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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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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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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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Remote control system for tokamak based on web service

Remote control system for tokamak based on web service

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2013 IEEE 25th Symposium on Fusion engineering, SOFE 2013

作者： Zheng, Wei Zhang, Ming Li, Guang Zhang, Jing Zhuang, Ge State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781479901715

To fully utilize the tokamak facility, it is necessary to allow researchers to remotely participate in the tokamak experiments via the internet. To be able to control the operation of the tokamak is one of the key. In this paper, the design and implementation of the remote control system for the J-TEXT tokamak is presented. To make this system flexible, instead of just providing software or web site that controls the tokamak, we choose to expose a series of Application Programming Interfaces (APIs) as web services. All the operation of the J-TEXT tokamak is wrapped in these services. The remote control web site is based on these services, and users can easily build their own web sites or remote control rooms which consume these services to operate the J-TEXT tokamak. An authorization and authentication system is included so the users will not be able to consume the services which they are not supposed to. The remote control system is EPICS compatible and has been integrated into the J-TEXT CODAC System. © 2013 IEEE.

关键词： Websites

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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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Physicial design of beam transport line of a compact terahertz fel

Physicial design of beam transport line of a compact teraher...

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4th International Particle Accelerator Conference, IPAC 2013

作者： Zeng, Han Chen, Qushan Fu, Qiang Qin, Bin Wu, Bang Feng, Guangyao Xiong, Yongqian Pei, Yuanjie State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China NSRL University of Science and Technology of China Hefei 230029 China

ISBN: (纸本)9783954501229

The single pass, linac-based compact terahertz source at HUST is now in the physical design stage. To match Twiss parameters and dispersion function of the electron beam at the undulator entrance and get smaller beta function in the whole line, several lattices based on the double bending achromat(DBA) structure were discussed and the optimized design is given with beam dynamics results-calculated by MAD and Trace 3D. Copyright © 2013 by JACoW.

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Magnet design and analysis of a 40 tesla long pulse system energized by a battery bank

Magnet design and analysis of a 40 tesla long pulse system e...

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作者： Lv, Y.L. Peng, T. Wang, G.B. Ding, T.H. Han, X.T. Pan, Y. Li, L. Wuhan National High Magnetic Field Center Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan 430074 China

A 40 tesla long pulse magnet and a battery bank as the power supply have been designed. This is now under construction at the Wuhan National High Magnetic Field Center. The 22 mm bore magnet will generate smooth pulses with duration 1 s and rise time 0.5 s. The battery bank consists of 945 12V/200 Ah lead-acid battery cells. The magnet and battery bank were optimized by codes developed in-house and by ANSYS. The coil was made from soft copper with internal reinforcement by fiber-epoxy composite;it is divided into two sections connected in series. The inner section consists of helix coils with each layer reinforced by Zylon composite. The outer section will be wound from copper sheet and externally reinforced by carbon fiber composite. © 2012 Springer Science+Business Media, LLC.

关键词： Magnets

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Vector control of brushless doubly-fed machine for high power stand-alone power generation

Vector control of brushless doubly-fed machine for high powe...

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2013 International Conference on Applied Mechanics, Mechatronics and Intelligent System, AMMIS 2013

作者： Ji, Kai Gao, Yue Zhu, Jun Huang, Sheng Hua Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corporation China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9783037857625

In this paper, a novel variable speed constant frequency brushless doubly-fed induction generator system using back-to-back multilevel converters for high power stand-alone power generation is described. According to control target, the unified reference-frame model is used to develop an improved forced power stator flux oriented vector control strategy. The similarities and differences between the grid-connected and stand-alone topology and control strategy are also specialty analyzed and compared. Simulation results prove the feasibility and validity of the proposed model, theoretical analysis and excellent performance of the proposed control scheme. © (2013) Trans Tech Publications, Switzerland.

关键词： Vector control (Electric machinery)

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Microgrid economic dispatch considering electric vehicles integration

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第SUPPL.1期28卷 62-67+86页

作者： Chen, Changsong Duan, Shanxu Cai, Tao Liu, Bangyin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

Plug-in electric vehicles (PEVs) integration will pose inevitable impacts on the planning and operation of microgrid system in the future. The microgrid economic dispatch model (MEDM) considering electric vehicles integration is presented and the impact of different charging and discharging modes on microgrid economic operation is analyzed. The charge and discharge power of the PEVs and the output of the distributed generation units were scheduled and the objective function is to minimize a combination of the operation cost as well as the power purchase costs of PEV users. An improved genetic algorithm optimization module was proposed to achieve the optimization. Application of the proposed energy management model on a small microgrid system shows the validity of the method and the computation results can be used to evaluate the impact of PEV charge and discharge modes on economical performance of microgrids.

关键词： Plug-in electric vehicles

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