when grid-connected converters interact under certain *** this paper,we develop bifurcation boundaries in the parameter space with respect to Hopftype instability.A small-signal model in the dq-frame is adopted to analyze the system using an impedance-based ***,results are presented in design-oriented forms so as to facilitate the identification of variation trends of the parameter ranges that guarantee stable operation.

关键词： Power converters Stability analysis Interacting systems Grid-connected converters

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Influence of the Transverse Field Component on the Edge Efect in a Short-Gap Discharge

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Plasma Science and technology 2013年第11期15卷 1112-1115页

作者：叶齐政于大海蔡焕青邵瑰玮谭丹 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Collegeof Electrical and Electronic Engineering Huazhong University of Science and Technology State Grid Electric Power Research Institute

In a general plane-parallel electrode system the edge of the electrode will undermine the uniformity of the dielectric barrier discharge （DBD） because of the influence of the distorted electrical field. In this paper, the influence of the non-uniform electrical field on the edge effect of DBDs in a short-gap is investigated. We present some o.f the experimental results of DBDs produced by three kinds of convex-spherical electrodes. The results show that there is a dark area （the homogeneous discharge） in the central region of the electrode and a bright halo （the filamentary discharge） in the outer peripheral region, and the radius of the dark region is determined by the electrode geometry. The calculated results of the transverse （radial） field component distribution on the surface of the electrodes show that the edge effect does not come from the electrode edge, but the transverse field. The discharge has enough space to be fully developed and then format the filamentary discharge in the outer peripheral region because the streamer of the filamentary discharge is driven to move along the direction of the longer path by the transverse field. Thus, the homogeneous discharge （the Townsend DBD or a glow DBD） could not be produced in this area.

关键词： DBD edge effect transverse field

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Crystal structure and magnetic properties of SmCo_(6.6)Nb_(0.4) nanoflakes prepared by surfactant-assisted ball milling

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Journal of Rare Earths 2013年第10期31卷 975-978页

作者：潘蕊岳明张东涛高学绪刘卫强张久兴郭朝辉李卫 College of Materials Science and Engineering Beijing University of Technology State Key Lab of Advanced Metals and Materials University of Science and Technology Beijing Division of Functional Materials Central Iron and Steel Research Institute

SmCo6.6Nb0.4 nanoflakes with TbCu7 structure were successfully prepared by surfactant-assisted high energy ball milling （SA-HEBM） with heptane and oleic acid as milling medium. The microstructure, crystal structure and magnetic properties were stud- ied by scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometer, respectively. The effects of ball milling time on the c-axis crystallographic alignment and coercivity of the nanoflakes were systematically investigated. The research showed that the nanoflakes had an average thickness of 100 nm, an average diameter of 1 μm, with an aspect ratio as high as 100. As the ball milling time increased from 2 to 8 h, the reflection peaks intensity ratio I（002y/I（10l）, which indicated the degree of c-axis crystal texture of the SmCo6.6Nbo.4 phase, increased first, reached a peak at 4 h, and then decreased. Meanwhile, the coercivity of the nanoflakes also increased first, reached a peak at 13.86 kOe for 4 h, and then decreased.

关键词： SmCo6.6Nb0.4, nanoflakes high energy ball milling magnetic properties rare earths

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Study on the relationship between the size of resin sprue on GIS and intensity of UHF electromagnetic waves radiated from partial discharge

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 531-536页

作者： Wu, Siyang Ye, Qizheng Li, Xingwang Wang, Zengbin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou510600 China

Gas insulated switchgear (GIS) of different manufacturers have different size of resin sprue, and the size of resin sprue has direct effects on the ultra-high-frequency (UHF) electromagnetic waves motivated by partial discharge (PD), which brings about many difficulties in accurate estimate of the severity of PD. On the platform of a 252 kV GIS, we used UHF sensors which were mounted on resin sprues of different size that had been set up in advance to detect electromagnetic wave signals emitted by the needle-plane PD model in GIS and found that with an increase of the length of the long side of the sprue, the signal intensity enhances first and weakens later and get its maximum on 75 mm. Another simulation experiment which used pulse signal generator to provide excitation source for the transmitting antenna in GIS to simulate PD and detected signals in the same way to the former also found the same conclusion. The calculation results in XFDTD--an electromagnetic wave simulation software based on finite difference time domain (FDTD) method also proved the same conclusion. This conclusion offers important references for the options of the best size of resin sprue and development of external UHF sensor. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Partial discharges

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Improved model based predictive torque control strategy with fast dynamic response for flux-switching permanent magnet machines

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9th International Symposium on Linear Drives for Industry Applications, LDIA 2013

作者： Xu, Wei Yang, Wen Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology China Sichuan Deyang Electric Power Bureau China

ISBN: (纸本)9783037858639

The flux-switching permanent magnet machine (FSPMM) has got great attention by academic researchers during the past couple of years for its merits of strong mechanical robustness, high efficiency, strong thermal dissipation ability, etc. However, for its inherited double salient structure in both stator and rotor, the FSPMM suffers from severe torque and flux ripples at different rotor positions for its variable magnetic resistance, which cannot be solved completely only by electromagnetic optimal design. In order to increase the drive performance of FSPMM, such as dynamic response and stable torque smoothness, an improved model based predictive torque control (MPTC) algorithm is proposed. By using the cost function modulation strategy, the torque and flux ripples of FSPMM are reduced evidently, accompanying with the minimized converter switching frequency and power loss. Comprehensive simulation investigations are finally carried out to validate relevant theoretical analysis. © (2013) Trans Tech Publications, Switzerland.

关键词： Cost functions

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An economic dispatch model considering the volatility and uncertainty of wind power

An economic dispatch model considering the volatility and un...

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2013 IEEE PES Asia-Pacific Power and Energy engineering Conference, APPEEC 2013

作者： Xu, Chen Zhao, Feng He, Shan Shao, Chong Lin, Xiangning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Engineering and Renewable Energy School Three Gorges University Yichang China

ISBN: (纸本)9781479925223

The integration of reserve capacity allocation and wind power prediction probabilistic analysis is put forward to deal with the problems caused by wind power volatility and uncertainty. On this point the consequence of wind power is quantified and introduced to the wind power price compensation model. Based on this, taking the environmental benefits into consideration, sewage cost of thermal power units is counted and a more reasonable pricing model by statistic significance of power system dispatch with wind power is put forward. Example shows that this model can effectively reflect the impacts of different economic policy factors, and at the same time, proper allocation of the model could reduce the influence of wind power fluctuation and uncertainty, which will advance the sound development of wind power. © 2013 IEEE.

关键词： Wind power

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The design and tests of battery power supply system for pulsed flat-top magnets in WHMFC

The design and tests of battery power supply system for puls...

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作者： Ding, T.H. Lv, Y.L. Tang, J.X. Chen, X. Chen, X.Y. Li, L. Pan, Y. Wuhan National High Magnetic Field Center State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China

A capacitor bank power supply of 14.8 MJ is built in Wuhan National Pulsed High Magnetic Field Center (WHMFC). Another pulse generator power supply of 100 MJ/100 MVA is expected to be finished by the end of August, 2012. These power supplies can drive pulsed magnets with a magnetic field of 50 T to 80 T and a pulse duration of 15 ms to 1000 ms (Li et al. in IEEE Trans. Appl. Supercond. 18:596, 2008). In addition to that, a new battery bank power supply system is also designed. This system can output a maximum voltage of 1000 V, a maximum current of 40 kA and a pulse duration of 2 s to feed pulsed flat-top magnets of 40 T/2 s. This power supply consists of battery bank and its charger, thyristor DC switch and its forced commutation, DC breaker, control system, Crowbar, PWM controller and magnet. The battery bank uses 945 lead-acid batteries and its modular design makes it easy to modify the voltage and current of the power supply by changing the connections of the batteries based on the requirement of single-coil, double-coil and triple-coil magnets. The design and primary tests of the battery power supply system will be introduced in this paper (Schillig et al. in IEEE Trans. Appl. Supercond. 10:526, 2000). © 2012 Springer Science+Business Media New York.

关键词： Thyristors

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