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2012 Conference on Precision electromagnetic Measurements, CPEM 2012

作者： Ren, Shiyan Zhang, Yumeng Cai, Donghui 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

To solve the problem of calibrating current summation measurement system, a novel high-precision current adder based on current comparator principle is presented. It contains primary windings of six channels, feedback winding and calibrating winding. The total 24 windings' turns of such six channels can be selected skillfully according to the method of minimum common divisor, so that the sum of measured currents is indicated by the adder's feedback current. And experiments show that its accuracy is better than 5×10-5. © 2012 IEEE.

关键词： Comparators (optical)

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A 60,000-A DC comparator based on dual-loop control system

A 60,000-A DC comparator based on dual-loop control system

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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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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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Innenrücktitelbild: Electrical Network of Single‐Crystalline Metal Oxide Nanoclusters Wired by π‐Molecules (Angew. Chem. 42/2014)

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Angewandte Chemie 2014年第42期126卷

作者： Ryo Tsunashima Yoshifumi Iwamoto Yusuke Baba Chisato Kato Katsuya Ichihashi Sadafumi Nishihara Katsuya Inoue Katsuya Ishiguro Yu‐Fei Song Tomoyuki Akutagawa Graduate School of Science and Engineering Yamaguchi University Yoshida 1677‐1 Yamaguchi 753 8512 (Japan) Department of Biology and Chemistry Yamaguchi University Yoshida 1677‐1 Yamaguchi 753 8512 (Japan) Graduate School of Science Hiroshima University 1‐3‐1 Kagamiyama Higashi‐Hiroshima 739‐8526 (Japan) Institute for Advanced Materials Research Hiroshima University Higashi‐Hiroshima 739‐8530 (Japan) State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology 100029 Beijing (P. R. China) Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Tohoku University Sendai 980‐8577 (Japan)

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Electrical Network of Single‐Crystalline Metal Oxide Nanoclusters Wired by π‐Molecules†

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Angewandte Chemie 2014年第42期126卷

In a mixed‐valence polyoxometalate, electrons are usually delocalized within the cluster anion because of low level of inter‐cluster interaction. Herein, we report the structure and electrical properties of a single crystal in which mixed‐valence polyoxometalates were electrically wired by cationic π‐molecules of tetrathiafulvalene substituted with pyridinium. Electron‐transport characteristics are suggested to represent electron hopping through strong interactions between cluster and cationic π‐molecules.

关键词： Leitfähige Materialien Molekulare Elektronik Nanopartikel Polyoxometallate

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Inside Back Cover: Electrical Network of Single-Crystalline Metal Oxide Nanoclusters Wired by π-Molecules (Angew. Chem. Int. Ed. 42/2014)

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Angewandte Chemie International Edition 2014年第42期53卷

作者： Dr. Ryo Tsunashima Yoshifumi Iwamoto Yusuke Baba Chisato Kato Katsuya Ichihashi Dr. Sadafumi Nishihara Prof. Katsuya Inoue Prof. Katsuya Ishiguro Prof. Yu-Fei Song Prof. Tomoyuki Akutagawa Graduate School of Science and Engineering Yamaguchi University Yoshida 1677-1 Yamaguchi 753 8512 (Japan) Department of Biology and Chemistry Yamaguchi University Yoshida 1677-1 Yamaguchi 753 8512 (Japan) Graduate School of Science Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima 739-8526 (Japan) Institute for Advanced Materials Research Hiroshima University Higashi-Hiroshima 739-8530 (Japan) State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology 100029 Beijing (P. R. China) Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Tohoku University Sendai 980-8577 (Japan)

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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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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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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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