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2012 Conference on Precision electromagnetic Measurements, CPEM 2012

作者： Ren, Shiyan Cai, Donghui Zhang, Yumeng State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electric Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781467304399

A 60,000-A dc comparator based on dual-loop control system with self-calibration and mutual-calibration is developed. The dual-loop control principle, which is that the bias winding's current automatically balances more than 90% of the dc magnetic potential of the measured current and the feedback winding's current automatically compensates the rest of the dc magnetic potential, is applied in this comparator. The quadruple electricity and magnetic shielding structure is used to get a high precision, which can reach 5×10-6 accuracy. It has been verified by experiments. Finally, the advantages and bright application prospects are shown in detail. © 2012 IEEE.

关键词： Control systems

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Terahertz radiation sources based on free electron lasers and their applications

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Science China(Information Sciences) 2012年第1期55卷 1-15页

作者： TAN Ping1,HUANG Jiang2,LIU KaiFeng2,XIONG YongQian2&FAN MingWu1,2 1Department of Electronic and Information engineering,Huazhong University of Science and technology,Wuhan 430074,China 2College of Electrical and Electronic engineering,State Key laboratory of advanced electromagnetic engineering and technology,Huazhong University of Science and technology,Wuhan 430074,China 1. Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China2. College of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

The tunability,high power and flexible picoseconds-pulse time structure of terahertz(THz)radiation make the THz free-electron laser(FEL)a very attractive THz source of coherent *** paper focuses on the development and perspectives of THz radiation sources based on the *** principles of the low gain THz FEL oscillator,the SASE THz FEL amplifier and the supperradiant THz FEL are reviewed briefly,and the key technologies of THz FEL,such as injector,accelerator,undulator and optical cavity,are discussed,*** current status of and future prospects for THz radiation sources based on the FEL are emphasized in this *** research and development have shown bright future in free-electron laser(FEL)THz radiation *** potential applications can be carried out in the field of imaging,material research,biology medicine,communication,diagnostics and many others.

关键词： terahertz source terahertz applications free electron laser

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A self-calibration method for high-precision direct current comparator

A self-calibration method for high-precision direct current ...

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2012 Conference on Precision electromagnetic Measurements, CPEM 2012

ISBN: (纸本)9781467304399

To solve the problem of calibrating high-precision heavy direct current comparator and related metering device, a self-calibration method based on small current differential principle is proposed, and the formulas based on the method are derived. This method fairly prevents the difficulty from measuring weak signal, and can accurately and easily calibrate 1×10 -5∼1×10-7 current ratio-error for high-precision direct current instruments by choosing appropriate measurement parameters based on the formula in this paper. And the validity of the method is proved by experimental data. © 2012 IEEE.

关键词： Comparators (optical)

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Communication channel reconstruction technology of wide-area protection under extreme catastrophe

Communication channel reconstruction technology of wide-area...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： Li, Zhenxing Yin, Xianggen Zhang, Zhe He, Zhiqin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electric Power Security and High Efficiency Laboratory Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781447124665

A new scheme of communication channel reconstruction technology (CCRT) for wide-area protection (WAP) under extreme catastrophe scenarios is proposed for the purpose of safeguarding the safety and reliability of relay protection. The communication hierarchy of WAP based on MPLS VPN is obtained according to the characteristic of communication system. Under the damage of optical communication channel, CCRT based on circuitous way is first realized by sturdy optical fiber, carrier, microwave and telecommunication channels and so on, and then CCRT based on wireless sensor network (WSN) is built when the circuitous path cannot reconstruct communication channel for more channels damaged. The key technology of WSN, such as the supply energy pattern, router algorithm and multi-hops way, are also discussed. The test results of multiple schemes show that CCRT based on WSN can be suitable for WAP. © 2012 Springer-Verlag London Limited.

关键词： Wireless sensor networks

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Three-stage Solid State Transformer modeling through real time digital simulation with Controller Hardware-in-the-loop

Three-stage Solid State Transformer modeling through real ti...

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2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012

作者： Mo, Ran Mao, Chengxiong Lu, Jiming Li, Hui Liu, Xiaohu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Center for Advanced Power Systems Florida State University Tallahassee United States

ISBN: (纸本)9781457720864

The Solid State Transformer (SST) is one of the key elements in Smart Grid. Building as many hardware and multiplying SST devices is expensive and time consuming in addition to a needed lab space and safety measures. This paper constructs the three-stage SST switching model through real time digital simulator (RTDS) with Controller Hardware-in-the-loop. The models of SST rectifier and inverter stage are built on the RTDS using small time-step simulation. The controller hardware-in-the-loop technology is adopted for DC/DC converter stage modeling. The developed model is verified by comparing with the simulation results in MATLAB/PLECS. The simulation results show that, RTDS can not only accurately implement and validate the SST switching model, but also provide more detailed information about state variables in real time. © 2012 IEEE.

关键词： MATLAB

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Guest editorial special issue on atmospheric pressure plasma jets and their applications

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IEEE Transactions on Plasma Science 2012年第11 PART1期40卷 2786-2787页

作者： Shladover, Xinpei Karakas, Erdinc State Key Laboratory of Advanced Electromagnetic Science and Technology Lab HuaZhong University of Science and Technology Wuhan 430074 China Plasma Processing Lab Chemical and Biomolecular Engineering Department University of Houston Houston TX 77204 United States

The 25 papers in this special issue focus on atmospheric pressure jets and their applications.

关键词： Special issues and sections Plasma applications

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Wide-area backup protection algorithm based on multisource information fusion

Wide-area backup protection algorithm based on multisource i...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： He, Zhiqin Zhang, Zhe Yin, Xianggen Li, Zhenxing Deng, Xing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781447124665

Wide-area backup protection is a novel technique presented in recent years, which uses multisource information to make fault identification decision and availably prevents catastrophic blackouts. However, the property of algorithm will be deteriorated when information error exists. For the sake of improving the property of wide-area backup protection, this paper proposes an information fusion strategy using genetic algorithm to optimize the decision-making function. The operation information from local directional pilot relay and impedance relay is applied to establish the fitness function. Simulation tests based on IEEE 3-generator and 9-bus system validates the presented algorithm under as many as 3 bits information error. © 2012 Springer-Verlag London Limited.

关键词： Genetic algorithms

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Analysis of the UHV tie line active power peak value of weak interconnected grids following power shortage disturbance in China power system

Analysis of the UHV tie line active power peak value of weak...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： Hong, Feng Chen, Jinfu Duan, Xianzhong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781447124665

An ultra high voltage (UHV) AC tie line that connects North China and Central China power grid has been put into operation in 2009. This paper presents a method to calculate the peak value of active power oscillation of the UHV AC tie line following power shortage disturbance. The typical process of the oscillation on the UHV AC line is analyzed. It is shown that the active power oscillation on tie line of week connection grid is similar with the step response of the second-order system. The oscillation peak value is closely related to fault location, system inertia, and system inter-area damping. The method and analysis are tested in China system. © 2012 Springer-Verlag London Limited.

关键词： Electric power transmission networks

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Study on unbalance factor of sequence impedance for parallel multi-circuit cable lines

Study on unbalance factor of sequence impedance for parallel...

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2011 International Conference on Electrical, Information engineering and Mechatronics, EIEM 2011

作者： Deng, Xing Yin, Xianggen Zhang, Zhe He, Zhiqin Li, Zhenxing State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab. Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781447124665

Parallel multi-circuit cable lines are wildly used to improve the transmission capacity of urban power grid, but the study on sequence impedance parameters' asymmetry of multi-circuit cable lines is not available. To analyze the asymmetry of multi-circuit cable lines' parameters, a method to measure the unbalance factor is introduced in this paper. Furthermore, take engineering practice as an example, the electromagnetic unbalance factor of two-circuit cable lines under different arrangements are calculated by this method. Finally, a comparison among these unbalance factor is made. The comparative results show that the triangle arrangement has better symmetry than straight-vertical and straight-horizontal arrangement, in which the triangle-vertical arrangement's symmetry is the best. © 2012 Springer-Verlag London Limited.

关键词： Timing circuits

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An investigation on the active-power variations of wind farms

An investigation on the active-power variations of wind farm...

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作者： Lin, Weixing Wen, Jinyu Cheng, Shijie Lee, Wei-Jen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China University of Texas at Arlington Arlington TX 76019 United States

Variation is one of the most important inherent characteristics of wind power. Very few common methods exist to quantify the variations. This presents difficulty for the security and efficiency operations of power systems if large-scale wind power is included. Based on the analysis results from the large amounts of field measurements from nine aggregated wind farms, it is found that the $t$ location-scale distribution and the Laplace distribution are able to cope with this problem. A systemic methodology is proposed accordingly. Therefore, the characteristic of the wind-power variations could be appropriately represented. © 2012 IEEE.

关键词： Electric utilities

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