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CIRED 2021 - The 26th International Conference and Exhibition on Electricity Distribution

作者： Z. Wang Z. Liu M. Kraiczy N. Bornhorst S. Wende-von Berg M. Braun Department of Energy Management and Power System Operation University of Kassel 34121 Kassel Germany Grid Planning and Grid Operation Division Fraunhofer IEE 34119 Kassel Germany

The increasing penetration from intermittent renewable distributed energy resources in distribution grid brings along challenges in grid operation and planning. To evaluate the impact on the grid voltage profile, grid losses, and discrete actions from assets (e.g. transformer tap changes), quasi-static simulation is an appropriate method. Quasi-static time series and Monte-Carlo simulation requires a tremendous number of power flow calculations (PFCs), which can be significantly accelerated with a parallel high-performance computing (HPC)-PFC solver. In this paper, we propose a HPC-PFC-solver-based grid simulation (parallel simulation) approach for a multi-core CPU platform as well as a greedy method, which can prevent the errors caused by simultaneous parallel simulation. The performance of the proposed approach and the comparison is demonstrated with two use cases.

关键词： load flow time series distributed power generation on load tap changers power distribution control grid computing Monte Carlo methods power grids

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A CFO Matrix Method for Interleaved Uplink OFDMA Systems

A CFO Matrix Method for Interleaved Uplink OFDMA Systems

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2010 International colloquium on computing,Communication, control, and Management (CCCM2010)

作者： Ruiyan Du Jinkuan Wang Fengming Xin School of Information Science and Engineerin Northeastern University Shenyang,China Liqun Shan Daqing Petroleum Institute Daqing,China

In this paper,a CFO matrix method is presented for carrier frequency offset(CFO) estimation in interleaved uplink orthogonal frequency division multiplexing access(OFDMA) *** proposed method utilizes the information of eigenvalues and eigenvectors of the defined CFO matrix to estimate the CFOs of all involved *** with the previous works,the main advantages of the proposed approach are that it can obtain the CFOs of all users simultaneously within only one OFDMA block without pilot symbols,provides better performance such as smaller estimation error and superior noise-resistant capability,and has a much lower computational complexity as *** results verify the high accuracy and effectiveness of the proposed method

关键词： Carrier frequency offset(CFO) orthogonal frequency division multiplexing access(OFDMA) parameter estimation.

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performance optimization with efficient polling mechanism in ieeE 802.16 networks with cross-layer consideration

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Wireless Personal Communications 2009年第3期51卷 635-665页

作者： Yin, Fei Pujolle, Guy Park, Jong Hyuk Chao, Han-Chieh LIP6 University Paris 6 104 Avenue du Président Kennedy Paris 75016 France L2TI Institut Galilée University Paris 13 99 Avenue J-B Clément Villetaneuse 93430 France Department of Computer Science and Engineering Kyungnam University 449 Wolyoung-dong Masan Kyungnam 631-701 Korea Republic of College of Electrical Engineering and Computer Science National Ilan University I-Lan Taiwan

ieeE 802.16 standard suite defines a reservation-based bandwidth allocation mechanism. A SS (Subscriber Station) has to be polled to request bandwidth reservation before transmits uplink data to a BS (Base Station). In this mechanism exist two main polling modes: the unicast polling mode and the contention-based polling mode. The different polling operations in MAC (Medium Access control) result in different PHY (PHYsical layer) frame structure that deeply affect the performance. Therefore, there should be an optimal scheme to adopt these two polling modes in order to optimize the performance. Although the standard defines five service classes to adaptively use the polling modes to fit the QoS (Quality of Service) requirements of different applications, it does not specify exactly a scheme to adopt these two polling modes efficiently and fairly during the polling process. In~this paper, we investigate the polling mechanisms in ieeE 802.16 networks, and focus the attention on the performance caused by different adoption schemes. We also propose a simple but efficient polling mechanism to optimize the performance. The simulation results verify that the performance is conditioned to the fulfillment of the polling mechanisms and our proposed optimal polling scheme can allocate bandwidth more efficient and achieve better performance. © 2009 Springer Science+Business Media, LLC.

关键词： Medium access control

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SIGNAL INTEGRITY SIMULATION AND ANALYSIS IN high-SPEED INTERCONNECTS BY USING FDTD 3

SIGNAL INTEGRITY SIMULATION AND ANALYSIS IN HIGH-SPEED INTER...

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2002 3rd International Symposium on Electromagnetic Compatibility

作者： Li Er-Ping Yuan Wei-Liang Computational Electromagnetics and Electronics Division Institute of High Performance Computing 1 Science Park Road

ISBN: (纸本)0780372778

With the advancements in microelectronics, interests in electromagnetic interference and compatibility in high-speed circuits have greatly increased in engineering community,and applications of computational electromagnetics to electromagnetic interference and compatibility(EMI/EMC) engineering become an emerging ***,via,and crosstalk on interconneciion lines will raise EMI problems in high-speed circuits and shall pay more attentions during design phases for signal *** paper presents signal propagation effect analysis on high-speed interconnection lines between different parts with the finite-difference time-domain *** mechanism and the effectiveness of control measures are examined, which could be applied to the high-speed circuit designs.

关键词： SIGNAL INTEGRITY SIMULATION AND ANALYSIS IN high-SPEED INTERCONNECTS BY USING FDTD

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iee computing and control division colloquium on high performance computing for advanced control

IEE Computing and Control Division Colloquium on High Perfor...

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iee computing and control division colloquium on high performance computing for advanced control

The proceedings contains 8 papers. Topics discussed include parallel computer systems, manipulators, real time systems, genetic algorithms, software engineering, fault tolerant systems, large scale systems, systems an... 详细信息

关键词： Computer systems

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Hardware compilation technology for embedded image processing

Hardware compilation technology for embedded image processin...

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iee colloquium on high performance Architectures for Real-Time Image Processing

作者： T.M. Sheen A.R. Allen A.E. Lawrence I. Page Department of Engineering University of Aberdeen UK The Computing Laboratory University of Oxford UK

There are an increasing number of applications of automated image analysis in which imaging is part of an instrumentation or process control system. A variety of industrial processes, including quality control and assembly, robotic, security and other applications make use of machine vision. Such embedded applications often require performance to be tuned in various ways to satisfy time constraints, which may vary through the lifetime of the application. There may, in addition, be a requirement to produce versions of an imaging product targetted at different classes of user, to satisfy various market niches, for example. It is therefore important to develop software tools which allow developers to relatively easily target a variety of computational engines. Possible target systems may include PC, dedicated microprocessor or digital signal processor, multiprocessors, or custom hardware. We report our experience in applying hardware compilation technology in an FPGA-based system to some typical image processing tasks.

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Application of commercial off-the-shelf technologies to aerospace gas turbine engine control

Application of commercial off-the-shelf technologies to aero...

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Proceedings of the 1997 iee colloquium on computing and control division

作者： Thompson, H.A. Sheffield Univ Sheffield United Kingdom

The need for providing gas turbine engine control with more sophisticated controls that reduce cost is discussed. Interest is given in the exploitation of Commercial-Off-The-Shelf (COTS) technologies reduces size, cost and weight will provide for this need of controlling gas turbine engines. A number of key COTS technologies are identified: increased miniaturization using multichip modules (MCM);use of COTS databases from automotive applications;use of non-MIL SPEC components and high temperature electronics;and smart actuators and sensors. A review of the technologies and approaches that highlights the need to change the Full Authority Digital Engine controller (FADEC) architecture is presented.

关键词： Gas turbines

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The use of simulation in the design of modern gas turbine control systems

The use of simulation in the design of modern gas turbine co...

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iee colloquium on Integrated Systems in Aerospace (Digest No: 1997/015)

作者： M. Kirkman Lucas Aerospace Limited USA

As gas turbine controls become increasingly complex and development timescales get shorter,the need for systems to work right first time becomes more and more important. A major part of "proving" systems before they fly is by use of simulations which demonstrate the performance and safety features required and, in line with the systems being simulated, these too are becoming ever more complex. Lucas Aerospace has been an engine component supplier, providing pumps, fuel metering units and electronic units for a wide range of aero gas turbines. Simulation has been performed at component level, modelling the pressures, forces and flows relating to a particular valve, for instance. The development of more complex simulations was limited by computing power and the availability of suitable tools. Lucas now concentrates on high value added systems supply. This move from a component to a systems supplier involves not just the components but also the interfaces between the hydromechanics, electronics, control laws and sensors, as well as the pilot and engine interfaces. The use of simulation has become more important in developing systems in which the component elements interact in a sensible and safe manner. As computing power continues to increase and more and better tools become available, the level of simulation complexity increases. This paper discusses how various simulation techniques and tools are being used to aid the design of control systems for modern aeroengine gas turbines.

关键词： Gas turbines

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Proceedings of the 1996 iee colloquium on Mass Storage Systems

Proceedings of the 1996 IEE Colloquium on Mass Storage Syste...

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Proceedings of the 1996 iee colloquium on Mass Storage Systems

Journal publishes the materials of the colloquium in computing and control division 'Mass Storage Systems'. The Proceedings contains 5 papers. Special attention of the colloquium is paid to the problems of mass multimedia storage systems, mass storage of maps and documents, design of tape cartridge unit mass storage, high performance tape storage and DTL tape drives technology.

关键词： Digital storage

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iee computing and control division colloquium on Applications of advanced PLC (Programmable Logic controller) Systems with Specific Experiences from Water Treatment

IEE Computing and Control Division Colloquium on Application...

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iee computing and control division colloquium on Applications of advanced PLC (Programmable Logic controller) Systems with Specific Experiences from Water Treatment

The proceedings contains 6 papers on the application of advanced programmable logic controllers (PLCs) with specific experiences from water treatment. Topics discussed include fully automated waterworks, chlorination control in large treatment works, PLC application as a cell controller using a communication network, sequential fluid power system condition monitoring using PLCs, and the use of PLCs to control rapid gravity filter operations.

关键词： Programmable logic controllers

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