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IEEE Symposium on Fusion engineering

作者： D. H. Xia C. H. Liu Z. J. Wang M. Zhang W. Zheng L. Q. Jiang D. L. Sun Z. Zeng F. T. Cui Z. X. Yu G. Zhuang K. X. Yu Y. Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

As a flexible and controllable auxiliary heating method, electron cyclotron resonance heating and current drive has been widely used in various plasma confinement devices and also will be used on J-TEXT. The main parts of the J-TEXT electron cyclotron systems under development are donated by the Culham Science Center, including six 60 GHz/200 kW/5 s (0.5 s) gyrotrons, six magnets and auxiliary power supplies for the gyrtrons, transmission parts, etc. For these systems, the output mode of the gyrotron is TE_(02) mode and converted to TE_(01) mode for low loss transmission. Then the HE11 mode for efficient coupling is obtained at the end of the transmission lines by a TE_(01) - TE_(11) - HE_(11) mode conversion sequence. A 100kV/60A pulse step modulation power supply has been developed to feed all the six gyrotrons. The control system based on the Compact Reconfigurable I/O - 9068 platform of National Instruments for monitoring, timing and protection is being designed. Other units such as the cooling loops, a new quasi-optical launcher and a spared auxiliary power supply are on the way. It is hoped that four to six EC subsystems can be finally used on the J-TEXT tokamak, and the first one is scheduled to be completed at the end of 2015.

关键词： J-TEXT tokamak ECRH rebuilding

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Comparison of stator DC-excited vernier reluctance machines with synchronous reluctance machines

Comparison of stator DC-excited vernier reluctance machines ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Shaofeng Jia Ronghai Qu Jian Li Yu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Stator DC-excited vernier reluctance machines (DC-VRMs) are vernier reluctance machines equiped with additional DC field winding in stator to generate the exciting field, a rotating field similar to synchronous reluctance machines (SynRMs). This paper compares the electromagnetic performance of two non-PM reluctacne machines including DC-VRMs and SynRMs. First, the basic operation principle of DC-VRMs and SynRMs are briefly reviewed. Then, four machine models, two DC-VRMs and two SynRMs are designed and optimized for comparison. For a fair comparison, the phase current, current density, slot fill factor and dimensions including the stator outer diameter, air gap and stack length are designed the same. The electromagnetic performance including flux density, torque quality, overload capacity, power factor and losses are compared in detail.

关键词： Windings Torque Stator windings Harmonic analysis Rotors Reluctance machines

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Optimal design of a direct-driven permanent magnet synchronous wind generator

Optimal design of a direct-driven permanent magnet synchrono...

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IEEE International Conference on Industrial technology (ICIT)

作者： Pedram Asef Tianjie Zou Haiyang Fang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Low-speed high-torque direct-drive permanent magnet (LSHTPM) synchronous machines, which are characterized by large dimensions and weight, have huge potential for wind power generation. Despite to this fact, before the manufacture process of these machines, optimal design should be done to reduce the material costs and maximize power density and efficiency. In this paper, t he attention is focused on an optimal design of a 1.5MW direct-drive wind generator which is done in this research. The relationships between main dimensions of the machine and its power density, efficiency are investigated. In addition, a novel analytical optimization method is used to find optimal aspect ratio and split ratio to maximize power density and efficiency. The influences of electrical and magnetic load on the optimal aspect ratio and split ratio are also explored. Other parameters and results that may have major influence on the main dimensions such as pole number, slot width, and etc. are carried out and also discussed.

关键词： Current density Generators Density measurement Power system measurements Stator windings Stress

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Short-term Frequency Support of Power System From Wind Farms Using Energy Storage System

Short-term Frequency Support of Power System From Wind Farms...

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IEEE Power and Energy Society General Meeting

作者： Ju Liu Wei Yao Jinyu Wen Yao Long State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467380416

The high penetration of non-dispatch-able, grid-connected wind power is bringing serious challenge to the frequency regulation of power systems because of the decoupling between the output power of doubly-fed induction generator-based wind farms and the grid frequency. Therefore, this paper proposes a compensation strategy to help wind farms to support the system frequency response by using the energy storage system. Firstly, the conclusion that the wind farm, which is equipped an energy storage system with 5% rated power of wind farm, could have similar short-term frequency response ability as synchronous generators with the same capacity is deduced. Then, a fuzzy logic controller is designed for the energy storage system to achieve this. Simulation results of a simplified practical power system show that wind farms with the proposed compensation strategy could response to the frequency change of power system rapidly and support the short-term frequency regulation effectively under various disturbances.

关键词： Energy storage Frequency regulation Fuzzy logic control Wind farms Short-term frequency support

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Improved discretization-based decoupled feedback control for series connected converter of SCC

Improved discretization-based decoupled feedback control for...

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International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： Jing Shi Kang Gong Yang Liu Xiao Zhou Yue Jin Tang Li Ren Jing Dong Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467381086

The active superconducting current controller (SCC) adopts the principle of series voltage compensation, which can be utilized to limit the fault current effectively during fault conditions. This paper presents an improved discretization-based decoupled feedback control for series connected converter of SCC. To improve the system dynamics of discretization-based decoupled feedback control, the effect of the control time delay is considered. Furthermore, a linear state feedback loop which considering the output error vectors is added to the control system to achieve the feature of deadbeat. MATLAB simulation is performed to evaluate the performance of the proposed control.

关键词： Feedback control Mathematical model Delay effects Superconductivity Voltage control State feedback

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Stateflow based carrier phase-shifted SPWM and its application in DT-STATCOM

Stateflow based carrier phase-shifted SPWM and its applicati...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Haihuan Wu Xianggen Yin Jinmu Lai Jian Dai Zhe Zhang Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Combining switching characteristics of power electronic devices and state transitions in carrier phase-shifted SPWM (CPS-SPWM), this paper uses graphic Stateflow toolbox of Matlab/Simulink to design the process of CPS-SPWM. Then it is applied to STATCOM which is integrated with distribution transformer (DT-STATCOM) for PWM signal generation. Simulation results are presented to prove that the method is valid and effective for reactive power compensation. Meanwhile, software-in-loop (SIL) test and automatic code generation are also carried out. Results of experimental test with DSP TMSF28335 have validated the theoretical contributions of the paper. PWM signal comparison of both simulation and experiment result shows that this method has both the feasibility and effectiveness of software and hardware design. With this method, design of CPS-SPWM can be more rapid, efficient and convenient.

关键词： Pulse width modulation Mathematical model Switches MATLAB Reactive power Digital signal processing

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Research on permanent magnet synchronous motor with segmented permanent magnet used for spindle

Research on permanent magnet synchronous motor with segmente...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaojie Wang Kai Yang Zhicheng Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei China

ISBN: (纸本)9781479988068

The paper presents a novel interior permanent magnet machines used for spindle drive where wide constant power speed range is necessary. To obtain wide constant power speed range, segmented permanent magnet was adopted. And finite element analysis is used to verified the flux weakening capability of design. Besides, in order to check the influences of segmented permanent magnet on cogging torque, it was also analyzed by finite element analysis.

关键词： Permanent magnets Decision support systems Finite element analysis Forging Torque Permanent magnet motors Magnetic flux

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A peak load regulation scheme for Hubei power grid with UHVDC integration

A peak load regulation scheme for Hubei power grid with UHVD...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Ni Zeng Mei Li Buhan Zhang Ruoxi Zhu Minwei Wang Shuang Zhao Chengxiong Mao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Under the background of transmitting thermal power via UHV transmission line from Mengxi to Hubei in the long-term planning, this paper analyzed Hubei power grid's peak load regulation scheme which Mengxi UHVDC involved in. Based on the energy-efficient power generation scheduling approach and multiple constraints of units, a peak load regulation scheme under the coordinated operation of thermal power, hydropower, pumped-storage and UHVDC power in a calculating level year was given. It is indicated that the peak regulation capacity shortage problem in Hubei is solved effectively with Mengxi UHVDC integration.

关键词： Thermal loading Hydroelectric power generation Decision support systems Energy efficiency Power industry Thermal analysis

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A consequent pole, dual rotor, axial flux vernier permanent magnet machine

A consequent pole, dual rotor, axial flux vernier permanent ...

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International Conference on Ecological Vehicles and Renewable Energies (EVER)

作者： Tianjie Zou Ronghai Qu Jian Li Dawei Li Leilei Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

A consequent pole, dual rotor, axial flux vernier permanent magnet (VPM) machine is developed to reduce magnet usage and increase torque density. Its end winding length is much shorter than that of regular VPM machines due to its toroidal winding configuration. The configurations and features of the proposed machine are discussed. Benefited from its vernier and consequent pole structure, this new machine exhibits much higher back-EMF and torque density than that of a regular dual rotor axial flux machine, while the magnet usage is halved. The influence of main design parameters, such as slot opening, ratio of inner to outer stator diameter, magnet thickness etc., on torque performance is analyzed based on the quasi-3-dimensional (quasi-3D) finite element analysis (FEA). The analyzing results are validated by real 3D FEA.

关键词： Reliability engineering Windings Stator windings Stator cores

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Optimization of the lattice function in the planar undulator applied for terahertz FEL oscillators

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Chinese Physics C 2014年第3期38卷 72-77页

作者：杨磊秦斌杨军刘遐龄谭萍胡桐宁 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Since the beta function of the electron beam within the undulator has a great influence on the power gain of the free electron laser（FEL）,optimization of the undulator lattice becomes *** this paper,the transfer matrix of the planar undulator is obtained from differential equations of the electron *** on this,the lattice function of the planar undulator in a terahertz FEL oscillator proposed by Huazhong University of Science and technology（HUST-FEL） is optimized and the expressions of the average beta function are *** accuracy of the optimization result was confirmed well by the numerical *** application range of this analytical method is given as *** last,the emittance growth in the horizontal direction due to the attenuation of the magnetic field is discussed.

关键词： planar undulator beam transport lattice optimization

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