检索结果-内蒙古大学图书馆

IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： K. L. S. Shenxing X. Dong Z. Bo State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Tsinghua University Beijing Beijing CN State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Stafford UK

Non conventional instrument transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using phase-locked loops (PLL ) technology.

关键词： Substations Delay effects Ethernet networks Phase locked loops IEC Synchronization Data communication

来源：评论

学校读者我要写书评

暂无评论

Robust control of a High Precision 4-DOF Parallel Manipulator

引用

IFAC Proceedings Volumes 2008年第2期41卷 15708-15713页

作者： Jacob W.F. Cheung Y.S. Hung Motion Control and Systems Laboratory Research and Development Department ASM Assembly Automation Ltd. 3/F Watson Centre 16 Kung Yip Street Kwai Chung New Territories Hong Kong Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong

A model-based robust control design approach is considered for a novel direct-drive 4-DOF parallel manipulator aimed at high speed and high precision semiconductor packaging applications. An experimental identification method is proposed to determine the dynamic model of the manipulator and a robust feedback controller is designed in the frequency-domain using genetic algorithm. Experimental results demonstrate that the motion performance of the 4-DOF parallel manipulator including positioning accuracy and steady-state error is improved significantly when compared with traditional XY, Z and θ motion stages. This shows that the proposed 4-DOF parallel manipulator provides a superior alternative to the traditional motion stages for high-precision motion.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The study of software and hardware platform for the node of WSN

The study of software and hardware platform for the node of ...

引用

IEEE International Conference on automation and Logistics

作者： Xijun Chen Max Q.-H. Meng Huawei Liang Fuqing Wu Zhuancheng Zhang Department of Automation University of Science and Technology Hefei Anhui China Center for Biomimetic Sensing and Control Research Institute of Intelligent Machines Chinese Academy and Sciences Hefei Anhui China Department of Electronic Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781424425020

Wireless sensor network(WSN) is a new method of information acquisition and processing, and has great influence on more and more ***, this paper presents a test-bed for WSN node and its appropriate characteristics for WSN node. And then, it specifies the analysis of the necessity of porting software to the exiting hardware platform and solutions to many problems during porting ***, the experimental result is described in details, which well proves the feasibility of porting SOS to the chip CC2431.

关键词： Hardware Wireless sensor networks Operating systems Wireless communication Software Engines Kernel

来源：评论

学校读者我要写书评

暂无评论

Packet-loss dependent controller design for networked control systems via switched system approach

Packet-loss dependent controller design for networked contro...

引用

IEEE Conference on Decision and control

作者： Junyan Yu Long Wang Mei Yu Yingmin Jia Jie Chen Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing China Department of Automation North China Electric Power University Zhuxinzhuang Beijing China The Seventh Research Division Beihang University Beijing China Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China

ISBN: (纸本)9781424431236

The stabilization problem of networked control systems with bounded packet loss is addressed. We model such networked control systems as a class of switched systems, and present sufficient conditions for the stabilization by using a packet-loss dependent Lyapunov function. Moreover, different from existing results, we propose the design for packet-loss dependent stabilizing controllers for two types of packet-loss processes: one is a arbitrary packet-loss process, and the other is a Markovian packet-loss process. Several numerical examples and simulations are worked out to demonstrate the effectiveness of the proposed design technique.

关键词： control systems Networked control systems Switched systems Sufficient conditions Optimal control Delay effects Communication system control Communication system traffic control Feedback control Electrical equipment industry

来源：评论

学校读者我要写书评

暂无评论

Multi-target controller of three-level NPC based VSC-HVDC transmission system and Its RTDS simulation

Multi-target controller of three-level NPC based VSC-HVDC tr...

引用

IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Jianhua Zhang Sheng Li Jingfu Shang Weiwei Zhao Chunye Li Department of Electrical Engineering the School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Beijing China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine wave PWM (ISPWM) technique is designed to raise the DC voltage utility rate. Real time digital simulation (RTDS) is done to verify the validity of the proposed control strategy and controllers and demonstrate the good performance of VSC-HVDC.

关键词： Converters Power conversion control systems Pulse width modulation Mathematics Mathematical model Power system modeling Diodes Reactive power control HVDC transmission

来源：评论

学校读者我要写书评

暂无评论

control of Formations of UAVs for Surveillance and Reconnaissance Missions

引用

IFAC Proceedings Volumes 2008年第2期41卷 5161-5166页

作者： T. Kopfstedt M. Mukai M. Fujita C. Ament Research and Development Diehl BGT Defence GmbH und Co. KG 88662 Ueberlingen Germany (Tel: +49-7551-892875 Department of Electrical and Electronic Systems Engineering Kyushu University Fukuoka 819-0395 Japan Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan System Analysis Group Technical University of Ilmenau 98693 Ilmenau Germany

This paper presents a method for control of formations of Unmanned Aerial Vehicles (UAVs) in urban environments with several obstacles. Therefore the trajectories for each UAV are planned using mixed integer quadratic programming (MIQP) to describe a minimization problem. The result of this minimization problem then characterizes a collision free trajectory for each UAV using the commanded formations to fulfil the missions. The description of the UAVs, the inter UAV collision avoidance, the collision avoidance with obstacles as well as the description of formations will be shown in detail together with some simulation results in this paper. In addition the introduction explains the fields of interest in such formations of UAVs and what kind of advantage they can bring in comparison to today's solutions. The novelty in the approach in this paper is the description of formations of UAVs used in combination with MIQP to change formations, to add additional UAVs into an existing formation and to split formations, simply by changing some parameters in the description of the formation.

关键词： Autonomous systems Description of Formation Flights Hybrid systems Optimal control Mixed Integer Quadratic Programming

来源：评论

学校读者我要写书评

暂无评论

Space Time Adaptive Processing for Comb Waveforms

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

引用

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and engineering) 2008年第5期32卷 937-940页

作者： Zhao, Shendong Tang, Jinsong Cai, Zhiming Department of Electronic Engineering Naval University of Engineering Wuhan 430033 China Department of Aviation Armament Fire Control System Naval Aeronautical Engineering Academy of Qingdao Branch Qingdao 266041 China

The characteristics of the spatial time distribution of comb waveforms reverberation is analyzed, and it is pointed out that the signals of this type have the possibility of carrying out reduced-rank space time adaptive processing. According to the distribution characteristics, a reduced-rank algorithm that is suitable for the signals of multiple frequency is given based on the space-time multiple-beam processing approach. The algorithm carries out joint space time processing by selecting some auxiliary beams in all the frequencies. Target is searched for in the angle-speed plane. The results of simulation show that the algorithm can both reduce the rank and suppress the strong reverberation of moving sonar, and it can achieve better detection performance than conventional approaches.

关键词： Comb waveforms Reverberation STAP STMB

来源：评论

学校读者我要写书评

暂无评论

A Study on Random Autonomous Algorithm for Service Survivability Scheduling

A Study on Random Autonomous Algorithm for Service Survivabi...

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Lei Zhang Arun Sood Hao Dai Mingkai Ma Institute of Command Automation PLA University of Science and Technology Nanjing China Department of Computer Science and Center for Image Analysis George Mason University Fairfax VA USA Institute of Command Automation People''s Liberation Army University of Science and Technology Nanjing China Institute of China Electronic Equipment System Engineering Company Beijing China

We present in this paper a scheduling algorithm towards the service migration uncertainty that aims to enhance the service survivability in the server cluster system. Survivable scheduling algorithm is one of the important aspects of survivability study. This paper introduced the stochastic mechanism in the server cluster systems, which made it uncertain of the services migration among the servers, so as to increase the difficulty for the intruders penetrating the systems, and enhanced the system survivability. In this work, we introduced the layers of survivability study, illustrated the function of the survivable scheduling algorithm; then, analyzed the advantages and disadvantages of the exist scheduling algorithms; promoted a pseudo-random autonomous algorithm for service survivability scheduling, including generating the scheduling sequence and the Markov-based autonomous competition mechanism, the performance of the algorithm is investigated at last.

关键词： Scheduling algorithm Clustering algorithms Centralized control TCPIP electronic equipment systems engineering and theory Algorithm design and analysis Network servers Redundancy Computer networks

来源：评论

学校读者我要写书评

暂无评论

Annual business and news:: Beginning the 31st year of the Journal of Guidance, control, and Dynamics

引用

JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

来源：评论

学校读者我要写书评

暂无评论

Photovoltaic/Thermal system for Stand-Alone Operation

Photovoltaic/Thermal System for Stand-Alone Operation

引用

39th IEEE Power electronics Specialists Conference (PESC 2008), vol.9

作者： Rafael K. Jardan Istvan Nagy Angel Cid-Pastor Ramon Leyva Abdelali El Aroudi Luis Martinez-Salamero Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Department of Electrical Electronic and Automatic Control Engineering University Rovira i Virgili Tarragona Spain

The growing demand for the utilization of clean energy resources requires consideration of more efficient and economical ways in the usage of available resources and technologies. In the field of solar energy both the efficiency and the economics, i.e. the payback times are crucial questions for a more widespread application of this resource in the future. A novel solution and system are proposed in the paper aimed at enhancing the amount of energy that can be harvested from solar radiation in the same area. The basis of the method presented is a special construction of combined Photovoltaic/Thermal panels that can generate heat power to produce hot water, while the photovoltaic part provides electric power for covering the electric power consumption of loads, to supply its own electronic control units and to operate pump drives etc. The theoretical predictions of the electric part of the system are confirmed by laboratory test results. The system and the overall control structure, including the MPPT control, are presented assuming stand-alone operation but parallel operation is also possible.

关键词： Temperature measurement Resistance heating Construction industry Batteries Converters Capacitors Heat transfer

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：