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2nd International Conference on Mechanical engineering, Industrial Electronics and Informatization, MEIEI 2013

作者： Wang, Bo Wang, Ke You, Da Hai Chen, Wei Hua Wang, Gang State Grid HBEPC Economic and Technology Research Institute Wuhan 430077 Hubei Province China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

ISBN: (纸本)9783037858905

In this paper an genetic algorithm-extreme learning machine (ELM) based real-time transient stability assessment method is proposed. This method uses genetic algorithm (GA) to search optimal input weights and hidden biases in the principle of cross validation to establish GA-ELM classifier. In order to do real-time transient stability assessment, generator trajectories of rotor angle, rotor speed, voltage magnitude, electromagnetic power and imbalance power in-and post-disturbance are chosen as original features for the quick access based synchronously sampled values. Simulation results of New-England 39-bus system show that this method has good performance in power system transient stability assessment. © (2013) Trans Tech Publications, Switzerland.

关键词： Genetic algorithms

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New giant magnetostrictive force sensors

New giant magnetostrictive force sensors

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4th International Conference on Manufacturing Science and technology, ICMST 2013

作者： Yan, Rong Ge Zhu, Li Hua Yang, Qing Xin 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

ISBN: (纸本)9783037858677

Force sensors, based on the giant inverse magnetostrictive effect, have a series of outstanding properties, such as large overload capacity, which make them have more and more applications to the field of automatic control system of heavy industry, chemical industry. This paper designs new giant magnetostrictive force sensors using the rare-earth iron giant magnetostrictive materials. With the designed giant magnetostrictive force sensor, the relations between magnetic flux density in the gap and applied static stress on the sensor, the inductive voltage in the coil and time (with the dynamic stress), are calculated by finite element analysis software. The related confirmatory experiments have been conducted. The experimental results indicate that the giant magnetostrictive force sensor is fit for static and dynamic force measurement. In order to enlarge the measurement range, the designed force sensor as the basic cell is combined. This paper gives two kinds of combinations, which have the feature of adjustable range. © (2013) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Circuit analysis and control of the DC power supply system for dynamic resonant magnetic perturbation coils on the J-TEXT tokamak

Circuit analysis and control of the DC power supply system f...

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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： W.B.Zeng Yonghua Ding H.Y.Xu B.Yi B.Rao M.Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Four groups of in-vessel saddle coils have been installed on J-TEXT tokamak *** DC power supply(PS) system for dynamic resonant magnetic perturbation coils(DRMP) has been designed and put into operation *** non-circul... 详细信息

关键词： Circuit analysis and control of the DC power supply system for dynamic resonant magnetic perturbation coils on the J-TEXT tokamak

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Plasma response to supersonic molecular beam injection in J-TEXT

Plasma response to supersonic molecular beam injection in J-...

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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： J.S.Xiao Z.J.Yang G.Zhuang M.H.Liu State Key of Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Recently,hydrogen fueling experiments with Supersonic Molecular Beam Injection (SMBI) system were performed on the J-TEXT *** these experiments, besides the density increasing,several interesting phenomenon were *** the first place,when moderate SMB used,electron density increased with a large margin, accompanying that the scale of magnetic island slightly *** rotation,which measured by the velocity of CV ion with a spectroscopy(r/a= 0.7-0.8),accelerated from 8km/s to 12km/s(counter-current direction) during SMBI.A higher electron density than pre-SMBI maintained for long period,indicating plasma confinement may *** another hand,while the amount of SMB is sufficient enough,it can trigger the tearing *** the electron density increased *** of CV ion decreased,even reversed towards co-current *** electron temperature changed like non-local have been ***,we need to find more evidence to prove it.

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Research on excitation control for stand-alone wound rotor brushless doubly-fed generator system

Research on excitation control for stand-alone wound rotor b...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xin Chen Xuefan Wang Fei Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

ISBN: (纸本)9781479914456

Brushless doubly-fed generator (BDFG) as a stand-alone power generation has a wide application of variable speed constant frequency (VSCF) generator in some embedded generation systems, such as ship shaft generator systems. In this paper, an excitation control strategy for stand-alone BDFG is introduced, the similarities and differences of system structure and control strategy between the grid-connected and stand-alone BDFG are also analyzed and compared. Under stand-alone situation, the quality of stator power winding output voltage is strongly affected due to active and reactive power component of load, to tackle this problem, the steady equivalent-circuit and power flow of the BDFG is comprehensively developed and analyzed. The experiments included in this paper were carried out on a 4/8-pole 64kW wound rotor BDFG.

关键词： Rotors Generators Voltage control Stators Vectors Shafts Load flow

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Shielding Effectiveness of Composites Containing Flaky Inclusions

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高电压技术 2013年第8期39卷 1995-1999页

作者： WANG Qingguo QU Zhaoming WANG Yilong Institute of Electrostatic & Electromagnetic Protection Mechanical Engineering College Shijiazhuang 050003 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

To investigate the quantitative relationship between the electromagnetic-shielding property of composites and the distribution of inclusions, a scheme for predicting the shielding effectiveness of composites containing variously-distributed flaky inclusions is proposed. The scheme is based on equivalent parameters of homogeneous comparison materials and the plane-wave shielding theory. It leads to expli- cit formulas for the shielding effectiveness of multi-layered composites in terms of microstructural parameters that characterize the shape, distribution and orientation of the inclusions. For single layer composite that contains random and aligned flaky silver-coated carbonyl-iron particles with fractions of different volume, the predicted shielding effectiveness agrees well with the experimental data. As for composites containing aligned flaky particles,the shielding effectiveness obtained by the proposed scheme and experiment data is higher than that the random case, e.g. about 20 dB higher at 750 MHz. The proposed scheme is a straightforward method for optimizing future composite de- signs.

关键词：多层复合材料屏蔽效能夹杂物片状微观结构参数实验数据羰基铁粒子电磁屏蔽

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Reduction of Eddy Currents by Inserting High Permeability Materials

Reduction of Eddy Currents by Inserting High Permeability Ma...

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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： Hai Jin Yonghua Ding Bo Rao Nengchao Wang Bin Yi Maoyue Zheng Quanlin Li Shujia Xie Ge Zhuang Yuan Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

A set of dynamic resonant magnetic perturbation(RMP) coils is installed inside the vacuum vessel to investigate the interactions between rotating RMP and the plasma on the J-TEXT *** coils are designed operating at a frequency up to several kilohertz. A large eddy current will be induced in the vessel wall and will bring about a strong attenuation of the magnetic field of the ***,in order to reduce the screening effect of the eddy current on the magnetic field,a proposal of inserting soft magnetic material blocks with high permeability between RMP coils and the vacuum vessel wall is put *** the segmented soft magnetic material blocks with high permeability between coils and the vacuum vessel wall,the magnetic field configuration is improved on one side of the vacuum vessel wall,most of the magnetic force lines pass into the magnetic material,and less into the vessel *** to these material with a high permeability,the magnetic force line 'attracted' by blocks around the materials,thereby reducing the eddy currents in the vacuum vessel wall,and the segmented insulating magnetic materials can't form a loop,thus the eddy currents induced in the material is relatively small,so that the magnetic field of the critical area is enhanced *** to verify the proposal have been carried out in the vacuum vessel,and the preliminary results indicate that the proposal is *** more detailed results will be given at the conference.

关键词： Reduction of Eddy Currents by Inserting High Permeability Materials

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Techniques of torque ripple minimization in design optimization of the Electrical Spindle Motor

Techniques of torque ripple minimization in design optimizat...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Zhingcheng Pan Yang Kai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

The Permanent Magnet (PM) Electrical Spindle Motor is an important component in high speed Computer Numerical Control (CNC) machine tools. This paper provides a process to design a high-performance electrical spindle motor, concerning on the motor torque density and torque ripple. Considering the practical design constraints, the design and optimization are accomplished using 2D-FEA. In order to reduce the torque ripple, several methods, such as step-skewed rotor, slot skewing and auxiliary slot are discussed in this paper [1], and some analysis and comparison of the methods are displayed.

关键词： Torque Permanent magnet motors Optimization Rotors Synchronous motors Induction motors Permanent magnets

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A novel fault location method for electrical distribution systems based on characteristic frequencies

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International Journal of Applied Mathematics and Statistics 2013年第21期51卷 340-348页

作者： Tang, Jinrui Yin, Xianggen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

This paper proposes a novel fault location method for electrical distribution systems based on characteristic frequencies, which uses solely the measured voltage transients without multi-recording nodes. Fault-generated traveling waves propagate along the distribution network and are reflected at the discontinuity points, so the recorded transients contain some characteristic frequencies associated with specific paths. Firstly, the recorded transients are analyzed by fast Fourier transform (FFT). Secondly, the sub-frequency bands are identified and the energy values of all sub-frequency bands are figured out. Then the fault position can be located based on the energy values. PSCAD/EMTDC and MATLAB are used for the simulation validation work and the sensitivity and the influencing factors of this method are analyzed. The simulation results have proved the effectiveness of the method. © 2013 by CESER Publications.

关键词： Fast Fourier transforms

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Reactive power compensation of the distribution power system with distributed generation using improved Tabu search algorithm

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2013 International Conference on Advances in Materials Science and Manufacturing technology, AMSMT 2013

作者： Lei, Xiang Li, Yan Wang, Shao Rong Zhao, Hong Zhou, Fen Chen, Zeng Sheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology China Huazhong University of Science and Technology Wuhan 430074 Hubei Province China Foshan Electric Power Design Institute Co. Ltd Foshan 528000 Guangdong Province China

ISBN: (纸本)9783037857984

Taking account of the mutual impacts of distributed generation and reactive power, to determine the optimal position and capacity of the compensation device to be installed, the paper proposed an improved Tabu search algorithm for reactive power optimization. The voltage quality is considered of the model using minimum network active power loss as objective Function. It is achieved by maintaining the whole system power loss as minimum thereby reducing cost allocation. On the basis of general Tabu search algorithm, the algorithm used memory guidance search strategy to focus on searching for a local optimum value, avoid a global search blindness. To deal with the neighborhood solution set properly and save algorithm storage space, some corresponding improvements are made, thus, it is easily to stop the iteration of partial optimization and it is more probable to achieve the global optimization by use of the improved algorithm. Simulations are carried out on standard IEEE 33 test system and results are presented. © (2013) Trans Tech Publications, Switzerland.

关键词： Distributed power generation

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