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

作者： Feng Hong Jinfu Chen Jian Zuo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab Huazhong University of Science and technology 430074 Wuhan China

The unsolvable power flow problem is one of the basic issues in dispatching automation, which frequently appears in the process of grid mode planning and Optimal Power Flow (OPF) analysis. To deal with this problem, a practical adjustment method based on grid weak point is proposed in this paper. This method use “lower power injection” method to calculate a similar power flow solution which also the system maximum load level in unsolvable case. According this solution, the system weak point can be found by the index based on local system operation parameters and external equivalent system model. Combined with sensitivity analysis to reschedule the active power of generators and reactive power compensation devices, so as to make the system maximum load level increase, eventually get the system power flow solution at the original load level. This method overcome the large calculation of optimize algorithm in unsolvable power flow problem and can be applied to large practical grid. In the meantime, this method has clear physical interpretation, operator can be involved during the process, have great value in application. The method is tested on IEEE14 nods system.

关键词： Gold IP networks Generators Sensitivity Robustness

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Stress and Thermal Analysis of In-Vessel Resonant Magnetic Perturbation coils on J-TEXT Tokamak

Stress and Thermal Analysis of In-Vessel Resonant Magnetic P...

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第十五届全国等离子体科学技术会议

作者： Hao Changduan Zhang Ming Jng Yonghua Rao Bo Cen Yishun Zhuang Ge State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

A set of 4 in-vessel saddle coils are designed to generate a helical field onJ-TEXT tokamak to study the influences of external perturbation field to *** will be fed with alternating currents up to 1 0 kA at frequencies up to 1 0 *** the special structure,thermal environment and limited space in the vacuum chamber,it is of great essential to make sure that the coils will not be damaged whenundertaking the huge electromagnetic forces in the strong toroidal field and theirtemperatures don’t rise too much to destroy the insulation.A 3D finite element modelis developed by the ANSYS code in this paper,stresses are analyzed in the worstcondition,then a mounting method is *** results of the elastic and modalanalyses show that the mounting method meets the strength *** that,athermal analysis is performed to study the cooling process and the temperaturedistribution of the coils.

关键词： J-TEXT tokamak resonant magnetic perturbation coils finite element analysis

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Design of An Air-core Transformer Used for Pulse Current System

Design of An Air-core Transformer Used for Pulse Current Sys...

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第十五届全国等离子体科学技术会议

作者： LI Xingqun Zhang Ming Liu Minghai Zhuang Ge Chang Jiang Deng Shan State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and Technology Wuhan 430074 Huibei ProvinceChina

Pulse current technology has been widely used in plasma *** the low rate of rise of on-state current,the ordinary thyristor can be rarely used in pulse current *** order to reduce the requirement of current rising rate of the switch,in this *** design a cylindrical air-core transformer for pulse plasma systems whose load can be usually equivalent to an inductor of low *** to the cored *** has the advantages of simple structure and no *** verifying the feasibility,we set up a testing system which consists of a 2.5kV/20μF capacitor,an ordinary thyristor and an air-core transformer which is shorted with an essentially inductive wire in the *** this *** the capacitor is discharged via the switch,the rate of current rising of the primary and secondary windings is 37A/μs and 138A/μs ***,the current rising rate of switch is 3.73 times lower than the load while the designed value is *** to the result of experiment,it is proved that making use of air-core transformer is an effective way to decrease the requirement of current rising rate of the switch.

关键词： plasma air-core transformer thyristor pulse power system

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Mechanical monitoring and risk assessment under ice disaster based on wireless sensor network

Mechanical monitoring and risk assessment under ice disaster...

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IEEE Power engineering and Automation Conference (PEAM)

作者： Yingtong Liu Xianggen Yin Jian Xu Zhenxing Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China Faculty of Electrical Engineering Wuhan University of China Wuhan Hubei China

ISBN: (纸本)9781424496914

Ice disaster has becoming a significant threat to power system security since recent years. Wireless sensor networks guarantee reliability of information communication under ice disasters, due to their self-organization and the advantage that master stations are not involved. It is recommended to be applied on power grid structure security monitoring and assessment. It is proposed that different type of sensor nodes should be settled on overhead transmission lines, to comprehensively monitor mechanical status of a certain area. A two-layer sensor network model is presented for overcoming the communication range limitations of sensor nodes. Using the data obtained, a novel power system financial risk assessment method is proposed to balance the probability and seriousness of icing caused supports break, which helps grid structure progress in a long term.

关键词： Conductors Poles and towers Ice Monitoring Accidents Wireless sensor networks Meteorology

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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： HE Yan DING Yonghua JIN Xuesong CHEN Zhenzhen ZHUANG Ge PAN Yuan CHINA-USA Joint Fusion Laboratory J-TEXT Huazhong University of Science and TechnologyWuhanChina 430074 State Key Laboratory of Advanced Electromagnetic Engineering and Technology WuhanChina

Two poloidal arrays and a toroidal array of Mimov coils are developed on the J-TEXT tokamak to measure the magnetic fluctuations and study external MHD *** the Mimov coils data,the mode StnlCture and frequency can bc 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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Pulsed power expansion and compression using mutual coupling

Pulsed power expansion and compression using mutual coupling

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International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC)

作者： Mengbing He P Senior State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China Department of electronic and electrical engineering Loughborough University Loughborough Leicestershire UK

A familiar technique for shortening the length of discharge from a capacitor in a pulsed power circuit involves a combination of opening and closing switches. Lengthening the pulse normally involves using a number of relatively small capacitors, interconnected through inductors, with the resulting arrangement often being complex. The paper describes how using a capacitor as the energy source, it is possible to use the same basic and straightforward assembly of mutually- coupled inductors and switches to provide either pulse shortening or extension, merely by means of a different switching sequence. The concepts underlying both possibilities are explained and typical experimental results are presented.

关键词： Equations Switches Capacitors Mathematical model Inductance Inductors Discharges

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Minimum Load-curtailment in Transmission Network Planning Considering Integrated Wind Farms

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中国电机工程学报 2011年第34期31卷 I0003-I0003,5页

作者： CHEN Yan WEN Jinyu CHENG Shijie State Key Laboratory of Advanced Electromagnetic Engineering and Technology （Huazhong University of Science and Technology） Wuhan 430074 Hubei Province China

提出应用鲁棒线性优化理论来研究电网规划中含多个风电场的最小切负荷量计算问题,为含多个风电场的系统安全性研究提供了一条新的思路。根据Seng-Cheol Kang提出的鲁棒线性优化理论,建立电网规划中考虑风电场影响的最小切负荷量模型。... 详细信息

提出应用鲁棒线性优化理论来研究电网规划中含多个风电场的最小切负荷量计算问题,为含多个风电场的系统安全性研究提供了一条新的思路。根据Seng-Cheol Kang提出的鲁棒线性优化理论,建立电网规划中考虑风电场影响的最小切负荷量模型。该模型以出力上下限和出力期望值来描述风电场的出力,最终转化为一确定性的线性规划问题并进行求解。在计及或不计及发电机调整的情况下,该模型均能够给出最安全的切负荷方案,除此以外还能给出更多介于最可靠与最经济之间的切负荷方案,实现灵活决策;在计及发电机出力可调的情况下,该模型能够给出相应的发电机出力方案;该模型能够初步给出各种切负荷方案下电网规划方案的可靠程度。基于修正的Garver’s 6节点系统和修正的巴西南部46节点系统算例测试结果验证了该方法的有效性。

关键词：英文摘要内容介绍编辑工作期刊

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Injection of Electron via ExB Drift to Assist Initiation on the J-TEXT tokamak

Injection of Electron via ExB 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： WANG Nengchao DING Yonghua CEN Yishun LIU Dequan HUANG Hai JIN Hai ZHUANG Ge PAN Yuan CHINA-USA Joint Fusion Laboratory J-TEXT. Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan 430074China

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

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

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A double C-shaped three-dimensional metamaterial absorber

A double C-shaped three-dimensional metamaterial absorber

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第十五届全国等离子体科学技术会议

作者： Guodong Wang Minghai Liu Xiwei Hu Xiaoqin Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physics Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physicsHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China

The absorbing property of a three—dimensional metamaterial operating at 12.7GHz is investigated numerically by the model of double C-shaped metallic stripes,which are printed on the each side of a dielectric cube *** carefully adjusting the dimensions of the metamaterial structure,the metamaterial simultaneously has both negative electric and magnetic response to an incident electromagnetic(EM)wave,and can exhibit left—handed property in a frequency rang with negative permittivity and permeability ***,Full-wave EM simulation demonstrates that it carl achieve over 99.6%absorption at 1 2.7GHz with a 0.4GHz full width at half *** metamaterial structures are scalable to operate a significant portion of the EM spectrum spanning from radio to the near optical *** metamaterial can ease design and fabrication,especially at high *** proposed absorber possesses many potential applications such as bolometer,sub—wavelength imaging,and microwave absorption.

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Soft X-ray Pulse Height Analysis System on J-TEXT Tokamak

Soft X-ray Pulse Height Analysis System on 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：金伟庄革丁永华张扬张静陈忠勇林士耀许平孔伟 State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT College of Electric and Electronic EngineeringHuazhong University of Science and Technology Institute of Plasma Physics Chinese Academy of Science Department of Modern Physics University of Science and Technology of China

A soft X-ray pulse height analysis(PHA) system has been designed and installed on J-TEXT tokamak for the study of electron temperature and *** system contains three Silicon Drift Detectors(SDD),a multi-channel analyzer(MCA), vacuum chamber,data collection procedure and off-line data processing program.A 60ms temporal resolution of electron temperature and the line radiation from moderate and high Z metallic impurities can be obtained by PHA *** on this system the performances of electron temperature and impurity have been investigated in J-TEXT ohmic heated plasmas.

关键词： soft-x-ray PHA J-TEXT

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