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Erratum: “Design and test of a flat-top magnetic field system driven by capacitor banks” [Rev. Sci. Instrum. 85, 045106 (2014)]

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Review of Scientific Instruments 2014年第4期85卷

作者： Fan Jiang Tao Peng Houxiu Xiao Jianlong Zhao Yuan Pan Fritz Herlach Liang Li 1Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan China 2State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China 3Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven Belgium

The original paper1 was published online on 7 April 2014, and the information of corresponding author and the electronic mail of corresponding author were misse

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A novel kind of monitoring and analyzing system for digital substation functional loop

A novel kind of monitoring and analyzing system for digital ...

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Zhigang Lai Peng Mao Xiangning Lin Ning Tong Chong Chen Fengwei Tian Maintenance Branch State Grid Jiangxi Electric Power Company Nanchang China Laboratory of Advanced Electromagnetic Engineering and Technology HUST Wuhan China Huazhong University of Science and Technology Wuhan Hubei CN

ISBN: (纸本)9781479925230

Currently, the schedule preparation of condition-based maintenance for the secondary devices in digital substation highly relies on the information supporting of the condition monitoring. In this paper, a novel kind of real-time condition monitoring and analyzing system for the functional loop applied in the digital substation is introduced. Based on the data captured in the network of process level by the collecting unit, an analyzer is equipped in a higher level in order to get the configuration of the digital substation, and furthermore, this virtual linkage of functional loop is displayed and updated on the client as undirected graphs. Using these graphs and with the help of the information in the offline database, this system can offer estimation results for the MTTF of a certain functional loop, which makes contribution to the digital substation condition-based maintenance in real-time.

关键词： Substations Software Monitoring Maintenance engineering Real-time systems Databases Hardware

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Networked Predictive Control Based Wide-Area Supplementary Damping Controller of SVC with Communication Delays Compensation

Networked Predictive Control Based Wide-Area Supplementary D...

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IEEE Power and Energy Society General Meeting

作者： Wei Yao L. Jiang J. Y. Wen S. J. Cheng Q. H. Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan 430074 China Department of Electrical Engineering & Electronics The University of Liverpool Liverpool L69 3GJ UK

ISBN: (纸本)9781479913022

This paper presents the design of a networked predictive control (NPC) based wide-area supplementary damping controller (WSDC) of SVC in order to damp the inter-area low frequency oscillations in large-scale interconnected power system. The major advantage of the proposed WSDC is that it can compensate constant and random communication delays existing in wide-area signals in an active way. Moreover, a recursive leastsquares algorithm (RLSA) with a variable forgetting factor is applied to identify the predictive model of the power system to overcome the model inaccuracies and uncertainties. Case studies undertaken on a two-area four-machine power system with a SVC device installed show that the proposed WSDC can provide better damping performances than the conventional WSDC especially when the wide-area signals exist communications delays.

关键词： Wide-area supplementary damping controller static var compensator (SVC) networked predictive control wide-area measurement system communication delays. Wide area measurement systems Static VAr compensators Neural network predictive control Communication Research absorption of shock power systems compensated Predictive control Controllers

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

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Plasma Science and technology 2012年第1期14卷 83-88页

作者： HAO Changduan ZHANG Ming DING Yonghua RAO Bo CEN Yishun ZHUANG Ge College of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan 430074China

A set of four in-vessel saddle coils was designed to generate a helical field on the J- TEXT tokamak to study the influences of the external perturbation field on plasma. The coils are fed with alternating current up to 10 kA at frequency up to 10 kHz. Due to the special structure, complex thermal environment and limited space in the vacuum chamber, Jt is very important to make sure that the coils will not be damaged when undergoing the huge electromagnetic forces in the strong toroidal field, and that their temperatures don＇t rise too much and destroy the in- sulation. A 3D finite element model is developed in this paper using the ANSYS code, stresses are analyzed to find the worst condition, and a mounting method is then established. The results of the stress and modal analyses show that the mounting method meets the strength requirements. Finally, a thermal analysis is performed to study the cooling process and the temperature distribution of the coils.

关键词： J-TEXT tokamak resonant magnetic perturbation （RMP） coils finite ele- ment analysis （FEA）

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Digital control and implementation of PWM rectifier for four-quadrant cascade inverter

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第SUPPL.1期28卷 493-500页

作者： Qiu, Changqing Huang, Shenghua Li, Zhuyan Shuang, Bo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

This paper proposes a control strategy of PWM rectifier for four-quadrant cascade inverter. Firstly, through analysis of the impact of the output power fluctuation of H-bridge inverter on the stability of the DC bus voltage and PWM rectifier control, a self-adjusting notch filter is added to the voltage outer loop. To reduce the impact of the variation of the AC side parameter on the control system, a proportional resonant (PR) controller is implemented to the current inner loop. And then, digital realization of the PR controller and the notch filter with direct form structure based on delta operator are achieved and the design principles of the key parameters are given. Finally, the experimental verification of PWM rectifier and its control strategy has a good four-quadrant performance in steady-state and transient operation under the rectification and inversion.

关键词： Notch filters

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XPower system transient stability analysis and critical cutset detection based on branch ridge

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第11期28卷 X262-269页

作者： Wang, Ke You, Dahai Yin, Xianggen Ye, Lei Huang, Ruoyin Wu, Junchun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

Effective online power system transient stability analysis and critical cutset detection method has important significance for the safe and stable operation of interconnected power system. Aiming at the disadvantages of the PEBS(potential energy boundary) method based on branch potential energy, a high reliable method named Branch RIDGE method is proposed in this paper for power system transient stability analysis and critical cutset detection. Also, a simple stability index of branch and system and a method to detect the stability status and critical cutsets of power system based on BPR and branch stability index are proposed. This method is established on the dynamic response trajectories of power system network information. In the case of known parameters of network structure, the method only needs real-time data of bus voltage magnitude and phase angle to do online power transient stability analysis and critical cutset detection. Because the method doesn't make assumption of two group instability mode, this method can be used in multi-swing instability and multi-group instability mode. The simulation on New England 10 machines show the validation of the proposed method.

关键词： Potential energy

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Research on electromagnetic Environment to Chest via Witricity

Research on Electromagnetic Environment to Chest via Witrici...

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第十五届中国科协年会

作者： ZHAO Jun YANG Xinsheng XU Guizhi LI Wei LI Yang DONG Chao Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic China SINOMACH Heavy Industry Corporation Beijing 100102China

Magnetic coupling resonance wireless energy transmission (Wireless electricity,Witricity) is a new technology put forward by MIT in *** achieves middle distance wireless energy transmission through magnetic coupling resonance and it has good application prospect in the field of implantable *** specific absorption rate (SAR) is applied to express the magnitude of electromagnetic energy which is absorbed by local tissue of human *** this paper a small size resonator was designed and the experiment results show that the small size Witricity system can transmit energy *** SAR is calculated by finite difference time domain (FDTD) method through building 3D numerical model of chest and implantable *** show that when transporting energy to chest implantable devices via Witricity,the maximum SAR value for 1g and 10g organism are 0.4543W/kg and 1.0729W/kg respectively which are both below international limit value.

关键词： magnetic coupling resonance implantable devices finite different time domain SAR

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Thermal Analysis and Design of the Cryogenic System for 12MW offshore Superconducting Wind Turbine

Thermal Analysis and Design of the Cryogenic System for 12MW...

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The 5thInternational Conference on Cryogenics and Refrigeration ICCR 2013(第五届国际低温制冷会议)

作者： Xiaoyu Li Jie He Li Ren Meng Song Kunnan Cao Dada Wang Jingdong Li Yuejin Tang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan430074P.R China Yunnan Electric Power Research InstituteKunming650217P.R China

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Character Diagnosis for Surface-Wave Plasmas Excited by Surface Plasmon Polaritons

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Plasma Science and technology 2012年第8期14卷 754-758页

作者：陈兆权夏广庆刘明海胡业林郑晓亮李平周启燕胡希伟 College of Electrical&Information Engineering Anhui University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

The plasma parameters of planar-type surface-wave plasmas （SWPs） are diagnosed based on the resonant excitation of surface plasmon polaritons （SPPs）. The plasma parameter distributions are obtained by changing the discharge conditions of gas pressure and incident power. The measured experimental results show that the plasma near the heating layer is excited by surface waves of SPPs while the plasma located downstream originates from diffusion Moreover, the influence of high-frequency oscillations plays a significant role in producing the proposed SWPs with bi-Maxwellian electron energy distributions.

关键词： surface-wave plasmas plasma diagnosing surface plasmon polaritons

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THz Spectrum Deconvolution with Total Variation Regularization

THz Spectrum Deconvolution with Total Variation Regularizati...

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International Congress on Image and Signal Processing

作者： Lizhen Deng Hu Zhu Guanming Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Jiangsu Province Key Lab on Image Processing & Image Communication Nanjing University of Posts and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781479927654

Deconvolution has become one of the most used methods for improving spectral resolution, and blind deconvolution as a typical method has been researched widely. However, the predefined point spread function (PSF) used in blind deconvolution method is not known exactly in practice. In general, the PSF is estimated simultaneously from the observed spectrum, but it becomes difficult when the spectroscopic data are polluted by strong noise. In this paper, we present a deconvolution method used to improve the resolution of THz spectrum. In the method, the energy function is constructed, which includes the likelihood term, Total variation of spectrum term and L2 norm of the PSF term. The PSF is modeled as a parametric function combination with the a priori knowledge about the characteristics of the instrumental response. The spectrum and the parameter of PSF are obtained by minimizing the energy functional using alternate minimization approach. Experimental results are shown to demonstrate the efficiency of the proposed method used for THz spectrum.

关键词： THz spectrum Total variation deconvolution alternate minimization approach

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