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检索条件"主题词=Computer algorithms"

共 3297 条记录，以下是1771-1780 订阅

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Smart Impedance Application on Unbalanced Harmonic Mitigation in Three-Phase Four-Wire Systems

Smart Impedance Application on Unbalanced Harmonic Mitigatio...

引用

IEEE Energy Conversion Congress and Exposition

作者： R. B. Gonzatti S.C. Ferreira C. H. da Silva L.E.B da Silva G. Lambert-Torres L. G. Fernandez Silva Federal University of Itajuba - UNIFEI CPFL Energy

ISBN: (纸本)9781479903375

This paper describes the newest hybrid active filter topology, the Smart Impedance, under unbalanced harmonic mitigation in three-phase four-wire systems. A three-phase modular approach permits the selective compensation of unbalanced harmonic components, no matter the current imbalance level or the harmonic sequence components flowing through the line. The Smart Impedance effectiveness highlights its capability of mitigating harmonics from voltage-source or current-source nonlinear loads emerging as an option to Parallel Active Filter or Parallel Passive Filter and classical hybrid active filter. The control algorithm is based on Proportional Resonant Controller. Practical results demonstrate the effectiveness of the Smart Impedance topology under unbalanced and different load conditions.

关键词： three-phase four-wire impedance computer algorithms hybrid active filter voltage source variable amplitude loading Harmonic sequence

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Optimal Control of a Grid-Connected Hybrid Electrical Energy Storage System for Homes 13

Optimal Control of a Grid-Connected Hybrid Electrical Energy...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Yanzhi Wang Xue Lin Massoud Pedram Sangyoung Park Naehyuck Chang University of Southern California Los Angeles CA USA 90089 Seoul National University Seoul Korea 151-744

ISBN: (纸本)9781467350716

Integrating residential photovoltaic (PV) power generation and electrical energy storage (EES) systems into the Smart Grid is an effective way of utilizing renewable power and reducing the consumption of fossil fuels. This has become a particularly interesting problem with the introduction of dynamic electricity energy pricing models since electricity consumers can use their PV-based energy generation and EES systems for peak shaving on their power demand profile from the grid, and thereby, minimize their electricity bill. Due to the characteristics of a realistic electricity price function and the energy storage capacity limitation, the control algorithm for a residential EES system should accurately account for various energy loss components during operation. Hybrid electrical energy storage (HEES) systems are proposed to exploit the strengths of each type of EES element and hide its weaknesses so as to achieve a combination of performance metrics that is superior to those of any of its individual EES components. This paper introduces the problem of how best to utilize a HEES system for a residential Smart Grid user equipped with PV power generation facilities. The optimal control algorithm for the HEES system is developed, which aims at minimization of the total electricity cost over a billing period under a general electricity energy price function. The proposed algorithm is based on dynamic programming and has polynomial time complexity. Experimental results demonstrate that the proposed HEES system and optimal control algorithm achieves 73.9% average profit enhancement over baseline homogeneous EES systems.

关键词： hybrid electrical energy storage system smart grid optimal control Smart grids Optimal control computer algorithms Power production Cache Memory System Homes electrical energy Electricity electricity(energy)

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Human Like Learning Algorithm for Simultaneous Force Control and Haptic Identification

Human Like Learning Algorithm for Simultaneous Force Control...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Chenguang Yang Zhijun Li Etienne Burdet School of Computing and Mathematics University of Plymouth UK Key Laboratory of Autonomous Sysems and Netowked Control Ministry of Education Guangzhou 510640 China Department of Bioengineering Imperial College of Science Technology and Medicine London UK

ISBN: (纸本)9781467363563

This paper develops a learning control algorithm adapting the reference point and force to interact with an object of unknown geometry and elasticity. The controller is inspired by neuroscience studies that investigated the neural mechanisms when human adapt to virtual objects of different properties. The learning control algorithm estimates the shape and stiffness of the given object while maintaining a specified contact force with the environment. Simulations demonstrate the efficiency of the algorithm to identify the geometry and impedance of an unknown object without requiring force sensing. These properties are attractive for robotic haptic exploration with little demand on the sensing.

关键词： learning algorithms Force control computer algorithms reference station Human learning control CONTACT FORCE algorithm efficiency Neurosciences Neurophysiology algorithms geometry impedance

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Phase-Staggered Multiple ZVS Inverters For Grid-Connected PV Systems

Phase-Staggered Multiple ZVS Inverters For Grid-Connected PV...

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IEEE Energy Conversion Congress and Exposition

作者： Vidisha Gupta S. Ali Khajehoddin Praveen Jain Electrical and Computer Engineering Queen's University Kingston Canada Electrical and Computer Engineering University of Alberta Edmonton Canada

ISBN: (纸本)9781479903375

Power switches in many DC/AC inverter designs are hard switched, which generates EMI noise and losses in the inverter. A relatively low switching frequency may be used to increase the inverter efficiency;however, this imposes a compromise in the size of the inverter components. In this paper, switching losses have been minimized by incorporating Zero Voltage Switching (ZVS) in a full-bridge topology, at switch turn-on and an adaptive Variable Dead-time Control at switch turn-off. Since the soft switching technique is based on control algorithms, there is no additional cost and size involved with the use of any extra auxiliary circuits. Further, the size of the output filter is reduced without increasing the switching frequency, by connecting multiple grid-tied inverters in parallel. This interleaving technique also improves the quality of the current fed into the utility grid. The proposed method was implemented on a 250W micro-inverter prototype to validate the superior performance of the proposed concept and to compare the experimental results with those of the existing methods of soft switching.

关键词： Inventors output filter electro magnetic interference noise soft switching Softswitch Switching frequency computer algorithms

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A Comparative Analysis of Direct Power Control algorithms for Three-Phase Power Inverters

A Comparative Analysis of Direct Power Control Algorithms fo...

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IEEE Power and Energy Society General Meeting

作者： Nasser Mendoza Jhon Pardo María Mantilla Johann Petit Grupo de Investigación en Sistemas de Energía Eléctrica (GISEL) Universidad Industrial de Santander (UIS) Bucaramanga Colombia

ISBN: (纸本)9781479913022

This paper presents a comparative analysis between three control techniques based on the Direct Power Control (DPC) algorithm for grid-tied Voltage Source Inverters (VSI). These techniques are used to regulate the injection of instantaneous active and reactive powers in a power system for renewable generation system applications. The first technique corresponds to the Classical DPC (C-DPC) and it is based on the definition of a Virtual Flux (VF). In the second one, the instantaneous active and reactive powers are estimated by using the time derivatives of the injected currents, without any voltage sensors. The third algorithm uses the Space Vector Modulation (SVM) technique to generate additional space vectors and it considers the minimum square error of the instantaneous active and reactive powers to determine the switching states. Simulation results of the three control techniques are presented and their performance is compared based on some criteria such as maximum steadystate power error, the current total harmonic distortion and the rise time.

关键词： Direct Analysis Comparative Reactive power computer algorithms quadratic errors Mentoring direct power PULSE RISE TIME voltage source inverter three-phase power power systems Analysis time derivative Control technology Inventors

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Efficient Single Phase Harmonics Elimination Method for Microgrids Operating in Grid Connected or Standalone Mode

Efficient Single Phase Harmonics Elimination Method for Micr...

引用

IEEE Energy Conversion Congress and Exposition

作者： Saeed Anwar Ali Elrayyah Yilmaz Sozer Department of Electrical and Computer Engineering The University of Akron

ISBN: (纸本)9781479903375

A strategy to eliminate harmonics from the grid current as well as the voltage of the point of common coupling (PCC) for microgrid applications is presented in this paper. The position of the harmonics reduction unit is selected so that it can reduce the harmonics level of the grid current and PCC voltage harmonics irrespective of the distribution of the renewable energy sources in microgrid. The proposed compensation system can be operated in both grid connected and islanded microgrid system without changing any configuration. In the proposed control algorithm, the required amount of attenuation for the harmonics is determined to meet the THD requirement specified by IEEE 519. Fast and efficient algorithm for phase detection irrespective of the presence of harmonics has been utilized for the system. The effectiveness of proposed method is verified by simulation and experimental results.

关键词： harmonics MICRO-GRID grids Grid Harmonic reduction grid current Phase detection compensation system point of common coupling Renewable energy renewable energy sources efficient algorithm VOLTAGE computer algorithms PRIMARY COMPONENT COOLING

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T1DM Subject as a Time-delay System: Modeling and Adaptive Control

T1DM Subject as a Time-delay System: Modeling and Adaptive C...

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International Conference on Process Control

作者： Tomas Ludwig Ivan Ottinger Marian Tarnik Eva Miklovicova Institute of Control and Industrial Informatics Faculty of Electrical Engineering and Information Technology Slovak University of Technology in Bratislava

ISBN: (纸本)9781479909261

Type 1 Diabetes Mellitus (T1DM) subject model is presented in this paper. The model consists of two parts. A glucose and insulin plasma kinetics is inferred from a minimal model of glucose kinetics commonly used to analyze the results of an intravenous glucose tolerance test (IVGTT). A subcutaneous insulin and a subcutaneous glucose kinetics are modeled as a time-delay. A meal announcement information is considered as a measured disturbance signal and a disturbance model is also proposed. The presented model serves as a base for the design of an adaptive control algorithm for automatic normoglycemia maintaining in T1DM subject. The adaptive control algorithm is also briefly presented in the paper.

关键词： adaptive control Disturbance model Delay systems computer algorithms Intravenous Glucose Tolerance Test fundamental design Type 1 Diabetes Mellitus Kinetics Glucose Tolerance Test Blood Glucose Glucose

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The role of 2D linear systems theory in the design and experimental verification of iterative learning control algorithms

The role of 2D linear systems theory in the design and exper...

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Mediterranean Conference on Control & Automation

作者： Krzysztof Galkowski Eric Rogers Institute of Control and Computation Engineer- ing University of Zielona Gora Electronics and Computer Science University of Southampton

ISBN: (纸本)9781479909964

Iterative learning control algorithms are applicable to the many industrial processes that complete the same finite duration task over and over again. One example is a gantry robot executing a pick and place operation in synchronization with a moving conveyor. The novel feature of these algorithms is the use of information from previous executions to update the control input for application on the next one. Iterative learning control has a 2D systems structure and this paper will give an overview of recent progress on the design of iterative learning control laws in this setting. A particular focus will be on the relative merits of this approach over alternatives and also experimental verification. Open research questions will also be discussed.

关键词： gantry robot control input computer algorithms Verification Linear system Industrial processes PICK algorithms Systems Theory Moving

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Finite Element Based Analytical Model for Controller Development of Switched Reluctance Machines

Finite Element Based Analytical Model for Controller Develop...

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IEEE Energy Conversion Congress and Exposition

作者： Rajib Mikail Iqbal Husain Mohammad Islam North Carolina State University Raleigh NC USA Nexteer Automotive Saginaw MI USA

ISBN: (纸本)9781479903375

This paper presents a novel method of modeling SRM including mutual coupling effect based on Finite Element Analysis (FEA). Once the machine geometry and design is completed in FEA, it is required to analyze the performance of the machine at different operating conditions with different control methods. Designing control algorithm with FEA in the loop is not convenient because of the complexity and simulation time involved. An analytical model performing similar to the FEA model and including the mutual coupling effect is desired during tuning of the control algorithm at different modes and variable speeds of operation. The self and mutual λ-i-θ characteristics of the machine can be derived from the FEA model and stored in a look-up table. A state space model based on the λ-i-θ characteristics of the machine is developed which can be readily coupled to any controller model. The method incorporates the mutual coupling effect which cannot be neglected for accurate modeling and good controller performance.

关键词： cross-coupling effect Finite element method Reluctance motors machine computer algorithms Variable speed ANALYSIS MODELS Controllers Control Methods switched reluctance machine State space models

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RFPT-based Adaptive Control of a Small Aeroplane Model

RFPT-based Adaptive Control of a Small Aeroplane Model

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IEEE International Conference on Intelligent Engineering Systems

作者： Krisztian Kosi Jozsef K. Tar Imre J. Rudas Doctoral School of Applied Informatics Obuda University Antal Bejczy Centre of Intelligent Robotics Obuda University

ISBN: (纸本)9781479908271

The realization of small, unmanned, automatic airplanes is a significant project at Obuda University. Essential results have been achieved regarding automatic take-off and navigation. Another important research field is development of design methods for adaptive controllers as alternatives to the Lyapunov function technique. For guaranteeing global stability this method means the realization of a complicated process that does not reveal subtle details of the trajectory tracking of the controlled system. These details depend on the numerous adaptive parameters of the Lyapunov function the optimal setting of which can be achieved e.g. by evolutionary techniques and ample numerical investigations. The suggested alternative primarily concentrated on these details and has only a few parameters. Without complementary parameter tuning only local stability can be achieved, but for a wide set of physical systems tuning only one of its parameters can maintain global stability. Our aim is to integrate these researches. The here presented results, i.e. that of simulation investigations on the "Robust Fixed Point Transformations (RFPT)" based control of the linearized model of a small airplane mean the first definite step in this direction. The convergence of the controller is stabilized by independent agents (model-independent observers) that are able to recognize whether the tuned control parameter approached the boundary of convergence and intervenes the tuning process accordingly. The expectation is the improvement of the already existing control algorithms.

关键词： Liapunov function overall buckling tuning adaptive controller local stability plane control parameter trajectory tracking computer algorithms AUTOMATIC Converge adaptive control

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