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检索条件"主题词=Computer algorithms"

共 3273 条记录，以下是3251-3260 订阅

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PRIMARY FREQUENCY RESPONSE IN THE GREAT BRITAIN POWER SYSTEM FROM DYNAMICALLY CONTROLLED REFRIGERATORS 22nd

PRIMARY FREQUENCY RESPONSE IN THE GREAT BRITAIN POWER SYSTEM...

引用

International Conference and Exhibition on Electricity Distribution

作者： Meng Cheng Jianzhong Wu Janaka Ekanayake Toby Coleman William Hung Nick Jenkins Cardiff Univ. Cardiff UK|c|

ISBN: (纸本)9781629931333

Primary frequency response from dynamically controlled refrigerators was investigated. A control algorithm was applied to a model of refrigerators to regulate their power consumption according to the deviation of system frequency. A model of a population of refrigerators equipped with such control was implemented in PowerFactory. A simplified Great Britain (GB) power system model was used to investigate primary frequency response from the refrigerators. Simulation results show that the refrigerators react effectively to the frequency variations by varying their power consumption.

关键词： Frequency variation Great Britain system frequency computer algorithms Power consumption refrigerator frequency response

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Implementation of an Asymmetric Relay Autotuner in a Sequential Control Language

Implementation of an Asymmetric Relay Autotuner in a Sequent...

引用

IEEE International Conference on Automation Science and Engineering

作者： Alfred Theorin Josefin Berner Department of Automatic Control Lund University

ISBN: (纸本)9781467381840

Control applications contain both logic, sequencing, and control algorithms. A holistic view of this is seldom presented in teaching and papers. One reason is the separation of communities - automation groups typically come from the Programmable Logic Controller (PLC) world while control engineers primarily come from the Distributed Control System (DCS) world. Both logic, sequencing, and control algorithms are, however, well integrated in today's control systems since DCS systems now contain logic and sequencing and PLCs now contain control algorithms. This paper shows that both logic, sequencing, and control algorithms can be integrated seamlessly in a sequential control language. The particular application considered is a PID controller with a relay autotuner. The presented autotuner implementation yields good controller parameters and is freely available.

关键词： computer algorithms sequential control Formal logic Proportional Integral Derivative Control relay Analyses, Sequence COMMAND AND CONTROL LANGUAGES Programmable logic controllers control engineering Language DC SYSTEMS Sequencing

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Hierarchical Control of Combined Power Control Resources Mitigating Local Power Grid Fluctuations

Hierarchical Control of Combined Power Control Resources Mit...

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International Conference on Information, Communication and Automation Technologies

作者： Cedric Bodet Anett Schulke NEC Laboratories Europe NEC Europe Ltd.

ISBN: (纸本)9781479904297

Power grid fluctuations are an increasing concern with the high penetration of intermittent generation sources. This paper describes a hierarchical control scheme defined by the dynamics of de-coupled power units over possibly different business domains into an integrated control scheme providing fluctuation mitigation. Specifically, a method built on the combination of charging control of a variable EV fleet and a small-scale energy storage system in a prioritized control hierarchy is investigated with its impacts on both domains. The control hierarchy uses the EV charging dynamics as prime resource for the mitigation of local generation fluctuations and accommodates the residual lack with local electric storage. The definition of a controllable power range for the charging stations allows for the EV charging infrastructure to serve as a power service. The underlying two-layer control algorithms is evaluated through simulations of the dynamics of a residential grid segment combining different grid resources. The results show significantly enhanced performance for effectively reducing the energy surplus-needs through the prime control layer (here: EV charging), but also the need for careful design of secondary power capacities (here: storage).

关键词： stepping controls control hierarchy Electric vehicles Power grids CHARGING(ACCOUNTTNG) charging computer algorithms dynamics combined dynamic battery energy storage system THERMAL ENERGY STORAGE SYSTEMS flywheel energy storage system fluctuations

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Control of High-speed Permanent Magnet Synchronous Machine

Control of High-speed Permanent Magnet Synchronous Machine

引用

Annual Conference on IEEE Industrial Electronics Society

作者： Jan Chysky Jaroslav Novak Martin Novak Czech Technical University in Prague Faculty of Mechanical Engineering Department of Instrumentation and Control Engineering

ISBN: (纸本)9781467324199

This paper presents results of the control algorithm development for vector control of permanent magnet synchronous machine realised on DSP TMS320F2812. Results of experiments and project of new control unit based on FPGA are presented. The setup was tested with permanent magnet motor up to 42000 RPM, nominal torque 1.2 Nm and nominal current 11 A.

关键词： Permanent magnet synchronous machines computer algorithms control unit Vector control Pest Control Standing Orders Field programmable gate arrays Nominal

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Digital Adaptive Driving Strategies for High-Voltage IGBTs

Digital Adaptive Driving Strategies for High-Voltage IGBTs

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2011 IEEE Energy Conversion Congress and Exposition (ECCE 2011)

作者： Lan Dang Harald Kuhn Axel Mertens Institute for Drive Systems and Power Electronics Leibniz University Hannover D-30167 Welfengarten 1 Hannover Germany

ISBN: (纸本)9781457705427;9781457705410

Digital technology incorporated into the gate drive unit of HV-IGBTs allows new features, like automatic optimization of the gate current waveforms for achieving certain properties of the switching transients, or automatic adaptation to the operating conditions. This paper presents a digital gate unit with on-line measurement of the IGBT's switching waveforms. Based on this, a robust control algorithm is developed to adapt the gate current waveforms to the desired switching behavior, irrespective of the operating conditions. The algorithm is implemented in a Field-Programmable Gate Array (FPGA) on the gate unit and experimentally verified for several optimization objectives using 3.3 kV and 1200 A IGBTs.

关键词： insulated gate bipolar transistors gate current DRIVES High Voltage waveforms adaptive optimization DIGITAL TECHNIQUES Field programmable gate arrays gates computer algorithms

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Two-Phase Interleaved Buck Converter with a new Digital Self-Oscillating Modulator

Two-Phase Interleaved Buck Converter with a new Digital Self...

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International Conference on Power Electronics

作者： Lars T. Jakobsen Michael A. E. Andersen Technical University of Denmark Oersted-Automation

ISBN: (纸本)9781424418718

This paper presents a new Digital Self-Oscillating Modulator (DiSOM) for DC/DC converters. The DiSOM modulator alllows the digital control algorithm to sample the output voltage at a sampling frequency higher than the converter switching frequency. This enables higher control loop bandwidth than for traditional digital PWM modulators given a certain switching frequency. A synchronised version of the DiSOM modulator is derived for interleaved converters. A prototype interleaved Buck converter for Point of Load applications has been designed and built to test the performance of DiSOM modulator. The DiSOM modulator and a digital control algorithm have been implemented in an FPGA. Experimental results show that the converter has a very fast transient response when a loadstep is applied to the output. For a loadstep of 50% of nominal output current the output voltage overshoot is less than 2.5% of the nominal output voltage and the settling time is just 8 switching periods.

关键词： output voltage Modulators Converters step-down converter computer algorithms nominal output setting time TRANSIENT RESPONSE Switching frequency

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Local Independent Control of Cognitive Radio Networks

Local Independent Control of Cognitive Radio Networks

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3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)

作者： Christian Doerr Dirk Grunwald Douglas C. Sicker Department of Computer Science University of Colorado Boulder CO USA

ISBN: (纸本)9781424423019

Many different algorithms for managing cognitive radio networks have been proposed. While these algorithms have applied the whole range from centrally managed to distributed control schemes, a common feature of previous work is the reliance on explicit communication to exchange and negotiate configuration information. This paper describes a new class of cognitive radio control algorithms employing local independent control based upon swarming behavior found in nature. We examine the feasibility of such local independent control in a testbed implementation of the algorithm, configuring and dynamically adapting a cognitive radio network. We find that approach is suited to coordinate a cognitive radio network based on passive observation of its environment only and may coordinate with other control algorithms deployed in heterogeneous secondary user networks.

关键词： Cognitive radio Radio networks independent control computer algorithms Swarming behavior algorithms FULL-SCALE Reliance resin cement New classes Online resources

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Programmable Logic Controller based Embedded Quadratic Programming for input-constrained Internal Model Control

Programmable Logic Controller based Embedded Quadratic Progr...

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European Control Conference

作者： Ambrose. A. Adegbege Eric Mauro Department of Electrical and Computer Engineering The College of New Jersey

ISBN: (纸本)9781467371605

Advanced control algorithms such as optimization-based controls are known to offer superior performance as well as systematic constraints handling when compared to classical control strategies. However, the complexity of such advanced control methods makes their implementations difficult, especially on controllers with limited computational capacity such as the programmable logic controllers (PLC). This paper presents the capability of a low-cost low-end PLC for online computation of advanced control. In particular, an online quadratic program within the framework of input-constrained internal model control is implemented, and the effectiveness is illustrated using a hardware-in-the-loop experiment.

关键词： Programmable logic controllers logic controller quadratic programming Advanced controls Model control internal model control computer algorithms Control Methods PROGRAMMABLE Controllers

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Implementation Guidelines for Closed Loop Control algorithms on PLCs

Implementation Guidelines for Closed Loop Control Algorithms...

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IEEE International Conference on Industrial Technology

作者： Reinhard Hametner Georg Schitter Andreas Voigt Alois Zoitl Automation and Control Institute Vienna University of Technology Gusshausstrasse 27-29/E376 1040 Vienna Austria VOIGT+WIPP Engineers GmbH Marzstrasse 120 1150 Vienna Austria fortiss GmbH Guerickestrasse 25 80805 Munchen Germany

ISBN: (纸本)9781467345675

The integration of closed loop control algorithms into industrial control systems represents an important topic in the automation domain. Timing constraints have to be taken into account, often leading to a compromise between real-time capabilities of the control and accuracy of the calculated values. Due to its event-based execution model, IEC 61499 bears advantages concerning the closed loop control application implementation. This provides flexibility and allows the implementation of various and more sophisticated feedback algorithms. The work described in this paper is concerned with these different implementation aspects. A detailed analysis is presented concerning their timing characteristics and solutions are proposed for the actual realization of these design variants by applying IEC 61499 function blocks.

关键词： Automatic control systems development Industrial automation systems IEC 61499 Industrial automation systems Programmable logic controllers computer algorithms Industrial control systems Loops Contraceptive Coil International Electrotechnical Commission

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Data Center Transport Mechanisms: Congestion Control Theory and IEEE Standardization

Data Center Transport Mechanisms: Congestion Control Theory ...

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Annual Allerton Conference on Communication, Control, and Computing

作者： Mohammad Alizadeh Berk Atikoglu Abdul Kabbani Ashvin Lakshmikantha Rong Pan Balaji Prabhakar Mick Seaman Department of Electrical Engineering Stanford University Department of Computer Science Stanford University Broadcom Corporation San Jose Cisco Systems San Jose Departments of Electrical Engineering and Computer Science Stanford University Security Task Group

ISBN: (纸本)9781424429257

Data Center Networks present a novel, unique and rich environment for algorithm development and deployment. Projects are underway in the IEEE 802.1 standards body, especially in the Data Center Bridging Task Group, to define new switched Ethernet functions for data center use. One such project is IEEE 802.1Qau, the Congestion Notification project, whose aim is to develop an Ethernet congestion control algorithm for hardware implementation. A major contribution of this paper is the description and analysis of the congestion control algorithm-QCN, for Quantized Congestion Notification - which has been developed for this purpose. A second contribution of the paper is an articulation of the Averaging Principle: a simple method for making congestion control loops stable in the face of increasing lags. This contrasts with two well-known methods of stabilizing control loops as lags increase;namely, (i) increasing the order of the system by sensing and feeding back higher-order derivatives of the state, and (ii) determining the lag and then choosing appropriate loop gains. Both methods have been applied in the congestion control literature to obtain stable algorithms for high bandwidth-delay product paths in the Internet. However, these methods are either undesirable or infeasible in the Ethernet context The Averaging Principle provides a simple alternative, one which we are able to theoretically characterize.

关键词： data center control ring INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS Instruction repertory computer algorithms Joints Control Theory Ethernet networks notification closed-loop gain

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