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IEEE Energy Conversion Congress and Exposition

作者： Sizhao Lu Zhengming Zhao Liqiang Yuan Ting Lu Yang Jiao Mingkai Mu Fred C. Lee State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Tech Blacksburg VA 24061 USA

ISBN: (纸本)9781479957774

This paper presents a modularized high frequency high power 3-level neutral point clamped power electronics building block (PEBB) for renewable energy system. Three-level diode neutral point clamped (NPC) and 3-level active NPC are most popular topologies used in industrial applications based on modularized building block. However, since the single 3-level diode NPC or active NPC cell is unable to form a 3-level DC-DC chopper, the applications of PEBB cells based on these two circuits are limited where a DC-DC chopper is needed. In this paper, loss analysis for the 3-level chopper built by two 3-level diode NPC cells or active NPC cells are conducted. Switching loops in PEBB cells are identified, and double pulse tests are conducted for turn on and turn off transient of the switching loops. Based on double pulse tests, the switching losses will be quantified for different switching loops. Two 3-level bi-directional chopper circuits based on the active NPC PEBB cells are presented and compared. Then the modified PEBB cell derived from single active NPC cell is proposed for 3-level bi-directional chopper. Based on a common active NPC PEBB cell, the power converter can be built with modularized structure to achieve high frequency, high efficiency and low cost.

关键词： Switches Choppers (circuits) Switching loss Topology Renewable energy sources Power electronics

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Distribution of populations in excited states of electrodeless discharge lamp of Rb atoms

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Chinese Science Bulletin 2013年第16期58卷 1876-1881页

作者： TAO ZhiMing WANG YanFei HONG YeLong WANG DongYing ZHANG ShengNan ZHUANG Wei CHEN JingBiao State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering & Computer Science Peking University Department of Physics Bijie University

The intensity of fluorescence spectral lines of Rb atoms in the region of 350-1110nm is measured in eletrodeless discharge lamp. The population ratio between the excited states is calculated according to the spontaneous transition probabilities with rate equations. At the same time, the population density of energy level is also obtained. The results provide the potential applications of electrodeless discharge lamp in atomic filter and optical frequency reference at higher excited states without a pumping laser.

关键词：原子激发态无极灯铷原子种群分布人口密度无极放电灯原子滤光器概率计算

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The computer Assisted Surgical Trainer: Design, Models, and Implementation 14

The Computer Assisted Surgical Trainer: Design, Models, and ...

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Simulation Multiconference

作者： J. W. Rozenblit C. Feng M. Riojas L. Napalkova A. J. Hamilton M. Hong P. Berthet-Rayne P. Czapiewski G. Hwang J. Nikodem A. Shankaran A. Rao The University of Arizona Department of Electrical and Computer Engineering Autonomous University of Barcelona Department of Telecommunication and System Engineering Department of Surgery Arizona Simulation Technology and Education Center Manufacturing Systems Solutions LLC Faculty of Electronics Wroclaw University of Technology

ISBN: (纸本)9781632667335

This paper describes a system developed to assist in model-based training of minimally invasive, laparoscopic procedures. The key factor motivating the development of the device called CAST (computer-Assisted Surgical Trainer) is the need to improve the state-of-the-art in teaching laparoscopy, and ultimately achieve better surgical outcomes. CAST's design concept and architecture is presented with its major elements that facilitate guided (both haptic and visual) execution of tasks, performance assessment, and comparative analysis of results. Both software and hardware models and implementations are given. The system, while currently intended for off-line, laboratory use, has an excellent potential for real-time assistive functions in the operating room.

关键词： Surgical Training Laparoscopy Augmented Reality computer-Guided Navigation Cognitive Models surgical training augmented reality Laparoscopy Cognitive Maps computers Trainers computer-assisted Design models design concept major elements Castings Surgery Operating rooms

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An Adaptive Predictive Control Strategy for RMPPT under Partially Shaded Conditions

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IFAC Proceedings Volumes 2014年第3期47卷 4947-4952页

作者： Chao Ma Jing Wu Ning Li Shaoyuan Li Kang Li Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK

As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. However, these methods may fail when shading conditions occur and the power loss can over as much as 70% due to the multiple maxima in I – P curve in shading conditions v.s. single maximum point in uniformly solar irradiance. In this paper, a Real Maximum Power Point Tracking (RMPPT) strategy under Partially Shaded Conditions (PSCs) is introduced to deal with this kind of problems. An optimization problem, based on a predictive model which will change adaptively with environment, is developed to tracking the global maxima and corresponding adaptive control strategy is presented. No additional circuits are required to obtain the environment uncertainties. Finally, simulations show the effectiveness of proposed method.

关键词： Photovoltaic systems RMPPT Partial shading Adaptive predictive control

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An integrated enhanced-locking-range injection-locked frequency divider with internal VCO

An integrated enhanced-locking-range injection-locked freque...

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Asia-Pacific Conference on Microwave

作者： Sanghun Lee Sunhwan Jang Cam Nguyen System LSI Division Samsung Electronics Co. Ltd. Yong-In City South Korea Department of Electrical and Computer Engineering Texas A&M University College Station TX USA

A 10.5-GHz divide-by-3 (1/3) injection-locked frequency divider (ILFD) with an internal Voltage Controlled Oscillator (VCO) that can provide extra locking range is presented. A phase tuner implemented on an asymmetric inductor is proposed to increase the locking range through even-harmonic phase tuning in addition to those achieved by other techniques. With a fixed internal injection signal power of only − 18 dBm, a 25% enhancement in the locking range from 12 to 15 MHz is achieved with the proposed phase tuning. The integrated 1/3 ILFD has a frequency tuning range of 3.3 – 4.2 GHz. It is realized in a 0.18-µm BiCMOS process, occupies 0.6 mm × 0.7 mm, and consumes 10.6 mA while the ILFD alone consumes 6.15 mA from 1.8-V supply.

关键词： Decision support systems Harmonic analysis Abstracts Tuning Solid state circuits Radiofrequency integrated circuits

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Distributed MPC for Tracking based on Reference Trajectories

Distributed MPC for Tracking based on Reference Trajectories

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第三十三届中国控制会议

作者： Langwen Zhang Jingcheng Wang Zhengfeng Liu Kang Li Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast

ISBN: (纸本)9781479947249

In this paper, we consider the control of large-scale processes with both input and state couplings. A distributed model predictive control(MPC) strategy for tracking based on the reference trajectories is presented. The proposed distributed MPC strategy requires decomposing a large-scale system into several smaller ones and solving convex optimization problems independently. Distributed MPC tracking strategies for unconstrained and constrained processes are presented, respectively. An iterative algorithm is presented to coordinate the distributed MPC controllers. The proposed algorithm is applied to a four-tank process to demonstrate the effectiveness.

关键词： distributed MPC tracking iterative algorithm reference trajectories

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On stability analysis and synthesis of reset control systems with output uncertainties

On stability analysis and synthesis of reset control systems...

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第三十三届中国控制会议

作者： Guanglei Zhao Jingcheng Wang Kang Li Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China School of Electronics Electrical Engineering and Computer ScienceQueens University BelfastUK

ISBN: (纸本)9781479947249

This paper considers reset control systems with output *** present sufficient conditions for the quadratic stability and finite L2 gain ***,the results are extended to piecewise quadratic stability which is much less ***,an iterative algorithm is proposed to design the reset *** the obtained results are given as linear matrix inequalities(LMIs) that can be solved *** examples are given to illustrate the results.

关键词： reset control output uncertainties quadratic stability iterative algorithm

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Smart homes in Poland: Challenges and opportunities

Smart homes in Poland: Challenges and opportunities

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Innovative Smart Grid Technologies (ISGT)

作者： A. Sajadi W. Maślak B. Zielinski K. A. Loparo Electrical Engineering and Computer Science Department Case Western Reserve University Cleveland OH USA Institute of Electronics Systems Warsaw University of Technology Warsaw Poland Innovation with Department of PSE SA Polish System Operator Konstancin-Jeziorna Poland

Poland, the 34th most populous country in the world and 6th among members of the European Union, generated 142.9 TWh net electricity, of which households consumed more than 30% in 2010. This work provides an insight into the potential of smart buildings in Poland. The essential contribution of this work is the consideration of the experiences of the national electrical system operator, existing building technologies, feasible solutions, and opportunities for smart homes in Poland.

关键词： Smart homes Educational institutions Energy consumption Electricity Europe Generators

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On Infinite Time Performance of Nonlinear Model Predictive Controllers

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IFAC Proceedings Volumes 2014年第3期47卷 1916-1921页

作者： Xin Cai Shaoyuan Li Ning Li Kang Li Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education Shanghai 200240 P. R. China School of Electronics Electrical Engineering and Computer Science The Queen's University Belfast Belfast BT7 1NN UK

This paper addresses the problem of infinite time performance of model predictive controllers applied to constrained nonlinear systems. The total performance is compared with a finite horizon optimal cost to reveal performance limits of closed-loop model predictive control systems. Based on the Principle of Optimality, an upper and a lower bound of the ratio between the total performance and the finite horizon optimal cost are obtained explicitly expressed by the optimization horizon. The results also illustrate, from viewpoint of performance, how model predictive controllers approaches to infinite optimal controllers as the optimization horizon increases.

关键词： Model Predictive Control Finite Horizon Optimal Control Value Iteration Principle of Optimality

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S6-G4: High injection and efficiency droop in GaInN light-emitting diodes

S6-G4: High injection and efficiency droop in GaInN light-em...

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IEEE Conference on High Performance Devices

作者： Guan-Bo Lin David S. Meyaard E. Fred Schubert Jaehee Cho Jong Kyu Kim Hyunwook Shim Min-Ho Kim Cheolsoo Sone Department of Electrical Computer System Engineering Rensselaer Polytechnic Institute Troy New York United States of America Department of Materials Science and Engineering Pohang University of Science and Technology Pohang Gyeongbuk Republic of Korea Semiconductor Physics Research Center Conbuk National University Jeonju Jeollabuk Republic of Korea LED Business Samsung Electronics Suwon Gyeonggi Republic of Korea

An evident correlation between the high injection and the efficiency droop is demonstrated in GaInN light-emitting diodes (LEDs) for temperature ranging from 80K to 450K. For this temperature range, the efficiency droop has the same thermal tendency with the high injection, i.e. the onset shifts to lower voltage and higher current with increasing temperature. The voltage difference between two onsets mainly falls on the resistive p-type region and induces strong electric field to enable electron drift leakage and the resulting efficiency droop.

关键词： Light emitting diodes Temperature distribution Electric fields Radiative recombination Temperature measurement Charge carrier processes

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