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检索条件"主题词=Computer algorithms"

共 3297 条记录，以下是1791-1800 订阅

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An Efficient Fixed-Point Realization of Inversion Based Repetitive Control

An Efficient Fixed-Point Realization of Inversion Based Repe...

引用

American Control Conference

作者： Herrick L. Chang Tsu-Chin Tsao graduate student of Mechanical and Aerospace Engineering University of California Los Angeles USA Mechanical and Aerospace Department University of California Los Angeles USA

ISBN: (纸本)9781479901777

The paper presents a fixed-point realization of non-minimum phase system inversion for inversion based control algorithms such as feedforward, repetitive controller, and iterative learning control. Based on the author's previous work on efficient dynamic inversion using stable pole-zero cancelation and non-minimum phase zero inversion using Kurosu filter, this paper employs the use of the Delta Operator filter realization to mitigate quantization effects in fixed-point computations. The Kurosu filter based inversion, where the difference of two IIR filters are used to approximate a high order FIR filter and switches are used to perform time reversals for phase compensation, is computationally efficient and well suited for low level fixed-point realization by digital signal processors or field programmable gate arrays. However, substantial quantization noise is evident in high sampling rate implementation. The Delta Operator realization increases computational complexity only slightly while providing substantial reduction of quantization noise. The method is employed in the feedforward and repetitive control of a piezoelectric actuator and the experimental results are presented to demonstrate its effectiveness.

关键词： author's Delta experimental Inversion Fixed point Delta delta quantization noise Writers FEEDFORWARD Quantization phase compensation Infinite impulse response filters Digital signal processors Piezoelectric actuators Filters computer algorithms time reversal

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Guidance, Navigation, and Control of an Unmanned Hovercraft

Guidance, Navigation, and Control of an Unmanned Hovercraft

引用

Mediterranean Conference on Control & Automation

作者： Kilsoo Kim Young-Ki Lee Sehwan Oh David Moroniti Dimitri Mavris George J. Vachtsevanos Nikos Papamarkos George Georgoulas School of Aerospace Engineering Georgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Democritus University of Thrace KIC Laboratory Department of Informatics and Telecommunications Technology Technological Educational Institute of Epirus

ISBN: (纸本)9781479909964

This paper introduces a simulation and evaluation of guidance, navigation, and control algorithms applied to an autonomous hovercraft. A line-of-sight guidance law is adopted in conjunction with a neural network based adaptive dynamic inversion control scheme for the underactuated hovercraft following a prescribed path. The simulation result demonstrates that the guidance and control scheme can be effective in waypoint following of the underactuated hovercraft, especially, when external disturbances exist. It is also shown that the error signals are bounded using Lyapunov's direct method.

关键词： ERROR SIGNAL hovercraft Guidance Navigation and Control Standing Orders external disturbance Simulation results Guidance Neural network computer algorithms

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Power Management Strategy for DC Microgrid Interfaced to Distribution System based on Solid State Transformer

Power Management Strategy for DC Microgrid Interfaced to Dis...

引用

IEEE Energy Conversion Congress and Exposition

作者： Xunwei Yu Xu She Xijun Ni Gangyao Wang Alex Huang NC State University Raleigh NC US

ISBN: (纸本)9781479903375

A typical DC microgrid, which can be enabled by Solid State Transformer (SST), is investigated in this paper. One unidirectional DC/DC converter for photovoltaic (PV), one bidirectional DC/DC converters for battery, and a SST based on distribution system level, are included in the proposed DC microgrid system. In order to manage the system operation, a distributed power management strategy is proposed. In the proposed control algorithm, not only the DC microgrid system can interface to the distribution system, but each module in the system can be distributed based on its own characteristics. Experimental results verify that the proposed power management strategy can be applied to a DC microgrid stably and achieve good performance.

关键词： dispensing system MICRO-GRID Power management system Operating systems Transformer solid state computer algorithms system level Batteries

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Optimal Power and Workload Management for Green Data Centers with Thermal Storage

Optimal Power and Workload Management for Green Data Centers...

引用

IEEE Global Communications Conference

作者： Yuanxiong Guo Yanmin Gong Yuguang Fang Pramod P. Khargonekar Xiaojun Geng Dept. of Electrical and Computer Engineering University of Florida Dept. of Electrical and Computer Engineering University of West Florida

ISBN: (纸本)9781479913510

Reducing the carbon footprint of data centers is becoming a primary goal of large IT companies. Due to the intermittency and unpredictability of renewable energy sources such as wind and solar, it is quite challenging to utilize them in data centers. In this paper, we explore the opportunities offered by delay-tolerant workloads and thermal storage to facilitate the renewable energy integration in data centers and meanwhile, reduce the cost of using brown energy (i.e., energy from the utility grid). A stochastic optimization problem is formulated to tackle the stochastic renewable generation and workload arrival processes. Then, an online control algorithm based on the Lyapunov optimization approach is proposed to solve it. Simulation results based on the real-world traces show the effectiveness of the algorithm in practice.

关键词： Renewable energy Data center Thermal storage Lyapunov optimization Batch workloads data center heat storage Renewable energy Workload Energy sources computer algorithms

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Sliding mode control of a single-phase LCL full-bridge rectifier

Sliding mode control of a single-phase LCL full-bridge recti...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Domingo Biel Arnau Doria-Cerezo Enric Fossas Dept. Electronic Eng. and Inst. Industrial and Control Eng. Polytechnical University of Catalonia Dept. Electrical Eng. and Inst. Industrial and Control Eng. Polytechnical University of Catalonia Dept. Automatic Control and Inst. Industrial and Control Eng. Polytechnical University of Catalonia

ISBN: (纸本)9781479902255

This paper presents a dynamic analysis and the control design for a singe-phase full bridge rectifier with a LCL filter. The control algorithm is based on the sliding mode control techniques that provides good tracking performances and robustness against parameter variations. The control design also considers the connection to a non ideal power network with a grid impedance as well as higher harmonics components in the voltage. The control law has been tested in numerical simulations with satisfactory results (also in the case of non ideal power grid).

关键词： AC-DC power converters Rectifier Nonlinear control systems Sliding Mode Control Variable structure systems Rectifiers Nonlinear control systems bridge rectifier Power grids design control grid impedance computer algorithms control law

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Model Development for Real Time Optimal Control in Pipe Lines

Model Development for Real Time Optimal Control in Pipe Line...

引用

American Control Conference

作者： Boyun Wang April Warnock Anna G. Stefanopoulou Nikolaos D. Katopodes Department of Mechanical Engineering University of Michigan Ann Arbor MI 48105 USA Department of Civil and Environmental Engineering University of Michigan Ann Arbor MI 48105 USA

ISBN: (纸本)9781479901777

A model reference optimal control architecture for the real-time fluid control of eliminating a contaminant plume from a pipe system was introduced in an earlier paper [1]. The mathematical model for the contaminant flow, is now extended and parameterized based on computational fluid dynamic simulations of a two-dimensional (2D) channel. It is also shown, based on the computational fluid dynamics (CFD) simulations, that the 2D-based mathematical model can be used for three-dimensional (3D) pipe flow problem under certain constraints. Finally, we also derive a very simple control law of the flow rate in a boundary port that would remove a contaminant if the flow was a theoretical 2D flow. This simple control law can initialize the iterative process of computing the optimal flow based on a more complex model and real-time measurements. With the results in this article, the optimal control architecture can be tested in the real-time prototype experiments. Further improvements on the mathematical model and control algorithm can be made for real life pipe-line fluid control problems.

关键词： real-time mathematical contaminant Real time control law model design Iterative Process Piping systems pipeline Pollutant Optimal control Mathematical Model Flow Control Architecture Flow rates computer algorithms

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Adaptive Damping Power Take-Off Control for a Three-Body Wave Energy Converter

Adaptive Damping Power Take-Off Control for a Three-Body Wav...

引用

IEEE Energy Conversion Congress and Exposition

作者： Zhe Zhang Ted Brekken Ken Rhinefrank Al Schacher Joe Prudell Erik Hammagren Pukha Lenee-Bluhm School of Electrical Engineering and Computer Sci. Oregon State University Corvallis Oregon 97331 Columbia Power Technologies Inc. 4920A SW 3rd Street Corvallis OR 97333

ISBN: (纸本)9781479903375

The performance of the power take-off (PTO) system for a wave energy converter (WEC) depends largely on its control algorithm. This paper presents an adaptive damping control algorithm which improves power capture across a range of sea states. The comparison between this control algorithm and other active control approaches such as linear damping is presented. Short term wave elevation forecasting methods and wave period determination methods are also discussed as pre-requirements for this method. This research is conducted for a novel WEC, developed by Columbia Power Technologies (COLUMBIA POWER). All hydrodynamic models are validated with their 1:7 and 1:33 scale tests.

关键词： PTO WEC linear Power output Westinghouse Electric Corporation computer algorithms Linear Linear damping WAVE ENERGY CONVERTERS Power Standing Orders

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Reactive Power Scheduler for Voltage Regulation of Distributed Energy Systems

Reactive Power Scheduler for Voltage Regulation of Distribut...

引用

IEEE Energy Conversion Congress and Exposition

作者： Ali Safayet Iqbal Husain Yilmaz Sozer Electrical and Computer Engineering Department North Carolina State University Raleigh NC USA Electrical and Computer Engineering Department The University of Akron Akron OH USA

ISBN: (纸本)9781479903375

A new reactive power scheduler control algorithm for the distributed voltage regulation with PQ inverters is proposed in this research. An elegant approach to achieve voltage regulation in utility grid is proposed through appropriate control of the renewable energy systems. PQ inverter capable of producing the reactive power is used to either achieve local voltage regulation or produce the reactive power commanded from the outer voltage regulator in the upper hierarchy of the grid management system. The proposed PQ scheduler and PQ inverters will work harmoniously in the local substation with minimum communication interface. The proposed control techniques achieve efficient utilization of the PQ inverters with maximum efficiency. The proposed energy network and the control algorithms are modeled at the system level to verify the effectiveness of the proposed system architecture.

关键词： modeled proposed effectiveness Voltage regulation Reactive power computer algorithms scheduler program Inventors system level ENERGY SYSTEMS distributed energy system energy grid Building systems maximum efficiency

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Towards Coordinated Congestion Control and Load Balancing in Datacenter Networks

Towards Coordinated Congestion Control and Load Balancing in...

引用

IEEE Global Communications Conference

作者： Zhengwei Zhao Zhixiong Jiang Chunyang Lu Yushan Cai Jingping Bi Institute of Computing Technology Chinese Academy of Sciences Information Technology Center China National Petroleum Corporation

ISBN: (纸本)9781479913510

Today's data centers are facing extreme challenges in providing low latency and high throughput simultaneously for their applications. However, the fair sharing congestion control algorithms, together with the hash-based load balancing mechanisms, seriously impede the satisfaction of such requirements. In this paper, we use threshold-based signaling and marking schemes to seamlessly integrate load balancing with congestion control protocols. Through adaptive per-packet load balancing, we evenly split network traffic across multiple paths. Meanwhile, we adaptively react to ECN in the case of congestion, and prioritize flows according to their latency requirements. Using realistic data center workloads, we show that, compared to the state-of-the-art load balancing and TCP, our approach improves the application throughput and mean flow completion time by 30-50% and 40-80%, respectively.

关键词： Load balancing data center control protocol ECN (3beta,5alpha,17beta)-17-hydroxyestrane-3-carbonitrile computer algorithms Workload traffic network Tritolyl Phosphates tactical command post Packet

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Predictive Control of Converter Switches in a Multi-Terminal HVDC system

Predictive Control of Converter Switches in a Multi-Terminal...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Mohsen Vatani Morten Hovd Department of Engineering Cybernetics Norwegian University of Science and Technology

ISBN: (纸本)9781479902255

In this paper, the Finite Control Set Model Predictive Control (FSC-MPC) is used to control the multi-level neutral point clamped converter of each station in a four-terminal VSC-based Multi-Terminal HVDC system (MTDC). Three stations of MTDC are controlled to track desired reference power and one station is controlled to keep the DC side voltage in the desired value. The FCS-MPC controller is designed to keep a tradeoff between current tracking error, switching frequency and capacitor voltage balancing. The measurement and computation delay is considered by applying two steps ahead prediction in control algorithm. The validity of the proposed controller is confirmed by simulations.

关键词： Multi-terminal HVDC Finite Control Set MPC Neutral point clamped converters Optimization HVDC SYSTEMS Predictive control multiterminal Converters STATIONS computer algorithms tradeoffs DC side Switches

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