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A Design of WSN and EPON Applied in Online Monitoring for Transmission Line

A Design of WSN and EPON Applied in Online Monitoring for Tr...

引用

2014 4th International Conference on Materials,Mechatronics and Automation(ICMMA 2014)

作者： Xu Chen Zhe Du Xianggen Yin Pan Wei Liqiang Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Electric Power Research Institute of Hunan Power Grid Corporation

Natural disasters like icing have a strong impact on the power transmission line which is the foundation of safety and stability operation for power system. In this paper, an online transmission line monitoring and patrol system based on Wireless Sensor Network(WSN) and Ethernet Passive Network(EPON) is firstly designed and a model is built to analyze the latency influenced by the number of towers using EPON communication technology which is solved by Lingo 11.

关键词： Monitoring system Overhead transmission line Wireless sensor network Optical fiber composite overhead ground wire Zigbee

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Design of the Power Supply for the Pulsed Electric Current Sintering

Design of the Power Supply for the Pulsed Electric Current S...

引用

第26届中国控制与决策会议

作者： Jiangtao Shi Lei Yao Binbin Ni Qi Chen Jianfeng Xie Xiaotao Han Wuhan National High Magnetic Field Center Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781479937097

The pulsed electric current sintering(PECS) is a new rapid sintering technique. As an important part of the PECS system, the pulsed electric current power supply is one of the main factors which affect the sintering result. This paper proposes a pulsed electric current power supply topology based on phase-shift full-bridge converter, which implements ZVS(zero voltage switching). By controlling the PWM output, it implements such variety output modes as pulse mode, DC mode and Pulse-DC mode. The power supply can output 700 A current and 14 V voltage. Its output pulse width is a minimum of 2ms, and can be adjusted by the user.

关键词： PECS,Pulsed Electric Current Power Supply,Phase-Shift Full-Bridge Convertor,Zero Voltage Switching

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Loss and permeability characterization of Fe-based nanocrystalline cores for pulsed power magnetic applications

Loss and permeability characterization of Fe-based nanocryst...

引用

IEEE Symposium Power Modulator

作者： Yi Liu Yibo Han Siwei Liu Fuchang Lin Huazhong University of Science and Technology Wuhan Hubei CN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

Fe-based nanocrystalline cores are widely used in pulse transformers, magnetic switches, inductors, and filters in pulsed power. A test stand was developed to measure the energy losses and pulse permeability of toroidal Fe-based nanocrystalline cores. In this paper Fe-based nanocrystalline cores with high and low residual flux were tested and compared. The initial magnetizing curves and maximum hysteresis loops were obtained under a relatively constant magnetization rate of the order of 1-8 T/μs. The loss density and unsaturated permeability are calculated based on the experimental results. The loss density and permeability are fitted and compared with the published data in a similar parameter space. The presented results of Fe-based nanocrystalline cores can be aided in the practical magnetic designs of magnetic switches, pulse transformers, and inductors, but not restricted to those.

关键词： Magnetization Permeability Magnetic flux Saturation magnetization Magnetic hysteresis Transformer cores

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Field studies on the Inrush Current for 33/11kV transformer and the effect on voltage interruption during switching operation of 10MW wind farm

Field studies on the Inrush Current for 33/11kV transformer ...

引用

IEEE PES Transmission and Distribution Conference and Exposition

作者： Owolabi Sunday Adio Xiangning Lin Jinwen Sun Pengyu Yang Muhammad S. Khalid Dji-Dkoio Izuchukwu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology(HUST) Wuhan 430074 China Wuhan University of Technology Wuhan 430074 China

The Inrush Current for transformer switching operation study is an electromagnetic transient analysis (EMT) and are performed in order to investigate the network response after the energized the two 33/11 kV, 7.75MVA transformers in the Layafa S/S. The Inrush current associated with transformer energizing can cause some reactions that may adversely affect other loads in the power networks system, for instance voltage sags or over-voltage phenomena which could cause nuisance tripping for protective devices or loads. Protection devices may mis-interpret these events as fault currents, if the protection devices are not properly coordinated well. In this paper, the inrush current analysis was performed for the generators-transformers of the wind farm switching operation. In the study analysis, the 33/11 kV transformers will not be energized at the same time. Each transformer will be energized at no load condition, with the tap changer set to the maximum step of the HV side (higher voltage) in order to minimize the inrush current values. The simulation analysis was performed which the aid of DigSilent and EMT computer simulation to establish this study while considering the minimum short circuit power in the grid and the Wind Farm disconnection from the system. This paper is based on the field results test of the newly installed wind farm generator-transformer in relation to network interruption on the 33 kV and 11 kV systems during the switching on operation especially transient voltage phenomena.

关键词： Surges Transient analysis Magnetic flux Mathematical model Circuit faults Surge protection Switches

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Design and simulation of a novel brushless Doubly-Fed Alternator for the pulse Capacitor Charge Power Supply

Design and simulation of a novel brushless Doubly-Fed Altern...

引用

electromagnetic Launch technology

作者： Yuan Cheng Qingming Xin Caiyong Ye Xianfei Xie Zhenxiu Lou Yigang He School of Electrical Engineering and Automation Hefei University of Tcchnology Hefei China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper presents a new type Brushless Doubly-fed Alternator (BDFA) based on the differential mode and conducts research on its application in a pulse Capacitor Charge Power Supply (CCPS). Because there are no brushes, the Brushless Doubly-fed Alternator will have high reliability and long service life. The excitation winding of the BDFA which is set on stator can be supplied with either Direct Current or Alternating Current. In previous studies, regardless of the rotor configuration, the natural speed of BDFA is 60f / (p1+ p2), i.e. based on the additive mode. In order to increase the alternator's natural speed, expand the operating and control range and promote the alternator's power density, this paper presents the differential mode, i.e. its natural speed is 60f /|p1-p2|. We will introduce the detailed design method of BDFA based on the differential mode. Utilizing the finite element model of the alternator, we will analyze the magnetic field distribution and calculate inductance parameters of the BDFA, and then the inductance mathematic model of the BDFA will be established. We also establish the simulation model of the pulse CCPS. Finally, we will verify the feasibility of design scheme for the BDFA through the simulation results in a pulse CCPS system. Index Terms: Brushless Doubly-Fed Alternator (BDFA); Differential Mode; Finite Element; Capacitor Charge Power Supply (CCPS).

关键词： Windings Rotors Stator windings Harmonic analysis Mathematical model Inductance Alternators

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Fuzzy Comprehensive Evaluation for Transmission Grid Planning Based on Combination Weight

Fuzzy Comprehensive Evaluation for Transmission Grid Plannin...

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2014 International Conference on Power and Energy(ICPE 2014)

作者： Z.H.LI Y Lin W.H.Chen D.H.You G.Wang M.L.Dong Q.R.Chen Y.Zou J.Hu Guangdong Power Grid Development Research Institute Co. Ltd State Key Laboratory of Advanced Electromagnetic Engineering and Technology of Huazhong University of Science and Technology

In order to remedy the defect that the determination of weight in fuzzy comprehensive evaluation is impacted by subjectivity, the combination weight is introduced. In this paper, the optimization Model combines the subjective weight and objective weight, which is solved by PSO, is built. At the same time, In order to give full consideration to the uncertain and fuzzy factors which involved in the grid planning, this paper combines the combination weight and fuzzy comprehensive evaluation to assess the grid-planning scheme. The calculation results of IEEE Garver-6 show that the proposed fuzzy comprehensive evaluation system is clear in theory and convenient to calculate, the combination weight is objective and reasonable as well as its results are scientific and intuitive.

关键词： grid planning scheme fuzzy comprehensive evaluation combination weight particle swarm optimization algorithm

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Analysis of electromagnetically Induced Acoustic Emission Under Different Magnetic Field conditions

Analysis of Electromagnetically Induced Acoustic Emission Un...

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2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New technology & Application Increasingly perfect NDT/E

作者： Zhichao CAI Suzhen LIU Chuang ZHANG Qingxin YANG Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University

The ability of acoustic emission detection is enhanced by electromagnetic stimulation with external magnetic *** magnetic field directions,which are generated by permanent magnet,produce various vibrations of defect *** this paper,the deformation characteristics of electromagnetically induced acoustic emission(EMAE)are studied by the finite element method(FEM).The experimental data are compared by the signal reprocessing of sample entropy(Samp En),which under the condition of parallel and vertical magnetic *** main conclusion is that characteristics of AE varied significantly under different magnetic field conditions,which provides crucial references for EMAE ***,this study leads to ratiocination that the application of parallel magnetic field reduces the demands of the power supply and improves the detection efficiency.

关键词： EMAE deformation parallel magnetic field vertical magnetic field

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Analytical calculation of damper winding losses in large hydrogenerators

Analytical calculation of damper winding losses in large hyd...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Yun Lu Jianjun Liu Libing Zhou Huilin Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China Dongfang Electric Machinery Co. Ltd. China

ISBN: (纸本)9781479951635

The damper winding is one of the key components of hydro generators. At steady load conditions, currents are induced in the damper winding due to the harmonic field in the air-gap, which lead to parasitic losses in generators. This paper describes an analytical method for calculation of currents and power losses in the damper winding. The described method is based on harmonic analysis of the air-gap magnetic field and the equivalent circuit of the damper winding. The obtained analytical results are compared with values by 2-D transient finite element (FE) studies.

关键词： Shock absorbers Harmonic analysis Windings Air gaps Stator windings Rotors

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Novel faulty feeder identification scheme in the Neutral Un-effectively Grounded distribution networks

Novel faulty feeder identification scheme in the Neutral Un-...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Lin, Xiangning Kursan, Ivan Sun, Jinwen Li, Zhengtian Zheng, Rongjin Bo, Zhiqian Xu, Jianfei Wei, Zhongkang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Fujian University of Technology No3Xueyuan Road University Town Minhou Fuzhou City Fujian Province China Xujigroup Corporation Beijing 100000 China State Grid Jibei Electric Power Company Limited Beijing 100053 China

ISBN: (纸本)9781849198349

The selection of the faulty feeder in the case of single phase- to-earth fault in a Neutral Un-effectively Grounded System (NUGS) has been one of the conventional problems of distribution network. The compensation method is introduced to highlight the difference of the zero-sequence admittances between the faulted feeder and the sound feeder. In this way, the setting of the criterion becomes feasible. The on-site requirement to the protection is also involved in this paper. A variety of simulation tests were carried out by virtue of ATP software. The results demonstrate that this algorithm is immune to the variation of network structures and parameters, fault conditions, and fault resistance etc. The successful rate of feeder selection is proved to be improved to a great extent.

关键词： Electric power distribution

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Fault section identification based on per-unit zero sequence current

Fault section identification based on per-unit zero sequence...

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12th IET International Conference on Developments in Power System Protection, DPSP 2014

作者： Lin, Xiangning Kursan, Ivan Sun, Jinwen Li, Zhengtian Zheng, Rongjin Bo, Zhiqian Xu, Jianfei Wei, Zhongkang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Fujian University of Technology No3 Xueyuan Road University Town Minhou Fuzhou City Fujian Province China Xujigroup Corporation Beijing 100000 China State Grid Jibei Electric Power Company Limited Beijing 100053 China

ISBN: (纸本)9781849198349

Although single phase to ground fault location in non-solid grounded networks has been studied for many years and a lot of research has been done, yet adequate solution for direct fault location of radial distribution network hasn't been made, especially for the distribution network with the neutral point grounded via arc suppression coil. Involvement of the arc suppression coil may decrease short-circuit current, but the difficulty of finding fault location is increased. The key problem of non-solid single-phase to ground fault location is to solve the fault location of distribution network with the neutral point grounding via arc suppression coil. This paper will analyse line capacitive current distribution of isolated neutral point and neutral point grounded via arc suppression coil and propose the concept of per-unit zero sequence current method. Equipartition principle of zero sequence current is utilized to locate fault section of the distribution system. Simulation tests to verify the effectiveness of this method have been made as well.

关键词： Electric grounding

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